Fe-Co-Nd-Zr-B系ガラス合金の結晶化過程と磁気特性

抄録

New Fe-based amorphous alloys exhibiting the glass transition and supercooled liquid region before crystallization were searched for in the composition range of Fe₆₃Co₇Nd_10-xZr_xB₂₀ (x=0 to 6 at%). Amorphous alloys containing 4 to 6 at%Zr were found to exhibit the glass transition followed by a supercooled liquid region. The crystallization of the 4 at%Zr and 6 at%Zr alloys occurred in three stages. In the crystallized state, the alloys exhibited hard magnetic properties, namely, J_s of 1.15 to 1.18 T, J_r of 0.75 to 0.76 T, and Nd₂Fe₁₄B phases for the 4 at%Zr alloy subjected to optimum annealing were about 50 nm and 30 nm, respectively, and the exchange magnetic coupling interaction between the α-Fe and Nd₂Fe₁₄B phases is thought to make possible the appearance of the hard magnetic properties.