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Revealing the Selection of σ and μ Phases in CoCrFeNiMox High Entropy Alloys by CALPHAD

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Abstract

Though the strengthening effect of σ and μ phases in CoCrFeNiMox high entropy alloys has been confirmed, the selection of these two phases remains unclear, which restricts the further strengthening design. In this study, microstructures and phase compositions of CoCrFeNiMox (x = 0.1, 0.2, 0.3, 0.4, and 0.5) alloys were investigated through annealing at 600, 750, 900, 1000 °C for 7 days and 1080 °C for 3 days, respectively. Based on the experiment results, a (CoCrFeNi)-Mo phase selection diagram was drawn and compared with the calculated isopleth phase diagram of (CoCrFeNi)-Mo. The results indicate that the selection of σ and μ phases depends on the content of Mo greatly. Due to the limited prediction of phase selection and transformation by the isopleth phase diagram of (CoCrFeNi)-Mo, we design a (CoFeNi)-Mo-Cr isothermal phase diagram to reveal the transformation between σ and μ phases and their selections.

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Acknowledgments

The work was supported by National Natural Science foundation of China (Grant Nos. 51471133 and 51771149). FH thanks Excellent Doctorate Foundation of Northwestern Polytechnical University (Grant No. CX201805) for the finical support.

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Authors and Affiliations

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

    Qingfeng Wu, Zhijun Wang, Feng He, Junjie Li & Jincheng Wang

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  1. Qingfeng Wu
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  2. Zhijun Wang
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  3. Feng He
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Correspondence to Zhijun Wang or Jincheng Wang.

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Wu, Q., Wang, Z., He, F. et al. Revealing the Selection of σ and μ Phases in CoCrFeNiMox High Entropy Alloys by CALPHAD. J. Phase Equilib. Diffus. 39, 446–453 (2018). https://doi.org/10.1007/s11669-018-0659-7

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  • DOI: https://doi.org/10.1007/s11669-018-0659-7

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