| 粉末冶金法制备混杂增强铜基复合材料的增强体竞争析出行为研究 |
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| 作者姓名： | Tao Lan Yi-hui Jiang Xiao-jun Zhang Fei Cao Shu-hua Liang |
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| 作者单位： | Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology, Xi’an University of Technology, Xi’an 710048, China |
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| 摘 要： | Copper matrix composites reinforced by in situ-formed hybrid titanium boride whiskers (TiBw) and titanium diboride particles (TiB2p) were fabricated by powder metallurgy. Microstructural observations showed competitive precipitation behavior between TiBw and TiB2p, where the relative contents of the two reinforcements varied with sintering temperature. Based on thermodynamic and kinetic assessments, the precipitation mechanisms of the hybrid reinforcements were discussed, and the formation of both TiBw and TiB2p from the local melting zone was thermodynamically favored. The precipitation kinetics were mainly controlled by a solid-state diffusion of B atoms. By forming a compact compound layer, in situ reactions were divided into two stages, where Zener growth and Dybkov growth prevailed, respectively. Accordingly, the competitive precipitation behavior was attributed to the transition of the growth model during the reaction process.
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| 关 键 词： | ,,,,, |
Competitive precipitation behavior of hybrid reinforcements in copper matrix composites fabricated by powder metallurgy |
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| Tao Lan,Yi-hui Jiang,Xiao-jun Zhang,Fei Cao,Shu-hua Liang.Competitive precipitation behavior of hybrid reinforcements in copper matrix composites fabricated by powder metallurgy[J].International Journal of Minerals,Metallurgy and Materials,2021,28(6):1090-1096. |
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| Authors: | Tao Lan Yi-hui Jiang Xiao-jun Zhang Fei Cao Shu-hua Liang |
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| Abstract: | Copper matrix composites reinforced by in situ-formed hybrid titanium boride whiskers (TiBw) and titanium diboride particles (TiB2p) were fabricated by powder metallurgy. Microstructural observations showed competitive precipitation behavior between TiBw and TiB2p, where the relative contents of the two reinforcements varied with sintering temperature. Based on thermodynamic and kinetic assessments, the precipitation mechanisms of the hybrid reinforcements were discussed, and the formation of both TiBw and TiB2p from the local melting zone was thermodynamically favored. The precipitation kinetics were mainly controlled by a solid-state diffusion of B atoms. By forming a compact compound layer, in situ reactions were divided into two stages, where Zener growth and Dybkov growth pre-vailed, respectively. Accordingly, the competitive precipitation behavior was attributed to the transition of the growth model during the reac-tion process. |
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| Keywords: | metal matrix composite hybrid reinforcement in situ reaction growth kinetics |
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