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Invited Review

Towards developing Mg alloys with simultaneously improved strength and ductility by refining grain via deformation process

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  • Received: 10 August 2020Revised: 6 September 2020Accepted: 8 September 2020Available online: 12 September 2020
  • Magnesium (Mg) alloys, as the lightest metal engineering materials, have a wide application prospect. However, the strength and ductility of traditional Mg alloys are still relativity low, especially it is difficult to be improved simultaneously. Refining grain size by deformation process is one of the feasible strategies to prepare Mg alloys with high strength and good ductility, based on the grain boundary strengthening and the transition of deformation mechanisms. In this review, effects of grain size on the strength and ductility of Mg alloys are summarized and the fine-grained Mg alloys with high strength and good ductility developed by various severe plastic deformation technologies and improved traditional deformation technologies are introduced. It is demonstrated that although some achievements have been made, effects of grain size on various Mg alloys are rarely discussed systematically and some key mechanisms are not clear, lacking of direct microscopic evidences. This review is expected to be helpful for further developing high-performance fine-grained Mg alloys.
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Towards developing Mg alloys with simultaneously improved strength and ductility by refining grain via deformation process

  • Corresponding authors:

    Jing-huai Zhang    E-mail: zhangjinghuai@hrbeu.edu.cn

    Shu-juan Liu    E-mail: liusj0817@hit.edu.cn

    Kai Guan    E-mail: guankai129@163.com

  • 1. Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
  • 2. Ningbo Branch, Ordnance Science Institute of China, Ningbo 315103, China
  • 3. Department of Materials Physics and Chemistry, Harbin Institute of Technology, Harbin 150001, China

Abstract: Magnesium (Mg) alloys, as the lightest metal engineering materials, have a wide application prospect. However, the strength and ductility of traditional Mg alloys are still relativity low, especially it is difficult to be improved simultaneously. Refining grain size by deformation process is one of the feasible strategies to prepare Mg alloys with high strength and good ductility, based on the grain boundary strengthening and the transition of deformation mechanisms. In this review, effects of grain size on the strength and ductility of Mg alloys are summarized and the fine-grained Mg alloys with high strength and good ductility developed by various severe plastic deformation technologies and improved traditional deformation technologies are introduced. It is demonstrated that although some achievements have been made, effects of grain size on various Mg alloys are rarely discussed systematically and some key mechanisms are not clear, lacking of direct microscopic evidences. This review is expected to be helpful for further developing high-performance fine-grained Mg alloys.

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