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Hardness inhomogeneity and local strengthening mechanisms of an Al1050 aluminium alloy after 1 pass of equal channel angular pressing

Hardness inhomogeneity and local strengthening mechanisms of an Al1050 aluminium alloy after 1 pass of equal channel angular pressing
Hardness inhomogeneity and local strengthening mechanisms of an Al1050 aluminium alloy after 1 pass of equal channel angular pressing
Samples of an Al1050 aluminum alloy (99.5% Al) were subjected to equal channel angular pressing (ECAP) at room temperature for 1 pass. The microhardness is highest at the centre of the cross section of the billet, and the grain size is smallest at the edges, which rules out grain size strengthening as the dominant hardening mechanism. On isochronal ageing at temperatures between 200 and 375 ºC, low angle grain boundaries disappear, the hardness gradually decreases, and hardness differences gradually disappear. A model is described that captures the strengthening mechanisms and model results fit the experimental results well. Analysis of recovery behaviour and strength modelling indicates that the contribution of the dislocations to the strength is higher than that of grain size.
aluminium, equal channel angular pressing (ecap), strength model, dislocation density, grain size, recovery, hpt, work hardening
0921-5093
52-58
Qiao, Xiaoguang
7fa1ecc9-febc-4ee6-9eb1-1d21a0e31741
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Qiao, Xiaoguang
7fa1ecc9-febc-4ee6-9eb1-1d21a0e31741
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21

Qiao, Xiaoguang, Starink, M.J. and Gao, Nong (2009) Hardness inhomogeneity and local strengthening mechanisms of an Al1050 aluminium alloy after 1 pass of equal channel angular pressing. Materials Science and Engineering: A, 513-514, 52-58. (doi:10.1016/j.msea.2009.01.051).

Record type: Article

Abstract

Samples of an Al1050 aluminum alloy (99.5% Al) were subjected to equal channel angular pressing (ECAP) at room temperature for 1 pass. The microhardness is highest at the centre of the cross section of the billet, and the grain size is smallest at the edges, which rules out grain size strengthening as the dominant hardening mechanism. On isochronal ageing at temperatures between 200 and 375 ºC, low angle grain boundaries disappear, the hardness gradually decreases, and hardness differences gradually disappear. A model is described that captures the strengthening mechanisms and model results fit the experimental results well. Analysis of recovery behaviour and strength modelling indicates that the contribution of the dislocations to the strength is higher than that of grain size.

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Published date: 2009
Keywords: aluminium, equal channel angular pressing (ecap), strength model, dislocation density, grain size, recovery, hpt, work hardening
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 64696
URI: https://eprints.soton.ac.uk/id/eprint/64696
ISSN: 0921-5093
PURE UUID: a67e1267-1a6a-40f2-aa5d-bd15f2ba200d

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Date deposited: 12 Jan 2009
Last modified: 13 Mar 2019 20:21

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