【作者】 刘家满； 赵敏； 董尚利； 杨德庄； 吴昆；

【Author】 Liu Jiaman Zhao Min Dong Shangli Yang Dezhuang Wu Kun (School of Materials Science and Engineering Harbin Institute of Technology Harbin, 150001)

【机构】 哈尔滨工业大学材料科学与工程学院；

【摘要】 利用热循环试验、拉伸试验和扫描电镜观察等实验方法,研究了热循环对挤压态SiC_w/AZ91镁基复合材料力学性能的影响。结果表明,挤压态SiC_w/AZ91镁基复合材料经热循环后,随循环次数的增加,其抗拉强度σ_b有逐步降低的趋势。主要原因是:金属基复合材料中增强体与基体存在明显的热膨胀系数差异,温度变化必然产生热残余应力,将对复合材料性能造成不良影响。更多还原

【Abstract】 The thermal cycling on the mechanical properties of extruded SiCw/AZ91 composites were studied by means of scanning election microscopy (SEM). It is shown that mechanical properties of extruded SiCw/AZ91 composites drop with the times of thermal cycling. It is explained that the thermal expansion coefficient between the whisker and matrix is obvious variant. The change of temperature results in the generation of thermal residual stress, and will have bad effects on the composites.更多还原