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
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.