Abstract:Bulk glass state Zr52.5Ni14.6Al10Cu17.9Ti5alloy sample with a diameter of 6mm was prepared by melt injection. Its thermal properties were determined by DTA and DSC analyses. The critical cooling rate for glass formation in Zr52.5Ni14.6Al10Cu17.9Ti5alloy 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 wedge-shaped samples was estimated by testing the glass state area on the longitudinal cross sectional structure of the wedge-shaped samples. The key factors which affect crystallization and growth were discussed.

Key words: Zr-based glass state alloy　bulk glass state alloy　melt injection　critical cooling rate