Hydrogen-Induced Transformation of Dislocation Core in Fe and Its Effect on Dislocation Mobility

In this research, we employ atomistic simulations to scrutinize the impact of hydrogen (H) on dislocation mobilityDislocation mobility in ironIron (Fe). Our study uncovers two critical aspects: Firstly, hydrogen atoms serve to stabilize the edge dislocation core, thereby elevating the shear stress threshold needed for dislocation mobilization. Secondly, hydrogen's influence on dislocation mobilityDislocation mobility is velocity-dependent; it enhances mobility at low velocities by diminishing latticeLattices resistance but hampers it at high velocities due to increased viscous drag. These nuanced findings illuminate the multifaceted relationship between hydrogen atoms and dislocation mechanisms. They offer valuable insights for the development of materialsMaterials with enhanced mechanical propertiesMechanical properties and contribute to strategies for mitigating hydrogen-induced material degradationMaterial degradation.