Notch-texture strengthening mechanism in commercially pure titanium thin sheets

• Plastic deformation at the notch tip changed notch strengthening effects.
• Impact of texture on strength significantly depended on the stress states.
• Simultaneous presence of notch and basal texture strongly increased tear strength.
• Fracture mechanisms were affected by metallurgical and geometrical constraints.

Simultaneous effects of notch and texture on strengthening mechanisms of rolled thin sheets of commercially pure titanium were investigated. The presence of notch led to the restriction of deformation systems and different fracture behaviors compared to un-notched specimens. The loss of material’s ability to accommodate plastic deformation at the notch tip with increase in rolling reductions changed the notch strengthening phenomenon to the notch weakening one. At medium levels of deformation, due to the simultaneous development of a triaxial stress state and strong basal texture at the notch tip, a new strengthening mechanism which is called “notch-texture strengthening mechanism” led to a significant enhancement of tear strength. However, the lack of stress triaxiality in un-notched tensile specimens and a strong basal texture component in other notched specimens reduced the impact of strengthening. It was found that the restriction of deformation systems due to the c-axis compression condition at the notch tip was responsible for this strengthening mechanism.

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