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


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, pp. 52-58. (doi:10.1016/j.msea.2009.01.051).

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Description/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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.msea.2009.01.051
ISSNs: 0921-5093 (print)
Related URLs:
Keywords: aluminium, equal channel angular pressing (ecap), strength model, dislocation density, grain size, recovery, hpt, work hardening
Subjects:
Organisations: Engineering Mats & Surface Engineerg Gp
ePrint ID: 64696
Date :
Date Event
2009Published
Date Deposited: 12 Jan 2009
Last Modified: 16 Apr 2017 17:18
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/64696

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