Twinning in pure Ti subjected to monotonic simple shear deformation

► Total and separated twin fractions depend on initial texture and test orientation. ► Twinning is an active mechanism for grain fractioning even for low twin fractions. ► RSS analyses correlate with twin fractions and can explain twin occurrence. ► TEM confirms the presence of only 101¯2 and 112¯2 twins. ► TEM reveals no secondary twins.