Selection criterion for {112} twinning in rolled pure titanium

Two sets of rectangle samples with different length/width ratios were prepared and subjected to uniaxial compression in the normal direction of rolled pure titanium. Results from Electron backscatter diffraction (EBSD) show that the produced {1122} twins in the two sets of samples exhibit different orientations, which is related to the variant selection of twinning behaviors with respect to the length/width ratios of the samples. The variant selection criterion is investigated in terms of the Schmid factors and contribution of the active twins to external strain, which indicates that the variants resulting in the elongation along the longer direction of the sample were unfavorable.