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An atom probe characterization of grain boundaries in an aluminium alloy processed by equal-channel angular pressing

An atom probe characterization of grain boundaries in an aluminium alloy processed by equal-channel angular pressing
An atom probe characterization of grain boundaries in an aluminium alloy processed by equal-channel angular pressing
The segregation of solute elements at the grain boundaries of an Al–Zn–Mg–Cu alloy processed by equal-channel angular pressing was characterised using three-dimensional atom probe tomography. The results show that Mg and Cu segregate strongly to the grain boundaries but Zn shows no clear segregation and even becomes depleted near the boundaries. Trace elements such as Zr, Cr, Si and Mn show no clear segregation at the grain boundaries. An increase in the number of passes leads to a decrease in the grain size but there is no clear effect on the levels of solute segregation at the boundaries. The significant segregation of certain major alloying element at the boundaries of ultrafine-grained alloys implies that the less super-saturation solutes in the matrix will be available for precipitation with a decrease in the average grain size
1674-1678
Sha, Gang
b4bad9fa-ae61-42b0-97de-b21c8c444519
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
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, Ringer, Simon P., Duan, Zhi Chao and Langdon, Terence G. (2009) An atom probe characterization of grain boundaries in an aluminium alloy processed by equal-channel angular pressing. International Journal of Materials Research, (12), 1674-1678.

Record type: Article

Abstract

The segregation of solute elements at the grain boundaries of an Al–Zn–Mg–Cu alloy processed by equal-channel angular pressing was characterised using three-dimensional atom probe tomography. The results show that Mg and Cu segregate strongly to the grain boundaries but Zn shows no clear segregation and even becomes depleted near the boundaries. Trace elements such as Zr, Cr, Si and Mn show no clear segregation at the grain boundaries. An increase in the number of passes leads to a decrease in the grain size but there is no clear effect on the levels of solute segregation at the boundaries. The significant segregation of certain major alloying element at the boundaries of ultrafine-grained alloys implies that the less super-saturation solutes in the matrix will be available for precipitation with a decrease in the average grain size

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Published date: 2009
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 72356
URI: https://eprints.soton.ac.uk/id/eprint/72356
PURE UUID: 3fbaa10d-f60e-4e35-9ffc-e81d5b31a6d1
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 10 Feb 2010
Last modified: 06 Jun 2018 12:48

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