{11(2)over-bar-4} deformation twinning in commercial purity titanium at room temperature

Definitive evidence from both electron backscattered diffraction and transmission electron microscopy is shown for the existence of {1 1 (2)over-bar 4} twinning as a rare deformation twinning mode in coarse-grained commercial purity titanium after room temperature ballistic impact testing at 10(3)s(-1). Non-Schmid-based twin-type selection is demonstrated for {1 1 (2)over-bar 4} and the conjugate {1 1 (2)over-bar 2} deformation twinning modes in this material within grains where the c-axis is closely aligned to the loading direction. Limited Schmid-based twin variant selection is shown for {1 1 (2)over-bar 4} and {1 1 (2)over-bar 2} deformation twinning modes in this material. The occurrence of high area fractions of {1 1 (2)over-bar 4} twinning has relevance for high strain rate plasticity modelling of grains of textured titanium, compressed parallel to their c-axes.