Particle shape effects on ductility of SiC particle reinforced LD2 matrix composites investigatedby AFM-based nanoindentation

来源期刊：中国有色金属学报(英文版)2001年第4期

论文作者：刘澄 张国定 M. Naka

文章页码：509 - 512

Key words：micromechanical properties; nanoindentation; interface; ductility

Abstract: An AFM (Atomic Force Microscope)-based nanoindentation method for local measurement of mechanical properties near interfaces in both angular and blunted SiC particle reinforced LD2 composites is presented. The blunted composite exhibits an improved ductility than the angular counterpart. The nanoindentation examination shows that the micromechanical properties near interfaces distribute unevenly and vary with particle shape in the SiC_p/LD2 composites. There are a higher nanohardness value and a lower plastic deformation capacity around an angular particle than around a blunted one. It is inferred that the residual stress and strain concentrations are severer around the angular particle, which causes matrix cracking at a lower external strain level and leads to a lower ductility of the angular composite.