Ferromagnetic to weak-magnetic transition accompanied by bcc to fcc transformation in Fe-Mn-Al alloy

摘要

Magnetic properties and phase change in Fe-36 at. %Mn-15 at. %Al ternary alloy were investigated. Direct evidence of a ferromagnetic to weak-magnetic transition accompanied by martensitic transformation from the bcc-α (A2) phase to the fcc-γ' (2M) phase was obtained, where the magnetic state of the parent and the martensite phases are ferromagnetic and weak-magnetic, respectively. The origin of this unique phase change is caused by the peculiar γ-loop of α/γ equilibrium formed in Fe-Mn-X (X: ferrite stabilizing element) system due to the magnetic effect.