MAGNETIC HARDENING BY CRYSTALLIZATION OF AMORPHOUS PRECURSORS USING VERY HIGH HEATING RATES

The dependence of the treatment parameters of the coercivity of PrNdFe B samples prepared by crystallization of melt spun amorphous precursor s is investigated. The crystallization treatments were carried out at high temperatures and using very high heating rates (''flash crystalli zation''). From the analysis of the temperature dependence of the crit ical field of the samples, it is concluded that this kind of crystalli zation treatment leads to very fine and homogeneous microstructures wh ich result in a significant enhancement of the hard magnetic propertie s.