Fe based hard magnetic alloy having a supercooled liquid region

摘要

PROBLEM TO BE SOLVED: To obtain an amorphous alloy in which the temp. interval in a supercooled liq. region is controlled to the value above the specified one and having hard magnetism at a room temp. by forming an alloy compsn. contg. rate earth elements and Co or Ni, and the balance Fe. SOLUTION: This alloy is an Fe base hard magnetic alloy composed of a compsn. expressed by the formula of Fe100-x-y-zRxTyBz, and in which the temp. interval ΔTx in a supercooled liq. region expressed by the formula of ΔTx=Tx-Tg is controlled to =20K. Relating to this metallic glass alloy, ΔTx is preferably controlled to =30K, and heat treatment at 500 to 900 deg.C is suitable. In the formula, R denotes rate earth elements, T denotes Co and Ni, as to (x), (y) and (z), by atom, 1=x=10%, 3=y=20% and 16=z=35% are satisfied, Tx denotes the crystallization starting temp., and Tg denotes the glass transition temp. Since it has the temp. interval ΔTx in a wide supercooled liq. region, amorphous single phases can easily be obtd., and, after the heat treatment, a fine and uniform crystal structure can be obtd.