Deformation kinking in duplex titanium alloy with widmannstatten laths under high strain rates

Deformation kinking acts as an important complementary deforming mechanism which is usually discovered in low-symmetrical metallic materials with hexagonal close-packed (HCP) crystallographic structure. Interestingly, for titanium alloys, rather than taking place in α-Ti with HCP structure, deformation kinking prefers to occur in β-Ti with the body-centered cubic (BCC) structure of higher symmetry. in this paper, the duplex titanium alloy with the widmannstatten microstructure was prepared, and uniaxially compressed at a strain rate of 3000 s⁻¹. Kink bands are independently observed for the first time in duplex titanium alloy. The 30°<101¯0> KBs contain an unfavorable orientation for plastic deformation, while the KBs of about 35° misorientation angle possess a favorable orientation, which consist of two subordinate deformation bands, i.e. 20°<22¯01> and 15°<11¯01> respectively. The detailed analysis of KBs is of great significance for both the fundamental understanding of duplex titanium deformation and their potential engineering applications.