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Phase Equilibria in the Co-W-Zr Ternary System at 1200 and 1300 °C

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Abstract

The phase equilibria in the Co-W-Zr ternary system at 1200 and 1300 °C were experimentally investigated by electron probe microanalysis and x-ray diffraction. Totally eight three-phase and seven three-phase regions were confirmed in the 1200 and 1300 °C isothermal sections, respectively. There are two small Liquid regions at 1300 °C, but only one was found at 1200 °C. The Co11Zr2 phase was found at 1200 °C, and dissolved at 1300 °C. The solubility limit of Zr in the (αCo) is about 1.0 at.% at 1200 °C and 3.0 at.% at 1300 at.% and too much Zr addition in Co-based alloys may introduce the Co11Zr2, Co23Zr6 or Co2Zr_Laves phases. The addition of W in the (αCo) should be less than 14.9 at.% at 1200 °C and 15.8 at.% at 1300 °C to prevent the brittle Co7W6 phase.

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Acknowledgments

This work was supported by the National Key R&D Program of China (Grant No. 2017YFB0702901) and the National Natural Science Foundation of China (Grant No. 51831007).

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Authors and Affiliations

  1. College of Materials and Fujian Provincial Key Laboratory of Materials Genome, Xiamen University, Xiamen, 361005, People’s Republic of China

    Xingjun Liu, Chenbin Luo, Shuiyang Yang, Jinbin Zhang, Yixiong Huang, Jiajia Han, Yong Lu & Cuiping Wang

  2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Xingjun Liu

  3. Institute of Materials Genome and Big Data, Harbin Institute of Technology, Shenzhen, 518055, People’s Republic of China

    Xingjun Liu & Mujing Yang

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  1. Xingjun Liu
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Contributions

Conceptualization, XL and CW; Funding acquisition, XL and CW; Investigation, CL, JZ, YH, JH and YL; Supervision, XL and CW; Writing—original draft, CL; Writing—review and editing, SY and MY.

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Correspondence to Cuiping Wang.

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Liu, X., Luo, C., Yang, M. et al. Phase Equilibria in the Co-W-Zr Ternary System at 1200 and 1300 °C. J. Phase Equilib. Diffus. 41, 3–14 (2020). https://doi.org/10.1007/s11669-019-00773-5

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