Novel deformation structures of pure titanium induced by room temperature equal channel angular pressing

Novel deformation structures of commercial pure (CP) Ti induced by equal channel angular pressing (ECAP) at room temperature have been studied by electron backscattering diffraction (EBSD). All the deformation twins occurring in CP Ti, {101¯1}, {112¯1}, {101¯2} and {112¯2} have been revealed surprisingly in one original grain as first, secondary or third generation twins. 3 variants of {101¯2} twins have been identified. The deformation mechanism of CP-Ti during ECAP at room temperature in comparison to the ECAP at elevated temperatures is discussed.