Nitridation of Ti-Al alloys: A thermodynamic approach

A thermodynamic model is used to examine the nitridation of Ti-Al alloys. Once the thermodynamically calculated phase and stability diagrams are established, all the complex ternary interactions are much simpler and more accurately understood compared to a treatment using a collection of single chemical reaction equations. This is because the inter-relation of all possible chemical reactions and the solubilities have been taken care of in the process of thermodynamic modeling and phase diagram calculation. Suitable conditions for local equilibria can be easily identified in a wide temperature, composition and activity range using the thermodynamic modeling of stable and metastable equilibria.