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Erschienen in: Physics of Metals and Metallography 11/2023

01.11.2023 | STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION

Phase Stability of Ni–(Co)–Mn–Z Heusler Alloys (Z = Ga, In, Sb, Sn)

verfasst von: K. R. Erager, V. V. Sokolovskiy, V. D. Buchelnikov, A. G. Gamzatov, A. M. Aliev

Erschienen in: Physics of Metals and Metallography | Ausgabe 11/2023

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Abstract

First-principles studies on phase stability and resistance with respect to the segregation of austenitic and martensitic phases of Ni2 – xCoxMn1 + yZ1 – y Heusler alloys (x = 0, 0.25, 0.5 and y = 0, 0.25, 0.5, 0.75; Z = Ga, In, Sb, Sn) with different types of magnetic ordering. Among all the considered compounds, the stability has been demonstrated only by the Ni1.5Co0.5MnGa and Ni2MnGa alloys in the cubic and tetragonal structures having a ferromagnetic ordering, respectively, as well as by Ni2Mn2 in the tetragonal structure with a staggered and layer-by-layer AFM ordering. For the case of these compositions, the presence of zero energy of the convex hull, as well as the absence of reactions with positive decomposition energy has been shown. The remaining compounds appear to be metastable, both owing to the presence of stable reactions with negative decomposition energy, and decomposition reactions with positive decomposition energy. The number of decomposition reactions exhibits an increase with increasing chemical disorder, i.e., with deviations from stoichiometry.

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Metadaten
Titel
Phase Stability of Ni–(Co)–Mn–Z Heusler Alloys (Z = Ga, In, Sb, Sn)
verfasst von
K. R. Erager
V. V. Sokolovskiy
V. D. Buchelnikov
A. G. Gamzatov
A. M. Aliev
Publikationsdatum
01.11.2023
Verlag
Pleiades Publishing
Erschienen in
Physics of Metals and Metallography / Ausgabe 11/2023
Print ISSN: 0031-918X
Elektronische ISSN: 1555-6190
DOI
https://doi.org/10.1134/S0031918X23601786

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