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Quench sensitivity of toughness in an Al alloy: direct observation and analysis of failure initiation at the precipitate free zone

Record type: Article

Analysis of toughness in 6156 Al-Mg-Si-Cu sheet has been performed using enhanced Kahn tear tests on samples quenched at different rates. Crack initiation energies were hardly affected by changing water quench temperature from 20°C to 60°C; however a significant reduction was evident on air cooling. Crack propagation energy was reduced for both 60°C water quenched and air cooled materials. Observation of failure initiation through synchrotron radiation computed tomography (SRCT), for the 60°C water quenched material revealed failure ahead of the crack tip of grain boundaries oriented at 45° to the main loading axis and crack “tongues” extending into the material ahead of the main crack. Failure was predominantly intergranular. Fractographic assessment revealed predominantly voiding and shear decohesion in the 20°C water quenched material. With the aid of the new findings past models on the influence of precipitate free zone parameters on toughness have been revised

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Citation

Morgeneyer, T.F., Starink, M.J., Wang, S.C. and Sinclair, I. (2008) Quench sensitivity of toughness in an Al alloy: direct observation and analysis of failure initiation at the precipitate free zone Acta Materialia, 56, (12), pp. 2872-2884. (doi:10.1016/j.actamat.2008.02.021).

More information

e-pub ahead of print date: 24 March 2008
Published date: July 2008
Additional Information: Acknowledgements: The authors would like to acknowledge Alcan CRV for financial support and material supply, and Frederic Bron and Bernard Bes for technical discussion. We would also like to thank Jean-Yves Buffière for support in micro-computed tomography.
Keywords: AA6156, quench sensitivity, precipitate free zone, synchrotron radiation computed tomography, intergranular failure, aerospace, toughness, weldable, aluminium, precipitation, fractography, sem, tem
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 50314
URI: http://eprints.soton.ac.uk/id/eprint/50314
ISSN: 1359-6454
PURE UUID: 0d03f413-91f9-4562-a564-969749b63e80

Catalogue record

Date deposited: 14 Feb 2008
Last modified: 17 Jul 2017 14:53

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Contributors

Author: T.F. Morgeneyer
Author: M.J. Starink
Author: S.C. Wang
Author: I. Sinclair

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