Role of glide systems in channel die compression of commercially pure titanium alloy

Abstract

Plastic deformation process of Ti alloys depends on the competition of active deformation modes: slip and twinning. The specific deformation mechanism depends on the availability of the specific deformation modes as well as on the critical resolved shear stress for slip and the twin activation stress. Effort has been made to provide information on the different slip systems other than prismatic slips, which get activated during the channel die compression process. It is found that, though at the initial stage of deformation, prismatic slip is prevalent, but other slip systems, especially pyramidal types, also appear at the later stage of deformation. Transmission electron microscopy results confirm the presence of pyramidal slips beside prismatic ones. It is also observed that twining does not take place in those grains having the most stable orientation as per the hexagonal close packed system. Information on the critical resolved shear stresses of different glide systems for T40 is also provided.

Keywords:

• Ti alloy
• Plastic deformation
• EBSD
• TEM
• CRSS

The present work was supported by the Federation of Research for Aeronautic and Space [Fédération de Recherche pour l’Aéronautique et l’Espace Thème Matériaux pour l’Aéronautique et l’Espace: project optimisation de la mise en forme d’alliage de titane (OPTIMIST)].