Effect of post-process and in-process cooling on wide-area stir zone processed via friction stir processing with pin overlapping

Abstract In the current investigation, influence of post-process and in-process cooling on microstructural, mechanical electrochemical behavior wide-area stir zone (WSZ) processed with overlapping friction processing (OL-FSP) was studied. The WSZ successfully prepared in Al5083 aluminum alloy using multi-pass (FSP) 50% pin under both conditions. FSP (PP-FSP) used solid CO 2 as media, whereas (IP-FSP) water media. microstructural investigations revealed that grain refinement is uniform each pass for IP-FSP resulted better than PP-FSP. Three different types intermetallic particles (needle-shaped Fe-containing, rod-shaped Mg-containing, very small Mg-containing boundary particles) were identified base OL-FSP samples. hardness observed to be constant across due refinement, sample has strength PP-FSP effect. elongation followed a similar trend hardness. findings corrosion resistance fine intermetallics.