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Upon intensive investigation during the recent years, severe plastic deformation (SPD) has been commonly accepted as a strong tool for improving mechanical properties of metallic materials. The interest in commercial use of SPD materials with superior properties addresses the issue of scaling up the SPD methods. In this regard, methods that can provide SPD conditions in billets with large dimensions become of prime interest. Twist extrusion (TE) is such a process, whereby large strains are accumulated owing to repeated extrusion through a die that imposes shearing stresses. Despite a few studies of TE in the literature, many features of the process's nature remain unclear or even unknown. In the current article, we have studied an important effect of TE named “cross flow” that previously received scarce attention. By performing both experiments and simulations, we elucidated the mechanism of the …