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

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International Journal of Minerals, Metallurgy and Materials Aims and scope Submit manuscript

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.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 52071093 and 51871069), the Key Laboratory of Micro-Systems and Micro-Structures Manufacturing (HIT), Ministry of Education (No. 2020 KM009), the Student Research and Innovation Fund of the Fundamental Research Funds for the Central Universities (No. 3072022GIP1004), and the Science and Technology Innovation Major Project of Ningbo City, China (No. 2019B10103).

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Authors and Affiliations

  1. Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China

    Jinshu Xie, Zhi Zhang, Jinghuai Zhang, Yuying He, Yunlei Jiao & Ruizhi Wu

  2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Shujuan Liu

  3. Ningbo Branch, Ordnance Science Institute of China, Ningbo, 315103, China

    Jun Wang

  4. School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China

    Liwei Lu

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  1. Jinshu Xie
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Correspondence to Jinghuai Zhang, Jun Wang or Liwei Lu.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Xie, J., Zhang, Z., Liu, S. et al. Designing new low alloyed Mg—RE alloys with high strength and ductility via high-speed extrusion. Int J Miner Metall Mater 30, 82–91 (2023). https://doi.org/10.1007/s12613-022-2472-x

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  • DOI: https://doi.org/10.1007/s12613-022-2472-x

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