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

The dependence of the treatment parameters of the coercivity of PrNdFeB samples prepared by crystallization of melt spun amorphous precursors is investigated. The crystallization treatments were carried out at high temperatures and using very high heating rates ("flash crystallization"). From the analysis of the temperature dependence of the critical field of the samples, it is concluded that this kind of crystallization treatment leads to very fine and homogeneous microstructures which result in a significant enhancement of the hard magnetic properties.