| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
J-6: A Micromechanical Investigation of the Orientation Dependent Plasticity of a MoNbTi Alloy |
| Author(s) |
Glenn H. Balbus, Satish I. Rao, Oleg N. Senkov, Eric J. Payton |
| On-Site Speaker (Planned) |
Glenn H. Balbus |
| Abstract Scope |
Refractory multi-principal element alloys (RMPEAs) are promising candidate materials for use in high temperature structural applications and other extreme environments. Recent experiments and simulations have highlighted the unusual deformation behavior of an equiatomic MoNbTi alloy, which exhibits slip on higher order planes and sluggish edge dislocation mobility. Here, we report the orientation dependent deformation behavior of MoNbTi utilizing micropillar compression and post-mortem transmission electron microscopy. Our results suggest that deformation in this system is largely mediated by kink-migration of screw dislocations, as evidenced by the absence of twinning-antitwinning asymmetry and the presence of long screw dislocations and significant dislocation debris in post-mortem observations. We also report an unusual orientation dependence of the yield strength, owing to the high stress required to facilitate slip on {110}-type planes. These results further demonstrate the unconventional plasticity in BCC RMPEAs, and highlight the importance of kink-migration of screw dislocations. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, High-Entropy Alloys |