Influences of Sn and Y on the microstructure, mechanical properties, and corrosion behavior of as-cast Mg-5Li-3Al-2Zn (LAZ532) alloy were investigated. The addition of Sn and Y refines grains and results in the formation of Mg₂Sn and Al₂Y 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. As-cast LAZ532−0.8Sn-1.2Y 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.

研究了锡和钇对铸态Mg-5Li-3Al-2Zn（LAZ532）合金的组织，力学性能和腐蚀行为的影响。Sn和Y的添加使晶粒细化并导致形成Mg ₂ Sn和Al ₂Y相，因此通过第二相强化和晶粒细化强化来改善合金的机械性能。铸态LAZ532合金表现出典型的丝状腐蚀形态，Sn和Y的添加不会改变合金的腐蚀方式。铸态LAZ532−0.8Sn-1.2Y合金具有优异的机械性能，屈服强度为166.2 MPa，极限抗拉强度为228.6 MPa，伸长率为14.8％，并具有最佳的耐腐蚀性，最小的腐蚀电流密度和最低的阳极溶出度。