Texture evolution of a commercial-purity titanium during cold rolling was studied by means of X-ray diffraction and electron back-scattered diffraction. Twinning was identified to significantly contribute to deformation up to reductions of about 50%. Based upon initial texture of the material investigated and twinning modes available in hexagonal close-packed structures, the measured texture evolution could be interpreted in terms of (i) compressive twinning ({11•2}<11•¯3>) within the 2 predominant initial texture components B ({00•1}<10•0>±40°TD) and E ({00•1}<11•0>±40°TD) and (ii) followed by tensile twinning ({10•2}<10•¯1>) in the then-favorably reoriented twinned part. Reduction of grain size at high deformation inhibited further twinning and resulted in a stable texture evolution driven exclusively by dislocation slip. During cold rolling, the crystals of the initial texture component B first rotate to orientation M ({01•0}<2¯1•2>) by compressive twinning (primary), and then orientation M rotated to orientation D ({00•1}<11•0>) by tensile twinning (secondary). Meanwhile, the crystals of the initial component E first rotated to the orientation M' ({14•3}<6¯5•3>) by compressive twinning (primary), and then orientation M' rotated to the orientation A ({00•1}<10•0>) by tensile twinning (secondary). At higher deformation levels, twinning was significantly depressed by strongly refined grain size, which resulted in the elimination of the transient texture components caused by slip.

Role of Deformation Twin on Texture Evolution in Cold-Rolled Commercial-Purity Ti. Y.Zhong, F.Yin, K.Nagai: Journal of Materials Research, 2008, 23[11], 2954-66