| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Progress towards Understanding the Synthesis and Behavior of Metals Far from Equilibrium: A SMD Symposium Honoring Enrique Lavernia on the Occasion of His 60th Birthday
|
| Presentation Title |
Hierarchical Microstructural Paradigms for Simultaneous Enhancement of Strength and Ductility |
| Author(s) |
Rajiv S. Mishra |
| On-Site Speaker (Planned) |
Rajiv S. Mishra |
| Abstract Scope |
Strength plays an important role in structural efficiency of materials and is a key driver for the strength-limiting design and fatigue-limiting design values. Nanocrystalline and ultrafine grained alloys possess significant strength because of grain boundary strengthening. However, they lack uniform ductility and work hardening. To simultaneously enhance strength and ductility, approaches that balance blockage of dislocations and strain hardening rate while delaying the onset of failure mechanisms are needed. Some recent results on transformation induced plasticity (TRIP) and twinning induced plasticity (TWIP) high entropy alloys (HEAs) will be presented to highlight the potential of achieving exceptional work hardening rate in ultrafine HEAs. As a result of higher work hardening, the TRIP and TWIP HEAs exhibit enhanced fatigue behavior. The enhancement in fatigue behavior is linked with delayed crack nucleation. In TRIP HEAs, the crack growth is retarded by transformation in the localized region of crack. |
| Proceedings Inclusion? |
Undecided |