Microstructure and strengthening mechanism of bimodal size particle reinforced magnesium matrix composite |
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| Authors: | Kunkun Deng Juyan Shi Cuiju Wang Xiaojun Wang Yewei Wu Kaibo Nie Kun Wu |
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| Affiliation: | 1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi''an Jiaotong University, Xi′an 710049, China;2. State Key Laboratory of Traction Power, School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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| Abstract: | One kind of (submicron + micron) bimodal size SiCp/AZ91 composite was fabricated by the stir casting technology. After hot deformation process, the influence of bimodal size particles on microstructures and mechanical properties of AZ91 matrix was investigated by comparing with monolithic A91 alloy, submicron SiCp/AZ91 and micron SiCp/AZ91 composites. The results show that micron particles can stimulate dynamic recrystallized nucleation, while submicron particles may pin grain boundaries during the hot deformation process, which results in a significant grain refinement of AZ91 matrix. Compared to submicron particles, micron particles are more conducive to grain refinement through stimulating the dynamic recrystallized nucleation. Besides, the yield strength of bimodal size SiCp/AZ91 composite is higher than that of single-size particle reinforced composites. Among the strengthening mechanisms of bimodal size particle reinforced composite, it is found that grain refinement and dislocation strengthening mechanism play a larger role on improving the yield strength. |
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