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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.58  No.11 (2017)  >  pp.1511-1518

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Magnetic-Field-Induced Acceleration of Phase Formation in τ-Mn-Al

Ryota Kobayashi1), Yoshifuru Mitsui1), Rie Y. Umetsu2), Kohki Takahashi2), Masaki Mizuguchi2), Keiichi Koyama1)
1) Graduate School of Science and Engineering, Kagoshima University 2) Institute for Materials Research, Tohoku University

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.

high magnetic fields, manganese-aluminium, phase formation, ferromagnetic material

Received: May 24, 2017
Accepted: September 04, 2017 , Published online: October 25, 2017



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