IJERT-Preparation and Microstructural Characterization of ZrO2 Reinforced Al 6061 Metal Matrix Composites (original) (raw)
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Mechanical Characterization of Al 6061-Zircon Particulate Composites
Today composite materials gained popularity in their improved properties over the traditional materials, like low density, good thermal resistance , better corrosion resistance and surface finish. The Aluminium based metal matrix composites have the wide applications in Automotive and defence industries due to some good properties like strength to weight ratio, more wear resistance. In the present work Al6061 Alloy taken as the matrix alloy and zircon as the reinforcement , stir casting method was chosen to develop this composite. The melt composites in the graphite crucible were stirred by the mechanical stirrer and immediately it was poured to the cast iron moulds. Different samples of 0,3,6,9, and 12% of zircon were produced. Casted Samples were machined to ASTM standards. The Properties like tensile strength, impact strength ,Hardness and wear rate of the developed composites were investigated. For the 9% of reinforcement it has been observed a significant improvement in strength, hardness and reduction in the wear rate.
IRJET, 2022
Aluminum matrix composite is a new generation of metal matrix composite which have the tendency to meet the emerging for advanced engineering application. The performance of these materials mostly depends upon selecting right combinations of reinforcing materials. In the current work an effort as been made for the fabrication of Aluminum metal matrix composite for the investigation of its mechanical properties. The preparation of aluminum metal matrix composite is made by choosing AA6082 as matrix and by keeping weight % of reinforcements ZrO2 and the Ti are varied by 2%, 4% and 6%. The wear properties of metal matrix composites were studied by conducting wear test using pin on disc machine as per ASTM G-99 standard. The experiment were conducting by adopting the taquchi technique with an L9 orthogonal array and analysis of variance approach was employed to evaluate the effect wear parameters load, percentage reinforcement and duration on wear rate of composites. These samples were fabricated by means of stir casting technique and the micro structural characteristics of composites are studied by using optical microscope. Mechanical properties such as impact strength, hardness, compression are studied and compared the results with base Aluminum 6082 results.
Microstructure and Mechanical Behaviour of Al 6061-ZrB 2 In-situ Metal Matrix Composites
2016
Aluminium matrix composites processed through in-situ molten reaction has emerged as an alternative for eliminating defects existing in ex-situ reinforced metal matrix composites. Development of composites through in-situ method using inorganic salts via liquid metallurgy route is the most widely accepted technique. In the present work, Al6061-ZrB2 in-situ composites have been developed through in-situ reaction of Al-10%Zr and Al-3%B master alloys in Al6061 alloy. Study of microstructure and mechanical properties of in-situ reinforced ZrB2 in Al6061 alloy have been carried out. Composite exhibited grain refinement and improved the mechanical properties of Al6061 alloy. Ductility of composite is reduced with increase in content of ZrB2.
The present study deals with the evaluation of mechanical properties of aluminium alloy (Al6061) metal matrix composites reinforced with fused zirconia alumina (ZA-40) bonded abrasive particles which were fabricated by stir casting method. The sample specimens were prepared by varying the percentage of weight fraction of reinforced particles as 5,10,15 and the remaining aluminium alloy respectively. The mechanical properties were analysed. The evaluation of mechanical properties indicates variations in tensile strength, hardness and impact strength with respect to composite combinations. From the experimental studies, the optimum weight percentage of the matrix and reinforcement on the basis of mechanical properties was found to be 90 and 10 respectively.
IOP Conference Series: Materials Science and Engineering
Steel is used because of its high strength and toughness, but it has high density, therefore lighter material with comparable toughness is developed. One alternative is aluminum matrix composite with zirconia (ZrO 2) as the reinforcement with high fracture toughness. Al-9Zn-6Mg-3Si (wt. %) composites were developed with addition of 2.5, 5, and 7.5 vol. % ZrO 2 through squeeze casting. To improve toughness, the composite was solution treated at 450 o C for 1 h, then aged at 200 o C for 1 h. Materials characterization included Optical Emission Spectroscopy (OES), Rockwell B hardness testing, impact testing, fractography analysis, microstructure analysis using Optical microscope (OM) and Scanning Electron Microscope (SEM) / Energy Dispersive X-Ray Spectroscopy (EDS), as well as X-Ray Fluorescence (XRF). The results showed that the more ZrO 2 particles, the higher porosity and the lower the hardness and the impact values, both in as-cast condition and after ageing at 200 o C at 1 h.
Matéria (Rio de Janeiro), 2019
Zirconia (ZrO2) dispersed aluminum alloy metal matrix composites produced by stir casting techniques. Using stir casting techniques, aluminium based composites with varying amounts of 3%, 6%, 9%, and 12% of zirconia by weight are fabricated. The prepared samples were subjected to physical, mechanical,tribiology and microstructure investigation. The extraordinary performance of Aluminium MMCs was the low density that obtained after alloying. Hardness and ductility were also increased when increase in Zirconia particle. Ultimate tensile strength, compressive strength and impact toughness were slightly increasing with the addition of zirconia particle. Microstructural characteristics shows that a homogeneous distribution of particles with reinforcement in casted composite. The investigations of the metallurgical characterization were carried using optical, scanning electron microscope, X-ray diffraction and Energy Dispersive Spectrometry (EDS) test to understand the metallurgical prope...
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/preparation-characterization-and-mechanical-properties-of-al2o3-reinforced-6061al-particulate-mmcs https://www.ijert.org/research/preparation-characterization-and-mechanical-properties-of-al2o3-reinforced-6061al-particulate-mmcs-IJERTV1IS6175.pdf Aluminum MMCs are preferred to other conventional materials in the fields of aerospace, automotive and marine applications owing to their improved properties like high strength to weight ratio, good wear resistance etc. In the present work an attempt has been made to synthesize Al6061-Al 2 O 3 particulate metal matrix composites by liquid metallurgy route (stir casting technique). The addition level of reinforcement was 0, 6 and 9wt%. For each wt%, reinforcement particles were dispersed in steps of three into molten Al6061 alloy. Microstructural analysis was carried out for the above prepared composites to reveal distribution of particles. The prepared composites are subjected to the mechanical testing as per the ASTM standards. Microstructural characterization revealed fairly uniform distribution and some amount of grain refinement in the specimens. The Micro-Vickers hardness of the composite was found to increase with increase in filler content in the composite. The tensile strength of the composites was also found to increase confirming the enhancement of the mechanical properties.
Characterization of ZrC reinforced AA6061 alloy composites produced using stir casting process
Journal of Mechanical Science and Technology, 2020
In the present study, effect of ZrC vol.% on mechanical properties of AA6061 metal matrix composites (MMCs) produced via stir casting technique was investigated. The vol.% of ZrC particles was varied as 5,10 and 15. The composites were characterized for its microstructure and mechanical properties and their relationships were obtained. The scanning electron microscope (SEM) images revealed uniform distribution and good bonding between the AA6061 alloy and the ZrC particles. The mechanical properties of the AA6061 alloy was found to significantly improve with the addition of ZrC particles from 5 to 15 vol.%, the hardness increased from 32 to 68 HV, yield strength increased from 50 to 86 MPa and the ultimate tensile strength increased from 118 to 165 MPa. However, the % of elongation of the composite samples decreased with 15 vol.% addition of ZrC particles. Sliding wear behaviour of the composites was investigated using a pin-on-disc wear tester at a load of 9.8 N and addition of ZrC particles was significantly found to reduce the wear rate of AA6061 alloy.
Materials Today: Proceedings, 2023
This work explained about the hardness, density and tensile behavior of AMMCs and also recognizes the influence of Cr 3 C 2 into AA7075 under casting process on their mechanical properties. The composites are obtained through stir casting process with 2.5, 5 and 7.5 wt% of Cr 3 C 2. It is observed that the mechanical properties of the composites are increased with increasing weight percentage of reinforced material. The results are analyzed with optical micro structural images. The optimum hardness and tensile strength were observed at 5 wt% Cr 3 C 2 composite than other wt% of composites as well as monolithic base material.
Materials, 2013
Alumina-zirconia (AZ) composites are attractive structural materials, which combine the high hardness and Young's modulus of the alumina matrix with additional toughening effects, due to the zirconia dispersion. In this study, AZ composites containing different amounts of zirconia (in the range 5-20 vol %) were prepared by a wet chemical method, consisting on the surface coating of alumina powders by mixing them with zirconium salt aqueous solutions. After spray-drying, powders were calcined at 600 °C for 1 h. Green bodies were then prepared by two methods: uniaxial pressing of spray-dried granules and slip casting of slurries, obtained by re-dispersing the spray dried granulates. After pressureless sintering at 1500 °C for 1 h, the slip cast samples gave rise to fully dense materials, characterized by a quite homogeneous distribution of ZrO 2 grains in the alumina matrix. The microstructure, phase composition, tetragonal to monoclinic transformation behavior and mechanical properties were investigated and are here discussed as a function of the ZrO 2 content. The material containing 10 vol % ZrO 2 presented a relevant hardness and exhibited the maximum value of K I0 , mainly imputable to the t → m transformation at the crack tip.