Effect of Zn addition on microstructure and mechanical properties of Mg-3Y-2Nd-0.5Zr alloy

作     者：Fei-yu He Wen-xin Hu Li-juan Liu Shao-bo Ma Wei He Fei-yu He;Wen-xin Hu;Li-juan Liu;Shao-bo Ma;Wei He

作者机构：State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive UtilizationBaotou 014030Inner MongoliaChina Baotou Research Institute of Rare EarthsBaotou 014030Inner MongoliaChina Technical Center of Steel Union Co.Ltd.of Baotou Steel(Group)Corp.Baotou 014010Inner MongoliaChina 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2023年第20卷第4期

页      面：299-306页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financially supported by the Natural Science Foundation of Inner Mongolia under Grant No.2022MS05045 the Science and Technology Planning of Inner Mongolia under Grant No.2020GG0175 the Project of State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization under Grant No.2021Z2351。 

主　　题：Mg-3Y-2Nd-0.5Zr Zn-Zr precipitates microstructure mechanical properties 

摘      要：The effect of 0.5wt.%Zn addition on the microstructure and mechanical properties of Mg-3Y-2Nd-0.5Zr(WE32)alloy was investigated.The results indicate that WE32-0.5Zn alloy takes 48 h to reach peak hardness after solid solution treatment at 525℃and aging at 200℃,10 h earlier than WE32 alloy,which implies an accelerated aging precipitation kinetics owing to the addition of 0.5wt.%Zn.A large quantity of finerod and rectangular block-like Zn-Zr precipitates in theα-Mg matrix are formed in the WE32-0.5Zn alloy,and numerous needle-likeβ1phases are distributed at both ends of the Zn-Zr precipitates at peak-aged condition.In peak-aged condition,the ultimate tensile strength considerably increases from 263.2 MPa(WE32)to 309.6 MPa(WE32-0.5Zn),and the elongation dramatically increases from 4.3%(WE32)to 8.9%(WE32-0.5Zn).Theβ’andβ1phases are the main precipitates of the WE32-0.5Zn alloy peak-aged at 200℃.Theβ’andβ1phases easily nucleate at the Zn-Zr precipitates,and theβ1phases are particularly likely to nucleate and grow at the interface between the two ends of the Zn-Zr precipitates,which accelerates aging precipitation kinetics and leads to a shorter time to achieve peak aging.