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

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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.

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Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (No. 2021YFB 3701100), the National Natural Science Foundation of China (Nos. 52171104 and U20A20234), the Chongqing Research Program of Basic Research and Frontier Technology, China (Nos. cstc2021ycjh-bgzxm0086 and 2019jcyj-msxmX0306), the Fundamental Research Funds for Central Universities, China (Nos. SKLMT-ZZKT-2022R04, 2021CDJJMRH-001, and SKLMT-ZZKT-2022M12), and the 111 Project by the Ministry of Education and the State Administration of Foreign Experts Affairs of China (No. B16007).

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Authors and Affiliations

  1. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China

    Tongtong Cao, Yong Zhu, Yuyang Gao, Yan Yang, Gang Zhou, Xiaofei Cui, Bin Jiang, Xiaodong Peng & Fusheng Pan

  2. International Joint Laboratory for Light Alloys (MOE), College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Tongtong Cao, Yong Zhu, Yuyang Gao, Yan Yang, Gang Zhou, Xiaofei Cui, Bin Jiang, Xiaodong Peng & Fusheng Pan

  3. Beijing Spacecrafts, Beijing, 100090, China

    Chen Wen

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  1. Tongtong Cao
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  2. Yong Zhu
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  3. Yuyang Gao
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Cao, T., Zhu, Y., Gao, Y. et al. Optimization on microstructure, mechanical properties and damping capacities of duplex structured Mg-8Li-4Zn-1Mn alloys. Int J Miner Metall Mater 30, 949–958 (2023). https://doi.org/10.1007/s12613-022-2572-7

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  • DOI: https://doi.org/10.1007/s12613-022-2572-7

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