Kinetic Arrest of Martensitic Transformation in Ni33.0Co13.4Mn39.7Ga13.9 Metamagnetic Shape Memory Alloy

Xiao Xu; Wataru Ito; Rie Y. Umetsu; Keiichi Koyama; Ryosuke Kainuma; Kiyohito Ishida

doi:10.2320/matertrans.MBW200915

Kinetic Arrest of Martensitic Transformation in Ni_33.0Co_13.4Mn_39.7Ga_13.9 Metamagnetic Shape Memory Alloy

Xiao Xu, Wataru Ito, Rie Y. Umetsu, Keiichi Koyama, Ryosuke Kainuma, Kiyohito Ishida

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Keywords: NiCoMnGa, metamagnetic shape memory alloy, kinetic arrest

JOURNAL FREE ACCESS

2010 Volume 51 Issue 3 Pages 469-471

DOI https://doi.org/10.2320/matertrans.MBW200915

View "Advance Publication" version (February 17, 2010).

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Abstract

Martensitic and magnetic properties of Ni_33.0Co_13.4Mn_39.7Ga_13.9 metamagnetic shape memory alloy were investigated. The kinetic arrest phenomenon was observed at about 120 K by thermomagnetization measurements, and magnetic field-induced transformation (MFIT) was also detected at various temperatures ranging from 4.2 to 300 K. By evaluation of the equilibrium magnetic fields and temperatures based on the transformation fields and temperatures, it was confirmed that the transformation entropy change below 120 K becomes almost zero, which results in the kinetic arrest phenomenon.

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