Effect of the Crystallization Conditions of Alloy Mn54Al43C3 on the Magnetic Properties of Mechanically Milled Powder

Resumo

Results of formation of a ferromagnetic τ-phase and an antiferromagnetic ε-phase in alloys of type Mn₅₄Al₄₃C₃ obtained by induction and arc melting and by rapid hardening of the melt are presented. The magnetic hysteresis properties of powders produced by high-power mechanical milling of the synthesized alloys are studied. The optimum temperature conditions for transformation of the ε-phase into a ferromagnetic τ-phase are determined for the alloys and for their ultrafine powders. The resulting powders of Mn₅₄Al₄₃C₃ have an ultimate specific magnetization σ_m = 81 (G · cm³)/g and a coercive force H_c = 3 kOe in a magnetic field of 12 kOe.