Rapid quenching and properties of hard magnetic materials in MnAl-X (X=Ti,Cu, Ni,C, B) systems

MnAl-X (X=Ti, Cu, Ni, C, B) ribbons were fabricated by a rapid quenching from the melt using a single roller method. As-rapid quenched ribbons were quenched completely into high temperature h c p phase. The rapid quenched ribbons were brittle especially carbon doped ribbons, however, the titanium doped ribbons were relatively ductile. Hard magnetic properties were measured using a vibrating sample magnetometer for the ten kinds of ribbons annealed at 410–700° C for 10 min–100 h. Phase transformation characteristics and magnetic properties were discussed by comparison with the samples produced by the conventional method. Titanium, boron and carbon doped ribbons showed good hard magnetic properties.