Corrosion fatigue behavior of ultra-fine grained(UFG) copper produced by Equal Channel-Angular Pressing(ECAP) technique has been investigated in 1 kmol/m{sup}3 NaNO{sub}2 aqueous solution. A significant increase of the number of cycles to fracture was observed for UFG copper. In this case, two factors were considered. First, persistent slip bands(PSBs) where were the preferred areas of anodic dissolution in an aggressive solution, were not formed in UFG copper. Second, UFG copper was less susceptible to intergranular corrosion and corrosion fatigue than polycrystalline copper.
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