{1 1 (2)over-bar 4} deformation twinning in pure Ti during dynamic plastic deformation

The type of deformation twins in purity titanium after dynamic plastic deformation (DPD) and quasi-static compression (QSC) at room temperature is investigated by electron backscatter diffraction techniques, respectively. DPD with a high strain rate (4.5-5 x 10(2)/s) activates more deformation twins in Ti. Four types of twins have been identified in DPD samples, while three types of twins in QSC samples. The (1 1 (2) over bar 4) twinning is only observed in DPD samples, associating with the {1 1 (2) over bar 2} twinning. The misorientations of {1 1 (2) over bar 2}-{1 1 (2) over bar 4} variant pairs are 12-13 degrees, suggesting they follow the same misorientation profile (0 1 (1) over bar 0) plane and rotated direction. (C) 2012 Elsevier B.V. All rights reserved.