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A convergent-beam electron diffraction study of strain homogeneity in severely strained aluminum processed by equal-channel angular pressing

Record type: Article

Aluminum of commercial purity was processed by equal-channel angular pressing (ECAP) through two, four and eight passes at room temperature. A series of [1 1 4] convergent-beam electron diffraction (CBED) zone axis patterns were obtained using an electron probe with a diameter of 20 nm. Observations were recorded both immediately adjacent to the grain boundaries and in the grain interiors. Symmetry breaking of the higher-order Laue zone (HOLZ) lines was observed adjacent to the boundaries after two and four passes but not in the grain interiors. Pattern simulation of the CBED patterns taken from the two- and four-pass samples adjacent to the boundaries revealed a homogeneous strain with compressive and shear components. The presence of these homogeneous strains demonstrates that the internal stresses associated with the deformation of aluminum at room temperature are localized in the close vicinity, to within ?20 nm, of the grain boundaries.

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Citation

Alhajeri, Saleh N., Fox, Alan G. and Langdon, Terence G. (2011) A convergent-beam electron diffraction study of strain homogeneity in severely strained aluminum processed by equal-channel angular pressing Acta Materialia, 59, (19), pp. 7388-7395. (doi:10.1016/j.actamat.2011.08.018).

More information

e-pub ahead of print date: 24 September 2011
Published date: November 2011
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 335468
URI: http://eprints.soton.ac.uk/id/eprint/335468
ISSN: 1359-6454
PURE UUID: c1757b1e-7aaf-4b52-8ebb-dea36e95508a
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 14 Mar 2012 14:32
Last modified: 18 Jul 2017 06:10

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Contributors

Author: Saleh N. Alhajeri
Author: Alan G. Fox

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