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. (2010) 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).

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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
Digital Object Identifier (DOI): doi:10.1016/j.ultramic.2010.11.013
ISSNs: 0304-3991 (print)
Keywords: aluminium alloy, atom probe tomography, equal-channel angular pressing, grain boundaries, solute segregation
Subjects:
Organisations: Bioengineering Group
ePrint ID: 335074
Date :
Date Event
19 November 2010e-pub ahead of print
May 2011Published
Date Deposited: 12 Mar 2012 11:29
Last Modified: 17 Apr 2017 17:26
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/335074

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