稀土Gd对Mg-5Al系镁合金显微组织与疲劳性能的影响  

Effect of rare earth element Gd on microstructure and fatigue properties of Mg-5Al series magnesium alloys

作　　者：张志鹏[1] 吴伟[1] 代丽[1] 陈立佳[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2016年第1期42-48,共7页Journal of Shenyang University of Technology

基　　金：辽宁省教育厅创新团队项目(LT2013004);辽宁省教育厅科学技术研究项目(L2012038)

摘　　要：为了确定稀土元素Gd和时效处理对Mg-5Al系压铸镁合金显微组织及疲劳性能的影响,通过低周疲劳实验对压铸态和时效态Mg-5Al-x Gd镁合金的显微组织和疲劳性能进行了表征.结果表明,提高压铸态和时效态Mg-5Al-x Gd镁合金中Gd的含量,可使镁合金的显微组织得到细化.在总应变幅控制的低周疲劳加载条件下,压铸态和时效态Mg-5Al-x Gd镁合金均呈现出循环硬化和循环稳定特征,时效处理可以提高Mg-5Al-x Gd压铸镁合金的循环变形抗力.对于压铸态镁合金而言,Gd含量为1%时镁合金的循环变形抗力高于Gd含量为2%和3%的镁合金,而对于时效态镁合金而言,Gd含量为1%和2%时镁合金的循环变形抗力均高于Gd含量为3%的镁合金.In order to determine the influence of rare earth element Gd and aging treatment on both microstructure and fatigue properties of Mg-5Al series magnesium alloys, the microstructure and fatigue properties of die-cast and aged Mg-5Al-xGd magnesium alloys were characterized through the low-cycle fatigue test. The results show that with increasing the Gd content in the die-cast and aged Mg-5Al-xGd magnesium alloys, the rnicrostructure of the magnesium alloys can be refined. Under the total strain amplitude controlled low cycle fatigue loading condition, both die-cast and aged Mg-5Al-xGd magnesium alloys exhibit the cyclic strain hardening and cyclic stability features. The aging treatment can enhance the cyclic deformation resistance of Mg-5Al-xGd magnesium alloys. For the die-cast magnesium alloys, the cyclic deformation resistance of the magnesium alloy with 1% Gd is higher than that of the magnesium alloys with 2% and 3% Gd. For the aged magnesium alloys, the cyclic deformation resistance of the magnesium alloys with 1% and 2% Gd is higher than that of the magnesium alloy with 3% Gd.

关 键 词：镁合金 稀土 显微组织 低周疲劳 循环应力响应 循环变形抗力 压铸 时效 

分 类 号：TG146.2[一般工业技术—材料科学与工程]