Microstructural evolution in pure aluminium and a 7034 alloy processed by equal channel angular pressing


Gao, N., Starink, M.J., Xu, C. and Langdon, T.G. (2004) Microstructural evolution in pure aluminium and a 7034 alloy processed by equal channel angular pressing. In, Nie, J.F., Morton, A.J. and Muddle, B.C. (eds.) Proceedings of 9th International Conference on Aluminium Alloys. 9th International Conference on Aluminium Alloys (ICAA9) Melbourne, Australia, Institute of Materials Engineering Australasia, 856-861. (Materials Forum 28).

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Description/Abstract

Experiments were conducted to evaluate the microstructural evolution occurring in pure
aluminium and a spray-cast Al-7034 alloy after processing through equal-channel angular
pressing (ECAP). Electron back-scatter diffraction (EBSD) was used to determine the
grain boundary misorientations and the texture after ECAP and differential scanning
calorimetry (DSC) was employed to evaluate the nature of thermal effects taking place
during heating. The results demonstrate there is an increase in the fraction of boundaries
having high angles of misorientation with increasing strain. For pure aluminium, there is
an S texture {122} <634> after 4 passes and a brass texture {011} <211> after 8 passes.
For the Al-7034 alloy, the textures changes from a fibre <111>x texture in the as-received
condition to a <101>y after 1 pass, <111>y after 4 passes and <100>z after 8 passes. For
the Al-7034 alloy, the DSC analysis identifies the occurrence of several thermal effects
during heating involving the formation, coarsening, dissolution and melting of the η-phase.

Item Type: Book Section
Related URLs:
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 22733
Date Deposited: 09 Mar 2007
Last Modified: 27 Mar 2014 18:12
Publisher: Institute of Materials Engineering Australasia
URI: http://eprints.soton.ac.uk/id/eprint/22733

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