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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), pp. 241-249. (doi:10.1016/j.msea.2005.11.023).

Record type: Article


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.

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Published date: 2006
Additional Information: Acknowledgements: The authors would like to acknowledge the financial support from EPSRC, QinetiQ and Airbus UK.
Keywords: age forming, 2xxx alloys, fatigue resistance, grain size, toughness, airframe, aeroplane, wing skin, precipitation, creep forming
Organisations: Engineering Sciences


Local EPrints ID: 23720
ISSN: 0921-5093
PURE UUID: 8530f50a-ea0f-4dd8-affa-f9a93bd17c63

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Date deposited: 14 Mar 2006
Last modified: 17 Jul 2017 16:16

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Author: M.J. Starink
Author: N. Gao
Author: N. Kamp
Author: S.C. Wang
Author: P.D. Pitcher
Author: I. Sinclair

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