热处理对AE42压铸镁合金低周疲劳行为的影响  

Influence of Heat Treatment on Low-cycle Fatigue Behavior of Die-cast AE42 Magnesium Alloy

作　　者：吴伟[1] 李红[1] 李锋[1] 陈立佳[1] 单飞虎[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2012年第4期377-380,共4页Special Casting & Nonferrous Alloys

基　　金：国家科技支撑计划资助项目(2011BAE22B06)

摘　　要：研究了固溶+时效处理(T6)对AE42压铸镁合金在疲劳加载条件下的循环应力响应行为、疲劳寿命以及断裂行为的影响。结果表明,压铸态和固溶+时效态的AE42镁合金均表现为循环应变硬化,固溶+时效处理可导致AE42压铸镁合金的循环应力幅有所提高,并可有效提高AE42压铸镁合金的疲劳寿命。疲劳断口形貌观察结果表明,疲劳裂纹萌生于疲劳试样的表面,并以穿晶方式扩展。Influences of solid solution plus aging treatment（T6） on the cyclic stress response behavior,fatigue life and fracture behavior of die-cast AE42 magnesium alloy were investigated.The results show that AE42 magnesium alloys in different conditions as die-cast state and T6 heat treated state exhibit the cyclic strain hardening during fatigue deformation.Meanwhile,T6 heat treatment can improve the cyclic stress amplitude and fatigue life of the die-cast AE42 alloy.The observation of the fracture surfaces shows that the fatigue cracks are generated at the free surface of the specimens,and propagated in a transgranular mode.

关 键 词：热处理 压铸 循环应力响应 低周疲劳 疲劳寿命 

分 类 号：TG166.4[金属学及工艺—热处理]