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Research Article

Microstructure evolution and mechanical properties of Mg-9Al-1Si-1SiC composites processed by multi-pass equal-channel angular pressing at various temperatures

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  • Received: 22 April 2020Revised: 30 May 2020Accepted: 18 June 2020Available online: 21 June 2020
  • In this study, Mg-9Al-1Si-1SiC (wt%) composites were processed by multi-pass equal-channel angular pressing (ECAP) at various temperatures, and the microstructure evolution and strengthening mechanism were explored. The results indicate that the as-cast microstructure was composed of an α-Mg matrix, discontinuous Mg17Al12 phase, and Chinese script-shaped Mg2Si phase. After solution treatment, almost all of the Mg17Al12 phases are dissolved into the matrix, while the Mg2Si phases are not. The subsequent multi-pass ECAP at different temperatures results in more complete dynamic recrystallization and uniform distribution of Mg17Al12 precipitates when compared with the multi-pass ECAP at a constant temperature. A large number of precipitates can effectively improve the nucleation ratio of recrystallization through a particle-stimulated nucleation mechanism. In addition, the nano-scale SiC particles are mainly distributed at grain boundaries, which can effectively prevent dislocation movement. The excellent comprehensive mechanical properties are mainly attributed to grain boundary strengthening and Orowan strengthening.
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    [2] Xiao-feng Wang, Ming-xing Guo, Cun-qiang Ma, Jian-bin Chen, Ji-shan Zhang, and  Lin-zhong Zhuang, Effect of particle size distribution on the microstructure, texture, and mechanical properties of Al–Mg–Si–Cu alloy, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-018-1645-0
    [3] Chong Lin, Shu-sen Wu, Shu-lin Lü, Ping An, and  He-bao Wu, Effects of high-pressure rheo-squeeze casting on the Fe-rich phases and mechanical properties of Al-17Si-(1,1.5)Fe alloys, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-018-1652-1
    [4] Dong-tao Wang, Hai-tao Zhang, Lei Li, Hai-lin Wu, Ke Qin, and  Jian-zhong Cui, The evolution of microstructure and mechanical properties during high-speed direct-chill casting in different Al-Mg2Si in situ composites, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-018-1659-7
    [5] M. H. Farshidi, M. Rifai, and  H. Miyamoto, Microstructure evolution of a recycled Al-Fe-Si-Cu alloy processed by tube channel pressing, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-018-1668-6
    [6] Zhi-hao Zhang, Jie Xue, Yan-bin Jiang, and  Feng Jin, Effect of pre-annealing treatment on the microstructure and mechanical properties of extruded Al-Zn-Mg-Cu alloy bars, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-017-1521-3
    [7] Chun-duo Dai, Rui-na Ma, Wei Wang, Xiao-ming Cao, and  Yan Yu, Microstructure and properties of an Al-Ti-Cu-Si brazing alloy for SiC-metal joining, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-017-1437-y
    [8] Zhi-yong Xue, Yue-juan Ren, Wen-bo Luo, Yu Ren, Ping Xu, and  Chao Xu, Microstructure evolution and mechanical properties of a large-sized ingot of Mg-9Gd-3Y-1.5Zn-0.5Zr (wt%) alloy after a lower-temperature homogenization treatment, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-017-1405-6
    [9] Z. M. Sheggaf, R. Ahmad, M. B. A. Asmael, and  A. M. M. Elaswad, Solidification, microstructure, and mechanical properties of the as-cast ZRE1 magnesium alloy with different praseodymium contents, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-017-1523-1
    [10] Lavish Kumar Singh, Alok Bhadauria, Amirthalingam Srinivasan, Uma Thanu Subramonia Pillai, and  Bellambettu Chandrasekhara Pai, Effects of gadolinium addition on the microstructure and mechanical properties of Mg-9Al alloy, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-017-1476-4
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Microstructure evolution and mechanical properties of Mg-9Al-1Si-1SiC composites processed by multi-pass equal-channel angular pressing at various temperatures

  • Corresponding author:

    Hong-xia Wang    E-mail: wanghxia1217@163.com

  • 1. Shanxi Key Laboratory of Advanced Magnesium based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • 2. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China

Abstract: In this study, Mg-9Al-1Si-1SiC (wt%) composites were processed by multi-pass equal-channel angular pressing (ECAP) at various temperatures, and the microstructure evolution and strengthening mechanism were explored. The results indicate that the as-cast microstructure was composed of an α-Mg matrix, discontinuous Mg17Al12 phase, and Chinese script-shaped Mg2Si phase. After solution treatment, almost all of the Mg17Al12 phases are dissolved into the matrix, while the Mg2Si phases are not. The subsequent multi-pass ECAP at different temperatures results in more complete dynamic recrystallization and uniform distribution of Mg17Al12 precipitates when compared with the multi-pass ECAP at a constant temperature. A large number of precipitates can effectively improve the nucleation ratio of recrystallization through a particle-stimulated nucleation mechanism. In addition, the nano-scale SiC particles are mainly distributed at grain boundaries, which can effectively prevent dislocation movement. The excellent comprehensive mechanical properties are mainly attributed to grain boundary strengthening and Orowan strengthening.

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