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A disclination model for twinning and de-twinning of nanotwinned copper
journal contribution
posted on 2016-01-01, 00:00 authored by C Xie, Q Fang, L Li, J Chen, M Zhang, Y Liu, Bernard RolfeBernard RolfeThe twinning and de-twinning processes within grains of nanotwinned copper (nt-Cu) are schematically demonstrated using the concept of wedge disclination quadrupoles. The stable twin nucleus size and the equilibrium equation of the applied shear stress and twin width during twin growth are obtained. The dependence of the critical resolved shear stress for twinning on the grain size, which conforms to the classic Hall–Petch relationship, is theoretically modelled. Additionally, the disclination quadrupole model for de-twinning is used to interpret the strength softening in nt-Cu. Relative to the classic kinetic and energetic models, this novel approach is more compatible with the experiments.
History
Journal
Philosophical magazineVolume
96Issue
3Pagination
301 - 309Publisher
Taylor & FrancisLocation
Abingdon, Eng.Publisher DOI
ISSN
1478-6435eISSN
1478-6443Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2016, Taylor & FrancisUsage metrics
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No categories selectedKeywords
twinningde-twinningdisclination quadrupolenanotwinned copperScience & TechnologyTechnologyPhysical SciencesMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringPhysics, AppliedPhysics, Condensed MatterMaterials SciencePhysicsDEFORMATION TWINSMAXIMUM STRENGTHDISLOCATIONNUCLEATIONMETALSGENERATIONBOUNDARIESMECHANISMGROWTH
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