| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Grain Boundary Segregation Behavior in Ni and Fe Based Alloys During Diffusional Creep |
| Author(s) |
Boopathy Kombaiah, Sriswaroop Dasari, Chaitanya Bhave, Shehab Shousha, Advika Chesetti, Ninad Mohale, Benjamin Beeler, Sourabh Kadambi |
| 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. The current study is thus focused on understanding the diffusional creep mechanisms in candidate alloy systems such as Ni-Cr, Ni-Re, Fe-Cr-Ni and high entropy alloys. Specifically, this study tests the hypothesis of varied solute segregation to the grain boundaries depending on their orientation with respect to tensile loading axis. The grain boundaries in the undeformed or grip section of the specimen were compared to grain boundaries in the gauge section that are parallel or perpendicular to loading direction. The results reveal interesting insights into the competition between thermal equilibrium and diffusional creep induced segregation processes in the alloys. The experiments were further supported by density functional theory calculations and a novel chemo-mechanics coupled diffusion model for multicomponent alloys that predicts elemental segregation at grain boundaries. |