INFLUENCE OF HEAT-TREATMENT ON THE MICROSTRUCTURE AND PROPERTIES OF LASER WELDS IN 8090

Citation
Ir. Whitaker et al., INFLUENCE OF HEAT-TREATMENT ON THE MICROSTRUCTURE AND PROPERTIES OF LASER WELDS IN 8090, Journal de physique. IV, 3(C7), 1993, pp. 1053-1056
Citations number
7
Categorie Soggetti
Physics
Journal title
ISSN journal
11554339
Volume
3
Issue
C7
Year of publication
1993
Part
2
Pages
1053 - 1056
Database
ISI
SICI code
1155-4339(1993)3:C7<1053:IOHOTM>2.0.ZU;2-W
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 microstructu re of the weld zone are sensitive to the post-weld heat treatment. If a slow heating rate of 1 Kmin(-1) to the solution treatment temperatur e is used the formation of beta' (Al3Zr) dispersoids is promoted which leads to a uniformly small grain size within the fusion zone. If, how ever, faster heating rates are employed massive grains can form in the fusion zone. This is shown to be associated with a virtual absence of beta' precipitates.