Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Effect of Magnetic Transitions on the Formation of the Thermal Vacancy in αFe
Taichi AbeMasato ShimonoTakeshi Nakamura
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JOURNALS FREE ACCESS Advance online publication

Article ID: TETSU-2019-041

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Abstract

In the processes of precipitations and phase transformations, thermal vacancies play an important role through diffusions of atoms. Due to magnetic transitions, the thermal vacancy fraction becomes smaller in the ferromagnetic state comparing to the paramagnetic state. In this work, the effect of magnetic transitions on the vacancy formation was examined using Inden model for the magnetic excess Gibbs energy, which has been widely applied in the CALPHAD-type thermodynamic assessments. In the present work, the effect of magnetic transitions on SFeMag/R and HFeMag is estimated to be 0 ~ –0.5 and 0 ~ 0.06 eV, respectively, The differences between ferromagnetic and paramagnetic states of αFe are +0.06 eV for the enthalpy of vacancy formation, and −0.435 R for the entropy of vacancy formation.

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© 2019 The Iron and Steel Institute of Japan
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