抄録
The magnetic properties of Fe-Tb-B alloys with TbFe2, finely crystallized from an amorphous state were in vestigated. The amorphous samples with the composition of more than 5 mol% B, which are situated on the connected line between Fe2Tb and FeB, were prepared by rapid-quenching. An amorphous Fe65Tb30B5 alloy began to crystallize into a single phase of TbFe2 at 803 K, and a microstructure with a grain size of about 10nm was obtained by heating at this crystallization temperatutre for 1 hour. The fine TbFe2phase lowered the coercive force. Substitution of 5 mol% Mo in Fe65Tb30B5 led to the smaller grain size and also lower coercive force. On the other hand, the magnetostriction of Fe-Tb-B alloys at an applied field of 1.28 MA/m was increased by replacing Fe by 5 mol% Ti or 5 mol% Cr.
