Investigation of Cold Rolling Texture and Recrystallization Texture in NiW Substrates

NiW alloys were fabricated by cold isostatic pressing, the W content being 5, 7 and 9.3 at%, respectively. The NiW substrates were obtained by rolling assisted biaxially texturing. The cold rolling and recrystallization textures of NiW substrates were systematically studied by X-ray and EBSD, which revealed a variation of rolling texture in NiW substrates with increasing W content, which also influenced the copper (C) type and brass (B) type texture, as well as the transition between them. In addition, the recrystallization texture was influenced by the cold rolling texture. The main observations are: (1) Deformation twinning and orientation banding attributed to the cross slip and it is strongly related to the stacking fault energy which has a decisive effect on the texture transition from C to B type texture in NiW substrates with the W content increase. (2) The recrystallization cube texture is strongly related to the rolling texture. The C type texture was obtained in Ni5W substrates with 99% reduction, and was beneficial for the formation of the cube texture after recrystallization. The B type texture was obtained in Ni9W substrates with 99% reduction, and it was hard to obtain the cube texture, where a large number of annealing twins were formed during recrystallization process, leading to the formation of rotating cube texture, and thereby affecting the formation of sharp cube texture in Ni9W substrate.