| 摘要 |
PURPOSE:To provide a ultrafine crystalline alloy with certain magnetic permeability in a low exciting magnetic field and to improve its perminvar properties by subjecting an amorphous alloy consisting essentially of Fe, an A group (Cu, Ag and Au) and an M group (Nb, W, Ta or the like) to heat treatment under specified conditions. CONSTITUTION:An amorphous alloy consisting essentially of Fe, an A group (at least one kind from among Cu, Ag and Au) and an M group (at least one kind from among Nb, W, Ta, Zr, Hf, Ti, V, Mn, Cr and Mo) is manufactured. This alloy is subjected to heat treatment in an atmosphere of a nitrogen gas or the like to convert at least >=50% of the crystals in the structure into fine ones having <=1000Angstrom average grain size. Next, the alloy is subjected to heat treatment at the Curie temp. or below of a bccFe solid soln. phase formed by crystallization. In this way, the ultrafine crystalline alloy showing perminvar properties having a constricted hysteresis loop, having high magnetic permeability and excellent in stability can be obtd. |
