Microstructure evolution and enhanced fatigue behavior in the Mg-10Li-5Zn-0.5Er alloys micro-alloyed with Yb

作     者：Guanglan Liao Guohua Wu Wencai Liu Jiawei Sun Lv Xiao Song Pang Peijun Chen Guanglan Liao;Guohua Wu;Wencai Liu;Jiawei Sun;Lv Xiao;Song Pang;Peijun Chen

作者机构：National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix CompositeSchool of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Spaceflight Precision Machinery InstituteShanghai 201600China Shanghai Engineering Technology Research Center of Near-Net-Shape Forming for Metallic MaterialsShanghai 201600China Luoyang Shengya Magnesium Alloy Technology Co.LtdLuoyang 471921China 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2024年第12卷第8期

页      面：3159-3172页

核心收录：

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

基　　金：financially supported by the Major Scientific and Technological Innovation Projects in Luoyang (No. 2201029A) Foundation Strengthening Plan Technical Field Fund (No. 2021-JJ-0112) National Natural Science Foundation of China (Nos. 51821001 and U2037601) Research Program of Joint Research Center of Advanced Spaceflight Technologies (No. USCAST2020-14) 

主　　题：Mg-Li alloy Yb Microstructure Fatigue property Hot extrusion 

摘      要：In this paper,(0.2-1 wt%)Yb was added to improve the tensile properties and high-cycle fatigue behavior of the as-cast and as-extruded Mg-10Li-5Zn-0.5Er *** is found that Yb mainly affects the mechanical properties of the alloy by changing the grain size,type and morphology of the second *** mainly exists in the formation of Mg_(2)Yb and Mg-Zn-Yb phases in the metallographic *** the addition of Yb,the grains are refined and these Yb-containing phases replace the large-sized MgLiZn phase to be enriched at the grain *** the addition of excess Yb reduces the number of small-sized MgLiZn phases in the grain,thus reducing the alloys’mechanical *** extrusion,the small-sized MgLiZn phase is refined and the number increases,which effectively improves the tensile and fatigue strength of the *** fatigue strength is mainly affected by the number and morphology of the second phase,positively correlated with the *** in grain size and number and size of second phases,the extruded alloy with 0.2Yb added exhibits excellent mechanical properties with the yield strength,ultimate tensile strength and elongation of 292 MPa,303 MPa and 11.7%,and an fatigue strength of 130 MPa.