Kinetic study of rapidly quenched Ni81P19 amorphous alloys

Differential scanning calorimetry (DSC) measurements with different tempera ture programs were used to study the crystallization kinetics of Ni81P19 am orphous ribbons quenched from melt at different temperatures (920-1600 degr ees C) and from a constant melt temperature (920 degrees C) at different qu enching rates leading to different thickness. A mathematical model was prop osed assuming that the nuclei are formed during the preparation and pretrea tment of the samples and grow during the DSC experiments. Its validity was proved by the non-linear least squares evaluation of 44 DSC experiments, Th is model describes our experiments better than Avrami-Erofeev equation. (C) 2000 Elsevier Science B.V. All rights reserved.