Influence of Fe and Co on Phase Transitions in Ni-Mn-Ga Alloys

Vladimir V. Khovailo; Toshihiko Abe; Viktor V. Koledov; Minoru Matsumoto; Hirokazu Nakamura; Ryunosuke Note; Makoto Ohtsuka; Vladimir G. Shavrov; Toshiyuki Takagi

doi:10.2320/matertrans.44.2509

Vladimir V. Khovailo, Toshihiko Abe, Viktor V. Koledov, Minoru Matsumoto, Hirokazu Nakamura, Ryunosuke Note, Makoto Ohtsuka, Vladimir G. Shavrov, Toshiyuki Takagi

Author information

Vladimir V. Khovailo
National Institute of Advanced Industrial Science and Technology, Tohoku Center
Toshihiko Abe
National Institute of Advanced Industrial Science and Technology, Tohoku Center
Viktor V. Koledov
Institute of Radioengineering and Electronics of RAS
Minoru Matsumoto
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
Hirokazu Nakamura
Institute of Fluid Science, Tohoku University
Ryunosuke Note
Institute for Material Research, Tohoku University
Makoto Ohtsuka
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
Vladimir G. Shavrov
Institute of Radioengineering and Electronics of RAS
Toshiyuki Takagi
Institute of Fluid Science, Tohoku University

Keywords: quaternary Heusler alloys, martensitic transition, Curie temperature, ferromagnetic shape memory alloys

JOURNALS FREE ACCESS

2003 Volume 44 Issue 12 Pages 2509-2512

DOI https://doi.org/10.2320/matertrans.44.2509

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Abstract

Differential scanning calorimetry (DSC) and magnetic measurements were performed to study the influence of ferromagnetic 3-d transition elements Fe and Co on structural and magnetic properties of ferromagnetic shape memory alloys Ni₂MnGa. Addition of Fe or Co on the Ni sites decreases the temperature of martensitic phase transition T_m, whereas addition of Co on the Mn sites results in a considerable increase of T_m. Magnetic measurement revealed that Curie temperature T_C increases upon substitution of Fe or Co for Ni. This observation is of importance for design of high temperature ferromagnetic shape memory alloys.

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