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

Wu Wei; Li Hong; Li Feng; Chen Lijia; Shan Feihu

doi:10.15980/j.tzzz.2012.04.034

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Influence of Heat Treatment on Low-cycle Fatigue Behavior of Die-cast AE42 Magnesium Alloy
Vol. 32, Issue 4, Pages: 377-380(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.04.034

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[1]吴伟,李红,李锋,陈立佳,单飞虎.热处理对AE42压铸镁合金低周疲劳行为的影响[J].特种铸造及有色合金,2012,32(04):377-380.

Wu Wei, Li Hong, Li Feng, et al. Influence of Heat Treatment on Low-cycle Fatigue Behavior of Die-cast AE42 Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 32(4):377-380(2012)
[1]吴伟,李红,李锋,陈立佳,单飞虎.热处理对AE42压铸镁合金低周疲劳行为的影响[J].特种铸造及有色合金,2012,32(04):377-380. DOI： 10.15980/j.tzzz.2012.04.034.

Wu Wei, Li Hong, Li Feng, et al. Influence of Heat Treatment on Low-cycle Fatigue Behavior of Die-cast AE42 Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 32(4):377-380(2012) DOI： 10.15980/j.tzzz.2012.04.034.

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。

Abstract

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.