|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Pressure Effects in Zr-based Super-cooled Liquids
||Wojciech Dmowski, Stanislaw Gierlotka, Geun Hee Yoo, Eun Soo Park, Takeshi Egami
|On-Site Speaker (Planned)
Applying high pressure in the supercooled liquid of Zr-based glasses results in structural rearrangements that change local-short range atomic order. This affects thermo-mechanical properties of glasses formed by quenching under pressure. At room temperature and ambient pressure these glasses have higher density, larger Young’s modulus and hardness. Their relaxation spectra are distinct from annealed or equilibrated glasses suggesting a new thermal state. Upon heating at ambient pressure, it is observed that on approaching Tg, these glasses increase their volume, expanding relatively more than as cast samples. Together with density data, this confirms the idea that hydrostatic pressure in the SCL region leads to a new state with higher density and better packing. The observed structural effects can be rationalized by idea that in Zr-based glasses Zr-covalency competes against tendency of close packing.
Supported by the U.S. Department of Energy, Basic Energy Sciences, Materials Science and Engineering Division.
||Other, Characterization, Phase Transformations