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Ni-Zr samples containing 41.2-43.0 at.% Zr were annealed at 700, 800, and 1000 °C and furnace cooled to examine the homogeneity range of Ni10Zr7 by means of x-ray diffraction and metallographic studies [2004Tak]. The result indicated that the homogeneity range of Ni10Zr7 is very narrow. Figure 1 shows the Ni-Zr phase diagram assessed by [1991Nas] with the Ni10Zr7 phase field as modified by [2004Tak]. In the original diagram, the width of the Ni10Zr7 phase was approximately 2.5 at.%. This result is consistent with the criterion given by [1993Oka] that a two-phase field becoming increasingly wider at higher temperatures is unlikely. In this regard, Ni5Zr and Ni3Zr may also have a narrow homogeneity range.
Ni-Zr phase diagram
References
Nash P., Jayanth C.S. (1991) Ni-Zr (Nickel-Zirconium). In: Nash P. (ed) Phase Diagrams of Binary Nickel Alloys. ASM International, Materials Park OH, pp 390-394
Okamoto H., Massalski T.B. (1993) Guidelines for Binary Phase Diagram Assessment. J. Phase Equilibria 14(3):316-335
Takeshita H.T., Kondo S., Miyamura H., Takeichi N., Kuriyama N., Oishi T. (2004) Re-examination of Zr7Ni10 Single Phase Region. J. Alloys Compounds 376:268-274
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Okamoto, H. Ni-Zr (Nickel-Zirconium). J Phs Eqil and Diff 28, 409 (2007). https://doi.org/10.1007/s11669-007-9120-z
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DOI: https://doi.org/10.1007/s11669-007-9120-z