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Measurement of 900 °C Isothermal Section in the Mo-Ni-Zr System

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Abstract

The isothermal section of the Mo-Ni-Zr system at 900 °C was investigated by characterization of eighteen equilibrium alloys. Electron probe microanalysis (EPMA) and x-ray diffraction (XRD) were used to identify the phases and obtain their compositions. The existence of two ternary compounds, Zr65Mo18−x Ni16.5+x (τ1, cF96-Ti2Ni) and Zr65Mo27.3Ni7.7 (τ2, hP28-Hf9Mo4B), was confirmed in the Zr-rich corner, and the compositions of the two phases were determined. The isothermal section of the Mo-Ni-Zr system at 900 °C consists of 15 three-phase regions and 29 two-phase regions. The following three-phase equilibria were well established: (1) (Ni) + Ni7Zr2 + Ni5Zr, (2) MoNi + MoNi3 + Ni7Zr2, (3) Ni7Zr2 + MoNi + (Mo), (4) (Mo) + Ni7Zr2 + Ni3Zr, (5) (Mo) + Ni3Zr + Ni21Zr8, (6) (Mo) + Ni21Zr8 + Ni10Zr7, (7) (Mo) + Ni10Zr7 + NiZr, (8) (Mo) + Mo2Zr + NiZr, (9) NiZr2 + Mo2Zr + τ1, (10) τ1 + Mo2Zr + τ2, (11) τ2 + Mo2Zr + (Zr)ht, (12) NiZr2 + τ1 + (Zr)ht and (13) τ1 + τ2 + (Zr)ht. Several binary phases, such as MoNi3, Ni7Zr2 and Mo2Zr, dissolve appreciable amount of the third component.

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Acknowledgments

The financial supports from the National Natural Science Foundation of China (Grant No. 51371199), Ministry of Industry and Information Technology of China (Grant No. 2015ZX04005008) and Project of Innovation-driven Plan in Central South University (Grant No. 2015CX004) are greatly acknowledged.

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Authors and Affiliations

  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, Hunan, People’s Republic of China

    Shimin Wang, Cong Zhang, Chaoying Lin & Yong Du

  2. Sino-German Microstructure Cooperation Group, Central South University, Changsha, 410083, Hunan, People’s Republic of China

    Shimin Wang, Cong Zhang, Chaoying Lin & Yong Du

  3. School of Metallurgical Engineering, Hunan University of Technology, Zhuzhou, 412008, Hunan, People’s Republic of China

    Yingbiao Peng

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  1. Shimin Wang
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Correspondence to Yong Du.

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Wang, S., Zhang, C., Lin, C. et al. Measurement of 900 °C Isothermal Section in the Mo-Ni-Zr System. J. Phase Equilib. Diffus. 37, 672–679 (2016). https://doi.org/10.1007/s11669-016-0495-6

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  • DOI: https://doi.org/10.1007/s11669-016-0495-6

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