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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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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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