Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 34: Topical Session: Fundamentals of Fracture - Fracture at the Atomistic Scale

MM 34.1: Vortrag

Mittwoch, 13. März 2013, 11:45–12:00, H4

Intergranular vacancies impact fracture — •Döme Tanguy — Université de Lyon 1 France

Hydrogen has a strong binding to vacancies, which could lead to large vacancy concentrations. We study, by atomistic simulations, their possible impact on grain boundary fracture. Intergranular vacancy clusters are generated by Monte Carlo. The configurations are passed to MD and the critical loads for dislocation emission are compared to those for crack propagation. We report the minimum void size that triggers brittle propagation by "nano void" growth and discuss the crossover from intrinsic ductility to brittleness.