| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
Anisotropy Grading Effects on Strength and Ductility |
| Author(s) |
S. Mohadeseh Taheri-Mousavi, Dingshun Yan, C. Cem Tasan |
| On-Site Speaker (Planned) |
S. Mohadeseh Taheri-Mousavi |
| Abstract Scope |
Engineering lighter vehicles, higher buildings, and larger planes create an everlasting need for superior metallic materials which exhibit simultaneously high strength and ductility. Employing conventional bulk material processing methods, we demonstrate a microstructure design strategy to improve strength-ductility combinations. This approach includes coupling a crystallographic texture gradient to a weak grain size gradient (i.e. > 200 times weaker than that of conventional grain size graded materials). Proof-of-principle tests led a 1 GPa automotive sheet steel to increase its tensile ductility by 50% and its strength by 12%. Our molecular dynamics and crystal plasticity finite element simulations reveal that the main reason for the improvement in mechanical properties is a reduction in the stress triaxiality. Therefore, by redistribution of the internal stress due to gradient transverse deformation, the void growth on grain boundaries is delayed. The concept can potentially be readily applied to different alloys or other thermo-mechanical treatments. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |