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

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 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.

Identifiers

DOI

10.1111/j.1151-2916.1996.tb08979.x

Citations and references