Study of the properties of the Heusler alloy Ni-Mn-Ga-Cu systems in different structural states
A.I. Ivanova1, A.Yu.. Karpenkov1, E.M. Semenova1, I.I. Musabirov2
1 Tver State University
2 Institute for Metals Superplasticity Problems of the RAS
DOI: 10.26456/pcascnn/2025.17.067
Original article
Abstract: The paper presents the results of studying the microstructure, the magnetic domain structure and some magnetic properties of NiMnGaCu alloy samples in initial and deformed states. It has been shown that carrying out deformation-thermal treatment, including homogenizing annealing, extrusion with subsequent vacuum annealing, contributes to a change in the microstructure of the initial alloy (reduction in the size of crystallites and martensitic plates). Magnetic domains on the surface of the samples were visualized by magnetic force microscopy, and a substructure of secondary microtwins with their own magnetic domain structure was revealed. A study of the field dependences of the magnetization of the initial and deformation-heat-treated samples allows us to conclude that both samples have the same saturation magnetization value. Magnetometric measurements demonstrate an insignificant shift in the phase transition temperature towards lower temperatures for the deformed sample. The maximum values in the temperature dependences of the magnetocaloric effect for the original and deformed samples strictly correspond to phase transitions.
Keywords: Heusler alloys, martensitic relief, deformation-thermal treatment, extrusion, micro- and nanostructure, magnetic domain structure, magnetostructural transition
- Alexandra I. Ivanova – Ph. D., Docent, Applied Physic Department, Tver State University
- Aleksey Yu.. Karpenkov – Ph. D., Head of Condensed Matter Physics Department, Tver State University
- Elena M. Semenova – Ph. D., Docent, Condensed Matter Physics Department, Tver State University
- Irek I. Musabirov – Ph. D., Senior Researcher, Institute for Metals Superplasticity Problems of the RAS
For citation:
Ivanova A.I., Karpenkov A.Yu.., Semenova E.M., Musabirov I.I. Issledovanie svojstv splava Gejslera cistemy Ni-Mn-Ga-Cu v razlichnom strukturnom sostoyanii [Study of the properties of the Heusler alloy Ni-Mn-Ga-Cu systems in different structural states], Fiziko-khimicheskie aspekty izucheniya klasterov, nanostruktur i nanomaterialov [Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials], 2025, issue 17, pp. 067-076. DOI: 10.26456/pcascnn/2025.17.067. ⎘
Full article (in Russian): download PDF file
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