Slip Circle Constructions for Dislocation Plasticity, with Special Reference to Nanoindentations

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• Prof. L M Brown, Surfaces, Microstructure and Fracture Group, Cavendish Laboratory
• Thursday 01 February 2007, 16:00-17:00
• Mott Seminar Room, Cavendish Laboratory, Department of Physics.

If you have a question about this talk, please contact Stephen Walley.

On general grounds, it is expected that plastic flow with increasing strain and length scale of inhomogeneity undergoes a laminar to rotational transition, rather like any fluid flow. When this is applied to indentation plasticity, one finds that rotational flow produces a density of geometrically necessary dislocations which can provide a quantitative account of the indentation size effect. But at very small indentations, laminar flow occurs, with build-up of material under the indenter. Combining these two flow patterns in parallel seems to provide a quantitative account of the observed hardness behaviour.

This talk is part of the Physics and Chemistry of Solids Group series.

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