Magnetic properties of metastable phase from undercooled Nd-Fe-B melts

摘要

Nd_(14)Fe_(79)B_(7) alloys were solidified from the undercooled melts by containerless processing. The resultant alloys contained a large amount of a metastable phase with a chemical composition near that of the bulk alloy and a crystal structure similar to that of the Nd_(2)Fe_(17) phase. The metastable phase had low magnetic properties, a saturation magnetization of 86.7 emu/g, a remanence of 4.5 emu/g and a coercivity of 0.14 kOe. The magnetic properties of the sample annealed at 1020 K were markedly improved due to the increase in the amount of the Nd_(2)Fe_(14)B phase.