Microstructure and texture evolution in cold-rolled W during annealing

Abstract

The tungsten(W) was prepared by cold isostatic pressing and sintering, and its characteristics were further enhanced by cold rolling in this paper. The microstructure and textural evolution of cold-rolled and annealed W were primarily studied, and the slip system and dislocations were also deeply researched. The study reveals that grain boundaries in cold-rolled W and samples annealed at 1200 K have small angles of misorientation and high kernel average misorientation (KAM) values, while samples annealed at 1500 K and 1800 K have high angles of misorientation and low KAM values. Low angle grain boundaries (GBs) promote dislocation transfer and improve ductility. After 1800 K annealing, W becomes nearly-equiaxed polyhedrons, with γ-fiber texture dominating. The rolling direction (RD) is better suited for plastic deformation than the transverse direction (TD), but plasticity deteriorates due to changes in microstructure.