| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior Related to Interface Physics IV
|
| Presentation Title |
Creep-Induced Segregation at Grain Boundaries of Alloys – A Compelling Experimental Evidence for Diffusional Creep |
| Author(s) |
Sriswaroop Dasari, Chaitanya Bhave, Shehab Shousha, Jana Howard , Advika Chesetti, Ninad Mohale, Benjamin Beeler, Sourabh Kadambi, Boopathy Kombaiah |
| On-Site Speaker (Planned) |
Boopathy Kombaiah |
| Abstract Scope |
While the theories of Newtonian viscous diffusional creep in materials are well-established, direct experimental evidence is still lacking to support this deformation mechanism. Motion of vacancies play a pivotal role in diffusional creep, yet it is difficult to image either in situ or postmortem. This challenge motivates our hypothesis that imaging elemental segregation at grain boundaries (GBs) will provide compelling and, in some cases, decisive evidence of creep mechanisms. With that hypothesis, we demonstrated creep-induced segregation (CIS) at GBs of Ni based alloys using experiments. Furthermore, we examined the dependency of CIS on the GB orientation with the stress axis. To explicate our experimental observations, we performed density functional theory and self-consistent mean field calculations and a novel chemo-mechanics coupled diffusion model for alloys that predicts elemental segregation at GBs. This talk will discuss the significance of CIS on designing creep-resistant materials and predicting creep lifetime of engineering components accurately. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Modeling and Simulation, Characterization |