Abstract
A novel expression has been obtained for the Gibbs free-energy change (ΔG) during the crystallization of an undercooled liquid. The expression for ΔG has been derived assuming that the specific heat difference ΔCp is constant over a wide temperature range. Calculations based on the expression show that the ΔG values obtained for a variety of bulk glass-forming alloys (La55Al25Ni20, La55Al25Ni15Cu5, Cu47Ti34Zr11Ni8) are in excellent agreement with experimental values, with a maximum deviation of ∼3% up to a chosen temperature as low as the Kauzmann temperature, TK . However, for systems like Pd40Cu30Ni10P20, which possess excellent glass-forming ability, the constant-ΔCp assumption is not appropriate and another similar expression for ΔG has been derived that uses a hyperbolic temperature variation of ΔCp . The ΔG values for Pd40Cu30Ni10P20 obtained under this assumption lie very close to the experimental ones.
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