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An experimental investigation of aluminium-rich aluminium-cobalt-copper alloys has shown that, as in the alloys of alumiinium and copper with nickel and iron respectively, a ternary compound, in addition to the phases Co2 Al9 and CuAl2 , enters into equilibrium with the primary solid solution. Isothermal sections of the ternary model have been established at 530° and 500° C; the field in which the solid solution,α , and the ternary compound,T (CoCu), are in equilibrium is very narrow, while the (α + Co2 Al9 ), (α + Co2 Al9 +T (CoCu)) and (α +T (CoCu)+CuAl2 ) phase fields are relatively extensive. The presence ofT (CoCu), and its formation peritectically from Co2 Al9 , have been confirmed by further experiments on solid and semi-liquid alloys and, from the examination of slowly cooled alloys, the appropriate fields of primary crystallization have been determined. The composition range in whichT (CoCu) separates as primary crystals is restricted, and, for this and other reasons, pure samples ofT (CoCu) cannot be obtained for analysis. Extrapolation of the accurately established (α + T (CoCu) + CuAl2 )/(α + T (CoCu)) and (α + T (CoCu) + CuAl2 )/(T (CoCu) + CuAl2 ) boundaries, however, showrs that the homogeneity range ofT (CoCu) includes the composition Co2 Cu5 Al16 . The solubility of copper in Co2 Al9 does not exceed 1·44% at 570° C. In discussion, it is showm that the ternary compounds NiCu3 Al6 and FeCu2 Al7 occur at the same electron: atom ratio, according to the authors’ theory of the role of transitional elements in alloy formation. The compoundT (CoCu) forms a third member of the same series and is probably of the ideal composition Co2 Cu5 Al13 . The results support the hypothesis of absorption of electrons by transitional metal atoms present in aluminium-rich alloys, and also that the occurrence of ternary compounds is influenced to a marked degree by the electron: atom ratio.

The constitution of the aluminium-rich aluminium-cobaltcopper alloys, with special reference to the role of transitional metals in alloy formation