About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Vacancy Engineering in Metals and Alloys
|
| Presentation Title |
Modelling the role of impurity trapping in excess vacancy evolution and its influence on age hardening behaviors in multicomponent aluminium alloys |
| Author(s) |
Xuezhou Wang, Chunan Li, Dongdong Zhao, Yijiang Xu, Yanjun Li |
| On-Site Speaker (Planned) |
Xuezhou Wang |
| Abstract Scope |
Excess vacancies play a crucial role in the precipitation of age-hardening precipitates in aluminium alloys. A finite volume numerical model has been developed to simulate the temporal evolution and spatial distribution of non-equilibrium excess vacancies across grains during quenching and subsequent ageing in multicomponent aluminium alloys. The model rigorously accounts for vacancy annihilation at grain boundaries and dislocations, as well as repartitioning and trapping of vacancies by individual solute atoms. Moreover, a recently developed analytical scheme is used to evaluate the effective vacancy diffusivity under the influence of solute trapping. The model is applied to assess the impact of quenching mode, NA, AA temperature, grain size, dislocation density, and impurity additions on precipitation and age hardening kinetics in commercial alloys. This model provides valuable insights into the roles of excess vacancies in precipitation behavior and offers guidance for optimizing alloy composition and thermomechanical processing parameters to enhance mechanical performance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Computational Materials Science & Engineering, Phase Transformations |