摘要
为了确定稀土元素Nd对Mg-8%Al系压铸镁合金低周疲劳行为的影响规律,在不同外加总应变幅下针对压铸态Mg-8%Al-xNd进行了应变控制的室温疲劳试验.结果表明,低周疲劳加载条件下,压铸态Mg-8%Al-xNd镁合金可表现为循环应变硬化和循环稳定,主要取决于外加总应变幅的高低以及Nd的质量分数;适量稀土元素Nd的添加可有效提高压铸态Mg-8%Al系合金的疲劳寿命;压铸态Mg-8%Al-xNd合金的弹性应变幅、塑性应变幅与疲劳断裂时载荷反向周次之间的关系可分别用Basquin和Coffin-Manson公式描述.疲劳断口形貌观察结果表明,对于压铸态Mg-8%Al-xNd合金,低周疲劳裂纹均是以穿晶方式萌生并以穿晶方式扩展的.
In order to determine the influence of rare earth element Nd on the low-cycle fatigue behavior of the Mg-8% Al series die-cast magnesium alloys,the fatigue tests were performed for the die-cast Mg-8% Al-xNd alloys at room temperature under different total strain amplitudes.The experimental results show that the die-cast Mg-8% Al-xNd alloys exhibit the cyclic strain hardening and stable cyclic stress response during fatigue deformation,which mainly depends on the imposed total strain and Nd content.The addit...
出处
《沈阳工业大学学报》
EI
CAS
2010年第6期633-638,共6页
Journal of Shenyang University of Technology
基金
辽宁省教育厅基金资助项目(2004D012)
关键词
镁合金
稀土Nd
低周疲劳
循环应变硬化
循环稳定
疲劳寿命
弹性应变幅
塑性应变幅
magnesium alloy
rare earth element Nd
low-cycle fatigue
cyclic strain hardening
stable cyclic stress response
fatigue life
elastic strain amplitude
plastic strain amplitude
