| Abstract |
| The microstructure, texture evolution, and room temperature formability of warm-rolled and coldrolled AZ31 magnesium sheets were investigated in this study. The localized deformation regions, i.e., shear bands, formed during warm-rolling and cold-rolling mainly provide nucleation sites for recrystallization, but the orientation of the recrystallized grains nucleated on the shear bands changes depending on the rolling procedure. EBSD analysis clearly indicated that the large accumulated strain produced by cold-rolling can activate basal and non-basal slip and lead to the rotation of the recrystallized grains from their original orientation. In this study, the resulting texture of the cold-rolled AZ31 sheet was weaker than that of the warm-rolled sheet, and as a consequence, the room temperature formability of the cold-rolled AZ31 sheet doubled from 2.2 to 4.2 mm in the Erichsen index. Interestingly, the simple cold-rolling and subsequent recrystallization annealing produced a ‘rare earth texture’, in which the peaks of the basal pole figure were split and spread in the rolling direction. This texture was obtained without the addition of rare earth elements or severe plastic deformation.
(Received August 27, 2018; Accepted September 7, 2018) |
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| Key Words |
| magnesium alloy, cold-rolling, texture, stretch formability, recrystallization |
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