Magnetic-field-induced enhancement of phase transformation in ferromagnetic τ-Mn-Al

Ryota Kobayashi; Yoshifuru Mitsui; Rie Y. Umetsu; Kohki Takahashi; Masaki Mizuguchi; Keiichi Koyama

doi:10.2320/jinstmet.J2018057

Magnetic-field-induced enhancement of phase transformation in ferromagnetic τ-Mn-Al

Ryota Kobayashi, Yoshifuru Mitsui, Rie Y. Umetsu, Kohki Takahashi, Masaki Mizuguchi, Keiichi Koyama

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Abstract

The magnetic field effect on phase formations of ferromagnetic Mn-Al（τ-phase）was evaluated. The transformation from ε-phase with hcp-structure to τ-phase was accelerated by annealing in magnetic field. With in-field annealing at 623 K, the magnetization of the sample annealed at 15 T was a maximum of 72.2 A･m²/kg at 1.5 T, which was over 4 times larger than that annealed in a zero field. Meanwhile, the precipitation of non-ferromagnetic β-phase was suppressed by in-field annealing. Magnetic field-induced acceleration of ε-τ transformation and suppression of τ-β transformation were due to the gain of Zeeman energy of τ-phase.

Original language	English
Pages (from-to)	181-185
Number of pages	5
Journal	Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume	83
Issue number	6
DOIs	https://doi.org/10.2320/jinstmet.J2018057
Publication status	Published - 2019

Keywords

Ferromagnetic material
High magnetic fields
Manganese-aluminum
Phase formation

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title = "Magnetic-field-induced enhancement of phase transformation in ferromagnetic τ-Mn-Al",

abstract = "The magnetic field effect on phase formations of ferromagnetic Mn-Al（τ-phase）was evaluated. The transformation from ε-phase with hcp-structure to τ-phase was accelerated by annealing in magnetic field. With in-field annealing at 623 K, the magnetization of the sample annealed at 15 T was a maximum of 72.2 A･m2/kg at 1.5 T, which was over 4 times larger than that annealed in a zero field. Meanwhile, the precipitation of non-ferromagnetic β-phase was suppressed by in-field annealing. Magnetic field-induced acceleration of ε-τ transformation and suppression of τ-β transformation were due to the gain of Zeeman energy of τ-phase.",

keywords = "Ferromagnetic material, High magnetic fields, Manganese-aluminum, Phase formation",

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T1 - Magnetic-field-induced enhancement of phase transformation in ferromagnetic τ-Mn-Al

AU - Kobayashi, Ryota

AU - Mitsui, Yoshifuru

AU - Umetsu, Rie Y.

AU - Takahashi, Kohki

AU - Mizuguchi, Masaki

AU - Koyama, Keiichi

PY - 2019

Y1 - 2019

N2 - The magnetic field effect on phase formations of ferromagnetic Mn-Al（τ-phase）was evaluated. The transformation from ε-phase with hcp-structure to τ-phase was accelerated by annealing in magnetic field. With in-field annealing at 623 K, the magnetization of the sample annealed at 15 T was a maximum of 72.2 A･m2/kg at 1.5 T, which was over 4 times larger than that annealed in a zero field. Meanwhile, the precipitation of non-ferromagnetic β-phase was suppressed by in-field annealing. Magnetic field-induced acceleration of ε-τ transformation and suppression of τ-β transformation were due to the gain of Zeeman energy of τ-phase.

AB - The magnetic field effect on phase formations of ferromagnetic Mn-Al（τ-phase）was evaluated. The transformation from ε-phase with hcp-structure to τ-phase was accelerated by annealing in magnetic field. With in-field annealing at 623 K, the magnetization of the sample annealed at 15 T was a maximum of 72.2 A･m2/kg at 1.5 T, which was over 4 times larger than that annealed in a zero field. Meanwhile, the precipitation of non-ferromagnetic β-phase was suppressed by in-field annealing. Magnetic field-induced acceleration of ε-τ transformation and suppression of τ-β transformation were due to the gain of Zeeman energy of τ-phase.

KW - Ferromagnetic material

KW - High magnetic fields

KW - Manganese-aluminum

KW - Phase formation

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JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

IS - 6

ER -

Magnetic-field-induced enhancement of phase transformation in ferromagnetic τ-Mn-Al

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