Microstructural evolution,mechanical properties and corrosion behavior of as-cast Mg-5Li-3Al-2Zn alloy with different Sn and Y addition  

作　　者：Xiang Peng Shihao Xu Dehua Ding Guanglan Liao Guohua Wu Wencai Liu Wenjiang Ding 

机构地区：[1]Ding National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Materials Science & Technology》2021年第13期16-22,共7页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51771115,51775334 and51821001);the Joint Fund for Space Science and Technology(No.6141B06310106);the National Defense Science and Technology Innovation Special Zone Project(No.002-002-01)。

摘　　要：Influences of Sn and Y on the microstructure,mechanical properties,and corrosion behavior of as-cast Mg-5 Li-3 Al-2 Zn(LAZ532)alloy were investigated.The addition of Sn and Y refines grains and results in the formation of Mg2 Sn and Al2 Y phases,thus improving the mechanical properties of alloy by second phase strengthening and grain refinement strengthening.As-cast LAZ532 alloy shows typical filiform corrosion morphology,and the addition of Sn and Y does not change the corrosion mode of alloy.Ascast LAZ532-0.8 Sn-1.2 Y alloy shows excellent mechanical properties with yield strength of 166.2 MPa,ultimate tensile strength of 228.6 MPa and elongation of 14.8%,and exhibits the best corrosion resistance with the smallest corrosion current density and the lowest anodic dissolution rate.

关 键 词：Mg-Li alloy SN Y Mechanical properties Corrosion behavior 

分 类 号：TG146.22[一般工业技术—材料科学与工程]