Experimental determination of the Ni–Ni5Zr eutectic point for binary Ni–Zr alloy phase diagram

Q. Wang, H. P. Wang, D. L. Geng, B. Wei

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3 Scopus citations

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.

Original languageEnglish
Article number375
JournalApplied Physics A: Materials Science and Processing
Volume126
Issue number5
DOIs
StatePublished - 1 May 2020

Keywords

  • Differential scanning calorimetry
  • Eutectic alloy
  • Metallic systems
  • Ni–Zr alloy
  • Phase diagram

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