Abstract
AZ31 Mg alloy was processed by accumulative roll-bonding (ARB) and hot rolling (HR), respectively, followed by annealing. Layered bimodal structures characterized by an alternative distribution of fine-grained layers and coarse-grained layers were obtained in the ARB samples, while mixed bimodal structures were achieved in the HR samples. The ARB samples have superior combinations of high strength and good elongation compared to the HR samples, indicating a clear effect of layered bimodal structures on mechanical properties of the alloy. The strength of the ARB samples is related to the grain size; while the ductility is attributed to the activity of non-basal slip and the strong backstress.
Highlights
AZ31 Mg alloy was processed by accumulative roll-bonding (ARB) and hot rolling (HR), respectively, followed by annealing
The presence of fine grains and coarse grains suggests that dynamic recrystallization (DRX) occurred during rolling, which was frequently reported in Mg alloys[15,22]
The 180 °C and 250 °C annealed ARB samples have bimodal microstructures, these structures are different from other bimodal microstructures with heterogeneous grain structures in Mg alloys[14,15,16,17]
Summary
AZ31 Mg alloy was processed by accumulative roll-bonding (ARB) and hot rolling (HR), respectively, followed by annealing. After ARB and HR processing, the yield strengths are significantly improved to 288 MPa and 267 MPa, and the elongations decreased to 8% and 4%, respectively, which is similar to previously observed in deformed Mg alloys[25,26]. For the HR samples, the strengths decrease and the elongations increase gradually with annealing temperatures and the work-hardening rates continuously decrease after yielding (inset of Fig. 4(b)), which are similar to previous observations[27].
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