Y对Mg-3Nd-0.3Zr合金动态应变时效的影响  

Influence of Y on the Serrated Flow Behavior of Mg-3Nd-0.3Zr Alloy

作　　者：吴皓月[1] 上官晓峰[1] 刘秀兰[1] 陈建[1] 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)

机构地区：[1]西安工业大学材料与化工学院,西安710021

出　　处：《西安工业大学学报》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)

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.

关 键 词：形变镁合金 动态应变时效 溶质原子 可动位错 

分 类 号：TG113[金属学及工艺—物理冶金]