Small-angle neutron scattering measurements of deformed single crystals were performed over a wave-vector transfer range of 0.0655 to 1.32/nm. The study included 4 samples which had been deformed in compression at room temperature, along the [110] direction, to reductions in thickness of 6.8, 15.6, 35.0 or 54.3%. Comparisons were made with a non-deformed reference sample. The response of the reference sample followed the Porod law at the lowest wave-vector transfer value and was, at least partially, the result of scattering from the external surfaces of the sample. The radially averaged net cross-sections were found to increase with increasing deformation, while the power-law exponent decreased from about 3 to about 2.2 with increasing deformation. The scattering response of the 2 most deformed samples was noticeably anisotropic. An analysis of this anisotropy revealed strong scattering perpendicular to the {111} dislocation slip planes; in agreement with theory. Bulk-averaged edge dislocation densities that varied systematically from about 1010 to 5 x 1010/cm2 were deduced from the data.

B.J.Heuser: Journal of Applied Crystallography, 1994, 27[6], 1020-9