Kinetic arrest of martensitic transformation in NiCoMnAl metamagnetic shape memory alloys

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  • Xu Xiao
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Ito Wataru
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Tokunaga Masashi
    International MegaGauss Science Laboratory, Institute for Solid State Physics, The University of Tokyo
  • Umetsu Rie Y.
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Kainuma Ryosuke
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Ishida Kiyohito
    Department of Materials Science, Graduate School of Engineering, Tohoku University

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  • Kinetic Arrest of Martensitic Transformation in NiCoMnAl Metamagnetic Shape Memory Alloy

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説明

Magnetic properties and martensitic transformation behaviors of NiCoMnAl metamagnetic shape memory alloys were investigated. The kinetic arrest phenomenon was observed at about 40 K during thermomagnetization measurements. At temperatures ranging from 4.2 to 200 K, magnetic field-induced reverse transformation was confirmed by a pulse magnetometer with a magnetic field up to 45 T. By plotting the equilibrium magnetic fields against the measured temperature, the transformation entropy change was calculated by using the Clausius-Clapeyron equation. The transformation entropy change was found to become zero below 40 K, which can explain the appearance of the kinetic arrest phenomenon.

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