本文采用单向拉伸、单向压缩和热挤压方法,研究了压铸法制备的 SiC_w/Al 复合材料的塑性变形行为。结果表明,随应力状态由拉应力到压应力,SiC_w/Al 复合材料的极限塑变量明显增加。这种复合材料的拉伸屈服强度较低,但塑变强化效果较大,延伸率随温度升高而提高。随变形量增加,SiC 晶须发生明显的沿变形方向的取向,并且长径比减小。 In this paper, the plastic deformation behavior of SiC_w / Al composites prepared by die-casting method was studied by uniaxial stretching, uniaxial compression and hot extrusion. The results show that with the stress state from tensile stress to compressive stress, the ultimate plastic deformation of SiC_w / Al composites increases obviously. The tensile yield strength of this composite material is lower, but the plastic deformation strengthening effect is larger, the elongation increases with increasing temperature. As the amount of deformation increases, the orientation of SiC whiskers along the deformation direction obviously decreases, and the aspect ratio decreases.