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Diffusion couples and equilibrated alloys were used to construct the isothermal phase diagram of Au-Al-Cu at 500°C. Electron microprobe analyses were performed to determine the phase compositions and phase relationships. Two ternary phases and 10 three-phase equilibriums were determined in this study. Four additional three-phase equilibriums were estimated to meet the criteria for phase relationships. The δ (Au 2 Al) phase exhibited a wide range of solubility, and the lattice parameters were examined by X-ray. The solubility ranges of the binary intermetallic phases were also determined.

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The isothermal phase diagram of Au-Al-Pd at 500°C was constructed using diffusion couples and equilibrated bulk alloys. Electron microprobe analyses were used to determine the phase compositions and phase relationships. Thirteen three-phase equilibria and two ternary phases (T 1 and T 2 ) were identified in this study. Phase T 1 contained 37 at% Au, 26 at% Pd, and 37 at% Al. Phase T 2 contained 44 at% Au, 24 at% Pd, and 32 at% Al. The Au solubility in the Al 3 Pd 2 , AlPd, and AlPd 2 phases were 6, 15, and 34 at%, respectively. The Pd solubility in the AuAl