| 摘要 |
PROBLEM TO BE SOLVED: To optimize the hydrogenizing and recrystallizing treating conditions by discharging an alloy for inspecting in the process of hydrogenizing the alloy powder and confirming intermediate stage phases. SOLUTION: The temp. of the raw powder of an R-T-(M) base alloy is raised, which is hydrogenized, is discharged in the process of the treatment and is rapidly cooled to obtain an alloy for inspecting. As for intermediate stage phases confirmed by this alloy for inspecting, in addition to a lamellar structure composed of coarse α-Fe and Fe2 B grains and α-Fe and RH2 , contg. R2 Fe14 B fine grains and RH2 on the direction same as that of mother phases, Fe enriched alloy phases contg. <=10at.% are largely present, but, they vanish by the prolongation of the hydrogenizing time. Then, in the process of the hydrogenizing, this Fe enriched alloy phases, i.e., the intermediate stage phases are confirmed, and while the formation of the R2 Fe14 B fine grains and their convertion into anisotropic ones are verified, it is regulated to an optimum alloy phase structure, i.e., the optimum conditions are set, by which the fine crystals of the R2 Fe14 B phases can uniformly be dispersed into the intermediate stage phases by the hydrogenizing treatment. |
