Abstract
The influence of equal channel angular pressing (ECAP) on the microstructure, texture evolution and mechanical properties of extruded Mg-5.0Zn-0.5Ca-0.3Mn (weight percent) alloy has been systematically investigated in the current study. A typical ultra-fine grained (UFG) structure is obtained in the as-ECAPed alloy for 4 passes, due to a completed recrystallization process. With the increasing ECAP pass, the conventional basal texture can be gradually changed to an asymmetric non-basal texture with its basal plane inclined to normal and transverse directions ∼45°, which is related to the typical shear mode, leading to an obvious increase of Schmid factor for the activation of basal slip system. The room-temperature tensile yield strength, microhardness and ductility of extruded alloy are simultaneously improved by successive ECAP processing, which is derived from the grain refinement and texture modification.
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