Microstructure Evolution and Its Effect on Magnetic Properties of Mn-Al Alloy Fabricated via End Milling Machining Process

Rare earth free permanent magnets have been required for the recent growing interests on the renewable energy technology, expecting increased usage of permanent magnets. Manganese aluminum alloy near equi-atomic composition, slightly Mn rich, has been considered as prospective rare earth elements free permanent magnet materials [1]. However, recent progress on the developing of Mn-Al based PM materials still does not satisfy the expected performance It has been believed that the grain refinement techniques can enhance the magnetic property of Mn-Al PM materials In the present work, novel approach, end milling machining process, was applied to fabricate nanocrystalline PM materials by Severe Plastic Deformation (SPD) to improve the magnetic properties.