AZ91镁合金的应变疲劳行为研究  

Study on strain fatigue behavior of magnesium alloy AZ91

作　　者：郝雪枫[1] 赵东宁[1] 宋兴奎[2] 慈鸿钢[2] 

机构地区：[1]沈阳市特种设备检测研究院,辽宁沈阳110035 [2]沈阳工业大学材料学院,辽宁沈阳110023

出　　处：《轻合金加工技术》2007年第12期41-44,52,共5页Light Alloy Fabrication Technology

摘　　要：研究了铸态和挤压态AZ91镁合金的室温应变疲劳行为。结果表明,铸态镁合金表现为循环应变硬化,而挤压态镁合金可呈现循环应变硬化、软化或循环稳定。与此同时,对两种状态的AZ91镁合金的应变寿命行为和循环应力-应变行为进行了分析测试,确定了相应的室温应变疲劳参数。此外,利用扫描电子显微镜观察分析了铸态和挤压态AZ91镁合金的疲劳裂纹萌生和扩展行为。The fatigue behavior of as-cast and as-extruded AZ91 maguesium alloys was investigated under rotal strain amplitude control mode. The test results revealed that for the as-east alloy, a cyclic strain hardening behavior could be observed. However, the as-extruded alloy would exhibit cyclie strain hardening, softening or stability. At the same time, both strain fatigue life behavior and cyclic stress-strain curve of as-cast and as-extruded maguesium alloys were analyzed, and thus, the corresponding strain fatigue parameters were determined. In addition, the crack initiation and propagation mechanism of the alloys was suggested based on the SEM observation on fracture surfaces of fatigued speeimens.

关 键 词：镁合金 应变疲劳 循环应力响应 疲劳寿命 疲劳裂纹 

分 类 号：TG115[金属学及工艺—物理冶金]