A criterion for the glass-forming ability of binary bulk metallic glasses

作者：Ri, Jae Bok^*; Wen, Zi; Jiang, Qing

来源：Journal of Non-Crystalline Solids, 2017, 471: 264-267.

DOI：10.1016/j.jnoncrysol.2017.06.004

• Bulk metallic glasses (BMGs)
• Glass-forming ability (GFA)
• Binary phase diagram
• Eutectic composition
• Critical cooling rate
• Crystallization

We proposed a parameter phi = (Delta H-m(c) - R Delta T-e(mix))/Delta H-m(c) as a criterion for glass-forming ability (GFA) of binary alloys near eutectic composition using the thermodynamic data of the equilibrium phase diagram by considering the relative thermodynamic stability of the liquid phase. The larger phi is, the larger GFA is in different binary alloy systems. A linear fit of R-c = 7.73 x 10(23) exp(-65.26 phi) is obtained, where R-c denotes the critical cooling rate to form glass from liquid. Since phi is determined directly from thermodynamic data of elements and well known equilibrium phase diagram, GFA of binary alloys can be easily estimated without any thermal measurement after fabrication of BMGs.

• 出版日期2017-9-1
• 单位吉林大学