It was found that the strain part of X-ray line-broadening was generally anisotropic. This implied that neither the full-width at half-maximum in the Williamson-Hall plot, nor the Fourier coefficients in the Warren-Averback analysis, were smooth functions of the diffraction vector, g. On the basis of the dislocation model, modified Williamson-Hall and Warren-Averback procedures were suggested in which g and g2 were replaced by gvC and g2C, where C was the average dislocation contrast factor. The value of C could be determined for various crystal systems and dislocation types by using numerical methods which took account of the elastic constants of the material. The nature of the dislocations present could be determined by analysing the strain anisotropy.

Characterisation of Dislocation Types in a Plastically Deformed Aluminium-Base Alloy. E.Schafler, C.Sitkovitch, I.Dragomir, A.Rèvèsz, M.Zehetbauer, T.Ungár: Materials Science Forum, 2000, 321-324, 92-6