About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Bulk Metallic Glasses XVII
|
Presentation Title |
High Pressure Quenched Metallic Glasses |
Author(s) |
Wojciech Dmowski, Stanislaw Gierlotka, Geunhee Yoo, Hui Wang, Yoshihiko Yokoyama, Eun Soo Park, Takeshi Egami |
On-Site Speaker (Planned) |
Wojciech Dmowski |
Abstract Scope |
High Pressure Quenched (HPQ) glasses are prepared by quenching from the supercooled liquid under hydrostatic pressure and decompression at RT. The HPQ samples have a different structure and higher density, and mirror the pressure induced structure in the liquid state. The data suggest that pressure induces a phase transition in the supercooled liquid. HPQ glass sample transforms back to the structure, quenched without pressure by annealing near Tg. Volume expansion studies show volume relaxation upon reaching Tg. The HPQ glasses exhibit larger value of Young modulus and microhardness revealed by nanoindentation and static compression examinations. Interestingly the yield stress is also increased. The DSC studies suggest high activation volume during transformation from the HPQ structure to the “equilibrium” glass. TEM examination of the partially crystallized samples reveal unexpected microstructures induced by crystallization under pressure.
Supported by the U.S. Department of Energy, Basic Energy Sciences, Materials Science and Engineering Division. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |