On the high glass-forming ability of Pt-Cu-Ni/Co-P-based liquids
| Autor: | Ralf Busch, Sascha Sebastian Riegler, Benedikt Bochtler, Simon Hechler, Alexander Kuball, Oliver Gross, Isabella Gallino, Moritz Stolpe |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
Materials science
Polymers and Plastics Analytical chemistry Bulk metallic glass 02 engineering and technology Kinetic energy 01 natural sciences law.invention Crystal law 0103 physical sciences Time-temperature transformation diagram Crystallization Supercooling 010302 applied physics Amorphous metal Scattering Metals and Alloys 021001 nanoscience & nanotechnology Surface energy Electronic Optical and Magnetic Materials Crystallography Interfacial energy Ceramics and Composites Classical nucleation theory 0210 nano-technology Glass-forming ability |
| DOI: | 10.22028/d291-39676 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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