Kinetics of crystallization of amorphous Cu50Ti50 alloy

The kinetics of crystallization of amorphous Cu50Ti50 alloy has been studied with the help of non-isothermal scanning experiments in a differential scanning calorimeter. The thermograms at different scanning rates show a sharp crystallization peak followed by a broad, diffuse exothermic event. The method suggested [K. Matusita, S. Sakka, Phys. Chem. Glasses 20 (1979) 77] and the peak shift method given by Kissinger have been utilized to derive important kinetics parameters namely activation energy of crystallization Ec, Avrami exponent, n; and dimensionality of growth m. The derived value of Ec = 303 ± 83 kJ/mol, obtained via the modified Kissinger equation, is in fair agreement with the reported value 280 kJ/mol for Cu50Ti50 [K.H.J. Buschow, Acta Metall. 31 (1983) 155; Scripta Metall. 17 (1983) 1135] and 261.2 kJ/mol for Cu40Ti60 glass reported by Miao et al. The results indicate bulk crystallization in the present amorphous alloy. The dimensionality of growth has been found to decrease with an increase in the heating rate.