Competitive precipitation behavior of hybrid reinforcements in copper matrix composites fabricated by powder metallurgy

Tao Lan; Yi-hui Jiang; Xiao-jun Zhang; Fei Cao; Shu-hua Liang

doi:10.1007/s12613-020-2052-x

Volume 28 Issue 6

Jun. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(6): 1090-1096

Tao Lan, Yi-hui Jiang, Xiao-jun Zhang, Fei Cao, and Shu-hua Liang, Competitive precipitation behavior of hybrid reinforcements in copper matrix composites fabricated by powder metallurgy, Int. J. Miner. Metall. Mater., 28(2021), No. 6, pp. 1090-1096. https://doi.org/10.1007/s12613-020-2052-x

Cite this article as:

Tao Lan, Yi-hui Jiang, Xiao-jun Zhang, Fei Cao, and Shu-hua Liang, Competitive precipitation behavior of hybrid reinforcements in copper matrix composites fabricated by powder metallurgy, Int. J. Miner. Metall. Mater., 28(2021), No. 6, pp. 1090-1096. https://doi.org/10.1007/s12613-020-2052-x

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Research Article

Competitive precipitation behavior of hybrid reinforcements in copper matrix composites fabricated by powder metallurgy

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Corresponding authors:
Yi-hui Jiang E-mail: jiangyihui@xaut.edu.cn

Shu-hua Liang E-mail: liangsh@xaut.edu.cn
Received: 18 December 2019; Revised: 22 March 2020; Accepted: 26 March 2020; Available online: 29 March 2020

Abstract

Abstract

Copper matrix composites reinforced by in situ-formed hybrid titanium boride whiskers (TiB_w) and titanium diboride particles (TiB_2p) were fabricated by powder metallurgy. Microstructural observations showed competitive precipitation behavior between TiB_w and TiB_2p, 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 TiB_w and TiB_2p 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.
- metal matrix composite;
- hybrid reinforcement;
- in situ reaction;
- growth kinetics

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