Influence of Heat Treatment on Magnetic Properties of Nd_9(FeCoZrAl)_(85)B_6 Amorphous Alloy

摘要

The phase component, the grain size and the magnetic properties of rapidly quenching Nd 9(FeCoZrAl) 85 B 6 amorphous alloy at different heat treatment were investigated. The heat treatment process influences obviously the crystallizing of Nd 2Fe 14 B and α Fe phase, the grain size and the magnetic properties of the alloy. When the heat treatment temperature is lower, the crystallizing of amorphous phase is not sufficient, the grains grow unhomogeneously, so the grain size of Nd 2Fe 14 B phase is much larger. When the heat treatment temperature is much higher, although the amorphous phase is fully crystallized, the grains grow quickly and its size is much larger, too. When the amorphous alloy is heat treated at a proper temperature at 685 ℃ and 30 min, the amorphous phase is fully crystallized and the growth of Nd 2Fe 14 B grains is not remarkable. Thus the grain size is very small, and the magnetic coupling effect reaches a maximum value between the Nd 2Fe 14 B grains and between the Nd 2Fe 14 B grain and α Fe grain, so the alloy possesses good magnetic properties, and the magnetic properties of epoxy resin bonded magnet from the alloy are B r=655 mT, j H c =639 2 kA·m -1 , b H c =381 6 kA·m -1 , ( BH ) m=65 68 kJ·m -3 .