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


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), 500-505. (doi:10.1016/j.ultramic.2010.11.013).

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Description/Abstract

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

Item Type: Article
ISSNs: 0304-3991 (print)
Keywords: aluminium alloy, atom probe tomography, equal-channel angular pressing, grain boundaries, solute segregation
Subjects: T Technology > TP Chemical technology
Divisions: Faculty of Engineering and the Environment > Engineering Sciences > Bioengineering Research Group
ePrint ID: 335074
Date Deposited: 12 Mar 2012 11:29
Last Modified: 27 Mar 2014 20:19
URI: http://eprints.soton.ac.uk/id/eprint/335074

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