Simultaneously improving mechanical and anti-corrosion properties of extruded Mg-Al dilute alloy via trace Er addition

作     者：Zhi Zhang Jinshu Xie Jinghuai Zhang Hao Dong Shujuan Liu Xiaobo Zhang Jun Wang Ruizhi Wu Zhi Zhang;Jinshu Xie;Jinghuai Zhang;Hao Dong;Shujuan Liu;Xiaobo Zhang;Jun Wang;Ruizhi Wu

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 Jiangsu Key Laboratory of Advanced Structural Materials and Application TechnologyNanjing Institute of TechnologyNanjing 211167China Ningbo BranchOrdnance Science Institute of ChinaNingbo 315103China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2023年第150卷第19期

页      面：49-64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：support of the National Natural Science Foundation of China (Nos.51871069 and 52071093) the Opening Project of Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology (No.ASMA202205). 

主　　题：Magnesium alloy Mechanics-corrosion synergy Rare earth element SKPFM 

摘      要：Simultaneously improving the mechanical properties and corrosion resistance of magnesium(Mg)alloys is a long-standing challenge to be solved in their engineering applications.In this work,we find that trace Er addition can improve the mechanical and anti-corrosion properties of Mg-1.4Al-0.4Mn-0.4Ca-0.3Er(wt%,AMXE)dilute alloy synergistically,especially reducing the corrosion rate(0.75 mm y-1)by one order of magnitude compared with the reference Mg-1.4Al-0.4Mn-0.4Ca(AMX)alloy and making it comparable to that of high-purity Mg.Adding trace Er reduces the dynamic recrystallization degree and increases the strengthening phase particles,which is mainly responsible for the increase of yield strength by 42 MPa.The addition of Er promotes the formation of much less noble Al8Mn4Er with effective Fe trapping ability and induces dislocation segregation,thus dramatically reducing micro-galvanic corrosion tendency.Meanwhile,Er addition promotes the formation of a more passivation and dense corrosion film.These two factors together lead to the extremely low corrosion rate of AMXE alloy.Our findings are expected to promote the development of low alloyed high performance Mg alloys.