Abstract
Phase-pure τ-MnAlC powder has been synthesized using mechanical alloying followed by a single annealing step. Mechanical alloying from the elemental constituents resulted in 100 wt.% nanocrystalline β-Mn(Al) phase. Complete β-Mn(Al) to τ-MnAlC phase transformation – via the high-temperature ε-phase – was obtained through annealing and quenching of the as-milled powder. The influence of the quenching rate (3.5–100 °C/s) is discussed in detail. Powder synchrotron X-ray and neutron diffraction data was used to confirm phase-purity, and to determine the magnetic moments of Mn. A coercivity of 0.15 T was obtained for the as-synthesized τ-MnAlC, significantly higher than previously reported values for τ-MnAlC synthesized with a one-step route. A systematic study utilizing cryomilling was attempted to further increase the coercivity.
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