A Study of the Metallurgical and Mechanical Properties of Friction-Stir-Processed Cu

Friction stir processing (FSP), a severe plastic deformation process, was applied on pure Cu to obtain zone with very fine grain size. Yet, when FSP is used, the as wide diameter of shoulder at upper surface weld and markedly narrower near its opposite surface. This property, well differences between advancing side retreating side, makes it impossible uniform cross-section far microstructure mechanical properties are concerned. For these reasons, new approach proposed in which material processed both sides, thus yielding wider, rectangular more homogenous from all specimens were machined out. Processing sides eliminated any microstructural difference lower least within gauge length’s creep specimens. Although refinement detected, friction-stir-processed (FSP’ed) inferior relative those parent material. The TEM study reported current paper revealed existence nanosized grains FSP’ed due dynamic recrystallization (DRX) occurring during stage. Because X-ray inspection fractography showed that free defects, may not comply Hall–Petch relation dislocation density caused by XRD FSP. inverse effect also be considered an assistive mechanism property deterioration.