【作者】 吴昆； 严峰； 赵敏；

【Author】 Wu Kun Yan Feng Zhao Min ( Harbin Institute of Technology Harbin 150001)

【机构】 哈尔滨工业大学；

【摘要】 对SiCw/MB15镁基复合材料的超塑性变形行为进行了研究。结果表明SiCw/MB15镁基复合材料在340℃,应变速率为1.66×10^-2s^-1变形条件下,断裂延伸率达到200%,应变速率敏感性指数（m）为0.35。基体合金晶粒在变形中发生了滑动与转动,在晶须端部与基体的界面上形成空洞,空洞长大连接成裂纹导致试样断裂。更多还原

【Abstract】 The superplastic characteristics of SiCw/MB15 magnesium matrix composites were investigated. The results show that the SiCw/MB15 magnesium matrix composites exhibit a total elongation of 200% and m value of 0.35 at the initial strain rate of 1.66×10-2s-1 and at 340℃. The matrix grain boundary sliding took place during the superplastic deformation, the cavities formed at the interface of matrix and whiskers end, and linked together, leading to the failure of the composite.更多还原