Wear tests were conducted on an aluminum Al-1050 alloy after processing by equal-channel angular pressing (ECAP). The results show that the coefficient of friction remains unchanged after processing by ECAP, but there is a decrease in the wear resistance and a mass loss that increases with increasing numbers of ECAP passes. The results are consistent with a wear mechanism map and confirm the occurrence of a severe wear mechanism. The decreasing wear resistance after ECAP is attributed to the significant grain refinement introduced by ECAP and the lack of a strain hardening capability.