Commercially pure α-Ti has been plastically deformed by rolling to strains up to 97%. Optical and electron metallographic observations on the deformed material have then been related to changes in the hardness and texture. It is concluded that, at strains of up to 20%, strain twinning is the major mode of deformation, but at greater strains slip becomes dominant until eventually shear banding occurs at 94% strain. Even after 97% deformation the material is still ductile and the final texture forms independently of deformation twinning. The work-hardening rate is lower than would be expected for fcc and bcc metals deformed at the same homologous temperature.
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