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Phase selection of titanium boride in copper matrix composites during solidification

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Abstract

In situ TiB whisker and TiB2 particle hybrid reinforced copper matrix composites were fabricated by vacuum induction melting. The phase constitution of the composites varies with their chemical composition. Thermodynamic and kinetic assessments were used to analyze the phase selection of titanium borides during solidification. The precipitations of TiB whisker and TiB2 particle from Cu–Ti–B liquids are both thermodynamically favored, and the phase selection is thus controlled by the competition of nucleation and growth kinetics between the two titanium borides. For the case of the three liquids studied in this work, the nucleation conditions are satisfied except for the formation of TiB in Cu–2at.%Ti–4at.%B liquid. With the change of chemical composition, the growth rate is altered rapidly for TiB, but remains nearly unchanged for TiB2.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. U1502274 and 51501149); the Pivot Innovation Team of Shaanxi Electric Materials and Infiltration Technique (Grant No. 2012KCT-25); and the Shaanxi Key Laboratory Program (Grant No. 16JS063).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an, 710048, Shaanxi, China

    Yihui Jiang, Dan Li, Shuhua Liang & Juntao Zou

  2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, China

    Feng Liu

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  1. Yihui Jiang
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  2. Dan Li
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  3. Shuhua Liang
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  4. Juntao Zou
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  5. Feng Liu
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Correspondence to Yihui Jiang or Shuhua Liang.

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Jiang, Y., Li, D., Liang, S. et al. Phase selection of titanium boride in copper matrix composites during solidification. J Mater Sci 52, 2957–2963 (2017). https://doi.org/10.1007/s10853-016-0592-2

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