Low-cycle Fatigue Behavior of Die Cast Mg-7Al-0.5Y Magnesium Alloy

Li Feng; Qi Yongfeng; Wu Wei; Chen Lijia; Liu Zheng

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Low-cycle Fatigue Behavior of Die Cast Mg-7Al-0.5Y Magnesium Alloy
Issue 3, Pages: 201-203(2007)
Published： 2007 ，
DOI：

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[1]李锋,齐永丰,吴崴,陈立佳,刘正.压铸态Mg-7Al-0.5Y合金的低周疲劳行为[J].特种铸造及有色合金,2007(03):201-203+161-162.

Li Feng, Qi Yongfeng, Wu Wei, et al. Low-cycle Fatigue Behavior of Die Cast Mg-7Al-0.5Y Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys (3):201-203(2007)
[1]李锋,齐永丰,吴崴,陈立佳,刘正.压铸态Mg-7Al-0.5Y合金的低周疲劳行为[J].特种铸造及有色合金,2007(03):201-203+161-162. DOI：

Li Feng, Qi Yongfeng, Wu Wei, et al. Low-cycle Fatigue Behavior of Die Cast Mg-7Al-0.5Y Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys (3):201-203(2007) DOI：

摘要

研究了压铸态Mg-7Al-0.5Y合金在全反向总应变模式控制下的低周疲劳行为。结果表明

在所采用的不同外加总应变幅下

压铸态Mg-7Al-0.5Y合金均可呈现循环应变硬化

且在0.9%的外加总应变幅下

合金在疲劳变形期间发生了动态应变时效;合金的弹性应变幅、塑性应变幅与断裂时的载荷反向周次之间的关系可分别由Basquin和Coffin-Manson描述。断口形貌的扫描电子显微分析揭示

低周疲劳加载条件下

对于压铸态Mg-7Al-0.5Y合金而言

疲劳裂纹以穿晶方式萌生于疲劳试样表面

并以穿晶方式扩展。

Abstract

The low-cycle fatigue behavior of the die cast Mg-7Al-0.5Y magnesium alloy has been investigated in case of full reversed total strain control mode.The experimental results reveal that die cast Mg-7Al-0.5Y magnesium alloy exhibits the cyclic strain hardening with various total strain amplitudes

in which the dynamic strain aging phenomena can be observed during low-cycle fatigue deformation with the total strain amplitudes of 0.9%.For the die cast Mg-7Al-0.5Y magnesium alloy

the relations between the elastic strain amplitude

plastic strain amplitude and reversals to failure can be described by the Basquin and the Coffin-Manson equation

respectively.The SEM analysis of the fracture morphology shows that the fatigue crack is created at the surface of the specimens and propagated in a transgranular mode in case of low-cycle loading.