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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 Rolfe
The 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 magazine

Volume

96

Issue

3

Pagination

301 - 309

Publisher

Taylor & Francis

Location

Abingdon, Eng.

ISSN

1478-6435

eISSN

1478-6443

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2016, Taylor & Francis