Relations between microstructure, precipitation, age-formability and damage tolerance of Al-Cu-Mg-Li (Mn,Zr,Sc) alloys for age forming

Starink, M.J., Gao, N., Kamp, N., Wang, S.C., Pitcher, P.D. and Sinclair, I. (2006) Relations between microstructure, precipitation, age-formability and damage tolerance of Al-Cu-Mg-Li (Mn,Zr,Sc) alloys for age forming. Materials Science and Engineering A, 418, (1-2), 241-249. (doi:10.1016/j.msea.2005.11.023).


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Age forming of Al based alloys for damage tolerant applications requires an alloy with good age formability and good post-forming mechanical properties. To investigate optimisation of this balance, several newly designed Al–Cu–Mg–Li (Mn, Zr, Sc) alloys were subjected to artificial ageing representative of age forming. It was seen that combinations of yield strength and fatigue crack growth resistance could be achieved that are at least comparable to the incumbent damage tolerant material for such applications, whilst creep rates at the ageing temperatures applied were better than those achieved in commercially applied age forming processes of heat treatable Al based alloys. Coarse grain structure and high Li content are associated with good fatigue crack growth resistance but reduce age formability. The underlying physical aspects responsible for the balance between creep rates and resulting properties are discussed. The metallurgical and micromechanical mechanisms analysed and discussed provide a framework for optimisation of composition and forming conditions for age forming of damage tolerant parts.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.msea.2005.11.023
Additional Information: Acknowledgements: The authors would like to acknowledge the financial support from EPSRC, QinetiQ and Airbus UK.
ISSNs: 0921-5093 (print)
Related URLs:
Keywords: age forming, 2xxx alloys, fatigue resistance, grain size, toughness, airframe, aeroplane, wing skin, precipitation, creep forming
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
T Technology > TN Mining engineering. Metallurgy
Divisions : University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 23720
Accepted Date and Publication Date:
Date Deposited: 14 Mar 2006
Last Modified: 31 Mar 2016 11:44

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