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Segregation of solute elements at grain boundaries in an ultrafine grained Al–Zn–Mg–Cu alloy

Record type: Article

The solute segregation at grain boundaries (GBs) of an ultrafine grained (UFG) Al–Zn–Mg–Cu alloy processed by equal-channel angular pressing (ECAP) at 200 °C was characterised using three-dimensional atom probe. Mg and Cu segregate strongly to the grain boundaries. In contrast, Zn does not always show clear segregation and may even show depletion near the grain boundaries. Trace element Si selectively segregates at some GBs. An increase in the number of ECAP passes leads to a decrease in the grain size but an increase in solute segregation at the boundaries. The significant segregation of alloying elements at the boundaries of ultrafine-grained alloys implies that less solutes will be available in the matrix for precipitation with a decrease in the average grain size

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Citation

Sha, Gang, Yao, Lan, Liao, Xiaozhou, Ringer, Simon P., Duan, Zhi Chao and Langdon, Terence G. (2011) Segregation of solute elements at grain boundaries in an ultrafine grained Al–Zn–Mg–Cu alloy [in special issue: 52nd International Field Emission Symposium] Ultramicroscopy, 111, (6), pp. 500-505. (doi:10.1016/j.ultramic.2010.11.013).

More information

e-pub ahead of print date: 19 November 2010
Published date: May 2011
Keywords: aluminium alloy, atom probe tomography, equal-channel angular pressing, grain boundaries, solute segregation
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 335074
URI: http://eprints.soton.ac.uk/id/eprint/335074
ISSN: 0304-3991
PURE UUID: 82e18935-05d4-44bb-8ee4-c3f22971b6b5
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 12 Mar 2012 11:29
Last modified: 18 Jul 2017 06:11

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Contributors

Author: Gang Sha
Author: Lan Yao
Author: Xiaozhou Liao
Author: Simon P. Ringer
Author: Zhi Chao Duan

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