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Dislocation dynamics simulations of plasticity in dispersion hardened metals

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In crystalline materials, the plastic deformation is controlled by the motion of dislocations, the linear defects present in the crystal and associated with a lattice distortion. The recent simulation technique of Dislocation Dynamics (DD) is a powerful tool to investigate the dislocations-dislocations interactions, their collective behaviour and also interactions with other obstacles such as precipitates. The seminar will present what we can learn from DD simulations (and their limitations) about the plasticity of pure and alloyed materials. Ferritic steels used in extreme environments such as nuclear reactor cores is taken as a first illustration. Then, the fascinating effect discovered by Bauschinger is tackled: why materials are softer in compression after a first tensile loading?

This talk is part of the Surfaces, Microstructure and Fracture Group series.

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