Discrete dislocation dynamics simulations are used to investigate the dynamics of a driven dislocation line interacting with randomly distributed, incoherent oxide dispersoids that act as pinning centers in a bcc ferritic alloy. The dislocation line undergoes a depinning transition where the order parameter is the mean dislocation line velocity v, which increases in the depinning region from zero as v similar to(tau-tau(c))(beta) for external resolved shear stresses beyond a threshold value tau(c). The critical stress and critical exponents characterizing the depinning transition are determined numerically, and the observed dynamical behavior is compared with that of a depinning elastic string.
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