Abstract
MnAl-C permanent magnetic alloy has a giant anisotropy (Ha) of 57 kOe; however, it is difficult to synthesize high coercivity MnAl-C permanent magnetic material. In this research work, the microstructure, phase composition, magnetic properties and magnetic domain of different content Cu added (Mn55Al45−xCux)100C2 (x = 0, 1, 2, 3) alloys were systematically investigated. The added Cu could stabilize both the ε and ferromagnetic τ phase when the content of the added Cu is x ＜ 2 in the (Mn55Al45−xCux)100C2 (x = 0, 1, 2, 3) alloy system. The added Cu precipitated, formed a cellular structure shell around each Mn-rich τ phase grain and pin the magnetic domain movement. The added Cu promoted the transformation of the domain structure within the Mn-rich τ phase from narrow slender shape to isoaxial grain shape.
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