| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
C-26: Strain-Induced Phase Transformation in Al-Zn-Mg Alloys: A Molecular Dynamics Study for Metastable Nanoprecipitate Stabilization |
| Author(s) |
Yu-ning Chiu, Chung-yi Yu, Shih-kang Lin |
| On-Site Speaker (Planned) |
Yu-ning Chiu |
| Abstract Scope |
The transformation from coherent metastable precipitates to their incoherent stable counterparts results in a substantial reduction in the strength of Al-Zn-Mg-based 7000 series aluminum alloys. Despite the critical role of these precipitates, the challenge of experimentally characterizing their precipitation kinetics—due to their nanoscale size and metastability—has led to a prolonged lack of comprehensive understanding. In this study, we utilized molecular dynamics (MD) simulations to clearly illustrate the continuous phase transformation phenomenon during the η'→η_2 transition at an atomic scale. Our findings indicate that the transition of the precipitate is primarily triggered by the accumulation of strain at the coherent interface. As a result, we demonstrate a practical strategy to alleviate this driving force via solute segregation, which is made possible by a strain-relaxation mechanism. This method holds the potential to significantly impede the η'→η_2 transition, thus noticeably improving the stability of the precipitates. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Computational Materials Science & Engineering, Phase Transformations |