Observation of twin boundary migration in copper during deformation

A previous investigation produced evidence that twin boundaries in annealed copper were a significant source of dislocations during the initial stages of plastic flow. The character of the dislocation source was unknown, but it was hypothesized that twin boundaries could be non-regenerative dislocat...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2004-05, Vol.372 (1), p.173-179
Main Authors: Field, D.P., True, B.W., Lillo, T.M., Flinn, J.E.
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Copper
Defects and impurities in crystals
microstructure
Deformation
Deformation and plasticity (including yield, ductility, and superplasticity)
Electron backscatter diffraction (EBSD)
Exact sciences and technology
Grain and twin boundaries
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Metals. Metallurgy
Physics
Structure of solids and liquids
crystallography
Twin boundaries
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Summary:A previous investigation produced evidence that twin boundaries in annealed copper were a significant source of dislocations during the initial stages of plastic flow. The character of the dislocation source was unknown, but it was hypothesized that twin boundaries could be non-regenerative dislocation sources that would cause migration of the boundary during plastic deformation. Channel die deformation and intermittent orientation imaging were performed on split specimens of pure copper in an attempt to observe twin boundary migration. Approximately 15% of the twin boundaries were observed to migrate beyond that expected from the imposed strain. The data support the hypothesis that twin boundaries can serve as dislocation sources.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2003.12.044