Metal matrix composites: production by the stir casting method (original) (raw)
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Effect of Process Parameter of Stir Casting on Metal Matrix Composites
In the present study a modest attempt has been made to develop aluminum based silicon carbide particulate Metal Matrix Composites(MMC) with an objective to develop a conventional low cost method of producing MMCs and to obtain homogenous dispersion of ceramic material. Desired improvements in properties including specific strength, hardness and impact can be achieved by intelligently selecting the reinforcement materials, their size, and shape and volume fraction. It has been observed that melting and pouring conditions have directly or indirectly effect on mechanical properties of cast materials as hardness, percentage elongation, percentage reduction in diameter, toughness and so on. The knowledge of melting temperature of metals and alloys is necessary to estimate their corresponding pouring temperature.
FABRICATION OF METAL MATRIX COMPOSITE BY STIR CASTING METHOD 1 ME-Mech/CAD-CAM appearing
Several technical challenges exist with casting technology yet it can be used to overcome this problem. Achieving a uniform distribution of reinforcement within the matrix is one such challenge, which affects directly on the properties and quality of composite material .In the present study a modest attempt would be made to develop Aluminium based silicon carbide particulate MMCs with an objective to develop a conventional low cost method of producing MMCs and to obtain homogenous dispersion of ceramic material. To achieve these objectives two step-mixing method of stir casting technique has been proposed and subsequent property analysis has been made. Aluminium (98.41%) and SiC(320-grit) has been chosen as matrix and reinforcement material respectively. Experiments are planned for conducting varying weight fraction of SiC (in the steps of 5%) while keeping all other parameters constant. The results would be evaluated by Tests-Hardness, Impact (including micro-structure) for this 'development method'. The trend of hardness and impact strength with increase in weight percentage of SiC would be observed and recommendation made for the potential applications accordingly.
Review on Effect of Silicon Carbide (SiC) on Stir Cast Aluminium Metal Matrix Composites
The importance of composites as engineering materials is reflected by the fact that out of over 1600 engineering materials available in the market today more than 200 are composites. These composites initially replaced Cast Iron and Bronze alloys but owing to their poor wear and seizure resistance, they were subjected to many experiments and the wear behavior of these composites were explored to a maximum extent and were reported by number of research scholars for the past 25 years. In the present study, based on the literature review, the effect of Silicon carbide on Stir cast Aluminium Metal Matrix Composites is discussed. Aluminium Metal Matrix Composites with Silicon carbide particle reinforcements are finding increased applications in aerospace, automobile, space, underwater, and transportation applications. This is mainly due to improved mechanical and tribological properties like strong, stiff, abrasion and impact resistant, and is not easily corroded. In the present scenario, a review of different researchers have been made to consolidate some of the aspects of mechanical and wear behavior of Aluminium Metal Matrix Composites reinforced with Silicon carbide particles in both untreated and precipitation hardened condition.
Aluminum Silicon Carbide Particulate Metal Matrix Composite Development Via Stir Casting Processing
Silicon
In this paper, conventional simple methods of producing MMC with attained properties through the dispersion of silicon carbide in the matrix are investigated. To achieve these objectives a two-step mixing method of stir casting techn ique was employed. Alu minum (99.66 %C.P) and SiC (320 and 1200 gri ts) were chosen as matri x and rein forcement materi als respectively. Experiments were conducted by varyi ng the weight fr action of SiC fo r 2.5 %, 5.0 %. 7.5 % and 10 %. The result indicated that the st ir casting method was q uite successful to obtain uniform dispersion of reinforcement in the matrix. T his was evident by the improvement of properties of composites over the base metal. Re inforced Aluminum Silicon Carbide (ASC) showed an increase in Young's modu lus (E) and hardness above the unre info rced case and marginal reduction of e lectrical conductivity was recorded for the composites. T he silicon carbide of 1200 gnts (3 J.lm) showed increased Young's modulus (E) and hardness of 15 17.6 Mpa and 26. 1 Hv values at 7.5% volume fraction silicon carbide; when compared with the silicon carbide 320 grit (29 J.lm). ./ 0 S. I. Fayomi ojosu nda yf ayomi3@ gmai l.com, ojo. f ayom1 @covenantuniversi ty.edu. ng
A REVIEW PAPER ON STIR CASTING OF REINFORCED ALUMINUM METAL MATRIX COMPOSITE
The importance of composites as engineering materials is reflected by the fact that out of over 1600 engineering materials available in the market today more than 200 are composites. These composites initially replaced Cast Iron and Bronze alloys but owing to their poor wear and seizure resistance, they were subjected to many experiments and the wear behavior of these composites were explored to a maximum extent and were reported by number of research scholars for the past 25 years. In the present study, based on the literature review, the effect of Silicon carbide on Stir cast Aluminium Metal Matrix Composites is discussed. Aluminium Metal Matrix Composites with Silicon carbide particle reinforcements are finding increased applications in aerospace, automobile, space, underwater, and transportation applications. This is mainly due to improved mechanical and tribological properties like strong, stiff, abrasion and impact resistant, and is not easily corroded. In the present scenario, a review of different researchers have been made to consolidate some of the aspects of mechanical and wear behavior of Aluminium Metal Matrix Composites reinforced with Silicon carbide particles in both untreated and precipitation hardened condition.
Manufacturing and technological challenges in Stir casting of metal matrix composites– A Review
Materials Today: Proceedings, 2018
A "composite" is when two or more different materials are combined together to create a superior and unique material. This is an extremely broad definition that holds true for all composites, however, more recently the term "composite" describes reinforced plastics. This paper presents a study on the composites, production technologies related to metal matrix composites exclusively stir casting. Various processes of manufacturing metal matrix composites and how metal matrix composites are manufactured using stir casting process was discussed in this paper. Many processes like metal injection moulding ,friction stir process, mechanical alloying ,squeeze casting technology, continuous binder-powder coating etc. are used by the researchers for manufacturing metal matrix composites. Out of these processes stir casting process is very cost effective and simple. Researchers are doing lot of work in the field of production technologies of MMC which has brought down their cost to an acceptable level compared to those processed by powder metallurgy and spray casting process. Properties of these metal matrix composite materials depend upon many processing parameters of stir casting process like stirring temperature, stirring speed, stirring time, preheating time ,etc. and selection of matrix and reinforcements. This paper presents an overview of stir casting process, process parameter, & preparation of AMC material by using aluminium as matrix form and SiC, Al2O3 as reinforcement by varying proportion.
Evaluation of Mechanical Properties of Aluminum-Silicon Carbide Metal Matrix Composite
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
A composite is a fusion of two or more different material chemically and unsolvable phases, its properties and structural concert are greater the ingredients performing homogeneous phases. Ceramics and Metals as well, can be implanted with particles, to advances their Property of these mixtures are known as MMCs. The mutual reinforcement's effect on Aluminium Metal Matrix material with individual and multiple particulate reinforcements like Hybrid Metal matrix composites are finding better applications in field such as aerospace, marine, automotive, structural, underwater, and transportation and various other fields. It s fairly observed that the density of composite was decreased and the hardness was increased. Due to its versatile properties it is preferred for fabricating different types of metal matrix composites. Metal matrix composites exhibit better and improved strength, toughness, formability, corrosion resistance, machinability, stiffness, wear, creep, fatigue and numerous other mechanical properties as compared to metals The present investigation has been focused on the different combinations of the usage of reinforced materials as a reinforcing agent in different Aluminium matrix alloys in the processing of aluminium metal matrix composites by stir casting method.
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.
Practicalization of cast metal matrix composites (MMCCs)
Materials & Design, 2001
This article is an overview which briefly defines the main research points which have been considered towards the industrialization of cast metal matrix composites 'MMCCs'. Major issues in liquid processing are defined. This includes the identification of the major phases and the selection criteria and requirements for MMCCs, namely material design requirements, compatibility requirements, processing requirements and cost requirements. Also post-processing such as heat treatment, forming and machining, which can be operated on the MMCCs, are discussed. The modifications which can lead to commercial foundry technologies are also considered. Such modifications include those concerning melt preparation, holding and handling, degassing, gating system, molding techniques, and equipment modification and foundry layout. The efforts made by the international associations, for the standardization of MMCCs are overviewed. Finally, examples are given for the available practical MMCCs, either in the form of raw composite ingots or shape casting, and are evaluated. ᮊ
2015
Metal matrix composites (MMC’s) consist of a metallic matrix combined with dispersed particulate phases as reinforcement. Aluminium 6061 based metal matrix composite are used in the field of transportation, aviation and manufacturing of electrical equipments. Silicon carbide is used as reinforcement in aluminium matrix to get better functional properties.The stir casting method is employed for composite preparation. SiC of different weight percentage (5%, 7.5%, and 10%) is added as reinforcement to get MMC of variable compositions. The Stir cast producthas got dendritic segregation in the base metal matrix with nonuniformity in chemical composition, known as CORING. To overcome this problem generally homogenize annealing (homogenizing) treatment is given on the cast MMC. The hardness, strength, tensile strength and impact resistance characteristics are analyzed and compared with as-cast specimens.Homogenizing provides uniform chemical composition of the matrix in the microscopic lev...