Deformation substructure and texture evolution of (VCoNi)99.9C0.1 medium-entropy alloy under different rolling reductions

Abstract

The deformation substructures and texture characteristics of (VCoNi)99.9C0.1 medium-entropy alloy (MEA) upon the different rolling reductions were systematically investigated in this work. The rolling deformation caused the deviation of annealing twin orientation and thus led to the gradually reduced annealing twin variants. The dislocation induced-orientation analysis was carried out within the deformed grains, confirming the presence of three kinds of orientation spreads (type 1, type 2 and type 3). The dominant orientation spreads of type 1, type 2 and type 3 were emerged in a sequential order of low, medium and heavy strains, respectively. As strains progressed, the intensities of 111<12̅1> R1 and {111}<011̅> R2 components were significantly weakened, while {112}<111̅> Copper and {123}<634̅> S components were consistently persisted with the strengthening orientations. For the heavily deformed sample, the strong {110}<001> Goss and {110}<11̅2>Brass components were revealed and the maximum intensity was obtained at a location between Goss and Brass components, which were ascribed to the chemical short-range order-assisted planar slip. It was worth noting that the carbide particles show the weak effect on the texture components and intensity distribution. As increasing rolling reductions, rolling deformation led to the significant improvement of strength, due to the work hardening.