|About this Abstract
||MS&T23: Materials Science & Technology
||Multi Scale Modeling of Microstructure Deformation in Material Processing
||An Experimental and Modeling Study of Vacancy Diffusion Creep and Segregation in Multicomponent Alloys
||Chaitanya V. Bhave, Sriswaroop Dasari, Sourabh Kadambi, Boopathy Kombaiah
|On-Site Speaker (Planned)
||Chaitanya V. Bhave
Polycrystals at high temperatures experience stress-driven vacancy diffusion descried by Nabarro-Herring and Coble creep theories. In this work, we test the hypothesis that diffusion of vacancies to certain grain boundaries result in elemental segregation due to the differences in the diffusion coefficients. Results from creep experiments are presented for 304L stainless steel for various temperatures and stresses. Solute segregation is examined using transmission electron microscopy (TEM) and atom probe tomography (APT). We elucidate the mechanisms for diffusional creep associated segregation using a novel chemo-mechanics coupled phase-field model for multicomponent alloys that describes the creep strain as a function of vacancy flux. The model predictions from Multiphysics Object-Oriented Simulation Environment (MOOSE)-based implementation are verified against analytical models and compared against experiments. This work opens research avenues for exploration of diffusion creep in alloys via elemental characterization of grain boundaries.