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Grain size dependent texture evolution in severely rolled pure copper

Abstract : Large strain rolling - up to 97% thickness reduction - was carried out on pure copper with two different initial grain sizes: coarse-grained (CG, 24 mu m) and ultrafine-grained (UFG, 360 nm). After rolling, classical copper-type rolling texture was obtained for the CG copper while a brass-type rolling texture was observed in the starting UFG copper, obtained by eight-pass equal channel angular pressing at room temperature prior to rolling. Using the Viscoplastic Self Consistent polycrystal model, it is found that the deformation mechanism at large rolling strain is grain size dependent and a change in the major slip mode has a large impact on the type of deformation texture. The brass-type texture in the UFG material can be simulated using \111\ <11<(2)over bar>> partial slip together with \111\ <1<(1)over bar>0> slip and a small amount of twinning; for the CG material, only \111\ <1<(1)over bar>0> slip is needed to reproduce the copper-type rolling texture. Further, it is found that the polyaystal deformation condition approaches Taylor behavior in the UFG material whereas much more strain heterogeneity is present in rolling of the CG copper. By orientation imaging electron microscopy the geometrically necessary dislocation (GND) density is found to be decreasing in the UFG rolled samples while increasing in the CG case. This tendency corroborates the texture simulation parameters concerning strain heterogeneity.
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C. F. Gu, M. Hoffman, Laszlo S. Toth, Yu Dong Zhang. Grain size dependent texture evolution in severely rolled pure copper. Materials Characterization, Elsevier, 2015, 101, pp.180-188. ⟨10.1016/j.matchar.2015.02.003⟩. ⟨hal-01514673⟩



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