Microstructure and magnetic properties of Mn-Al-C permanent magnets produced by various techniques

Bulk Mn 52 Al 46 C 2 in ? -phase was prepared by vacuum induction melting and used as precursor for the production bulk permanent magnets suction casting hot-extrusion. Part of alloy mechanically milled into a powder samples electron beam melting, hot-compaction high pressure torsion processes. The microstructure magnetic properties all were investigated correlated. It found that mechanical deformation enhances coercivity, up to 0.58 T, while absence this strain is beneficial magnetization. Among observed techniques, hot extrusion have shown promising possibilities further develop Mn-Al-C magnets. However, it should be taken account challenges related design proper processing window limitation HPT regarding texture.