Designing new low alloyed Mg-RE alloys with high strength and ductility via high-speed extrusion

作     者：Jinshu Xie Zhi Zhang Shujuan Liu Jinghuai Zhang Jun Wang Yuying He Liwei Lu Yunlei Jiao Ruizhi Wu Xie Jinshu;Zhang Zhi;Liu Shujuan;Zhang Jinghuai;Wang Jun;He Yuying;Lu Liwei;Jiao Yunlei;Wu Ruizhi

作者机构：Key Laboratory of Superlight Material and Surface TechnologyMinistry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Ningbo BranchOrdnance Science Institute of ChinaNingbo 315103China School of Materials Science and EngineeringHunan University of Science and TechnologyXiangtan 411201China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2023年第30卷第1期

页      面：82-91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：supported by the National Natural Science Foundation of China(Nos.52071093 and 51871069) the Key Laboratory of Micro-Systems and Micro-Structures Manufacturing(HIT) Ministry of Education(No.2020 KM009) the Student Research and Innovation Fund of the Fundamental Research Funds for the Central Universities(No.3072022GIP1004) the Science and Technology Innovation Major Project of Ningbo City,China(No.2019B10103). 

主　　题：magnesium alloys high-speed extrusion high strength high ductility solute segregation 

摘      要：Two new low-alloyed Mg-2RE-0.8Mn-0.6Ca-0.5Zn(wt%,RE=Sm or Y)alloys are developed,which can be produced on an in-dustrial scale via relatively high-speed extrusion.These two alloys are not only comparable to commercial AZ31 alloy in extrudability,but also have superior mechanical properties,especially in terms of yield strength(YS).The excellent extrudability is related to less coarse second-phase particles and high initial melting point of the two as-cast alloys.The high strength-ductility mainly comes from the formation of fine grains,nano-spaced submicron/nano precipitates,and weak texture.Moreover,it is worth noting that the YS of the two alloys can maintain above 160 MPa at elevated temperature of 250°C,significantly higher than that of AZ31 alloy(YS:45 MPa).The Zn/Ca solute segregation at grain boundaries,the improved heat resistance of matrix due to addition of RE,and the high melting points of strengthening particles(Mn,MgZn_(2),and Mg-Zn-RE/Mg-Zn-RE-Ca)are mainly responsible for the excellent high-temperature strength.