Authors: V. Rao 1 and A. Mitra 1
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  • 1 National Metallurgical Laboratory Magnetic Materials Group 831007 Jamshedpur India 831007 Jamshedpur India
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Abstract  

Phase transformation studies carried out on Mn−Al−C permanent magnet alloy employing DSC and electrical resistivity measurements, are reported and discussed. The transformation of the hexagonal Mn−Al phase (disordered and non-magnetic) to the ferromagnetic fct phase proceeds via the formation, in at least two stages, of the ordered orthorhombic phase. The activation energy for the formation of the fct phase is ≈34.65 kcal/mol. Microstructural changes occurring at various stages of the transformation are also studied.