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Some discussion topics on the representation of the equilibrium Fe—Ni phase diagram and on the nature of the invar effect


Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, ul. S Kovalevskoi 18, Ekaterinburg, 620219, Russian Federation

This paper presents an analysis of the Fe—Ni phase diagrams published over the last 50 years. It is shown that the differences in the low-temperature part of the phase diagram and in the explanation of the nature of invar alloys are due to the lack of clear experimental evidence for the absence or occurrence of a superstructure with less than 50% Ni content. The experimental results obtained in this work favor a certain particular phase diagram yet unpublished in the reference literature and suggest the possible nature of invar effect. The phase diagram analysis and the assumption on the nature of the invar effects are based on results obtained by structural methods.

Text can be downloaded in Russian. English translation is available here.
Keywords: text Fe!-!Ni<$> diagram, invar effect, microdomains, discontinuous coagulation, discontinuous decomposition, reverse α → γ transformation
PACS: 61.50.ks, 61.66.Dk, 64.70.K− (all)
DOI: 10.3367/UFNe.2018.02.038298
URL: https://ufn.ru/en/articles/2018/10/e/
Citation: Zemtsova N D "Some discussion topics on the representation of the equilibrium Fe—Ni phase diagram and on the nature of the invar effect" Phys. Usp. 61 1000–1015 (2018)
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Received: 4th, July 2017, 14th, February 2018

Оригинал: Земцова Н Д «К дискуссии по вопросам представления равновесной фазовой диаграммы Fe—Ni и природы инварного эффекта» УФН 188 1103–1118 (2018); DOI: 10.3367/UFNr.2018.02.038298

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