Role of twin boundaries and copper content on the mechanism of recrystallization in Ni-Cu alloys

Abstract

The evolution of microstructure and texture at the surface of the cold-rolled and annealed Ni-Cu alloys are strongly influenced by the Cu content. Effect of shear deformation leads to strong ND-rotated cube {001}<110> component at the surface along with Bs component and there is a strong correlation of the development of later component from that of the former. The addition of Cu suppresses the strength of {001}<110> component while enhancing the Bs component. The evolution of <110>, <100>, and <111> fibers in decreasing order of intensity are observed in both the cold-rolled and annealed condition. During recrystallization, Cu addition to Ni-Cu alloy enhances the twin density and suppresses the cube texture component. Annealing twin density is maximum for 60Ni-40Cu sample (8856/mm2), and it is approximately three times larger than other samples. Suppression of strong cube component during annealing is attributed to the formation of coherent twin boundaries, Bs component, and unfavorable conditions for oriented growth.