Shear localization behavior in hat-shaped specimen of near-? Ti?6Al?2Zr?1Mo?1V titanium alloy loaded at high strain rate

Abstract The microstructure characteristics in early stage shear localization of near-? Ti?6Al?2Zr?1Mo?1V titanium alloy were investigated by split Hopkinson pressure bar (SHPB) tests using hat-shaped specimens. microstructural evolution and deformation mechanisms specimens revealed electron backscattered diffraction (EBSD) method. It is found that the nucleation expansion adiabatic band (ASB) are affected both geometric structural factors. increase dislocation density, structure fragment temperature rise deformation-affected regions provide basic conditions. In addition to slips, extension twins detected region also play a critical role fragmentation due twin-boundaries effect. Interestingly, sandwich imposes crucial influence on ASB, which finally becomes mature wide ASB dynamic deformation. However, much larger width, middle possible serve as favorable sites for crack initiation.