New thermodynamic parameter describing glass forming ability of bulk metallic glasses

The key step in exploiting a new type of bulk metallic glass (BMG) is to judge quickly the glass forming ability (GFA) of the alloys. The mole melting enthalpies of BMGs are calculated using the weighted averages principle. The reliability and limitation of the T-rg criterion for GFA are discussed, and the reason why the T-rg of BMGs presently is more than 0.5 is also discussed. In addition, two new criteria, Delta H-mg and Delta G(g), for GFA are presented. The GFA sequence of BMGs is calculated using the Delta H-mg criterion, the result agrees with that of Inoue and Shibata and R-c criterion. Furthermore, as an example, the R-c of the alloys developed by Dong Chuang et al. are calculated using Delta H-mg and Delta G(g). The ascending sequence of these alloys calculated by the Delta H-mg the result using the Delta G(g) criterion is contrary to that of Dong Chuang convenient than the Delta G(g) criterion. Chuang et al. In contrast, et al., indicating that the Delta H-mg criterion is better and more The optimum Delta H-mg was found to be -15.16 kJ mol(-1).