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

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  • Received: 18 December 2019Revised: 22 March 2020Accepted: 26 March 2020Available online: 29 March 2020
  • Copper matrix composites reinforced by in situ-formed hybrid TiB whiskers and TiB2 particles were fabricated by powder metallurgy. Microstructure observations showed that there was a 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 TiB whiskers and TiB2 particles 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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Competitive precipitation behavior of hybrid reinforcements in copper matrix composites fabricated by powder metallurgy

  • Corresponding authors:

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

    Shu-hua Liang    E-mail: liangsh@xaut.edu.cn

  • Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology, Xi’an University of Technology, Xi’an 710048, China

Abstract: Copper matrix composites reinforced by in situ-formed hybrid TiB whiskers and TiB2 particles were fabricated by powder metallurgy. Microstructure observations showed that there was a 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 TiB whiskers and TiB2 particles 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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