Abstract
The Ni–Ni5Zr eutectic alloy becomes a promising structural material owing to its high strength and desirable plasticity. However, those nominal eutectic alloys with previously assumed compositions of Ni-8.8 at.% Zr and Ni-9.0 at.% Zr were found to involve a considerable amount of primary (Ni) phase. Hereby, an experimental study was conducted by differential scanning calorimetry and careful electron microscopy to clarify the situation. A total of 13 alloys in the composition range of 8.8 ~ 11.0 at.% Zr were explored with respect to their phase transition temperatures and microstructure evolution characteristics. The Ni-9.9 at.% Zr alloy exhibited primary (Ni) phase, whereas the Ni-10.1 at.% Zr alloy displayed primary Ni5Zr phase. Finally, the eutectic point was determined as Ni-10.0 at.% Zr alloy with a transition temperature of 1467 K, and the relevant part of Ni–Zr phase diagram was revised accordingly.
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Acknowledgments
The authors are grateful to Mr. C.H. Zheng, Mr. B. Zhai, Mr. Z.C. Luo and Mr. C. Liang for their help.
Funding
This work is financially supported by the National Natural Science Foundation of China (Grant Nos. 51734008 and 51327901), the National Key R&D Program of China (Grant No. 2018YFB2001800) and the Shannxi Key Industry Chain Program (Grant No. 2019ZDLGY05-10).
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Wang, Q., Wang, H.P., Geng, D.L. et al. Experimental determination of the Ni–Ni5Zr eutectic point for binary Ni–Zr alloy phase diagram. Appl. Phys. A 126, 375 (2020). https://doi.org/10.1007/s00339-020-03569-4
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DOI: https://doi.org/10.1007/s00339-020-03569-4