Microstructure, texture and mechanical properties of a friction-stir-processed (FSPed) Mg-1Al-0.3Ca-0.3Mn-0.6Zn (w/%) alloy were investigated in the present work. During FSP, complete dynamic recrystallization (DRX) takes place in the coarse primary a-Mg matrix and a considerable grain refinement is achieved. Furthermore, DRXed grain sizes increase with an increase of the rotation speed from 1000 min-1 to 1600 min-1 , which is attributed to the integrated effect of the strain rate and thermal input. After FSP, a strong {0001} basal texture is formed, with the intensity ranging from 83.64 to 105.19. Compared to the base metal, the elongation is significantly enhanced, by »158 %, while the ultimate tensile strength and yield strength are reduced. The variation in the mechanical properties is mainly due to the grain refinement and strong {0001} basal texture obtained with FSP.