Thermodynamic behaviour of bulk metallic glasses

The thermodynamic behaviour of bulk metallic glass forming melts have been studied by analyzing the temperature dependence of the Gibbs free energy difference ΔG, entropy difference ΔS and enthalpy difference ΔH between the undercooled melts and corresponding equilibrium solid phases. The study is made by calculating ΔG, ΔS and ΔH in the entire temperature range Tm to Tg for five samples Mg65Cu25Y10, Cu47Ti34Zr11Ni8, Zr46Cu46Al8, Zr46(Cu4.5/5.5Ag1/1.5)46Al8, Zr57Cu15.4Ni12.6Al10Nb5 and it is found that the calculated values of these thermodynamic parameters are very close to the experimental values, where Tm and Tg are melting temperature and glass transition temperature, respectively.

► First time thermodynamic study of BMGs on the basis of hole theory of liquids.
► Kauzmann temperature TK and residual entropy ΔSR have been studied for BMGs.
► The reduced residual entropy has been proposed to study the GFA of BMGs.