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Isothermal Sections of Phase Equilibria in the Al–AlCo–AlNi System

Abstract The phase equilibria of the ternary Al–AlCo–lNi system are demonstrated using isothermal sections at 1170, 1100, 1050, 900, 850, 730, and 600 °C. These are based on metallographic and TEM investigations and on several temperature-concentration sections, which are investigated using thermal analyses. The Scheil reaction scheme is used for explanation of the data. Eleven phases from the binaries Al–Co and Al–Ni and the three ternary phases Y2 (Co2NiAl9), X and D were found at room temperature. The binary high-temperature phase Co4Al13(h) is stabilized in the ternary down to room temperature by Ni addition (Y1). The phase field of D is composed of several modifications which can hardly be distinguished by light microscopy. These modifications are not considered in the present paper. 45 three-phase regions can be derived from the reaction scheme in the Al–AlCo–AlNi subsystem.