A new criterion for glass-forming ability based on both devitrification and solidification processes

Based on the time-temperature-transformation interpretation, a new criterion for glass forming ability, Z = [(T-x-T-g)/(T-1-T-g)][(T-1-T-1(c))/(T-1-T-g)](0.556), is proposed, where T-g, T-x, T-1 and T-1(c) respectively denote the glass transition temperature, the onset crystallization temperature upon heating, the liquidus temperature and the onset solidification temperature of the liquid upon cooling. The Z parameter jointly considers the stability of the liquid and the devitrification of glassy phases. A non-linear relationship between the parameter Z and the critical glassy size d(c) has been found to be log (d(c))(cal) = 0.1392 + 17.0616Z - 41.985(Z)(2), showing stronger correlation than other earlier reported parameters. The advantage of using Z as a GFA parameter is that it roughly reflects the relative influences of the thermodynamics and kinetics of the systems on glass formation. In addition, the parameter describes the stability of liquid in the course of being quenched from above liquidus temperature.

Automated summary

A new criterion Z for glass forming ability is proposed based on the time-temperature-transformation interpretation, considering the stability of the liquid and the devitrification of glassy phases. A non-linear relationship between Z and the critical glassy size is found, showing stronger correlation than previously reported parameters. The advantage of using Z as a GFA parameter lies in its reflection of the relative influences of the thermodynamics and kinetics of systems on glass formation.