挤压态AZ31镁合金的疲劳行为研究

毛萍莉; 李扬; 刘正; 贾莹莹; 陈立佳

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挤压态AZ31镁合金的疲劳行为研究
Fatigue Behavior of As-extruded AZ31 Magnesium Alloy
2010年30卷第3期页码：213-215
纸质出版日期： 2010 ，
DOI：

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[1]毛萍莉,李扬,刘正,贾莹莹,陈立佳.挤压态AZ31镁合金的疲劳行为研究[J].特种铸造及有色合金,2010,30(03):213-215+190.

Mao Pingli, Li Yang, Liu Zheng, et al. Fatigue Behavior of As-extruded AZ31 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2010,30(3):213-215.
[1]毛萍莉,李扬,刘正,贾莹莹,陈立佳.挤压态AZ31镁合金的疲劳行为研究[J].特种铸造及有色合金,2010,30(03):213-215+190. DOI：

Mao Pingli, Li Yang, Liu Zheng, et al. Fatigue Behavior of As-extruded AZ31 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2010,30(3):213-215. DOI：

摘要

通过外加总应变幅控制的疲劳试验和断口形貌分析

确定了挤压态AZ31镁合金的循环应力响应行为、循环变形行为、疲劳寿命行为和疲劳断裂机制。结果表明

在外加总应变幅控制的疲劳加载条件下

挤压态AZ31镁合金呈现明显的循环应变硬化现象和拉-压不对称循环变形现象

其弹性应变幅、塑性应变幅与断裂时的载荷反向周次之间的关系可分别用Basquin和Coffin-Manson公式来描述

断口上的疲劳裂纹的萌生和扩展均以穿晶模式进行。

Abstract

Behaviors of cyclic stress response and cyclic deformation

fatigue life as well as fracture mechanism were identified for as-extruded AZ31 magnesium alloy through total-strain-amplitude controlled fatigue testing and analysis on fracture surface of fatigued specimens.The results indicate that the as-extruded AZ31 alloy exhibits significant cyclic strain hardening and stretch-compression asymmetry in cyclic deformation

and the relationship between elastic strain amplitude

plastic strain amplitude and reversal to failure can be described by the Basquin and Coffin-Manson equations

respectively.In addition

it is found that fatigue cracks are generated and propagated in a transgranular mode.