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本文用扫描电镜（ＳＥＭ）下的单面缺口拉伸试验，考察了Ａｌ／ＳｉＣｐ试样的空穴的生成，裂纹的扩展以及裂纹前端微断裂区，指出该材料变脆的原因是由于微断裂区中的一次空穴所造成的．
In this paper, single-sided notched tensile test under scanning electron microscope (SEM) was used to investigate the formation of cavities, the propagation of cracks and the front-end micro-fracture zone in Al / SiCp samples. It is pointed out that the reason of the brittleness is that micro- A hole in the area caused by.