Stir Casting Research Papers - Academia.edu (original) (raw)

In the study; SiC reinforced (1-12 wt. %) aluminum matrix composites from waste beverage cans were fabricated by stir casting method. The effect of reinforcement ratio on the experimental density, hardness, the compressive and tensile strength of the composites was investigated. The crystal structures and microstructure of the composite materials were analyzed by X-ray diffraction (XRD) method and scanning electron microscopy (SEM). From the results, the hardness of composites increased from 70,81 HV (pure Al alloy) to 89,80 HV (for 9 wt. % SiC). The compressive and tensile strengths were performed as 763,69 MPa (for 5 wt. % SiC) and 201,79 MPa (for 1 wt. % SiC) compared with pure aluminum alloy (620,35 MPa and 154,71 MPa).

- by
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- Microstructure, Composite Materials, Aluminum, Silicon Carbide

Aluminium Metal matrix Composites (AMC) is being extensively used in various field of life, especially in aerospace and automotive industries, because of its good thermal stability and excellent specific strength. AMCs are well known for high strength to weight ratio and high temperature applications. Currently the main research activities are carried out using Al 6061 brake rotor for four wheelers. Only few research works are reported in the case of two wheeler brake rotors. But still Al 6061 brake rotor are not used in motorcycles perhaps due to heat treatment distortion of thin disc. As reported by Sadagopan et al [1] only brake pads wear out faster but their research study was not carried out extensively on brake pad wear. In the present study, wear behaviour of SiC particles reinforced with Aluminium Matrix composites have been investigated. Al 6061 discs were made with 10%, 15% and 20%SiC particles by stir casting and machined to fit as a disc in pin on disc tribometer. Using Taguchi Design of Experiments, the experiments were carried out with 4 factorials and 3 levels based on L9 orthogonal array and the results are discussed.

- by IAEME Publication
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- Al6061, Stir Casting, Silicon Carbide (SiC), Iaeme Ijaret

Aluminium Magnesium alloys reveals several specific and attractive properties that qualify them to be used in many
automotive and aeronautical applications. Aluminium matrix composites have good mechanical and physical properties, when
reinforced with flyash and Graphite particles. In the present work, the number of cast samples of Al6Mg /flyash/Graphite
composites was prepared by using stir casting followed by hot rolling. The percentage inclusions is fixed for 2%fly ash and
varied Graphite from 2 to 6wt%. The composites prepared with a stirring speed of 400 rpm and stir casted at 7400C. Wear
resistance is superior for higher percentage of reinforcement with increase in pull out of rolling. Higher weight percentage of
reinforcements with higher reduction results in shrinkage cavities and particle cracking during rolling

- by IJRASET Publication
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- Hybrid Composites, Stir Casting

— In Metal matrix composites, the Aluminium Matrix Composites are gaining increasing attention for applications in aerospace, defence and automobile industries. The purpose of the current Paper is therefore aimed at highlighting the focus of the current research scenario, in the field aluminium based hybrid composites, to explore the materials for automotive and aerospace applications; this is achieved with the help of stir casting technique. Stir casting is one of the novel methods to produce metal matrix composites with more uniform distribution of matrix and reinforcement constituents. This approach involves mechanical mixing of the reinforcement particulates/particles into a molten metal bath. A crucible is heated to malt aluminum metal, with a motor and blades is placed in the crucible that helps to get uniform molten metal. The reinforcement is poured into the crucible above the melt surface and at a controlled rate, to ensure a smooth and continuous feed. As the blades rotate at moderate speeds, it generates a uniform mixing of the reinforcement particles into the melts to produce homogenous composites. In this paper we discussed about construction and experimentation of stir casting setup for metal matrix composites.

In this work Hybrid Metal Matrix Composite have been developed using stir casting process for improving
the Wear Behavior at lower cost. The silicon carbide (SiC) as one of the reinforcement used with 3%
weight fraction and Alumina (Al2O3) as the major reinforcement in 3%,6%,9% &12% weight fraction. Al-
7075 has been considered as the matrix material .The low cost stir casting process has been used for the
development of the composite system. The matrix material was melted in electric furnace and the heat
treated reinforcement in the desired weight fraction have been added followed by constant stirring the melt.
The temperature of the melt held at 750°C. The pouring temperature was recorded which has relation to
quality of the casting. The cast specimens have been obtained in the form of cylindrical rod of 20mm
diameter and 200mm length for carrying out tribological tests. Microstructure analysis reveals the uniform
distribution of reinforcements in the aluminum matrix. The density of the composite increases with the
increase in weight fraction. The composite density found to lie in between the density range of matrix and
the reinforcement. The pin on disc wear test has been carried on all the samples at various speeds of
300,600,900 and 1200 rpm, varying load of 1kg, 2kg, 3kg & 4kg and varying sliding distances of 1km, 2km,
3km & 4km. These test reveals that the wear resistance increases with the increase in the reinforcement
weight fraction. The increase in the speed reduces the wear rate and wear rate increases in with increase
in sliding distance. The wear rate and coefficient of the composite reduces for higher volume fraction. The
addition of SiC apart from improving the wear rate reduces the noise and vibration at higher speed and
load condition. The overall tribological property increases due to addition of the two reinforcement.

- by Ashutosh Gupta
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- Mechanical Engineering, Design, Furnace, Stir Casting

— Metal Matrix Composites (MMC) have been broadly considered as an alternative for the engineering materials due to their tremendous mechanical properties like high strength to weight ratio, wear resistance, high specific modulus, stiffness, damping capacity etc. Metal matrix composites specially aluminium based metal matrix composites (AMC) are getting popular day by day due to their diverse applications such as aerospace, aircrafts, automobile parts, electronic parts, turbine blades, golf clubs etc. Over the years, AMC have several operational, non-operational and functional uses in numerous engineering fields due to their better performance, environmental and economic benefits. AMC have been widely used in transportation industries because of less noise, lower fuel consumption and lower aerial emissions. It is now accepted that in order to empower the AMC substitution for engineering materials and to make it wide spread, there is a fascinating need to redesign the whole engineering system to reduce weight and volume.

- by IJFRCSCE Journal and +1
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- Engineering, Electronic Engineering, Mechanical Engineering, Telecommunications Engineering

Metal matrix composites possess significantly improved mechanical properties like high specific strength, specific modulus, damping capacity and good wear resistance compared to a Unreinforced alloys. Among various discontinuous dispersoids used, fly ash is one of the most inexpensive and low density reinforcement available in large quantities as solid waste by product during combustion of coal in thermal power plants. E-glass is another reinforcement used in this composite to enhance some of the mechanical properties of Al-2024. It is therefore expected that the incorporation of E-glass and fly ash particles in aluminium alloy will promote yet another use of this low-cost and moderate strength by stir casting method. The present investigation has been focused on the tribological properties and parameters are optimized by Taguchi method. Finally it is also validating and analysed by ANOVA.

- by uday paliwal
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- Mechanical Engineering, Composites, Metal Matrix Composites, Stir Casting
- by Dr. Ranganathan
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- Engineering, Mechanical Engineering, Materials Science, Renewable Energy

Metal matrix composites (MMCs) have a potential for enhanced wear conflict in excess of the unreinforced aluminum alloy and are the most capable in achieving enhanced mechanical properties. In the present investigation, composites of Aluminum 6061(Al6061) matrix material is reinforced with micron size Silicon carbide (µSiC) reinforcement with 5, 10 and 15 weight percentages (wt.%) and nano size SiC (nSiC) with 0.5, 1.0 and 1.5 wt.% are fabricated by stir casting technique. The stir casted composites are further heat treated and the specimens are prepared as per ASTM standards to conduct hardness and wear tests. The fabricated and heat treated nano composites showed enhancement in hardness and wear resistance more than the micro composites. The microstructure of the worn out specimen are examined by scanning electron microscope. Taking into contemplation all the factors, it can be concluded that aluminum based composite with 1.0% by weight nano SiC reinforcement acquire superior wear resistance properties as compared to micro SiC reinforced aluminum metal matrix composites.

- by IAEME Publication
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- Hardness, Wear Test, Stir Casting, Aluminum Metal Matrix Composites

The Aluminium based Metal Matrix Composites (MMCs) are generating wide interest in aerospace, automobile, space, transportation and underwater applications. This is mainly due to its superior and tailorable properties such as light weight, low density, high hardness, high temperature resistance and corrosion resistance. The present research work is related to the fabrication of Al6061/SiCp MMC by a low cost stir casting technique. The MMCs plates are prepared by varying the weight percentage of SiCp from 5% to 15%. The microstructural investigation of the resulting as-cast composite structures has been carried out using Optical microscopy, X-ray diffraction (XRD) analysis and Wavelength dispersive X-ray fluorescence spectroscopy (WD-XRF). The 6061 Al alloy-SiCp composite microstructure shows excellent distribution of SiCp in to 6061Al alloy matrix. Moreover, XRD analysis reveals the uniform presence of SiC particles into matrix.

The paper presents the results of experimental investigation on mechanical properties, machining Characteristics & Surface Roughness of an Aluminum Metal Matrix Composite (Al/SiC). Composite is prepared by using stir casting technique. The influence of reinforcement ratios of 0, 4 and 8 wt. % of SiC on mechanical Properties is discussed. Machining of composite by using turning operation and its characteristics that influence the cutting force and surface roughness such as feed rate, depth of cut and cutting speed was studied. It was observed that increase of reinforcement element addition produced better mechanical properties. Experimental results revel that the cutting forces increases with increase in weight percentage and Flank wear and decreases with increase in the cutting speed. It was observed that the cutting speed, Flank wear and the feed rate at constant depth of cut affects the surface roughness during dry turning operation of cast MMCs. Taguchi L27 orthogonal array technique is considered with four factors i.e. Material, cutting speed, feed & artificially induced tool wear, each at 3 different levels, has been employed. The experimental results reveal that cutting speed is most influencing parameter when cutting force Fx is considered. Similarly when surface roughness is considered tool wear plays the most influencing factor.

Aluminium alloys are widely used in aerospace automobile industries due to their low density and good mechanical properties, better corrosion resistance and wear, low thermal coefficient of expansion as compared to convention metals and alloys. The main aim involved in the present work is focused on study of mechanical properties of Al7075 alloy composite having varying weight percentages of 3% - 6% of Silicon Carbide, Fly ash and Red mud were fabricated by liquid metallurgy (Stir Casting) method. The casted composite specimens were machined as per BS: 18: 1962 test standards. The result obtained reveals that tensile strength, impact strength and wear resistance is higher in Al7075-SiC-Redmud samples when compared to Al7075-SiC-Flyash samples.

The dynamic behavior of sandwich cantilever beam has not been extensively investigated, the application of cantilevers is found extensively in structural elements, supporting device for motors or engines and construction of bridges. Dynamic stresses will be induced on beams hence it is important to know the natural frequencies of beam-mass system. Present work involves comparison of dynamic behavior of aluminum and steel cantilever beam with sandwich beam of aluminum and steel both analytical and numerical analysis. The natural frequency calculated by using equations and it has been validated numerically and variation of 1 to 5 % noted difference between numerical and analytical analysis.

- by Mulatu Mengistayehu
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- Friction Stir Welding, Stir Casting, Nano Fabrication

Stir casting is an economical process for the fabrication of aluminum matrix composites. There are many parameters in this process, which affect the final microstructure and mechanical properties of the composites. In this study, micron-sized SiC particles were used as reinforcement to fabricate Al-3 wt% SiC composites at two casting temperatures (680 and 850 °C) and stirring periods (2 and 6 min). Factors of reaction at matrix/ceramic interface, porosity, ceramic incorporation, and agglomeration of the particles were evaluated by scanning electron microscope (SEM) and high-resolution transition electron microscope (HRTEM) studies. From microstructural characterizations , it is concluded that the shorter stirring period is required for ceramic incorporation to achieve metal/ce-ramic bonding at the interface. The higher stirring temperature (850 °C) also leads to improved ceramic incorporation. In some cases, shrinkage porosity and intensive formation of Al_4C_3 at the metal/ceramic interface are also observed. Finally, the mechanical properties of the composites were evaluated, and their relation with the corresponding microstructure and processing parameters of the composites was discussed.

- by Dermot Brabazon
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- Aerospace Engineering, Automotive Systems Engineering, Metallurgy, Metal Forming

Light weight metals like magnesium and its alloys are in more use these days in automotive & aerospace industries. Magnesium based hybrid structures which are combinations of magnesium and another material like Aluminium can offer optimal technical performance due to the favorable strength-weight ratio. Materials with improved tribological properties have become the pre-requisite of advanced engineering design. Metal matrix composites (MMCs) exhibit a unified combination of good tribological properties and high toughness of the interior bulk metal when compared with monolithic materials. Stir processing, a microstructure modification technique, has emerged as one of the processes used for fabrication of MMCs. Commercial cast or wrought type Mg-Al-Zn AZ-series alloys, such as AZ91 9 wt.% Al and 1 wt.% Zn, have been widely used in automobiles or electronic appliances. Tribological performance of the fabricated composite will be investigated using pin-on-disc wear & friction monitor. In this paper, a novel approach of making hybrid preforms with two types of reinforcements, i.e., lowcost and different sized particles, for magnesium-based composites is planned. This paper investigates the wear behavior of magnesium alloy (similar to commercially available AZ91) based metal-matrix composites (MMCs) reinforced with Silicon Carbide (SiC) & Aluminium oxide (Al2O3) particulates during dry/wet sliding.

- by IAEME Publication
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- Al6061, Stir Casting, Silicon Carbide (SiC), Iaeme Ijaret
- by Editor IJRET
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- Mechanical Engineering, Materials Science, Metal Matrix Composites, SIC

This paper presents a summary of work reported on Aluminium metal matrix composites with different reinforcements. Aluminium metal matrix has growing demand in aircraft, automotive and other industries due to its light weight, high strength to weight ratio, corrosion resistance and workability. The work is done by reviewed of research Papers, Articles, Magazines, references books etc. The present work focus on mechanical properties and surface texture of aluminum matrix composites AMCs reinforced by silicon carbide, fly ash, TiO2, graphene and B4C and with different wt by using stir casting technique. Each reinforced material has an individual property which when added improves the properties of the base alloy. Effect of different reinforcement on AMCs on the microstructure analyses and mechanical properties like tensile strength, hardness, density, electrical resistivity and wear behaviour is also discussed in detail. Major applications of different AMCs are also highlighted in thi...

- by sk dhakad
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- Mechanical Engineering, Materials Science, Reinforcement, Characterization

The popularity of Aluminium matrix composites is drawn from the properties they possess; however, these mechanical properties are adversely affected by the presence of porosity. This paper provides a comprehensive insight into the concept of porosity, the major factors leading to occurrence of porosity in a cast composite and the effects that the porosity content has on the mechanical properties of the cast composites which ultimately affect the life and performance of the composite. Further it discusses the methods that can be adopted to minimize the occurrence of porosity. These methods are to be adopted in different stages of the casting process and each of the method has proved beneficial in the task of reducing the overall percentage of porosity in a cast aluminium matrix composite. These include variation in the casting techniques and processing parameters, alteration in the composition of the ingredient materials, the timing of the ingredient incorporation and the mode of ingredient incorporation.

- by Devinder Priyadarshi and +1
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- Stir Casting

- by Editor IJRET
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- Mechanical Engineering, Materials Science, Hybrid Composites, Wear resistance

Metal matrix composites are the resultant of combination of two or more elements or
compounds, possessing enhanced characteristics than the individual constituents present in them.
This paper deals with the fabrication of Al 2014-SiC composite and investigation of its
Microstructure and Mechanical properties. 2014 Aluminium alloy is characterized by good
hardness. It is selected as the base metal. The Silicon Carbide is characterized by good strength and
low density (3.21 g/cm3). It is chosen as the reinforcement. Silicon Carbide is coated with Nickel by
electroless method to increase its wettability and binding properties. The fabrication of metal matrix
composites is done by stir casting in a furnace, by introducing the required quantities of
reinforcement into molten Aluminium alloy. The reinforcement and alloy is mixed by means of
stirring, with the help of a stirrer. The base alloy and the composites are then tested for mechanical
properties such as tensile strength, flexural strength, impact strength and hardness. The fabricated
samples have higher tensile strength and impact strength than the alloy. Microstructure of the
samples, are analyzed using optical microscope.

- by Lakhan Rathod
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- Engineering, Mechanical Engineering, Materials Science, Technology

– Metal matrix composite are widely used in automotive industries because they exhibits different mechanical properties such as high strength and good wear resistance, high specific stiffness, low weight and high hardness etc. Due to these properties metal matrix composite with particulate reinforcement and fabricating method has become one of the most important areas of research. The work is mainly focus on fabrication of Al 6061 reinforced with 4% B4C (particle size 100 mesh) & 4% Cu and method used for fabrication is stir casting method. Tensile strength, hardness, impact strength, microstructure of fabricated composite are used to characterize it. By addition of B4C & Cu tensile strength and hardness of the fabricated composite has increased and slightly decreased in impact strength. Scanning Electron microscopy is used to confirm the microstructure and uniform distribution of B4C & Cu particles in metal matrix composite. The value of tensile strength increase up to 20% and hardness increase upto15% due to addition of B4C & Cu paritcles.The physical and mechanical properties of composite are improved so it can be used for automotive industrial applications. 1 INTRODUCTION When metal matrix composite (MMC's) compared with unreinforced metal they show high strength ,hardness ,impact strength as well as wear and fatigue strength at low and high temperatures so they are highly utilized designing of ground transportations vehicles, aircraft etc. Use of pure aluminum in designing industries is limited because it has poor mechanical properties and poor tribological properties also. The role played by the aluminum is vital in development of metal matrix composite reinforced with a B4C,SiC,TiC,Al2O3,TiC etc. they are commonly known as aluminum metal matrix composite (AMC's). Composition, mechanical behavior, response to heat treatment etc. are some common aspect to be considered corresponding to the metal matrix composite. Properties such as low weight, good corrosion resistance, and good mechanical properties such as tensile strength, hardness, toughness and impact resistance, fatigue etc. made aluminum use as matrix material. Some application require high melting point so aluminum also exhibits this property also .Boron carbide use in reinforcement due to it has good corrosion resistance , good thermal resistance, high strength, easily available, and good culpability with aluminum matrix. Boron carbide powder has very high cost and poor wetting characteristics so research work has been not enough due to these drawbacks. Boron carbide generally used for manufacturing of armor tanks, bullets proof vests etc. Hence, when boron carbide used with low cost routing technique is highly utilized for research purposes. Instead of using Sic carbide, the use of Cu the ductility of AMC's not reduce and it is low brittle as compare to the use of Sic

- by Ijariit Journal
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- Mechanical Engineering, Materials Science, Microstructure, Metal matrix composite
- by Adebisi Adetayo
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- Mechanical Engineering, Materials Science, Wear, Delamination
- by Editor IJRET
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- Engineering, Mechanical Engineering, Airborne Particulates, Taguchi method
- by SADINENI RAMA RAO
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- Mechanical Engineering, ANOVA, Electrochemical Machining, Material Removal Rate

Aluminium based composites has wide range of applications due to its excellent property combinations like improved mechanical properties, better wear and high corrosion resistance, ease to process and probably reduced production cost etc. The two or more phases combined together to form a composite one is base metal alloy and other is reinforcement ceramic. The most commonly used reinforcements are carbides, oxides and nitrides. A lot of research has taken place including carbide and oxide as reinforcement particles for aluminum matrix composites (AMCs). Researchers also incorporated flyash by-product of thermal power plant as reinforcement to prepare AMC's. Present work is focused on study of properties of composite developed with aluminium alloy (LM25) as matrix with reinforcement of silicon nitride and flyash. Samples are prepared by varying the %age of silicon nitride from 5% to20% increment of 5% and keeping the flyash content fixed at 5%. Stir casting method is utilized to prepare the samples. Tensile test, wear test, hardness test are done to analyze the mechanical properties of composite whereas SEM and optical microscopy is performed for characterization of AMC's. The results so obtained are correlated and compare with pure aluminium alloy. Results showed that hardness and wear resistance is more in the AMC having 20%wt of silicon nitride and 5% flyash. On the other hand tensile strength is more in sample having 15%wt of silicon nitride and 5% flyash. SEM and optical microscopy showed the homogeneous mixture of reinforcements in the aluminium alloy.

- by IJRASET Publication
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- Biodegradable polymer composites, Silicon Nitride, Flyash, Stir Casting

The consequence of sand and metal moulds on mechanical and microstructural characteristics of Aluminium Silicon Carbide (AlSiC) composite were studied. The composite material was prepared using a liquid-metallurgical technique via stir casting process. The aluminium ingot was melted in a tilting furnace of 5kg for 45 minutes at a temperature of 750ºC. Then 2.5% of silicon carbide (600 grit size) was added to the liquid metal, and to obtain homogeneous dispersion of silicon carbide, two stepwise mixing methods; mechanical and stir processes were applied. Then cast into sand and metal cast moulds respectively which were prepared earlier. The process was repeated for the other percentages of 5%, 7.5% and 10% for silicon carbide. The cast samples were allowed to be solidified and then machined into tensile, hardness and impact specimens according to their specifications. The results of the tests show that for materials which require high impact strength, metal cast process seems to be the best option to be used while for materials that require high hardness resistance, high modulus and high yield strength, the sand cast process should be used.

- by IAEME Publication
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- Mechanical properties, Grain Diameter, Aluminium, Stir Casting

The aluminium Al 6061 alloys are mainly used in the application of automobile and aeronautical industries. In the present investigation Al6061 alloy composites having varying weight percentages of (3% - 6%) Silicon Carbide, Fly ash and Red mud were fabricated by liquid metallurgical (Stir Casting) method. The casted composite specimens were machined as per BS: 18: 1962 test standards. The specimens were tested to know the mechanical properties such as tensile test, impact (Charpy) test and wear test. The result reveals higher tensile strength, impact strength and wears resistance in Al6061-SiC-Flyash samples when compared to Al6061-SiC-Redmud samples.

Metal matrix composites are the resultant of combination of two or more elements or compounds, possessing enhanced characteristics than the individual constituents present in them. This paper deals with the fabrication of Al 2014-SiC composite and investigation of its Microstructure and Mechanical properties. 2014 Aluminium alloy is characterized by good hardness. It is selected as the base metal. The Silicon Carbide is characterized by good strength and low density (3.21 g/cm3). It is chosen as the reinforcement. Silicon Carbide is coated with Nickel by electroless method to increase its wettability and binding properties. The fabrication of metal matrix composites is done by stir casting in a furnace, by introducing the required quantities of reinforcement into molten Aluminium alloy. The reinforcement and alloy is mixed by means of stirring, with the help of a stirrer. The base alloy and the composites are then tested for mechanical properties such as tensile strength, flexural s...

- by K.Shanmuga Sundaram
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- Engineering, Materials Science, Microstructure, Mechanical properties

The aim of work is to study influence of Sr or TiB addition to the microstructure and fluidity of Al-6%Si-0,7%Fe alloys on sand casting process. Al-6%Si-0,7%Fe were melted in crucible furnace at 730 0 C and added Sr or TiB. The fluidity of the molten metals were being measured by Birmingham method. The microstructure changes were studied by optical microscope. The results show that the addition of Sr in Al-6%Si-0,7%Fe alloy modify the morphology of the eutectic silicon phase from a coarse platelike structure to fine fibrous structure. The additional of TiB in Al-6%Si-0,7%Fe alloys result fine fibrous structure. The Addition Sr or TiB in Al-6%Si-0.7%Fe alloys decreases fluidity of the molten metals.

- by choirul aprilian
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- Stir Casting

Combining high specific strength with good corrosion resistance, metal matrix composites (MMCs) are materials that are attractive for a large range of engineering applications. Given the factors of reinforcement type, form, and quantity, which can be varied, in addition to matrix characteristics, the composites have a huge potential for being tailored for particular applications. One factor that, to date, has restricted the widespread use of MMCs has been their relatively high cost. This is mostly related to the expensive processing techniques used currently to produce high quality composites. In this paper, the relatively low cost stir casting technique is evaluated for use in the production of silicon carbide/aluminium alloy MMCs. The technical difficulties associated with attaining a uniform distribution of reinforcement, good wettability between substances, and a low porosity material are presented and discussed.

Aluminum alloys are widely used in aerospace and automobile industries due to their low density and good mechanical properties, better corrosion resistance and wear, low thermal coefficient of expansion as compared to conventional metals and alloys. The excellent mechanical properties of these materials and relatively low production cost make them a very attractive candidate for a variety of applications both from scientific and technological viewpoints. In the present investigations an attempt has been made on the study of performance characteristics of Al 6061 reinforcing with varying SiC content composite for varying process parameters. The composite is prepared by stir casting process in an electric melting furnace. The experimental study is performed varying weight % of Silicon carbide powder, pouring temperature and stirring time. The methodology based on orthogonal array Taguchi's analysis of variance (ANOVA) and signals to noise ratio (S/N Ratio) were employed to optimize the performance characteristics like Hardness and Surface roughness of developed Al 6061-SiC composite.

Aluminium is an abundant element of 8% on earthÃ¢â‚¬â„¢s crust and normally found in Aluminum oxide i.e. bauxite. In the present work the mechanical behavior of pure aluminium reinforced with Silicon Carbide and Rice Husk ash fabricated by liquid metallurgical (stir casting) method was investigated. The reinforcements were added in varying weight percentages of (3% - 6%). Tests were conducted for tensile test, impact test and hardness test. The results reveal that higher tensile strength with increase in rice husk content and higher impact strength & hardness of the hybrid composite with increased SiC content.

The present study deals with the investigation of wear behaviour of Al6061MMCs and its relation with Processing & microstructure. Al 6061 MMC composite containing different weight percentages of A l2O3 & keeping 2 weight % graphite constant have been fabricated using a Vortex method (stir casting method). A pin-on-disc wear testing tribometer was used to carry out the dry sliding wear tests on both Aluminum 6061 alloy composites and Aluminium 6061 monolithic alloy over a load range of 10-50N and sliding velocity of 1.88-5.65 m/s for various sliding distances of 1-3km. The SEM micrographs taken for the micro structure analysis of the reinforced composite specimens produced by casting show that the graphite and Al 2 O 3 particulates are uniformly distributed in the matrix. The SEM of wear surfaces showed that the large grooved regions and cavities with Al2O3 particles were found on the worn surface of the composite. Also worn surface of the Al 6061composite is rougher than unreinforced Al6061 alloy, this indicates an abrasive wear mechanism results due to presence of Al 2 O 3. Further, it was understood from the experimentation that the wear rate and coefficient of friction decreased linearly with increasing weight percentage of Al 2 O 3. The wear rate increase as the sliding speed increases. The best results of minimum wear have been obtained at 8% weight fraction of Al 2 O3

- by Dr. Suresh R.
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- aluminum MMCs, Stir Casting

Aluminium based composites offer high strength, stiffness and resistance to wear. The combination of properties produced on the surface makes hybrid composites attractive to a wide range of applications in Automotive and Aerospace industries. In this present study, Aluminium A356 Matrix Material is reinforced with different weight percentage (1wt%,2%wt,3%wt,4%wt) of Rice Husk Ash (RHA) and Titanium dioxide (Tio2) by stir casting technique. The hybrid composite was then tested for tensile strength and compression strength in Universal Testing Machine (UTM) in two cases of with heat treatment and without heat treatment. The test result showcases the improvement of the tensile and compressive strength of the hybrid composite material.

- by JASH MATHEW
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- Heat Treatment, TiO2, Stir Casting

The use of different kind of Metal-matrix composite materials is in constant growing over the years, because they have better physical, mechanical and tribological properties comparing to matrix materials. In automotive industry they are used for pistons, cylinders, engine blocks, brakes and power transfer system elements. Research attempts have been made in the past toreduce the cost of processing of composites, decrease the weight of the composites, and increase the desired performance characteristics. This paper presents the findings of an experimental investigation on the effects of applied load, RPM, Sliding distance and pin temperature in dry sliding wear studies performed on red mud-based aluminum metal matrix composites (MMC). Red mud is an industrial waste during the production of aluminum from bauxite ore. A pin-on-disc apparatus was used to conduct the dry sliding wear test. Taguchi-based L9 orthogonal array has been used to accomplish the objective of the experimental study. Analysis of variance (ANOVA) is employed to find the optimal setting and the effect of each parameter on wear rate.

- by IJSRD Journal
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- Taguchi, Red Mud, Stir Casting, Mmc
- by subhasini 12
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- Mechanical Engineering, Stir Casting

The present work deals with the microstructure and room temperature mechanical properties of pure magnesium and cast AZ80 nano-composites. Toward this end, different weight percent of SiC reinforcement nano-particles (1.5, 2.5 and 3.5) were added homogenously into the matrix employing stir casting method. It was found that the SiC nano-particles can reduce the grain size of magnesium matrices, significantly. The presence of nano-particles assisted in improving the hardness values. In addition, the tensile strength and the ductility values increased by increasing the SiC content. This was reasoned considering the occurrence of grain refinement, Orowan strengthening, coefficient thermal expansion mismatch of the matrix-particles, and the load bearing effect. However, there was an optimum SiC content beyond which the strength and formability of the materials were decreased. The latter was attributed to the agglomeration of SiC particles in the microstructure of the composites. In line to these findings, the compression tests results also indicated continuous improvement of ultimate compressive strength. The compressive stress-strain curves were also employed to study the work hardening behavior of the materials.

- by Hamid Reza Abedi
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- Nanocomposites, Mechanical properties, Magnesium Alloys, Stir Casting

Due to the demand for lightweight materials in the field of automobiles, aeronautics and some other application, there is a need to develop lightweight materials. For the last few decades, aluminum matrix composites are being developed in order to meet out the demand of the above-mentioned industries. aluminum the above, lightweight material in the form of composites of B4C reinforced in Al7075 alloy is considered for the present investigation. The composite was produced using the stir casting method. In this investigation, the micro and nano B4C particles were used as reinforcements. The fabricated composites were characterized for microstructure and mechanical properties. From the microstructural examination, it was observed that 12% of B4C nanocomposites was having fine microstructure as compared to others. The hardness and strength were found to be maximum for 12 % B4C nanocomposites which impact strength was lowest for 12% micro composites

- by IAEME Publication
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- UTS, Stir Casting, AL7075-T6 Alloy, B4Cp

The substantial use of aluminum reinforced with silicon carbide composites in various structural applications has led to the need of finding a efficient technical production techniques for these composites. Uniformity, machinability and intra-grain reactions of the constituents represent the most problems related to these composites. Production of uniform and strong components made from aluminum-silicon carbide composites can be achieved with the help of stir casting. Metal Matrix Composites (MMCs) have developed a high interest in modern times for potential applications in aeronautical and automobile industries. Achievement of a uniform distribution of reinforcement in the matrix is difficult and it has direct effect on the properties of the composite. Present thesis attempts to develop aluminum based silicon carbide particulate Metal Matrix Composites. Aluminum (Al2024) has been chosen as matrix and SiC (320-grit) as reinforcement material. Trials are done by changing the weight fraction of SiC (10% &15%), while other parameters are kept constant. An increase in hardness and strength has been observed with the increase in weight percentage of SiC. The results were further justified by comparing with other investigators.

- by Dr. Atul Kumar
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- Stir Casting

The aluminum matrix composites are extensively used in the numerous applications in the engineering owing to their due to high strength, excellent fatigue resistance; good machinability and surface finish capabilities. These light weight materials with high thermal conductivity are the right choice of the materialist for the wear resistant applications. The natural rutile mineral is used as reinforcement with the LM13, a piston alloy for the preparation of the composite. The wear studies have been carried out with the fine size rutile particles of range 50-75 µm with 20% wt. in the aluminium matrix with the variation in applied load. The wear track morphological studies were done using scanning electron microscope and wear debris analysis carried out with electron dispersive spectroscopy.

- by GJESR Journal and +1
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- Stir Casting, Synthetic Rutile
- by Editor IJRET
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- Microstructure, Metal matrix composite, Mechanical properties, Stir Casting

- by Devinder Priyadarshi
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- Stir Casting