High Magnetic Field Effects on Phase Transformation Kinetics of ε-Mn-Al Probed Using Differential Thermal Analysis

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  • Mitsui Yoshifuru
    Graduate School of Science and Engineering, Kagoshima University
  • Fumoto Shuto
    Graduate School of Science and Engineering, Kagoshima University
  • Kobayashi Ryota
    Graduate School of Science and Engineering, Kagoshima University
  • Takahashi Kohki
    Institute for Materials Research, Tohoku University
  • Koyama Keiichi
    Graduate School of Science and Engineering, Kagoshima University Center for Advanced Science Research and Promotion, Kagoshima University

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<p>Differential thermal analysis (DTA) on quenched Mn55Al45 with hcp structure (ε-phase) was performed under magnetic fields up to 15 T in order to investigate the magnetic field effects on the transformation kinetics of ε-phase. So far, the annealing of ε-phase under magnetic field indicated the acceleration of the phase transformation from the ε-phase to the metastable ferromagnetic τ-phase with L10 structure and the suppression of the decomposition into the equilibrium phase (β-phase). In this study, as the magnetic field intensity increased, the transformation temperature from ε-phase gradually decreased to the lowest value in the range from 0 to 4 T. A single exothermic peak was observed on each DTA curve, and it was found that the peak contained plural exothermic ε–τ and τ–β transformations. Activation energy of the transformation also showed the lowest value in the magnetic field range from 4 to 10 T, suggesting that the activation energy of the ε–τ transformation decreases at low magnetic field region from 0 to 4 T and the activation energy of the τ–β transformation increases at high magnetic field region from 10 to 15 T. These changes in activation energy were discussed by contribution of Zeeman energy for nucleation of the τ-phase in the ε-matrix and that of β-phase from the τ-phase.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 66 (2), 230-235, 2025-02-01

    The Japan Institute of Metals and Materials

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