Analysis of strengthening in AA6111 during the early stages of aging: atom probe tomography and yield stress modelling

Marceau, R. K. W., de Vaucorbeil, A, Sha, G, Ringer, S. P. and Poole, W. J. 2013, Analysis of strengthening in AA6111 during the early stages of aging: atom probe tomography and yield stress modelling, Acta Materialia, vol. 61, no. 19, pp. 7285-7303.

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Title Analysis of strengthening in AA6111 during the early stages of aging: atom probe tomography and yield stress modelling
Author(s) Marceau, R. K. W.
de Vaucorbeil, A
Sha, G
Ringer, S. P.
Poole, W. J.
Journal name Acta Materialia
Volume number 61
Issue number 19
Start page 7285
End page 7303
Total pages 19
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2013-11
ISSN 1359-6454
Keyword(s) Al–Mg–Si alloys
yield strength
solute clustering
atom probe tomography
modelling
Summary In this work, a series of aging treatments has been conducted on AA6111 alloy samples for various times at ambient temperature (so-called natural aging) and at temperatures between 60 and 180 °C (artificially aged). The time at artificial ageing was chosen such that samples with approximately the same yield stress were produced. The microstructures of these alloy samples have been carefully characterized using atom probe tomography together with advanced cluster-finding techniques in order to obtain quantitative information about the changes in distribution of both the solute clusters and early-stage precipitates that are formed. The size distribution of clusters has been mapped onto the glide plane and then the stress necessary for a dislocation to pass through the range of obstacles has been estimated using an areal glide model where the dislocation–obstacle interaction strength has been assumed to be related to the obstacle size on the glide plane. It is demonstrated that the contribution of cluster strengthening during artificial aging at higher temperatures is dominated by the high number density of small clusters (Guinier radius <1 nm), whereas the situation during room temperature natural aging is more complex.
Language eng
Field of Research 091207 Metals and Alloy Materials
100712 Nanoscale Characterisation
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2013, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30057300

Document type: Journal Article
Collection: Faculty of Science, Engineering and Built Environment
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Created: Fri, 25 Oct 2013, 18:37:41 EST by Ross Marceau

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