Weakening of through-thickness texture gradient in tantalum plates by newly developed dynamic offsets and shear force adjustment rolling

Traditional symmetrical rolling often induces through-thickness gradient microstructures and textures. In this study, ultra-high purity (99.999 wt.%) tantalum (Ta) served as a model material to address the texture gradient issue by employing dynamic offsets and shear force adjustment rolling (DS rolling) as an advanced rolling technique. The strain and stress distributions in Ta plates for DS rolling and symmetrical rolling processes were analyzed using Deform 3D software. Through-thickness textures and microstructures were characterized via electron backscatter diffraction. The results revealed that DS rolling effectively solved the problem of texture gradient by increasing the average shear strain from 0.05 to 0.56. In turn, the shear stress reduced the energy storage orientation dependence of {100} and {111} grains. Furthermore, DS rolling refined the recrystallized grains on an average of 30.9%.