Numéro
J. Phys. IV France
Volume 03, Numéro C7, Novembre 1993
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
Page(s) C7-1053 - C7-1056
DOI http://dx.doi.org/10.1051/jp4:19937163
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés

J. Phys. IV France 03 (1993) C7-1053-C7-1056

DOI: 10.1051/jp4:19937163

Influence of heat treatment on the microstructure and properties of laser welds in 8090

I.R. WHITAKER1, N.J. CALDER2, D.G. McCARTNEY1 and W.M. STEEN3

1  Department of Materials Engineering and Materials Design, University of Nottingham, U.K.
2  Manufacturing Technology, Military Aircraft Division, British Aerospace Defence Ltd., Warton, Lancashire, U.K.
3  Department of Mechanical Engineering, University of Liverpool, U.K.


Abstract
An investigation into the weldability of the Al-Li-Cu-Mg-Zr alloy 8090 using a CO2 laser indicates that the grain structure and microstructure of the weld zone are sensitive to the post-weld heat treatment. If a slow heating rate of 1Kmin-1 to the solution treatment temperature is used the formation of β' dispersoids is promoted which leads to a uniformly small grain size within the fusion zone. If, however, faster heating rates are employed massive grains can form in the fusion zone. This is shown to be associated with a virtual absence of ß' precipitates.



© EDP Sciences 1993