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Precipitation in Al-Cu-Mg-Ag Alloys
A series of alloys with 4 wt% copper and varying magnesium and silver contents was produced in order to study the characteristics of the 0 phase and determine its range of stability with respect to other precipitates that may form on ageing. The presence of 0 was detected by Transmission Electron Microscopy and selected area diffraction techniques in alloys with Cu :Mg ratios of between 15:1 and 1:1 at % although it was only found that 0 was the dominant precipitate in an alloy with a Mg:Ag ratio of 3:1 at ~ 0. Differential Scanning Calorimetry was used to fur ther investigate these alloys and one important result was that, during heating, then phase nucleates at a significantly lower temperature than other phases (8' and S') that form in Al-Cu-Mg alloys. This result (i) suggests that the 0 precipitates are energetically easier to nucleate .