Predictions of Phase Equilibria

The TCS Ti/TiAl-based Alloys Database (TCTI) can be used to calculate phase equilibria, including phase fractions and compositions, to reliably account for phase transformations with light impurities (O, N, H, etc.) taken into account. Typical examples for titanium alloys are shown with the emphasis on validation against experimental observations in multicomponent commercial alloys.

Ti-6Al-2Sn-4Zr-2Mo-0.1Si Alloy

Calculated beta-approach curve for the Ti-6Al-2Sn-4Zr-2Mo-0.1Si alloy

Figure 1: Calculated beta-approach curve for the Ti-6Al-2Sn-4Zr-2Mo-0.1Si alloy [2007Sem].

Ti-10-2-3 Alloy

Calculated volume percent of alpha phase for the Ti-10-2-3 alloy

Figure 2: Calculated volume percent of alpha phase for the Ti-10-2-3 alloy [1980Due].

Ti-44.25Al-3.83Nb-0.87Mo-0.1B Alloy

Calculated phase fraction vs. temperature for the Ti-44.25Al-3.83Nb-0.87Mo-0.1B alloy

Figure 3: Calculated phase fraction vs. temperature for the Ti-44.25Al-3.83Nb-0.87Mo-0.1B alloy.

References

[1980Due] T. W. Duerig, G. T. Terlinde, J. C. Williams, Phase transformations and tensile properties of Ti-10V-2Fe-3AI. Metall. Trans. A. 11, 1987–1998 (1980).

[2007Sem] S. L. Semiatin, T. M. Lehner, J. D. Miller, R. D. Doherty, D. U. Furrer, Alpha/Beta Heat Treatment of a Titanium Alloy with a Nonuniform Microstructure. Metall. Mater. Trans. A. 38, 910–921 (2007).