Processing of nanostructured metallic matrix composites by a modified accumulative roll bonding method with structural and mechanical considerations

摘要

Particulate reinforced metallic matrix composites have attracted considerable attention due to their lightweight,high strength,high specific modulus,and good wear resistance.AlB 4 C composite strips were produced in this work by a modified accumulative roll bonding process where the strips were rotated 90° around the normal direction between successive passes.Transmission electron microscopy and X-ray diffraction analyses reveal the development of nanostructures in the Al matrix after seven passes.It is found that the B 4 C reinforcement distribution in the matrix is improved by progression of the process.Additionally,the tensile yield strength and elongation of the processed materials are increased with the increase of passes.