Fracture mechanisms of symmetrical tilt grain boundaries |
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| Authors: | Diana Farkas |
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| Institution: | 1. Physics Laboratory, H. C. ?rsted Institute, University of Copenhagen , Universitetsparken 5, DK-2100, Copenhagen ?, Denmark;2. Laboratory of Applied Physics 11 , Technical University of Denmark |
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| Abstract: | The mechanisms of failure of symmetrical tilt boundaries have been investigated using an atomistic technique. The fracture process advances in steps that are related to the structural unit of the symmetrical tilt grain boundary. These boundaries are shown to fail through a combined mechanism involving dislocation emission in certain regions of the structural unit, followed by microcleavage, and again dislocation emission. The overall toughness of the boundaries is given by the combination of the toughness of these two processes. |
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