Experimental analysis of toughness in 6156 Al-alloy sheet for aerospace application


Morgeneyer, T.F., Starink, M.J. and Sinclair, I. (2006) Experimental analysis of toughness in 6156 Al-alloy sheet for aerospace application. Materials Science Forum, 519-521, 1023-1028.

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Description/Abstract

Analysis of toughness in 6156 Al-Mg-Si-Cu sheet has been performed using enhanced Kahn tear tests on samples quenched at different rates, whilst microstructures of the samples have been assessed using differential scanning calorimetry, scanning electron microscopy and transmission electron microscopy. Crack initiation energies were unaffected by changing water quench temperature from 20°C to 60°C, however a significant reduction was evident on air cooling. Crack propagation resistance was reduced for both 60°C water quenched and air cooled materials. The failure morphology of the air cooled material appears consistent with classical intergranular ductile failure. Coarse voiding and shear decohesion was prevalent in the 20°C water quenched material, whilst the 60°C water quenched material showed a mixture of transgranular and intergranular fracture modes. Changes in microstructure and precipitation behaviour resulting from reduced quenching rate were identified and related to the observed fracture behaviour, particularly in terms of precipitate free zone formation and the simultaneous presence of coarse particles at grain boundaries.

Item Type: Article
Additional Information: Series ISSN 0255-5476
ISBNs: 0878494081 (hardback)
ISSNs: 0255-5476 (print)
Related URLs:
Keywords: AA6156, al-mg-si-cu alloys, toughness, quench sensitivity, precipitate free zone, dsc, kahn tear test, airplane fuselage
Subjects: T Technology > TN Mining engineering. Metallurgy
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 41374
Date Deposited: 29 Aug 2006
Last Modified: 27 Mar 2014 18:26
Contact Email Address: tm504@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/41374

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