Abstract
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.
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