The microstructure of f.c.c. metals (Al, Cu, Ni) and alloys (Al-Mg) processed by severeudplastic deformation (SPD) methods is studied by X-ray diffraction line profile analysis. It isudshown that the crystallite size and the dislocation density saturate with increasing strain.udFurthermore, the Mg addition promotes efficiently a reduction of the crystallite size and anudincrease of the dislocation density in Al during the SPD process. The yield strength correlatesudwell with that calculated from the dislocation density using the Taylor equation, therebyudindicating that the main strengthening mechanism in both pure metals and alloys is theudinteraction between dislocations.
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