About this Abstract |
Meeting |
2026 TMS Annual Meeting & Exhibition
|
Symposium
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Thermodynamics and Kinetics of Alloys IV
|
Presentation Title |
Creep-induced elemental redistribution in alloys – A combined experimental and computational study |
Author(s) |
Boopathy Kombaiah, Sriswaroop Dasari, Chaitanya Bhave, Shehab Shousha, Jarin French , Yogesh Kumar, Christopher Bearcroft, Tanner Mauseth, Jana Howard, Ninad Mohale, Linu Malakkal, 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 to support this deformation mechanism remains elusive. The gradients in vacancy flow plays a pivotal role in diffusional creep yet imaging these vacancies either in situ or postmortem presents significant challenges. This challenge motivates our hypothesis that observation of elemental redistribution at grain boundaries (GBs) will provide compelling, and in some cases, decisive evidence of creep mechanisms. To test this hypothesis, we conducted experiments demonstrating creep-induced elemental redistribution (CIER) at GBs in Fe and Ni-based alloys. To further understand and explicate our experimental observations, we performed a comprehensive multiscale modeling investigation. This included density functional theory, molecular dynamics, and a mesoscale chemo-mechanics coupled diffusion model, which correlates elemental redistribution at GBs to vacancy-mediated processes. We will emphasize the significance of CIER in designing creep-resistant materials and accurately predicting the creep lifetime of engineering components. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Modeling and Simulation, Characterization |