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

Segregation of solute elements at grain boundaries in an ultrafine grained Al–Zn–Mg–Cu alloy
Segregation of solute elements at grain boundaries in an ultrafine grained Al–Zn–Mg–Cu alloy
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
aluminium alloy, atom probe tomography, equal-channel angular pressing, grain boundaries, solute segregation
0304-3991
500-505
Sha, Gang
b4bad9fa-ae61-42b0-97de-b21c8c444519
Yao, Lan
75fa8d08-8892-443e-a0f0-8c9c046ece4c
Liao, Xiaozhou
a3dcfb32-f859-4bc8-a3a8-56c3a0c2a93b
Ringer, Simon P.
e183738b-964a-4891-a1fa-6d86451bf0a5
Duan, Zhi Chao
c52d42f5-73cb-4f51-a240-297b102fd4a7
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Sha, Gang
b4bad9fa-ae61-42b0-97de-b21c8c444519
Yao, Lan
75fa8d08-8892-443e-a0f0-8c9c046ece4c
Liao, Xiaozhou
a3dcfb32-f859-4bc8-a3a8-56c3a0c2a93b
Ringer, Simon P.
e183738b-964a-4891-a1fa-6d86451bf0a5
Duan, Zhi Chao
c52d42f5-73cb-4f51-a240-297b102fd4a7
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

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).

Record type: Article

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

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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

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Date deposited: 12 Mar 2012 11:29
Last modified: 03 Dec 2019 01:51

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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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