Correlation between glass-forming ability and thermodynamic parameters of Ti–Zr–Cu–Pd metallic glasses: calculation and experimental validation

<p dir="ltr">The prediction of the formation of bulk metallic glasses (BMG) is challenging due to their complex thermodynamic and kinetic behavior. This study proposes the P HSS parameter, a thermodynamic model which captures the concomitant effects of enthalpy of chemical mixing, mismatch entropy, and configurational entropy, as a predictor of glass-forming ability (GFA) in the Ti–Zr–Cu–Pd alloy system. Our results reveal a good linear correlation between P HSS values and critical casting diameters, with more negative P HSS values corresponding to higher GFA. In addition, the P HSS values corresponding to a glass-forming range in Ti–Zr–Cu–Pd alloys were identified according to the fitted data supported by experimental verification. To do that, five (plus one extra for validation) compositions were manufactured and characterized using thermo-physical techniques. Crystallization kinetics and fragility of the supercooled liquids were studied to quantify the GFA of these alloys. We reveal that activation energies for glass transition and crystallization increase with GFA and correlate negatively with P HSS values. A new relationship linking activation energy and thermostability was also explored. This integrated numerico-experimental approach establishes a direct link between thermodynamic parameters and GFA that contributes as a cost-effective tool for flexible exploration of new Ti–Zr–Cu–Pd BMGs, suitable for structural and biomedical applications. </p>