| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond V
|
| Presentation Title |
Examining the Influence of Chemical Inhomogeneity in Modelling Plasticity and Fracture in Complex Concentrated Alloys |
| Author(s) |
Anne Marie Z. Tan, Zhi Li, Yakai Zhao, Upadrasta Ramamurty, Huajian Gao |
| On-Site Speaker (Planned) |
Anne Marie Z. Tan |
| Abstract Scope |
Many complex concentrated alloys (CCAs) have demonstrated superior mechanical properties including high strength, ductility, and potential hydrogen embrittlement resistance. To understand the fundamental mechanisms underlying these behaviors in CCAs, we typically rely on models developed for conventional metals and alloys, which may not accurately capture the effects of the chemical complexity in CCAs. We present two studies which demonstrate both the application and limitations of conventional mechanics models in CCAs: In the first, we develop a model to describe the statistics of incipient plasticity during nanoindentation of CCAs. By accounting for spatial variations in the local generalized stacking fault energy surface, our model captures key differences in the nanoindentation-induced incipient plasticity response of CCAs compared to conventional metals. In the second, we apply a density functional theory-informed Griffith-Rice model to predict the ductile/brittle response of crack tips interacting with twin boundaries in a model CCA compared to a conventional metal. |