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.

Automated summary

This study investigates the deformation yielding mechanism in a duplex titanium alloy and reports the independent observation of kink bands in this alloy for the first time. The 30 degrees<10<(1)over bar>0> KBs show an unfavorable orientation for plastic deformation, while the KBs with a misorientation angle of about 35 degrees have a favorable orientation and consist of two subordinate deformation bands. The detailed analysis of KBs is important for understanding duplex titanium deformation and its potential engineering applications.