Film thickness effect on formation of ultrastable metallic glasses
| Autor: | David M. Miskovic, Michael Ferry, Qijing Sun |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Amorphous metal
Materials science Physics and Astronomy (miscellaneous) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Structural heterogeneity 0104 chemical sciences Average size Chemical physics Physical vapor deposition Statistical analyses General Materials Science 0210 nano-technology Energy (miscellaneous) |
| Zdroj: | Materials Today Physics. 18:100370 |
| ISSN: | 2542-5293 |
| DOI: | 10.1016/j.mtphys.2021.100370 |
| Popis: | Ultrastable metallic glasses (SMGs) formed by physical vapor deposition are an interesting new class of material, exhibiting enhanced stability argued to be equivalent to conventionally quenched metallic glasses that have been aged for thousands of years. The factors controlling the formation and structural development of SMGs are still not well understood. For the first time, the impact of film thickness toward the development of SMGs was explored. By controlling the thickness, we can tune the thermophysical and mechanical properties of SMGs. Geometrical and statistical analyses indicate that the films initially contain loose-packing phases that tend to elongate and present with a larger average size and less dispersive distribution as a result of induced geometric confinement. As the film is built up, structural heterogeneity develops, leading to variations in properties as the glass undergoes rejuvenation. This study provides direct evidence for the structural changes underlying the unique properties of SMGs and challenges the empirical rules for SMGs design. |
| Databáze: | OpenAIRE |
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