Microstructural evolution, mechanical properties and corrosion behavior of as-cast Mg-5Li-3Al-2Zn alloy with different Sn and Y addition
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第13期
论文作者：Xiang Peng Shihao Xu Dehua Ding Guanglan Liao Guohua Wu Wencai Liu Wenjiang Ding
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.
Xiang Peng，Shihao Xu，Dehua Ding，Guanglan Liao，Guohua Wu，Wencai Liu，Wenjiang 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
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.
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