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The fundamental interactions between an edge dislocation and a random solidsolution are studied by analyzing dislocation line roughness profiles obtainedfrom molecular dynamics simulations of Fe0.70Ni0.11 Cr0.19 over a range ofstresses and temperatures. These roughness profiles reveal the hallmarkfeatures of a depinning transition. Namely, below a temperature-dependentcritical stress, the dislocation line exhibits roughness in two differentlength scale regimes which are divided by a so-called correlation length. Thiscorrelation length increases with applied stress and at the critical stress(depinning transition or yield stress) formally goes to infinity. Above thecritical stress, the line roughness profile converges to that of a random noisefield. Motivated by these results, a physical model is developed based on thenotion of coherent line bowing over all length scales below the correlationlength. Above the correlation length, the solute field prohibits such coherentline bow outs. Using this model, we identify potential gaps in existingtheories of solid solution strengthening and show that recent observations oflength-dependent dislocation mobilities can be rationalized.

Length scales and scale-free dynamics of dislocations in dense solid solutions