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Plasticity in body-centred cubic (BCC) metals, including dislocationinteractions at grain boundaries, is much less understood than in face-centredcubic (FCC) metals. At low temperatures additional resistance to dislocationmotion due to the Peierls barrier becomes important, which increases thecomplexity of plasticity. Iron-silicon steel is an interesting, model BCCmaterial since the evolution of the dislocation structure inspecifically-oriented grains and at particular grain boundaries havefar-reaching effects not only on the deformation behaviour but also on themagnetic properties, which are important in its final application as electricalsteel. In this study, two different orientations of micropillars (1, 2, 4microns in diameter) and macropillars (2500 microns) and their corresponding bicrystals are analysed after compression experiments with respect to the effectof size on strength and dislocation structures. Using different experimentalmethods, such as slip trace analysis, plane tilt analysis and cross-sectionalEBSD, we show that direct slip transmission occurs, and different slip systemsare active in the bi-crystals compared to their single-crystal counterparts.However, in spite of direct transmission and a very high transmission factor,dislocation pile-up at the grain boundary is also observed at early stages ofdeformation. Moreover, an effect of size scaling with the pillar size in singlecrystals and the grain size in bi-crystals is found, which is consistent withinvestigations elsewhere in FCC metals.

Deformation of micrometer and mm-sized Fe2.4wt.%Si single- and bi-crystals with a high angle grain boundary at room temperature