Abstract
Mn-Al based hard magnetic magnets have attracted growing attention as low cost hard magnetic materials. Preparation of high performance Mn-Al based anisotropic magnetic powders with high content of magnetic phase is a challenging task due to the poor stability of the ι-MnAl phase. In this work, Mn50Al46Cu4C3 flakes with a micron, submicron and nanosize thickness have been fabricated by surfactant assisted ball milling. Cu and C co-doping in Mn50Al46Cu4C3 can stabilize the ι phase and prevent its decomposition into the nonmagnetic phases even after 15 h milling. The influence of the milling time on the flakes size distribution, morphology and magnetic properties of these Mn50Al46Cu4C3 flakes were investigated systematically. Anisotropic Mn50Al46Cu4C3 flakes first with micron and then with submicron thicknesses were formed via a continuous cleavage along the easy glide (110) planes of the ι-MnAl during the early stage of milling. With further milling, [001] textured polycrystalline nanosize flakes were formed. The coercivity of Mn50Al46Cu4C3 flakes increased initially with the milling time and then it slightly decreased after reaching the maximum value of 2608.1 Oe. However, the coercivities of the flakes also larger than 2500 Oe even for 15 h milling.
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