Magnetic-Field-Induced Acceleration of Phase Formation in τ-Mn-Al
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Ryota Kobayashi1), Yoshifuru Mitsui1), Rie Y. Umetsu2), Kohki Takahashi2), Masaki Mizuguchi2), Keiichi Koyama1)
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1) Graduate School of Science and Engineering, Kagoshima University
2) Institute for Materials Research, Tohoku University
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The phase formation of ferromagnetic L10-MnAl (τ-phase) was accelerated by annealing in magnetic field. With in-field annealing at 623 K, the magnetization of the τ-phase annealed at 15 T was a maximum of 72.2 A・m2/kg at 1.5 T, which is over 4 times larger than that annealed without an external magnetic field for the same annealing time. On the other hand, the transformation from τ-phase to β-phase was suppressed under magnetic field. The obtained bulk sample did not show magnetic anisotropy because of the ε-τ solid-state transformation. Obtained results suggested that magnetic field induced acceleration of transformation was due to the gain of Zeeman energy, which increases the driving force of the ε-τ transformation.
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Keyword: high magnetic fields, manganese-aluminium, phase formation, ferromagnetic material
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Received: May 24, 2017
Accepted: September 04, 2017 ,
Published online: October 25, 2017 |
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