Superheated liquid fragility and thermodynamic refinement for evaluation of metallic glass-forming ability

作者：Meng, Q G; Zhang, S G; Xia, M X; Li, J G^*; Zhou, J K

来源：Applied Physics Letters, 2007, 90(3): 031910.

DOI：10.1063/1.2432167

• Boltzmann constant
• Fragility parameter
• Glass forming ability
• Superheated liquid fragility

Based on the super-Arrhenius equation and Angell's fragility concept [J. Non-Cryst. Solids 131, 13 (1991)], the expression of the fragility parameter for superheated liquid is deduced as M=E-infinity/k(B)T(l), where E-infinity is the activation energy, k(B) the Boltzmann constant, and T-l the liquidus temperature. It exhibits a negative correlation with the glass-forming ability (GFA) of the referenced metallic glasses in the same system rather than in the different systems, while the parameter epsilon based on order-disorder competition is just the opposite. The refined fragility parameter M-* (=M/epsilon) gives a much better reflection of the GFA for the metallic glasses.

• 出版日期2007-1-15
• 单位上海交通大学