“…The coherent R-phase suffers reversion upon retrogression at 250 1C and the solutes precipitate again during reheating in the calorimeter as Z 0 -þZ-phases, intra-crystalline as well as along grain boundaries and at dislocations of deformed samples without PFZ [10]. From this investigation, the precipitation sequences in AW-7020 alloy proposed in the literature [7,8,[11][12][13] can be confirmed:…”