Abstract
The martensitic and magnetic transformations, as well as the mechanical properties, of Ni₂MnAl alloys in as-cast (AC) and heat-treated (HT) conditions were investigated. Magnetic-field-induced strain was evaluated via magnetostriction, with reversible strains of 0.14% and 0.2% achieved in the martensitic phase at 2 K for the AC and HT alloys, respectively. Transformation temperatures and Curie temperatures were determined under constant applied magnetic field, revealing that γ-phase inclusions in the AC microstructure suppress antiferromagnetic domain response, yielding a lower magnetization (∼8.4 emu g⁻¹) compared to the HT alloy (∼13.4 emu g⁻¹). Both alloys exhibited hysteretic behavior in the martensitic state and a linear, paramagnetic response in the austenitic state. Mechanical testing showed predominantly brittle fracture in the AC alloy, while the HT alloy displayed a yield point and Lüders band behavior, indicating limited ductility. Ultimate tensile strength, yield strength, fracture strain, and hardness were quantified for both conditions, demonstrating the combined influence of microstructure, magnetic response, and mechanical behavior. These results highlight Ni₂MnAl as a promising candidate for magnetic-field-controlled shape memory applications, with tunable mechanical and functional properties via heat treatment.
Recommended Citation
C. J. Daches et al., "Magnetic Field-induced Transformation in Polycrystalline Ni2MnAl Heusler Type Magnetic Shape Memory Alloy," Next Materials, vol. 12, article no. 102230, Elsevier, Jul 2026.
The definitive version is available at https://doi.org/10.1016/j.nxmate.2026.102230
Department(s)
Materials Science and Engineering
Publication Status
Open Access
Keywords and Phrases
Magnetic field-induced strain; Magnetic reorientation; Magnetic shape memory alloy; Magnetic transformation; Martensitic transformation
International Standard Serial Number (ISSN)
2949-8228
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2026 Elsevier, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution 4.0 License.
Publication Date
01 Jul 2026
Included in
Applied Mechanics Commons, Civil and Environmental Engineering Commons, Engineering Mechanics Commons, Manufacturing Commons, Mechanics of Materials Commons, Metallurgy Commons, Structural Materials Commons
Comments
U.S. Department of Energy, Grant DE-NA0002839