Structure and Properties of Ni–Al Alloys in the Liquid State
- Authors: Tyagunov A.G.1, Baryshev E.E.1, Tyagunov G.V.1, Shmakova K.Y.1, Mushnikov V.S.1
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Affiliations:
- Ural Federal University
- Issue: Vol 2019, No 2 (2019)
- Pages: 139-141
- Section: Article
- URL: https://journals.rcsi.science/0036-0295/article/view/172954
- DOI: https://doi.org/10.1134/S0036029519020277
- ID: 172954
Cite item
Abstract
The structure and the properties of liquid Ni–Al alloys have been studied in a wide temperature range. An analysis of the temperature dependences of the physical and chemical properties of these alloys has discovered a hysteresis phenomenon, i.e., discrepancy between heating and cooling polytherms. This discrepancy is called the temperature hysteresis. A physical model of the Ni–Al alloy structure is proposed on the basis of a quasi-chemical model for a nonequilibrium melt structure. The liquid metal is found to be in a nonequilibrium state after melting. It contains NixAl-type microgroups with a strong Ni–Al bond and fcc-like structure and microgroups with weaker Ni–Ni bonds. The sizes and the life times of these clusters decrease after melting (above the liquidus temperature). The NixAl-type clusters disappear as the melt temperature becomes higher than a critical temperature. The melt transforms from a microinhomogeneous state into an equilibrium state.
Keywords
About the authors
A. G. Tyagunov
Ural Federal University
Email: e.e.baryshev@urfu.ru
Russian Federation, Yekaterinburg, 620002
E. E. Baryshev
Ural Federal University
Author for correspondence.
Email: e.e.baryshev@urfu.ru
Russian Federation, Yekaterinburg, 620002
G. V. Tyagunov
Ural Federal University
Email: e.e.baryshev@urfu.ru
Russian Federation, Yekaterinburg, 620002
K. Yu. Shmakova
Ural Federal University
Email: e.e.baryshev@urfu.ru
Russian Federation, Yekaterinburg, 620002
V. S. Mushnikov
Ural Federal University
Email: e.e.baryshev@urfu.ru
Russian Federation, Yekaterinburg, 620002
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