The density and the character of dislocations in cubic and hexagonal polycrystals determined by X-ray diffraction

Gubicza, Jenő and Ribárik, Gábor and Goren-Muginstein, G. R. and Rosen, A. R. and Ungár, Tamás (2001) The density and the character of dislocations in cubic and hexagonal polycrystals determined by X-ray diffraction. In: International Conference on the Fundamentals of Plastic Deformation, 2000. június 19-22., GAITHERSBURG, MD.

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Abstract

The density and the character of dislocations in cubic and hexagonal polycrystals were determined by a new procedure of X-ray diffraction profile analysis. The anisotropic strain broadening of diffraction profiles was accounted for by dislocation contrast factors. The screw or edge character of dislocations in a severely deformed copper specimen was determined by analysing the dislocation contrast factors. Comparing the contrast effect of the possible dislocation slip systems in hexagonal crystals with that determined experimentally for a sintered tungsten carbide sample, it was found that the dominant slip system in this specimen is < 1120 > {0001}. The dislocation density was calculated for both samples by the modfied Warren-Averbach procedure.

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