KINETIC STUDY ON FORMATION OF BULK GLASS STATE Zr52.5Ni14.6Al10Cu17.9Ti5 ALLOY

Bulk glass state Zr52.5Ni14.6Al10Cu17.9Ti5 alloy sample with a diameter of 6 mm was prepared by melt injection. Its thermal properties were determined by DTA and DSC analyses. The critical cooling rate for glass formation in Zr52.5Ni14.6Al10Cu17.9Ti5 alloy was evaluated to be 13.4 K/s, 19.0 K/s and 32.6 K/s from the empirical model and the kinetic model of glass formability respectively by using the DTA and DSC data. The real cooling rate in center of wedgeshaped samples was estimated by testing the glass state area on the longitudinal cross sectional structure of the wedgeshaped samples. The key factors which affect crystallization and growth were discussed.