Abstract
IntroductionIt is wellknown that above a certain grain size limit ( *20nm)the strength of materials increases with decreasing grain size[1, 2]. This feature has initiated a considerable current interestin the production and properties of ultrafine-grained (UFG)materials. The most attractive method for producing UFGmetals in bulk form is through the application of severe plasticdeformation (SPD) [3, 4] using procedures such as equal-channel angular pressing (ECAP) [ 5]. It has been shown fordifferent pure face-centered cubic (fcc) metals processed byECAP that the dislocation density increases while the grainsize decreases with increasing strain and ultimately theseparameters reach saturationvalues [ 6]. Recently,it was shownthatprocessing byECAPleads to an extremely highsaturationdislocation density in pure silver ( *46 ± 5 9 10
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