Thermodynamic calculation of glass forming ranges in Al-Mg-Y and Al-Ni-Y ternary alloy systems

摘要

The glass forming ranges of the ternary Al-Mg-Yand Al-Ni-Y systems have been predicted and compared withexperimental measurements. A thermodynamic method(CALPHAD method) has been used to obtain T0 curves of fivebounding binary systems, Al-Ni, Ni-Y, Y-Al, Al-Ni and Ni-Y, andternary Al-Mg-Y and Al-Ni-Y systems. Glass transitiontemperature Tg in these systems has been approximated bycrystallization temperature Tx, which was derived from therelationship with hole formation enthalpy. Based on the magnitudebetween T0 and Tg the glass forming range has been determined.The range has been calculated to be rather wide because of theupper limit concept for Tg. This approach can be used as a guide topredict the glass forming range of binary, ternary and evenmulticomponent systems.