Dresden 2026 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 39: Hydrogen in Materials II
MM 39.8: Vortrag
Freitag, 13. März 2026, 12:15–12:30, SCH/A215
An atomic-scale master-equation model study of the mobility of a dislocation core interacting with interstitial hydrogen in a metal — •Daniel Pfalzgraf1, Daniel F. Urban1,2, and Christian Elsässer1,2 — 1Fraunhofer IWM, Wöhlerstraße 11, 79108 Freiburg, Germany — 2Freiburg Materials Research Center (FMF), University of Freiburg, Stefan-Meier-Str. 21, 79104 Freiburg, Germany
We examine the influence of interstitial hydrogen in a metal on the motion of a dislocation by means of a master equation model. This model takes as input atomic-scale information, such as material-specific defect-migration energy barriers and interatomic interaction energies, to produce the drift velocity of a mechanically driven dislocation core segment as a function of the local hydrogen concentration around it. Our approach can take detailed correlation effects into account, for example, that the dislocation core acts as a mobile hydrogen trap, resulting in an inhomogeneous distribution of hydrogen around it. The results can be used to estimate in which ranges of temperature or interaction strength the presence of hydrogen increases or decreases the mobility of the dislocation core, which is of interest in the context of hydrogen embrittlement mechanisms.
Keywords: Transport Modelling; Dislocation Mobility; Hydrogen in Metals; Hydrogen Embrittlement