Formation of fivefold deformation twins in an ultrafine-grained copper alloy processed by high-pressure torsion

Fivefold deformation twins (DTs) are formed in an ultrafine grain, with a size of ∼100 nm, of a Cu–16 at.% Al alloy processed by high-pressure torsion. Formation occurs through the sequential emission of partial dislocations from grain boundaries and other multiple twin boundaries. These observation...

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Bibliographic Details
Published in:Scripta materialia 2011-02, Vol.64 (3), p.249-252
Main Authors: An, X.H., Lin, Q.Y., Wu, S.D., Zhang, Z.F., Figueiredo, R.B., Gao, N., Langdon, T.G.
Format: Article
Language:English
Subjects:
Aluminum
BOUNDARIES
COPPER ALLOYS (40 TO 99.3 CU)
Copper base alloys
Cu–Al alloy
DEFORMATION
DISLOCATIONS
Emission
EMISSIONS
Fivefold deformation twin
GRAIN BOUNDARIES
GRAIN SIZE AND SHAPE
Grains
HIGH PRESSURE
High-pressure torsion
Torsion
TWIN BOUNDARIES
Twinnability
Ultrafine grains
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Summary:Fivefold deformation twins (DTs) are formed in an ultrafine grain, with a size of ∼100 nm, of a Cu–16 at.% Al alloy processed by high-pressure torsion. Formation occurs through the sequential emission of partial dislocations from grain boundaries and other multiple twin boundaries. These observations confirm the emission of partial dislocations from multiple-fold nodes which can be attributed to increased twinnability via the introduction of Al atoms which lower the driving force for partial emission.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2010.10.012