Abstract The continuous and isothermal crystallization diagrams of the Pt 42.5 Cu 27 Ni 9.5 P 21 and the Pt 60 Cu 16 Co 2 P 22 bulk glass forming compositions are determined using calorimetric experiments. In the case of the Pt 42.5 Cu 27 Ni 9.5 P 21 bulk metallic glass, the formation of the primary crystalline phase can be prevented by rapid cooling in a conventional DSC. In contrast, for similar cooling conditions, the formation of the primary precipitating compound in Pt 60 Cu 16 Co 2 P 22 cannot be prevented in a conventional DSC as also observed in in-situ synchrotron X-ray scattering experiments. This is attributed to a critical overheating, above which remaining structures dissolve, resulting in a drastic increase of the degree of undercooling, similar to what is observed in Zr-based BMGs. Using the classical nucleation theory, the combined thermodynamic and kinetic data are used to model the isothermal crystallization data for Pt 42.5 Cu 27 Ni 9.5 P 21 , yielding an interfacial energy value of 0.11 J/m 2 between the primary nucleating crystal and the liquid. This value is three times higher than the value for good Zr-based glass-formers, suggesting that the interfacial energy plays a pivotal role in the exceptionally high glass-forming ability of Pt-P-based systems and compensates for the fragile liquid behavior and the large driving force for crystallization.

中文翻译：

---

Pt-Cu-Ni/Co-P基液体的高玻璃形成能力

摘要 Pt 42.5 Cu 27 Ni 9.5 P 21 和Pt 60 Cu 16 Co 2 P 22 块状玻璃成型组合物的连续和等温结晶图是使用量热实验确定的。在Pt 42.5 Cu 27 Ni 9.5 P 21 块状金属玻璃的情况下，可以通过常规DSC中的快速冷却来防止初级结晶相的形成。相反，对于类似的冷却条件，在原位同步加速器 X 射线散射实验中也观察到，在常规 DSC 中无法防止在 Pt 60 Cu 16 Co 2 P 22 中形成主要沉淀化合物。这归因于临界过热，超过该温度时剩余结构溶解，导致过冷度急剧增加，类似于在 Zr 基 BMG 中观察到的情况。使用经典的成核理论，组合的热力学和动力学数据用于模拟 Pt 42.5 Cu 27 Ni 9.5 P 21 的等温结晶数据，在初级成核晶体和液体之间产生 0.11 J/m 2 的界面能值。该值比良好的 Zr 基玻璃形成剂的值高三倍，表明界面能在 Pt-P 基系统的超高玻璃形成能力中起着关键作用，并补偿了脆弱的液体行为和结晶的大驱动力。