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Stochastic dislocation patterning during cyclic plastic deformation

A theory of the formation of persistent slip band and matrix structures

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Abstract

A dislocation dynamical theory is developed for the formation of dipole dislocation patterns during cyclic plastic deformation in single glide. The stochastic dislocation dynamics adopted is suitable to account, in terms of a fluctuating effective medium, for the effects of long-range dislocation interactions on a mesoscopic scale. The theory can explain the occurrence of a matrix structure and persistent slip bands as a result of evolutionary processes, it gives the intrinsic strain amplitudes and the characteristic wavelength of these structures, and it allows for an interpretation of the structural changes associated with changes of the deformation conditions. Quantitative results are in good agreement with experimental observations.

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  1. European Commission, Institute for Advanced Materials, TP 750, Joint Research Centre, I-21020, Ispra (Va), Italy

    P. Hähner

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Hähner, P. Stochastic dislocation patterning during cyclic plastic deformation. Appl. Phys. A 63, 45–55 (1996). https://doi.org/10.1007/BF01579745

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