Study on Micro-Deformation Behavior of Sicp/Al Composites at Low Stress

Abstract

In this paper, SiCp/Al composites were fabricated by spontaneous infiltration technology. The micro-deformation behavior (MDB) of low tress in some silicon carbide particulate reinforced aluminum composites (SiCp/Al composites) was investigated experimentally. The microstructure, micro-deformation of samples was analyzed by OM and WDW-50 respectively. The results show that, in aluminum matrix with incorporating SiCp, the distribution of SiCp was uniform. In the same other conditions, SiCp size of the composite plays an important role on MDB at low stress, and the micro-deformation performance of the SiCp/Al composite increases with decreasing of SiCp size. MDB of composites at low stress deeply depends on the matrix material, and MDB increases with increasing of the matrix strength. It was also found that, the micro-deformation of SiCp/Al composite was negative value in the early stages of low tensile stress, and the phenomenon can be explained by strain relaxation.