Phase Equilibria in the Quaternary System Ti‐Al‐C‐N

The quaternary system Ti‐Al‐C‐N and its binary and ternary boundary systems are investigated using powder methods and XRD analysis. Phase equilibria at 1375°C are presented in an isothermal network for alloys up to 50 at.% Ti. In the vertical section Ti 2 AIC 1‐x ‐Ti 2 AlN 1‐x a complete series of solid solutions exists at 1495°C, but a wide miscibility gap occurs at 1375°C. The vertical section Ti 3 AlC 1‐x ‐Ti 3 AlN 1‐x is more complex because of the occurrence of the quaternary, tetragonally distorted phase Ti 3 Al(C,N) 1‐x ( a = 0.41135(4) nm, c = 0.41366(5) nm) and the transformation of perovskite‐type Ti 3 AlN 1‐x into filled Re 3 B‐type Ti 3 AlN 1‐x below 1200°C.

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