About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Nanostructured Materials in Extreme Environments
|
Presentation Title |
Influence of Hydrostatic Pressure on Impurity Segregation in Nanocrystalline Metals |
Author(s) |
Zuoyong Zhang, Chuang Deng |
On-Site Speaker (Planned) |
Zuoyong Zhang |
Abstract Scope |
Previous work evidenced that hydrostatic pressure would stabilize the ultrafine-grained metals and induce the elimination of inverse Hall-Petch effect. Herein, we employ molecular dynamics simulations to investigate the hydrostatic pressure effects on the impurity segregation in nanocrystalline metals. The results show that it will facilitate the segregation of Mg in nanocrystalline aluminum by increasing the pressure up to a critical value 5 GPa. Then, the preferred segregation grain boundary sites will be reduced under higher pressure. The existence of a maximum solubility in grain boundaries due to hydrostatic pressure in the Al-Mg system is unexpected and somewhat surprising. The underlying mechanisms are analyzed based on the influence of pressure on the local environments at grain boundary sites. It reveals that the free energy for impurity segregation is not a simple function of free volume at grain boundaries, which shed new light on alloy design for high pressure applications. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Nanotechnology, |