PECULIARITIES OF THE CRYSTALLIZATION KINETICS OF FE73.5CU1NB3SI13.5B9RIBBON TO THE NANOSTRUCTURED PHASE

Continuous heating as well as isothermal differential scanning calorim etry was used to study the transformation of Fe73.5Cu1Nb3Si13.5B9 ribb ons to a crystalline state. The scanning 'crystallization' peak was sm all and wide, with a long high-temperature tail. It shifted to higher temperatures after pre-annealing. The isothermal transformation signal s always decreased monotonically, only the amplitude changing with tem perature, but not the position. All of these abnormal characteristics may be explained in terms of a grain-growth mechanism, involving the c oarsening of already existing crystal nuclei to give the crystalline m aterial.