Optimization on microstructure, mechanical properties and damping capacities of duplex structured Mg–8Li–4Zn–1Mn alloys

Tongtong Cao; Yong Zhu; Yuyang Gao; Yan Yang; Gang Zhou; Xiaofei Cui; Chen Wen; Bin Jiang; Xiaodong Peng; Fusheng Pan

doi:10.1007/s12613-022-2572-7

Volume 30 Issue 5

May 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(5): 949-958

Tongtong Cao, Yong Zhu, Yuyang Gao, Yan Yang, Gang Zhou, Xiaofei Cui, Chen Wen, Bin Jiang, Xiaodong Peng, and Fusheng Pan, Optimization on microstructure, mechanical properties and damping capacities of duplex structured Mg–8Li–4Zn–1Mn alloys, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 949-958. https://doi.org/10.1007/s12613-022-2572-7

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Tongtong Cao, Yong Zhu, Yuyang Gao, Yan Yang, Gang Zhou, Xiaofei Cui, Chen Wen, Bin Jiang, Xiaodong Peng, and Fusheng Pan, Optimization on microstructure, mechanical properties and damping capacities of duplex structured Mg–8Li–4Zn–1Mn alloys, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 949-958. https://doi.org/10.1007/s12613-022-2572-7

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Research Article

Optimization on microstructure, mechanical properties and damping capacities of duplex structured Mg–8Li–4Zn–1Mn alloys

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Corresponding authors:
Yuyang Gao E-mail: gaoyuyang@cqu.edu.cn

Yan Yang E-mail: yanyang@cqu.edu.cn
Received: 6 August 2022; Revised: 23 October 2022; Accepted: 8 November 2022; Available online: 10 November 2022

Abstract

Abstract

Optimizing the mechanical properties and damping capacity of the duplex-structured Mg–Li–Zn–Mn alloy by tailoring the microstructure via hot extrusion was investigated. The results show that the Mg–8Li–4Zn–1Mn alloy is mainly composed of α-Mg, β-Li, Mg–Li–Zn, and Mn phases. The microstructure of the test alloy is refined owing to dynamic recrystallization (DRX) during hot extrusion. After hot extrusion, the crushed precipitates are uniformly distributed in the test alloy. The yield strength (YS), ultimate tensile strength (UTS), and elongation (EL) of as-extruded alloy reach 156 MPa, 208 MPa, and 32.3%, respectively, which are much better than that of as-cast alloy. Furthermore, the as-extruded and as-cast alloys both exhibit superior damping capacities, with the damping capacity ($ {Q}^{-1} $) of 0.030 and 0.033 at the strain amplitude of 2 × 10⁻³, respectively. The mechanical properties of the test alloy can be significantly improved by hot extrusion, whereas the damping capacities have no noticeable change, which indicates that the duplex-structured Mg–Li alloys with appropriate mechanical properties and damping properties can be obtained by alloying and hot extrusion.
- magnesium–lithium alloys;
- hot extrusion;
- microstructure;
- mechanical properties;
- damping capacity

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