Effects of fragility and reduced glass transition temperature on the glass formation ability of amorphous alloys

Abstract

In this paper, based on the reduced glass transition temperature () proposed by Turnbull and the relation between the glass-forming ability (GFA) and the short-range bond ordering of liquids demonstrated by Tanaka, a detailed analysis on the specific roles of and fragility of the glass forming liquid (m) in characterizing the GFA has been conducted, and then a novel GFA parameter was put forward. This new GFA parameter , which increases with a decrease in the critical cooling rate (Rc) for glass formation, is a complex function of and m. The relationship between Rc and the parameter was identified and verified using available literature data for broad range of amorphous alloys with widely varying GFA. The correlation coefficient (R2) of 0.9 clearly shows an excellent correlation between GFA and the parameter and that is a more superior indicator compared to currently reported similar GFA parameters.