ROLLING TEXTURES OF PURE NICKEL, NICKEL-IRON AND NICKEL-COBALT ALLOYS

The rolling texture of heavily rolled pure Ni has been found to be similar to the rolling texture of deformed pure Cu. The textures of Ni-Fe alloys with up to 40% Fe, are similar amongst themselves and also to that of pure Ni. The Ni-Co alloys with up to 30% Co show pure metal-type rolling texture, while the Ni-60% Co alloy shows alloy-type texture. The rolling texture of the Ni-40% Co alloy lies in between these two extremes. The similarity of the deformation textures of pure Ni and Ni-Fe alloys can be explained due to only a marginal variation of the stacking-fault energy of Ni as a function of Fe-content. The texture transition in the Ni-Co alloys has been attributed to the additional effect of the incidence of twinning caused by the sharp decrease of stacking fault energy of Ni by Co-addition.