Chemical composition of the one-phase intermetallic layers and two-phase reaction zones at the interface between a solid iron-nickel alloy containing 90, 75, 50, 25, 20, 15 and 10 mass % Fe, and the aluminium melt, saturated with alloy constituents at 700℃, was studied by electron probe microanalysis. The formation of binary (FeAl{sub}3, Fe{sub}2Al{sub}7, NiAl{sub}3 and NiAl{sub}2) and ternary (FeNiAl{sub}9) intermetallic compounds was observed. All the binaries were found to dissolve considerable amounts of a third element (Ni or Fe) and to have noticeable ranges of homogeneity. Dissolution of the Fe-Ni alloy base into pure liquid aluminium results in three to five times decrease of the total thickness of intermetallic layers, growing between this alloy and aluminium, compared to the case of the saturated aluminium melt.
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