|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Interface-driven Phenomena in Solids: Thermodynamics, Kinetics and Chemistry
||The Influence of Local Stress States on Hydrogen Segregation at Grain Boundaries in FCC Metals
||Xiao Zhou, Jun Song
|On-Site Speaker (Planned)
Hydrogen embrittlement (HE) has been a major concern in the design of reliable structural materials. Being one of the main preferential lattice heterogeneities for hydrogen accumulation, grain boundary (GB) plays a key role in understanding the HE mechanism. In this study, we performed atomic simulations to study how the local lattice stress states influence hydrogen segregation at grain boundaries. Various symmetric tilt grain boundaries in several FCC metals were examined. A strong correlation between the hydrogen adsorption energy and local stress tensor was identified. This correlation can be attributed to the local geometrical distortion characteristics at GBs. One simple analytical model has been proposed to provide quantitative assessment of the hydrogen adsorption energetics based on the stress states at GBs. Our findings provide new insights toward fundamental understanding of the interplay between hydrogen and microstructures.
||Planned: A print-only volume