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MM: Fachverband Metall- und Materialphysik

MM 45: Mechanical Properties and Alloy Design: e.g. Light-Weight, High-Temperature, Multicomponent Materials IV

MM 45.5: Talk

Wednesday, March 20, 2024, 16:45–17:00, C 230

Dislocation Crack Interactions in Tungsten — •Benedikt Eggle-Sievers and Erik Bitzek — Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf

The fracture toughness of single crystalline Tungsten at low temperature is critically influenced by its microstructure. Understanding the underlying crack-microstructure interactions is therefore necessary to model and predict materials failure. In order to gain insight into the interactions of dislocations with crack tips, large-scale atomistic simulations are carried out. Screw dislocations are placed in the vicinity of a strain-controlled crack. In various crack systems screw dislocations that are attracted towards the crack tip have a strong tendency to cross-slip at the crack tip and glide along the crack front. Driving forces for this phenomenon as well as implications for fracture behaviour shall be discussed in this contribution.

Keywords: Dislocations; Cracks; Fracture; Tungsten; Atomistic Simulation