Grain refinement and strength enhancement in Mg wrought alloys: A review  

作　　者：Sen Wang Hucheng Pan Dongsheng Xie Dongdong Zhang Jingren Li Hongbo Xie Yuping Ren Gaowu Qin 

机构地区：[1]Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),College of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [2]Liaoning Academy of Materials,Institute of Materials Planification,Shenyang 110167,China

出　　处：《Journal of Magnesium and Alloys》2023年第11期4128-4145,共18页镁合金学报（英文）

基　　金：supported by National Key Research and Development Program of China (No.2023YFB3710900);National Natural Science Foundation of China (Nos.U2241235,U2167213,51971053);funded by the Project of Promoting Talents in Liaoning province (No.XLYC2203202);the financial assistance from Young Elite Scientists Sponsorship Program by CAST (2019-2021QNRC001,2019-2021QNRC002,2019-2021QNRC003);the fund from the Fundamental Research Funds for the Central Universities (N2202020)。

摘　　要：Low absolute strength becomes one major obstacle for the wider applications of low/no rare-earth(RE) containing Mg alloys. This review firstly demonstrates the importance of grain refinement in improving strength of Mg alloys by comprehensively comparing with other strategy, e.g., precipitation strengthening. Dynamic recrystallization(DRX) plays a crucial role in refining grain size of Mg wrought alloys.Therefore, secondly, the DRX models, grain nucleation mechanisms and the related grain refinement abilities in Mg alloys are summarized,including phase boundary, twin boundary and general boundary induced recrystallization. Thirdly, the newly developed low-RE containing Mg alloy, e.g., Mg-Ce, Mg-Nd and Mg-Sm based alloys, and the RE-free Mg alloys, e.g., Mg-Al, Mg-Zn, Mg-Sn and Mg-Ca based alloy,are reviewed, with the focus on enhancing the mechanical properties mainly via the grain refinement strategy. At the last section, the perspectives and outstanding issues concerning high-performance Mg wrought alloys are also proposed. This review is meant to promote the deep understanding on the critical role of grain refinement in Mg alloys and provide reference for the development of other high strength and low-cost Mg alloys which are fabricated by the conventional extrusion/rolling processing.

关 键 词：Magnesium alloy Grain refinement Strengthening Dynamic recrystallization Microstructure control 

分 类 号：TG146.22[一般工业技术—材料科学与工程]