Effects of initial textures on the microstructure and annealing behavior of tantalum after dynamic plastic deformation

Abstract

Two tantalum plates with strong 〈110〉// loading direction (T110 sample) and 〈111〉// loading direction (T111 sample) texture, respectively, were processed to 70% reduction by means of dynamic plastic deformation (DPD). Subsequently, the microstructure and texture after DPD and annealing were investigated in detail. Results showed that yield strengths of T110 and T111 samples during DPD are 683.07 MPa and 546.12 MPa, respectively. The microstructure of DPD samples consists mainly of {100} and {111} grains, and grains in T111 DPD sample are arranged alternately. Compared with T110 DPD sample, the deformation degree difference between {111} and {100} grains is slight of T111 DPD sample, which can be illustrated by kernel average misorientation and geometrically necessary dislocations distribution. Relative Schmidt factor of {111} grain in T110 DPD sample is 22.54%, indicating that {111} grain in T110 DPD sample is likely to activate single-slip. As an unstable texture, the {111} initial texture, can be chosen for the DPD preparation of Ta to obtain a relatively excellent microstructure.