THE CORRELATION BETWEEN GRAIN BOUNDARY CHARACTER AND INTERGRANULAR CORROSION SUSCEPTIBILITY OF 2124 ALUMINUM ALLOY

The effects of grain boundary character on the intergranular corrosion susceptibility of 2124 aluminum alloy were examined. In the study, the alloy was heat treated at 540ºC and corrosion tested according to ASTM G110 standards. After obtaining grain orientations from the automated Electron Back-Scatter Diffraction (EBSD), both grain boundary character and grain boundary plane distributions were analyzed. Results show that low-angle boundaries and boundaries with a sigma-3 or sigma-7 coincident site lattice relationship tend to have a higher corrosion resistance than other random boundaries