摘要
针对稀土元素Y对Mg-3Nd-0.3Zr合金动态应变时效的影响.文中在恒定应变速率4.17×10^(-5) s^(-1)下,室温和200℃条件下进行压缩实验.研究结果表明:稀土元素Y的添加引起锯齿形态和力学性能发生变化.Mg-3Nd-0.3Zr和Mg-5Y-3Nd-0.3Zr在200℃时出现动态应变时效(DSA)现象,锯齿类型分别为B型和C型,临界应变量分别为4.98%和2.20%,应力跌幅的概率统计分布分别为单峰型和双峰型;DSA对Mg-5Y-3Nd-0.3Zr合金200℃的屈服强度提高不明显.锯齿类型的改变与Y原子的添加使溶质原子扩散困难和可动位错运动受阻有关.
The influence of the rare earth element yttrium on the dynamic strain aging（DSA）of Mg-3Nd-0.3Zr alloy is investigated.A series of compressive tests were conducted at room temperature and 200 ℃ at a constant rate 4.17×10^-5 s^-1.The results show that the addition of Y causes changes in the type of serration and mechanical properties.The DSA phenomenon occurs at 200 ℃ in Mg-3 Nd-0.3 Zr and Mg-5Y-3Nd-0.3Zr,whose serrated types are type B and type C.Their critical strains are 4.98% and 2.20%,r,and their probability statistics distributions of stress drop magnitudes are unimodal type and bimodal type,respectively.DSA does no obvious contribution to the enhancement of the strength in Mg-5Y-3Nd-0.3Zr at 200 ℃.Transition of serrated types is related to the difficult diffusion of solute atoms and the impediment of mobile dislocations which are caused by the addition of Y.
作者
吴皓月
上官晓峰
刘秀兰
陈建
刘栩东
WU Haoyue;SHANG GUAN Xiao feng;LIU Xiulan;CHEN Yian;LIU Xudong(School of Materials and Chemical Engineering,Xi＇ an Technological University,Xi＇an 710021,China)
出处
《西安工业大学学报》
CAS
2018年第3期245-249,285,共6页
Journal of Xi’an Technological University
基金
国家自然科学基金(51471123)
陕西省教育厅重点实验室科研计划项目(15JS039)
关键词
形变镁合金
动态应变时效
溶质原子
可动位错
wrought magnesium alloy
dynamic strain aging
solute atom
mobile dislocation
