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. https://doi.org/10.1007/s12613-020-2123-z
Cite this article as:
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. https://doi.org/10.1007/s12613-020-2123-z
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. https://doi.org/10.1007/s12613-020-2123-z
Citation:
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. https://doi.org/10.1007/s12613-020-2123-z
Microstructure evolution and mechanical properties of Mg-9Al-1Si-1SiC composites processed by multi-pass equal-channel angular pressing at various temperatures
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
Received: 22 April 2020; Revised:
30 May 2020; Accepted:
18 June 2020; Available 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.