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The use of friction-surface processing as a method of corrosion protection of a friction-stir weld in the AL-LI-CU alloy AA2050-T851

Melrose, Ben James (2011)
M.Res. thesis, University of Birmingham.

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Abstract

Friction-surface processing (FSP) was explored as a possible method for mitigating corrosion of a friction-stir weld (FSW) in the Al-Li-Cu alloy AA2050-T851. The microstructure, hardness and corrosion behaviour of the base alloy, the FSW and the FSP regions was examined. The base alloy showed susceptibility to pitting parallel to the rolling direction and some intragranular corrosion, but no susceptibility to intergranular corrosion (IGC) or exfoliation corrosion. The FSW showed evidence of IGC in the nugget region and thermomechanically-affected zone (TMAZ), and exfoliation corrosion in the heat-affected zone (HAZ). Regions of the base alloy that had been treated by FSP also showed some IGC. Treatment of the FSW with FSP showed some indication of a reduction of IGC, and there was no evidence of exfoliation corrosion in the FSP-treated FSW-HAZ, but further work needs to be carried out to confirm this.

Type of Work:M.Res. thesis.
Supervisor(s):Davenport, A. (Alison)
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:Department of Metallurgy and Materials
Subjects:TJ Mechanical engineering and machinery
TN Mining engineering. Metallurgy
TS Manufactures
Institution:University of Birmingham
ID Code:2990
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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