Microstructure and martensitic transformation in Ni25Ti25Hf25Cu25 medium entropy shape memory alloy

• Published in: Intermetallics Vol. 168; p. 108254
• Main Authors: Li, Q.Z., Wang, H.Y., Shuitcev, A.V., Wang, B.H., Li, L., Tong, Y.X.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-05-2024
• Subjects: High–entropy alloys; Martensitic structure; Martensitic transformation; Shape–memory alloys; Shape–memory effects; Shape–memory effects; High–entropy alloys; Shape–memory alloys; Martensitic transformation; Martensitic structure
• ISSN: 0966-9795; 1879-0216
• DOI: 10.1016/j.intermet.2024.108254

Ni25Ti25Hf25Cu25 medium entropy shape memory alloy (MESMA) exhibit reversible B2↔B19′ martensitic transformation. Martensitic morphology is represented by (011) type I twins with low density of inner (001) compound twins. In a bending test, Ni25Ti25Hf25Cu25 exhibits reversible strain of 2.4% under stress of 300 MPa.
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•Ni25Ti25Hf25Cu25 exhibits B2↔B19′ MT.•Low density of (001) compound twins into martensitic variants.•Recoverable strain of 2.4% under stress of 300 MPa.