Abstract
Transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS) were employed to determine the stability and composition of the Ω phase in an Al-Cu-Mg-Ag alloy. It is shown that the Ω. phase can nucleate at isothermal aging temperatures up to 470 °C in the α + θ phase region of the Al-Cu phase diagram. Furthermore, Ω precipitates formed by aging solution-treated and quenched samples at 130 °C were found to exist after reversion treatments at temperatures close to the θ-phase solvus. The TEM/EDS analysis of relief-etched Ω, precip-itates shows that the composition of Ω phase is statistically the same as that of θ-Al2Cu phase in a binary Al-Cu alloy, with Ag and Mg below the limits of detectability. These results indicate that the Ω, phase is probably a metastable {111} variant of the equilibrium θ phase.
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