挤压变形AM30镁合金的循环变形行为  

Cyclic deformation behavior of extruded AM30 magnesium alloy

作　　者：陈克豹[1] 王鑫[1] 陈立佳[1] 刘正[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2013年第2期171-175,共5页Journal of Shenyang University of Technology

基　　金：辽宁省高等学校优秀人才支持计划项目(LR201030)

摘　　要：为了深入理解挤压变形AM30镁合金在低周疲劳加载条件下的循环应力响应行为和循环应力应变行为,针对挤压态以及经过固溶处理和固溶+时效处理的挤压变形AM30镁合金进行了应变控制的室温疲劳试验.结果表明,不同加工处理状态的挤压变形AM30镁合金在疲劳变形期间可呈现循环应变硬化和稳定的循环应力响应行为;不同加工处理状态的挤压变形AM30镁合金的循环应力幅与塑性应变幅之间呈线性关系,且固溶处理和固溶+时效处理均可提高挤压变形AM30镁合金的循环强度系数和循环应变硬化指数;在较高的外加总应变幅下,不同加工处理状态的挤压变形AM30镁合金均表现出典型的拉压不对称循环变形行为.In order to understand the cyclic stress response and stress-strain behaviors of extruded AM30 magnesium alloy under low-cycle fatigue loading condition, the strain-controlled fatigue experiments at room temperature were performed for the extruded AM30 magnesium alloy with as-extruded, solid solution and solid solution plus aging states. The results reveal that the extruded AM30 magnesium alloy with different treated states exhibits such cyclic stress response behavior as cyclic strain hardening and cyclic stability during the fatigue deformation period. A linear relationship between the cyclic stress amplitude and plastic strain amplitude is noted for the extruded AM30 magnesium alloy with different treated states. In addition, both solid solution and solid solution plus aging treatments can enhance the cyclic strength coefficient and cyclic strain hardening exponent of the extruded AM30 magnesium alloy. During the fatigue deformation at higher total strain amplitudes, the extruded AM30 magnesium alloy with different treated states shows the typical deformation behavior of tension-compression asymmetry.

关 键 词：镁合金 挤压态 低周疲劳 循环变形 循环硬化 循环软化 滞后回线 拉压不对称 

分 类 号：TG113.25[金属学及工艺—物理冶金]