Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-1053-C7-1056
Influence of heat treatment on the microstructure and properties of laser welds in 8090I.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.
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