|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||Role of Hydrogen on Metal Plasticity: An Ab-Initio Study
||Pulkit Garg, Ilaksh Adlakha, Kiran Solanki
|On-Site Speaker (Planned)
Hydrogen embrittlement (HE) is a phenomenon that affects both the physical and chemical properties of several intrinsically ductile metals. Consequently, understanding the mechanisms behind HE has been of particular interest in both experimental and modeling research. Discrepancies between experimental observations and modeling results have led to various proposals for HE mechanisms. Therefore, to gain insights into HE mechanisms, we aim to examine the effect of hydrogen on the critical resolved shear stress required for dislocation nucleation across a wide range of metals (Fe, Nb, Ta, Ni, Al and Ti) using first principle calculations. The increasing concentration of hydrogen was found to consistently decrease the stress required for dislocation nucleation for all the metals. However, the large decrease was observed for Fe closely followed by other BCC metals. Finally, the quantum charge transfer analysis was found to provide insights into underlying mechanism responsible for the enhanced dislocation nucleation.
||Planned: Supplemental Proceedings volume