A study of the ternary phase diagrams of Al–Co with Cu, Ag and Au

Abstract Phase equilibria were studied in the Al–AlAg 3 –AlCo system at 670 and 900 °C, and in the Al–Al 2 Au–AlCo system at 900 and 1000 °C. The 900 °C isothermal section of Al–Cu–Co was specified for Al–AlCo–AlCu. In contrast to Al–Cu–Co, no ternary phases were observed in the systems Al–Ag–Co and Al–Au–Co. The solubility of Ag and Au in M-Al 13 Co 4 reaches ∼1.5 at.%, and in the other Al–Co binary phases it is even lower. The solubility of Co in Al–Ag phases is also low, but up to 12 at.% Co was found to dissolve in Al 2 Au.