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

Xiang-peng Zhang; Hong-xia Wang; Li-ping Bian; Shao-xiong Zhang; Yong-peng Zhuang; Wei-li Cheng; Wei Liang

doi:10.1007/s12613-020-2123-z

Volume 28 Issue 12

Dec. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(12): 1966-1975

Xiang-peng Zhang, Hong-xia Wang, Li-ping Bian, Shao-xiong Zhang, Yong-peng Zhuang, Wei-li Cheng, and Wei Liang, Microstructure evolution and mechanical properties of Mg–9Al–1Si–1SiC composites processed by multi-pass equal-channel angular pressing at various temperatures, Int. J. Miner. Metall. Mater., 28(2021), No. 12, pp. 1966-1975. https://doi.org/10.1007/s12613-020-2123-z

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Xiang-peng Zhang, Hong-xia Wang, Li-ping Bian, Shao-xiong Zhang, Yong-peng Zhuang, Wei-li Cheng, and Wei Liang, Microstructure evolution and mechanical properties of Mg–9Al–1Si–1SiC composites processed by multi-pass equal-channel angular pressing at various temperatures, Int. J. Miner. Metall. Mater., 28(2021), No. 12, pp. 1966-1975. https://doi.org/10.1007/s12613-020-2123-z

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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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Corresponding author:
Hong-xia Wang E-mail: wanghxia1217@163.com
Received: 21 April 2020; Revised: 30 May 2020; Accepted: 17 June 2020; Available online: 21 June 2020

Abstract

Abstract

In this study, Mg–9Al–1Si–1SiC (wt%) composites were processed by multi-pass equal-channel angular pressing (ECAP) at various temperatures, and their microstructure evolution and strengthening mechanism were explored. Results showed 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 were dissolved into the matrix, whereas the Mg₂Si phases were not. The subsequent multi-pass ECAP at different temperatures promoted the dynamic recrystallization and uniform distribution of the 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 SiC nanoparticles were mainly distributed at grain boundaries, which effectively prevented dislocation movement. The excellent comprehensive mechanical properties can be attributed to grain boundary strengthening and Orowan strengthening.
- magnesium alloy;
- multi-temperature ECAP processing;
- Mg₂Si;
- mechanical property

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