Designing new low alloyed Mg–RE alloys with high strength and ductility via high-speed extrusion

Jinshu Xie; Zhi Zhang; Shujuan Liu; Jinghuai Zhang; Jun Wang; Yuying He; Liwei Lu; Yunlei Jiao; Ruizhi Wu

doi:10.1007/s12613-022-2472-x

Volume 30 Issue 1

Jan. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(1): 82-91

Jinshu Xie, Zhi Zhang, Shujuan Liu, Jinghuai Zhang, Jun Wang, Yuying He, Liwei Lu, Yunlei Jiao, and Ruizhi Wu, Designing new low alloyed Mg–RE alloys with high strength and ductility via high-speed extrusion, Int. J. Miner. Metall. Mater., 30(2023), No. 1, pp. 82-91. https://doi.org/10.1007/s12613-022-2472-x

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Jinshu Xie, Zhi Zhang, Shujuan Liu, Jinghuai Zhang, Jun Wang, Yuying He, Liwei Lu, Yunlei Jiao, and Ruizhi Wu, Designing new low alloyed Mg–RE alloys with high strength and ductility via high-speed extrusion, Int. J. Miner. Metall. Mater., 30(2023), No. 1, pp. 82-91. https://doi.org/10.1007/s12613-022-2472-x

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Research Article

Designing new low alloyed Mg–RE alloys with high strength and ductility via high-speed extrusion

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Corresponding authors:
Jinghuai Zhang    E-mail: zhangjinghuai@hrbeu.edu.cn

Jun Wang    E-mail: nafion412@163.com

Liwei Lu    E-mail: cqullw@163.com
Received: 18 February 2022; Revised: 4 March 2022; Accepted: 10 March 2022; Available online: 11 March 2022

Abstract

Abstract

Two new low-alloyed Mg–2RE–0.8Mn–0.6Ca–0.5Zn (wt%, RE = Sm or Y) alloys are developed, which can be produced on an industrial scale via relatively high-speed extrusion. These two alloys are not only comparable to commercial AZ31 alloy in extrudability, but also have superior mechanical properties, especially in terms of yield strength (YS). The excellent extrudability is related to less coarse second-phase particles and high initial melting point of the two as-cast alloys. The high strength–ductility mainly comes from the formation of fine grains, nano-spaced submicron/nano precipitates, and weak texture. Moreover, it is worth noting that the YS of the two alloys can maintain above 160 MPa at elevated temperature of 250°C, significantly higher than that of AZ31 alloy (YS: 45 MPa). The Zn/Ca solute segregation at grain boundaries, the improved heat resistance of matrix due to addition of RE, and the high melting points of strengthening particles (Mn, MgZn₂, and Mg–Zn–RE/Mg–Zn–RE–Ca) are mainly responsible for the excellent high-temperature strength.
- magnesium alloys;
- high-speed extrusion;
- high strength;
- high ductility;
- solute segregation

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