Evaluation of microstructure and mechanical properties of Al/Al2O3/SiC hybrid composite fabricated by accumulative roll bonding process
Azin Ahmadi, Mohammad Reza Toroghinejad
, Abbas Najafizadeh
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
In this investigation, a new kind of metal matrix composites with a matrix of pure aluminum and hybrid
reinforcement of Al2O3 and SiC particles was fabricated for the first time by anodizing followed by eight
cycles accumulative roll bonding (ARB). The resulting microstructures and the corresponding mechanical
properties of composites within different stages of ARB process were studied. It was found that with
increasing the ARB cycles, alumina layers were fractured, resulting in homogenous distribution of
Al2O3 particles in the aluminum matrix. Also, the distribution of SiC particles was improved and the
porosity between particles and the matrix was decreased. It was observed that the tensile strength of
composites improved by increasing the ARB passes, i.e. the tensile strength of the Al/1.6 vol.% Al2O3/
1 vol.% SiC composite was measured to be about 3.1 times higher than as-received material. In addition,
tensile strength of composites decreased by increasing volume fraction of SiC particles to more than
1 vol.%. Scanning electron microscopy (SEM) observation of fractured surfaces showed that the failure
mechanism of broken hybrid composite was shear ductile rupture.
2013 Elsevier Ltd. All rights reserved
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