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.