【作者】 毛萍莉； 刘正； 王长义； 王峰；

【Author】 Pingli Mao,Zheng Liu,Changyi Wang,Feng Wang School of Materials Science and Engineering,Shenyang University of Technology 111 Shenliao West Road,Shenyang Economic and Technological Development Area 110870,Shenyang China.

【机构】 沈阳工业大学材料科学与工程学院；

【摘要】 本文采用扫描电子显微镜(SEM)及光学金相显微镜(OM)分析了挤压态AM30镁合金在高速压缩及拉伸载荷作用下沿挤压方向及横向断裂之后的微观组织形貌,分析了不同微观形貌的形成原因。研究结果表明:挤压态AM30镁合金高速压缩时为脆性断裂,而高速拉伸时不论是横向还是挤压方向均为韧脆混合断裂,且随着应变速率的增加脆性所占比例在逐渐增加。挤压态AM30镁合金在高速冲击载荷作用下的失效形式除了断裂之外,还有绝热剪切及内部裂纹扩展。更多还原

【Abstract】 The micro-fracture morphology of the alloy under high strain rate tension and compression loading were analyzed by scanning electron microscopy(SEM) and optical microscopy(OM).The tension and compression were conducted along extrusion direction and transverse direction,respectively.The results show that the compression fracture is brittle,however the high strain rate tension fracture is mixed mode of ductile and brittle,with increasing the strain rate the fracture ratio of brittle to ductility is increasing.Besides the fracture,the failure mode of extruded AM30 magnesium alloy under high strain rate are adiabatic shear band and crack propagation.更多还原