Abstract
A thermodynamic analysis is developed to determine the chemical composition of the TiAlV β phase for dispersed phase transformation toughening of γ-titanium aluminide. The analysis takes into account the fact that maximum transformation toughening is associated with an optimum level of thermodynamic stability of the β phase with respect to martensitic transformation and with a large positive value of teh β phase → martensite transformation volume change. In addition, to prevent deleteriouss interfacial reactions, the two phases β and γ are required to be in chemical equilibrium. Available thermodynamic and lattice parameter data are used to determine a range of chemical compositions of the β phase which ensures maximum transformation toughening. It is found that this range is sufficiently close to the β−( β+ γ) phase boundary and hence guarantees chemical compatibility between the two phases.
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