|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Seeing is Believing -- Understanding Environmental Degradation and Mechanical Response Using Advanced Characterization Techniques: An SMD Symposium in Honor of Ian M. Robertson
||An Experimental-numerical Approach to Investigate Hydrogen Effects on Dislocations
||Haoxue Yan, Qingjie Li, Jinwoo Kim, Ju Li, C. Cem Tasan
|On-Site Speaker (Planned)
The interactions between hydrogen (H) and crystallographic defects are the key to understanding hydrogen embrittlement mechanisms, including H-enhanced localized plasticity (HELP). However, unraveling such interactions on their inherent spatial and temporal scales can be challenging, due to the complex relationship between H, microstructure, and the mechanical response. To tackle this challenge, we design in situ experiments that combine electron channeling contrast imaging (ECCI), electron backscattered diffraction (EBSD) and desorption spectroscopy, to investigate H-defect interactions under no external stresses. We show that the inhomogeneous H distribution within microstructures can cause dislocation rearrangements, and discuss the effects of materials properties (i.e. yield stress and stacking fault energy) on the observed H-dislocation interactions. Moreover, by hybrid Molecular Dynamics (MD) and Grand Canonical Monte Carlo (GCMC) simulations, we provide atomistic insights into the effects of chemical composition and pre-existing dislocation structures on H-defect interactions.