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Microstructural analysis of aluminium alloy 2096 as a function of heat treatment.

Williams, Andrew (2010)
M.Res. thesis, University of Birmingham.

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Abstract

A detailed microstructural investigation into possible metallurgical culprits of stress corrosion cracking (SCC) of Al-Li-Cu alloy AA2096 was carried out as a function of isothermal aging time at 160°C. Two tempers were analysed for this study: under-aged at 4 hours (UA4) and under-aged at 12 hours (UA12). Transmission electron microscopy (TEM) was used to document T1 (Al2CuLi) precipitation near to and on low and high angle misorientation grain boundaries. The low-angle grain boundaries of the UA4 temper exhibited a fine, near continuous decoration of T1 precipitates and a narrow, but distinct T1 precipitate free zone (PFZ) adjacent to the boundary. The high angle boundaries of the UA4 temper either showed no grain boundary T1 precipitation, or contained a single, large T1 precipitate that grew along the boundary causing it to pucker. The low-angle boundaries of the UA12 temper exhibited no such PFZ, with no greater T1 precipitation than observed in the grain matrix. An energy dispersive X-ray (EDX) study was conducted to investigate the possible occurrence of copper solute depletion across grain boundaries. In the UA4 temper, the low-angle grain boundaries exhibited a distinct copped depleted zone that corresponded with the PFZ observed.

Type of Work:M.Res. thesis.
Supervisor(s):Jones, Ian P. and Connolly, Brian J.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Metallurgy and Materials
Subjects:TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:1050
This unpublished thesis/dissertation is copyright of the author and/or third parties.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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