Abstract
A thermodynamic model for internal hydrogen-induced embrittlement (HIE) in single crystals is proposed. The model is based on the assumption that the ductile versus brittle transition is controlled by the competition between dislocation emission from the crack tip and cleavage decohesion of the lattice. Embrittlement in single crystals is induced by segregation of hydrogen in solid solution to the crack tip and/or the fracture surfaces during separation, which reduces the cohesive energy of the lattice. This process will occur when the mobility of hydrogen atoms is high so that a surface excess of hydrogen can be built up during separation. The model predictions for hydrogen induced cleavage in iron single crystals are presented.
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