| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior Related to Interface Physics IV
|
| Presentation Title |
Understanding Grain Boundary-Dislocation Interactions in MoNbTi and Their Role Mediating
Low Temperature Ductility |
| Author(s) |
Glenn H. Balbus, Byron McArthur, Oleg Senkov, Samuel Kuhr, Todd Butler |
| On-Site Speaker (Planned) |
Glenn H. Balbus |
| Abstract Scope |
Refractory alloys are well suited for use in high temperature structural applications and extreme environments. However, many refractory alloys, including refractory complex concentrated alloys (RCCAs), are difficult to thermomechanically process due to their limited low temperature ductility. While there are many possible origins for this behavior, one potential mechanism underpinning the limited ductility and propensity for intergranular fracture in refractory metals is the behavior of lattice dislocations as they impinge on grain boundaries. Here, we investigate dislocation-grain boundary interactions in a promising RCCA, MoNbTi, at the macroscopic and micro-mechanical level via uniaxial compression, EBSD, bi-crystal micropillar compression, and post-mortem transmission electron microscopy. Our results will be discussed relative to grain boundary misorientation, residual Burgers vector, and correlations with intergranular failure in macroscopic samples. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Thin Films and Interfaces, High-Entropy Alloys |