Asymmetric and symmetric rolling of magnesium: Evolution of microstructure, texture and mechanical properties

Authors
Biswas, SomjeetKim, Dong-IkSuwas, Satyam
Issue Date
2012-07-30
Publisher
ELSEVIER SCIENCE SA
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.550, pp.19 - 30
Abstract
In the present study, asymmetric rolling was carried out for incorporating a shear component during the rolling at different temperatures, and was compared with conventional (symmetric) rolling. The microstructures were investigated using electron back-scatter diffraction (EBSD). The strain incorporated was compared with the help of grain orientation spread (GOS). GOS was eventually used as a criterion to partition the microstructure for separating the deformed and the dynamically recrystallized (DRX) grains. The texture of the partitioned DRX grains was shifted by similar to 30 degrees along the c-axis from the deformed grains. The mechanism of dynamic recrystallization (DRX) has been identified as continuous dynamic recovery and recrystallization (CDRR). The partitioned deformed grains for the higher temperature rolled specimens exhibited a texture similar to the room temperature rolled specimen. The asymmetric rolling introduces a shear component which shifts the texture fibre by similar to 5-10 degrees from the conventional rolling texture. This led to an increase in ductility with little compromise on strength. (c) 2012 Elsevier B.V. All rights reserved.
Keywords
CHANNEL ANGULAR EXTRUSION; DYNAMIC RECRYSTALLIZATION; DEFORMATION TEXTURES; TENSILE PROPERTIES; ALLOY; SUPERPLASTICITY; ECAE; OPTIMIZATION; DUCTILITY; BEHAVIOR; CHANNEL ANGULAR EXTRUSION; DYNAMIC RECRYSTALLIZATION; DEFORMATION TEXTURES; TENSILE PROPERTIES; ALLOY; SUPERPLASTICITY; ECAE; OPTIMIZATION; DUCTILITY; BEHAVIOR; Asymmetric rolling; Magnesium; Texture; Continuous dynamic recovery and recrystallization (CDRR); Mechanical property
ISSN
0921-5093
URI
https://pubs.kist.re.kr/handle/201004/129052
DOI
10.1016/j.msea.2012.03.099
Appears in Collections:
KIST Article > 2012
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