Different Magnetic Field Effects on the <inline-formula> 
                     <tex-math notation="LaTeX">$\varepsilon- \tau$ </tex-math>
                  </inline-formula> Phase Transformation Between (Mn,Zn)–Al and Mn–Al–C

Yoshifuru Mitsui, Ryota Kobayashi, Yudai Takanaga, Akio Takaki, Rie Y. Umetsu, Kohki Takahashi, Masaki Mizuguchi, Keiichi Koyama

doi:10.1109/tmag.2018.2860559

In-magnetic-field annealing (IFA) effects on Zn-modified Mn-Al and Mn-Al-C were investigated at the annealing temperature of 573 K, which was around their TC. Mn 53 Zn 2 Al 45 showed the magnetic-field-induced acceleration of the phase transformation to L10-phase (τ-phase) and the suppression of that to nonferromagnetic equilibrium phase. For Mn 55 Al 45 C 2 , IFA effects were not clearly detected. These different magnetic field effects were discussed by the difference of the mechanism in stabilization of τ-phase. It is found by a thermal analysis that the modification of Zn stabilized τ-phase against e-phase, realizing acceleration of transformation to τ-phase. The addition of carbon stabilized e-phase against τ-phase. The ineffectiveness of in-field annealing for Mn-Al-C is due to the stabilization of e-phase and the reduction of the Curie temperature. The combination of Zn modification and IFA is realized to synthesize high fraction of τ-phase for short annealing time and low annealing temperature.

Different Magnetic Field Effects on the <inline-formula> <tex-math notation="LaTeX">$\varepsilon- \tau$ </tex-math> </inline-formula> Phase Transformation Between (Mn,Zn)–Al and Mn–Al–C

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