Influence of the initial composition on the phase equilibria in the case of the solid phase separation in binary alloy nanoparticles (exemplifying on the W-Cr system)
A.V. Shishulin1, A.V. Shishulina2
1 PleiadesPubl., Ltd
2 R.E. Alekseev Nizhny Novgorod State Technical University
DOI: 10.26456/pcascnn/2023.15.299
Short communication
Abstract: Due to a unique set of physico-chemical properties, nanoparticle-fabricated heavy tungstenpseudo-alloys with the ultrafine-grained structure have become an object of a strong interest among researchers in the case of the up-to-date additive powder metallurgy technologies. In this paper, the peculiarities of the phase composition have been simulated in the framework of a thermodynamic approach to core-shell nanoparticles of a stratifying sold solution using the heavy W-Cr pseudo-alloy as an example. For a two-component system with the phase separation in the solid state, a specific effect has been demonstrated which consists in the fact that, unlike system in the macroscopic state, it is not only the volume fraction of co-existing phases but also their equilibrium composition varies depending on the initial composition of a the system. For two different heterogeneous states of a coreshell structure, the thermal stability areas have been obtained along with temperature-dependent equilibrium phase compositions of the system in each state. A thermodynamic interpretation of the obtained results has been described based on three possible mechanisms of reducing the free energy of the system.
Keywords: nanoparticles, phase separation, chemical thermodynamics, solubility, core-shell, tungsten, chromium
- Alexander V. Shishulin – Ph.D., PleiadesPubl., Ltd
- Anna V. Shishulina – Ph.D., Associate Professor, R.E. Alekseev Nizhny Novgorod State Technical University
Reference:
Shishulin, A.V. Influence of the initial composition on the phase equilibria in the case of the solid phase separation in binary alloy nanoparticles (exemplifying on the W-Cr system) / A.V. Shishulin, A.V. Shishulina // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. — 2023. — I. 15. — P. 299-307. DOI: 10.26456/pcascnn/2023.15.299. (In Russian).
Full article (in Russian): download PDF file
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