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.

[parspalpaiddownloads id=”111″]

FOR Finite Element Method 3D design & FEM simulations corporation