Phase formation at an interface between aluminum and an iron-nickel alloy

Electron-probe microanalysis has been applied to the compositions of single -phase intermetallide layers and two-phase reaction zones at the interfaces between liquid aluminum saturated with alloy components at 700 degrees C a nd iron-nickel alloys having iron contents of 90, 75, 50, 25, 20, 15, and 1 0 mass %. Binary intermetallides (FeAl3, Fe2Al7, NiAl3, and NiAl2) and a te rnary intermetallide FeNiAl9 are formed. All the binary compounds dissolve considerable amounts of the third element (Ni or Fe) and have appreciable h omogeneity ranges. The dissolution of the Fe - Ni alloy in the pure liquid aluminum reduces the total thicknesses of the intermetallide layers growing between the alloy and the aluminum by a factor 3-5 by comparison with a sa turated aluminum melt.