Microstructural Studies of Aluminium 7075-Silicon Carbide-Alumina Metal Matrix Composite

2014 ◽  
Vol 984-985 ◽  
pp. 194-199 ◽  
Author(s):  
B. Rajeswari ◽  
K.S. Amirthagadeswaran ◽  
K. Ramya
Keyword(s):  
Silicon Carbide ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Stir Casting ◽  
Optical Microscope ◽  
Homogeneous Distribution ◽  
Modern Development ◽  
Al 7075 ◽  
Composite Samples

The modern development in the field of science and technology has created a demand for many advanced engineering materials. In recent days, aluminium related metal matrix composite is a probable material for many applications such as transport, aerospace, marine and automobile applications. In this paper, experiments were conducted on composite having various weight fractions of SiC and Al2O3particulates fabricated by stir casting method. Characterization studies were conducted on the Al 7075 alloy and composite samples to assess the hardness and microstructural properties. Final samples were tested for hardness using vickers hardness machine. Microstructure examination was conducted by optical microscope. Microstructure of the composite samples reveals the presence and homogeneous distribution of reinforcements in the Al 7075 matrix. The hardness of aluminium metal matrix composites was increased due to the addition of silicon carbide and alumina reinforcements.

scholarly journals Microstructure evaluation, thermal and mechanical characterization of hybrid metal matrix composite

2018 ◽  
Vol 25 (6) ◽  
pp. 1187-1196 ◽  
Author(s):  
Shyam Lal ◽  
Sudhir Kumar ◽  
Zahid A. Khan
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Casting Process ◽  
Xrd Analysis ◽  
Stir Casting ◽  
Al 7075 ◽  
Dta Analysis ◽  
Hybrid Metal Matrix Composite ◽  
7075 Alloy

AbstractIn this paper, an inert gas assisted electromagnetic stir casting process is adapted for manufacturing a cast hybrid metal matrix composite (MMC) using Al2O3 and SiC particulates as a hard phase reinforcement in Al 7075 alloy metal matrix. Four different samples containing 5, 10, 15 and 20 wt% of Al2O3 and SiC with Al 7075 alloy composites were fabricated. The characterizations for all the samples were carried out through optical microstructure, scanning electron microscopy (SEM) fractograph, X-ray diffraction (XRD) analysis, differential thermal analysis (DTA) analysis and mechanical properties. The results revealed that the particles are uniformly distributed in the matrix. No peaks of Al4C3 were found. There is negligible loss of material in the composite. The tensile strength and microhardness of the hybrid composite are higher by 65.7% and 13.5%, respectively, when compared to its cast metal matrix Al 7075 alloy.

scholarly journals Microstructure and mechanical characteristics of an in-situ synthesis of AA7075/TiB2 metal matrix composite

2021 ◽  
Vol 309 ◽  
pp. 01149
Author(s):  
Rahul Das ◽  
Duryodhan Sethi ◽  
Barnik Saha Roy
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Intermediate Phase ◽  
Tensile Specimen ◽  
Stir Casting ◽  
Optical Microscope ◽  
X Ray Diffraction ◽  
In Situ Reactions

In the present study, AA7075/TiB2 aluminium metal matrix composite (AMCs) was prepared by stir casting method using in-situ reactions of inorganic salts KBF4 and K2TiF6. In this process AA7075 alloy is reinforced with different weighted percentages of (5 %wt, 10 %wt, and 15 %wt) Titanium Diboride (TiB2) particles. X-ray Diffraction (XRD) investigation reveals the presence of TiB2 particles without any formation of the intermediate phase. An optical microscope was used to examine the microstructure, which revealed that the TiB2 particles are equally distributed and that grain size reduces as the weighted percentage of reinforcement particles increases. When the weighted percentage of TiB2 reinforcement particles increased, the microhardness and ultimate tensile strength of the AA7075/TiB2 AMCs increased. Furthermore, the ductile mode of failure of the tensile specimen has been observed by fractography analysis.

Aluminum Silicon Carbide Particulate Metal Matrix Composite Development Via Stir Casting Processing

Silicon ◽  
2016 ◽  
Vol 10 (2) ◽  
pp. 343-347 ◽  
Author(s):  
A. O. Inegbenebor ◽  
C. A. Bolu ◽  
P. O. Babalola ◽  
A. I. Inegbenebor ◽  
O. S. I. Fayomi
Keyword(s):  
Silicon Carbide ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Stir Casting ◽  
Particulate Metal ◽  
Aluminum Silicon Carbide ◽  
Silicon Carbide Particulate ◽  
Aluminum Silicon

A Numerical Study on Stir Casting Process in a Metal Matrix Composite Using CFD Approach

2015 ◽  
Vol 1119 ◽  
pp. 533-541 ◽  
Author(s):  
Joseph George ◽  
Sheeja Janardhanan ◽  
T.M. Sijo
Keyword(s):  
Silicon Carbide ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Numerical Study ◽  
Rotational Velocity ◽  
Casting Process ◽  
Stir Casting ◽  
Ansys Fluent ◽  
Casting Technique

This work brings out the numerical simulation of the stir casting technique for aluminium silicon carbide Metal Matrix Composite (MMC) in a closed crucible and the effect of the blade geometry and rotational velocity on solidification of the metal matrix composite has been predictedusing Computational Fluid Dynamics (CFD) approach. The material used in the crucible is silicon carbide in aluminiummetal matrix. Geometric modelling and meshing have been carried out using ANSYS ICEM CFD. Computer simulations have been carried using the commercial CFD package, ANSYS FLUENT. The calculations used 2-D discrete phase, solidification and melting model and enthalpy method. Mushy state mixing, indicative of the solidification patterns have been studied to predict the most suitable ratio of crucible to blade dimensions and speed of stirring to obtain the most uniform type of solidification which in turn induces some enhanced mechanical properties to the casting.

scholarly journals Manufacturing Feasibility of Al6061and Boron Carbide Particulate Reinforcement to Cast a Metal Matrix Composite with Wettability Agent

2019 ◽  
Vol 9 (2) ◽  
pp. 4910-4914
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Casting Process ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Optical Microscope ◽  
Alloy Matrix ◽  
Casting Technique ◽  
Base Matrix

Aluminium metal matrix composite with a combination of Al6061 as base matrix and B4C as particulate up to 0 to 3% by weight in the steps of 1 wt% is manufactured by liquid metallurgy method by stir casting process. The choice of the process has been concluded from the literature survey and is tabulated. The steps involved in the processing of composite have been reported in detail. A conventional stir casting technique and the steps followed are recorded. The different process parameters controlled during the process have been reported. With the processing of the composite, the chemical stability between the particulate and the alloy matrix as known from its properties has been ascertained. The addition of wettability agent and thus its effect has been discussed. The optical microscope images of the processed composite have been presented in the paper as an indication to successful fabrication of composite. Based on the images, distribution of particulates in matrix alloy and possible reasons for this to get exhibited have been discussed. The paper aims at bridging the gap of essentials of wetting of solid particulates and the practice of casting.

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