| EBSD study of copper microstructure fragmentation under condition of high-speed deformation by dynamic channel angular pressing (DCAP) is presented. It has been shown that, in addition to regular fragmentation, extensive deformation twinning occurs during single DCAP pass. A local analysis of the misorientation evolution at individual twin boundaries during plastic deformation was conducted. Based on this analysis, the relationship between the deviation from exact twin misorientation and the strain, at which the twin has been nucleated, is suggested. The deformation twins are shown to appear mostly at a final stage of deformation, though the twinning seems to occur over whole pass of DCAP. |
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