On Basal slip and basal twinning in sapphire (α-Al 2O 3)—II. A new model of basal twinning

Based on a new model for basal slip in sapphire developed in Part I of this series of papers, the formation of a basal twin is considered. It is shown that deformation twinning is a natural outgrowth of the present model of slip when the material is deformed in a particular regime of temperature and...

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Bibliographic Details
Published in:Acta materialia 1996-05, Vol.44 (5), p.2153-2164
Main Authors: Pirouz, P., Lawlor, B.F., Geipel, T., Bilde-Sørensen, J.B., Heuer, A.H., Lagerlo¨f, K.P.D.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Defects and impurities in crystals
microstructure
Exact sciences and technology
Grain and twin boundaries
Physics
Structure of solids and liquids
crystallography
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Summary:Based on a new model for basal slip in sapphire developed in Part I of this series of papers, the formation of a basal twin is considered. It is shown that deformation twinning is a natural outgrowth of the present model of slip when the material is deformed in a particular regime of temperature and stress. The model is based on the glide of a leading partial dislocation on a basal slip plane and double-cross-slip to the next-but-one slip plane. The model predicts a Type-II twin, i.e. a twin related to the matrix by a 2-fold axis along the direction of shear, η 1 = [101¯0〉, and lying in the twin/matrix interface.
ISSN:1359-6454
1873-2453
DOI:10.1016/1359-6454(95)00265-0