| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
Uniform Plastic Deformation and Underlying Defect Activities of High-Entropy Alloys and Intermetallic Compounds |
| Author(s) |
Shou-Yi Chang, Chi-Huan Tung, Ya-Jing Lee |
| On-Site Speaker (Planned) |
Ya-Jing Lee |
| Abstract Scope |
The unique mechanical properties of high-entropy alloys that include circumvented strength-ductility trade-off are of great research interest. While extensive studies have indicated some important deformation behaviors such as nanotwinning- or transformation-induced plasticity and local chemical ordering-mediated ductility, the underlying defect activities are still worth investigations. In our studies using micro-to-nanoscale mechanical testing, much uniform deformation was observed in both face-centered cubic and body-centered cubic high-entropy alloys and even in B2 high-entropy intermetallic compounds. Rather than the regular long-range planar gliding of long dislocations in low-entropy alloys and intermetallic compounds, the homogeneous nucleation and small-range activities of abundant localized defects and a high density of cooperating slip systems mediated the uniform plasticity, high hardenability and even capable recovery of the high-entropy ones. Atomistic simulations also suggest that the heterogeneity of constituent atoms generates local plastic events that will develop into abundant short dislocations for plastic deformation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Modeling and Simulation |