Skip to main content Accessibility help

Experimental Studies and Thermodynamic Simulations of Phase Transformations in Ti-(41-45)Al-4Nb-1Mo-0.1B Alloys

  • Helmut Clemens (a1), Barbara Boeck (a1), Wilfried Wallgram (a2), Thomas Schmoelzer (a1), Laura M. Droessler (a1), Gerald A. Zickler (a3), Harald Leitner (a1) (a3) and Andreas Otto (a4)...


TNM alloys are novel γ-TiAl based alloys which exhibit a high concentration of β-stabilizing elements such as Nb and Mo. Due to the high volume fraction of disordered β-phase these alloys can be hot-die forged under near conventional conditions. In this study, solid-state phase transformations and phase transition temperatures in Ti-(41-45)Al-4Nb-1Mo-0.1B (in at%) alloys were analyzed experimentally and compared to thermodynamic calculations. Results from scanning electron microscopy, conventional and high-energy X-ray diffraction as well as differential scanning calorimetry were used for the characterization of the prevailing phases and phase transformations. For the prediction of phase stabilities and phase transition temperatures thermodynamic calculations were conducted. ThermoCalc® was applied using a commercially available TiAl database. Combining all results a stable as well as a metastable phase diagram for Ti-(41-45)Al-4Nb-1Mo-0.1B alloys is proposed.



Hide All
[1] Structural Aluminides for Elevated Temperatures, edited by Kim, Y-W., Morris, D., Yang, R., and Leyens, C. (TMS, Warrendale PA, 2008).
[2] Clemens, H., Chladil, H.F., Wallgram, W., Böck, B., Kremmer, S., Otto, A., Güther, V., Bartels, A., in [1], p. 217.
[3] Clemens, H., Wallgram, W., Kremmer, S., Güther, V., Otto, A., Bartels, A., Adv. Eng. Mater. 10, 707 (2008).
[4] Clemens, H., Chladil, H.F., Wallgram, W., Zickler, G.A., Gerling, R., Liss, K.-D., Kremmer, S., Güther, V., Smarsly, W., Intermetallics 16, 827 (2008).
[5] Küstner, V., Oehring, M., Chatterjee, A., Güther, V., Clemens, H., Appel, F., in Gamma Titanium Aluminides 2003, edited by Kim, Y-W., Clemens, H. and Rosenberger, A. H. (Warrendale, PA: TMS, 2003), p. 89.
[6] Appel, F., Oehring, M., Wagner, R., Intermetallics 8, 1283 (2000).
[7] Droessler, L.M., Schmoelzer, T., Wallgram, W., Cha, L., Das, G., Clemens, H., these proceedings.
[8] Boeck, B., Diploma thesis, Montanuniversität, Leoben, Austria (2008).
[9] Reimers, W., Pyzalla, A.R., Schreyer, A., Clemens, H. (Eds.), Neutrons and Synchrotron Radiation in Engineering Materials Science (WILEY-VCH, Weinheim, Germany, 2008).
[10] Saunders, N., in Gamma Titanium Aluminides 1999, edited by Kim, Y-W., Dimiduk, D.M. and Loretto, M.H. (TMS, Warrendale PA, 1999), p. 183.
[11] Ansara, I., Int. Met. Reviews 22, 20 (1979).
[12] Saunders, N., Miodownik, A.P., CALPHAD - A Comprehensive Guide (Elsevier Science, New York, 1998).
[13] Chladil, H.F., Clemens, H., Zickler, G.A., Takeyama, M., Kozeschnik, E., Bartels, A., Bulaps, T., Gerling, R., Kremmer, S., Yeoh, L., Liss, K.-D., Int. J. Mat. Res. 98, 1131 (2007).
[14] Wallgram, W., Clemens, H., Böck, B., Schmoelzer, T., Zickler, G.A., Otto, A., Intermetallics (in preparation).


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed