Microstructure and texture evolution during cold rolling and annealing of Ni3Fe alloy

Just-stoichiometric Ni3Fe alloy with L12 ordered and A1 (fcc) disordered structures were cold rolled and annealed below and above the critical ordering temperature (Tc) to study the effects of ordered and disordered structures on texture and microstructure evolution during deformation and recrystallization. The cold rolling textures of the Ni3Fe alloy basically showed a copper (pure-metal) type irrespective of ordered or disordered state before cold rolling. However, for the rolling texture of the initially ordered specimen, Bs {0 1 1}〈2 1 1〉 component was enhanced in comparison with C {1 1 2}〈1 1 1〉 and S {1 2 3}〈6 3 4〉 components. The intensity of the rolling texture was weaker in the initially ordered structure than in the initially disordered structure. Also, the intensity of a cube {0 0 1}〈1 0 0〉 texture, which was formed after recrystallization above Tc, was significantly reduced in the initially ordered structure. During annealing, the Ni3Fe alloy slightly hardened up to Tc and then softened rapidly, regardless of ordered or disordered state before cold rolling. It was also found that the recrystallization occurred faster and at lower temperature in the initially ordered structure than in the initially disordered structure.