Impact of phase transformation on mechanical properties anisotropy of commercially pure titanium

Effects of microstructure and texture, before and after phase transformation, on the anisotropy of the mechanical properties and fracture behaviors of commercially pure titanium were studied. Before phase transformation, due to the split distribution of basal texture the activation of different deformation systems led to mechanical properties anisotropy. Although the fracture mechanism in both specimens was voids nucleation, growth and coalescence, the shape, size and distribution of dimples were affected by active deformation systems. However, after phase transformation, basal plains in most grains were aligned with the transverse direction. This texture component led to the activation and restriction of deformation systems in the rolling- and transverse-directed specimens and the change of the fracture mechanism from semi-ductile fracture to brittle intergranular ones, respectively.

► Different texture components led to mechanical properties anisotropy. ► Equiaxed microstructures showed different ductile fracture mechanisms. ► The morphology of dimples was affected by the textures and loading directions. ► Brittle fracture mechanisms after α → β→ α transformation were observed.