[1]武艳军,朱荣,卢田,等.挤压态AZ31镁合金高周疲劳行为[J].南京理工大学学报(自然科学版),2011,(01):118-121.
 WU Yan-jun,ZHU Rong,LU Tian,et al.High Cycle Fatigue Properties of Extruded AZ31 Magnesium Alloy[J].Journal of Nanjing University of Science and Technology,2011,(01):118-121.
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挤压态AZ31镁合金高周疲劳行为
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《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

卷:
期数:
2011年01期
页码:
118-121
栏目:
出版日期:
2011-02-28

文章信息/Info

Title:
High Cycle Fatigue Properties of Extruded AZ31 Magnesium Alloy
作者:
武艳军12朱荣1卢田1王经涛1
1. 南京理工大学材料科学与工程学院,江苏南京210094; 2. 南京交通职业技术学院机电工程系,江苏南京211188
Author(s):
WU Yan-jun12ZHU Rong1LU Tian1WANG Jing-tao1
1. School of Materials Science and Engineering,NUST,Nanjing 210094,China; 2. Department of Electromechanical Engineering,Nanjing Communications Institute of Technology,Nanjing 211188,China
关键词:
镁合金 高周疲劳 孪生 去孪生
Keywords:
magnesium alloys high cycle fatigue twinning detwinning
分类号:
TG113. 26
摘要:
为探讨镁合金拉/压强度不对称对疲劳性能的影响,对AZ31 镁合金进行了室温应力控制疲劳实验,研究应变幅、峰值应变、循环能量参数随周次的演化,并采用光学显微镜观察表面形貌。结果表明: 疲劳初期AZ31 镁合金滞后环呈现不对称,200 周次后不对称消失; 峰值压缩应变随周次增加而变小,在约200 周次时转变为拉伸应变; 裂纹在材料表面孪晶带处形核,并沿孪晶面扩展。由于AZ31 镁合金独特的织构与晶格特点,疲劳过程中交替出现的孪生与去孪生导致了滞后环的不对称,孪晶在裂纹形核及扩展中具有重要作用。
Abstract:
A number of uniaxial stress-controlled cyclic loading experiments are conducted for extruded AZ31 magnesium alloy in order to investigate the influence of tension-compression asymmetry on fatigue properties. The cyclic strain amplitude,peak strain and energy parameter are studied. The results show that the hysteresis loops exhibit asymmetry during initial fatigue cycles,but this asymmetry vanishes after 200 cycles. The peak compressive strain gradually decreases,and it reverses to tensile strain at about 200 cycle. Fatigue crack initiates at the twin bands in the surface, and the crack propagates along with specific twin boundaries. Twining and detwinning behaviors are often observed in the fatigue process due to texture and deformation mechanism,leading to the hysteresis loop asymmetry. The twins are crucial to the crack initiation and propagation.

参考文献/References:

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备注/Memo

备注/Memo:
基金项目:国家自然科学基金( 50901042) ; 南京理工大学科研发展基金作者简介:武艳军( 1975-) ,女,博士生,主要研究方向: 金属塑性变形及疲劳,E-mail: yjwu_wendy@ 163. com; 通讯作者: 王经涛( 1961-) ,男,教授,博士生导师,主要研究方向: 金属变形机理,E-mail: jtwang@ mail. njust. edu. cn。
更新日期/Last Update: 2012-02-28