Abstract
Two special methods, cyclic extrusion compression (in short - CEC) and equal channel angular extrusion (in short - ECAE) have been used for deformation of armco iron, AlMg5 and AlCu4Zr to very large strains, exceeding therange of deformations, obtained by conventional plastic working processes. Above the true strain of about 14 the transformation of typical microstructure, with the small misorientation between subgrains, to microstructure with the large misorientation and nano-size grains has been observed. The results indicate also that the microstructure transformation proceeds by development of microstructure bands and their mutual crossing and division into the nanometric grains. The mechanical properties of obtained nonometals show considerable increase in comparison to the values found in conventionally deformed aluminium and iron alloys.
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