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Developing high yield strength and ductility in low–cost Mg alloys using conventional plastic forming process is a tremendous challenge. Mg–Mn–based alloys have drawn considerable attention owing to their low–cost, high ductility and good corrosion resistance. However, the strength of Mg–Mn binary alloy is not satisfactory for industrial scale applications. In the present study, low content of Al alloying in Mg–1Mn alloy is the aim to obtain high strength and ductility of Mg–Mn–based alloys with low cost. Experimental results revealed that phase composition of the targeted Mg–1Mn–xAl (x = 0.3 wt%, 0.5 wt%, 1.0 wt%) alloys were composed of α-Mn + Al₈Mn₅, Al₈Mn₅ and Al₈Mn₅+Al₁₁Mn₄ phase, respectively. Al–Mn particles significantly refined the dynamically recrystallized (DRXed) grains. Among them, Al₈Mn₅ particles exhibited the most effective grain refinement. Therefore, Mg–1Mn–0.5Al alloy containing …