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 alpha-Ti with HCP structure, deformation kinking prefers to occur in beta-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 degrees<10<(1)over bar>0> KBs contain an unfavorable orientation for plastic deformation, while the KBs of about 35 degrees misorientation angle possess a favorable orientation, which consist of two subordinate deformation bands, i.e. 20 degrees<2<(2)over bar>01> and 15 degrees<1<(1)over bar>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.