| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Light Metal and Composites Technology
|
| Presentation Title |
Revisiting Phase Field Simulations of Theta’ Variant Selection during Stress Aging of Al-Cu Alloys |
| Author(s) |
Bala Radhakrishnan, Amit Shyam |
| On-Site Speaker (Planned) |
Bala Radhakrishnan |
| Abstract Scope |
A review of literature on the variant selection of theta’ prime during stress aging of Al-Cu alloy shows conflicting results. Eto et al. (Acta metallurgica, 1978) show that external compression along [001] promotes (001) variants. Phase-field simulations of Li and Chen (Acta. Mater., 1998) are in agreement with the above finding. However, Chen et al. (Materials Char. 2018) indicate that applying compression results in the elimination of the (001) variants. Recent experiments by Guo et al. (J. Alloys Compounds, 2020) show that edge dislocations forming during stress aging reduce the tendency for preferential formation of (001) variants under compression. We present large scale, three-dimensional, phase field simulations of theta’ variant selection in the presence of external load, with or without dislocation strain fields in order to address the above discrepancy. Research funded by the Department of Energy’s Vehicle Technology office at the Oak Ridge National Laboratory under contract DE-AC05-00OR22725. |