| Abstract Scope |
Developing high yield strength and ductility in low-cost Mg alloys using conventional plastic forming process is a tremendous challenge. In the present study, low content of Al alloying in Mg-1Mn alloy is the aim to obtain high strength and ductility of Mg-Mnbased 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 single-phase Al8Mn5 particles possessed the finest microstructure and exhibited the best mechanical properties. The high performance of the alloy was mainly attributed to the fine DRXed grains according to the Hall-Petch effect and to the large amount of fine Al8Mn5 particles through the dispersion strengthening. |