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Thermochemical assessments of phase equilibria in the binary and ternary alloy subsystems which describe the addition of Ag to Al–Cu–Mg ternary alloys have been undertaken. The assessed Gibbs free energies show that the ternary intermetallic AlMgAg, silver-rich T-Al(Ag,Cu)Mg and AgMg 3  phases are introduced into Al-rich alloys of the Al–Cu–Mg ternary system for atomic ratios Ag/Mg &lt; 1. For Ag/Mg &gt; 1 the B2 phase AgMg and the Mg-based hcp solid solution become stable. Phase diagrams computed from the assessed Gibbs free energies for Al–Cu– Mg alloys with 0.1 at.% Ag agree with observations of the enhanced stability of the phase T-Al 32 (Ag,Cu,Mg) 49  relative to the h-Al 2 Cu phase compared with the ternary Al–Cu–Mg system, and the enrichment of Ag in the T phase in the Al–Cu–Mg–(Ag) quaternary system compared with its Cu content in the Al–Cu–Mg ternary system. The assessment accepts the Ω precipitation as a growth morphology of h-Al 2 Cu and strongly suggests that the ternary intermetallic AlMgAg rather than AgMg 3  is the precursor on which it nucleates.

An Assessment of Thermodynamic Equilibria in the Ag–Al–Cu–Mg Quaternary System in Relation to Precipitation Reactions