Microscale simulations were used to study the effects of the surface texture and plastic deformation upon surface roughness and dislocation density. The results of simulations of superconducting niobium showed that the intensity and the components of the surface texture had significant effects upon the plasticity-induced surface roughness and dislocation density. A weak surface texture developed a rough surface after plastic deformation. This was due to the different plastic shear-rates and directions behaviour of grains with different orientations. Some grains, with a specific orientation, experienced more plastic deformation and therefore developed an intragrain surface roughness due to the development of microtexture and inhomogeneous plastic deformation within the grain. Due to inhomogeneous plastic deformation, the dislocation density was not only different in grains with different orientations but was also inhomogeneous within a grain.

A Quantitative Study of the Effect of Surface Texture on Plasticity Induced Surface Roughness and Dislocation Density of Crystalline Materials. A.R.Zamiri, F.Pourboghrat, T.R.Bieler: Journal of Applied Physics, 2008, 104[8], 084904