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

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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