Gibb's free energy for the crystallization of glass forming liquids

Abstract

This letter gives an approximation for the Gibb's free energy change for the crystallization of undercooled liquid (Δ G). The present Δ G expression is arrived at by the modification of existing models. Calculations based on the present expression have shown that the Δ G values obtained for seven glass forming alloys (Au_81.4Si_18.6,La₅₀Al₃₀ Ni₂₀, Mg₆₅Cu₂₅Y₁₀, Mg₅₀Ni₃₀La₂₀, Pd₄₀Ni₄₀P₂₀, Zr₆₅Cu_17.5Ni₁₀Al_7.5, and Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5) compare well with the experimental ones in all the cases with a maximum deviation of 6% up to the glass transition temperature (T_g). The present expression is able to calculate the ΔG values accurately in a variety of glass forming alloys ranging from binary to quinary systems with a wide range of reduced glass transition temperature (T_rg=T_g/T_m) of 0.45-0.75.