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Twining and Slip Activity in Magnesium <11-20> Single Crystal

Published online by Cambridge University Press:  31 January 2011

Gyu Seok Kim ,
Sangbong Yi ,
Yuanding Huang  and
Erica Lilleodden
Gyu Seok Kim
Affiliation:
qstone00@gmail.com, GKSS Research Center, Materials Mechanics, Institute of Materials Research, Geesthacht, Germany
Sangbong Yi
Affiliation:
sangbong.yi@gkss.de, GKSS Research Center, MagIC-Magnesium Innovation Center, Geesthacht, Germany
Yuanding Huang
Affiliation:
yuanding.huang@gkss.de, GKSS Research Center, MagIC-Magnesium Innovation Center, Geesthacht, Germany
Erica Lilleodden
Affiliation:
eric.lilleodden@scholarone.com, GKSS Research Center, Materials Mechanics, Institute of Materials Research, Geesthacht, Germany
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Abstract

Uniaxial μ-compression tests have been performed on single crystal Mg with a <11-20> compression direction, an orientation unfavorable for basal slip. Results show that the early stages of deformation proceed via both twinning and dislocation plasticity. Twinning leads to a reorientation of the crystal favorable for basal slip, typically with the <2-1-1-3> aligned with the compression direction. At a critical strain a large strain burst occurs, and is associated with both rapid propagation of the twin and the activation of basal slip within the twin. Such a mechanistic picture of the deformation behavior is revealed through SEM, EBSD and TEM characterization of the deformation structures.

Keywords

stress/strain relationshipMgdislocations

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