Abstract
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 Ti2AIC1‐x‐Ti2AlN1‐x a complete series of solid solutions exists at 1495°C, but a wide miscibility gap occurs at 1375°C. The vertical section Ti3AlC1‐x‐Ti3AlN1‐x is more complex because of the occurrence of the quaternary, tetragonally distorted phase Ti3Al(C,N)1‐x (a= 0.41135(4) nm, c= 0.41366(5) nm) and the transformation of perovskite‐type Ti3AlN1‐x into filled Re3B‐type Ti3AlN1‐x below 1200°C.
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