Equal-channel angular pressing (ECAP) was conducted on an Al-1%Mg-0.2%Sc alloy using a die having a channel angle (Phi) of 90degrees but with two different angles, 0degrees and 90degrees, for the outer arc of curvature (Psi). Microstructures were observed by optical microscopy and transmission electron microscopy to examine the effect of Psi. Tensile tests were also conducted and the ductility was examined for the ECAP samples processed with the two different angles, Psi = 0degrees and Psi = 90degrees. It is shown that the microstructure was more homogeneous for Psi=0degrees than Psi = 90degrees. However, larger ductility was obtained for the samples processed with Psi = 90degrees than Psi = 0degrees.