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Phase equilibria and phase transformations in molybdenum-containing TiAl alloys

Conference Paper


Abstract


  • Molybdenum, being a strong β stabilizer, is an important alloying element in TiAl alloys, since a significant volume fraction of the disordered bcc β-phase at elevated temperatures improves the processing characteristics during hot-working. Unfortunately, the effect of Mo on the individual phases and their transition temperatures is not completely known but is necessary for designing engineering applications. In this paper, sections of the Ti-Al-Mo ternary phase diagram derived from thermodynamic calculations as well as experimental data are presented. Further, the phase transition temperatures given by the phase diagrams are compared with results from isothermal heat treatment studies, differential scanning calorimetry measurements and in-situ high-temperature diffraction experiments. Combining all of these results, a revised phase diagram is proposed. © 2011 Materials Research Society.

Publication Date


  • 2011

Citation


  • Mayer, S., Sailer, C., Nakashima, H., Schmoelzer, T., Lippmann, T., Staron, P., . . . Takeyama, M. (2011). Phase equilibria and phase transformations in molybdenum-containing TiAl alloys. In Materials Research Society Symposium Proceedings Vol. 1295 (pp. 113-118). doi:10.1557/opl.2011.31

Scopus Eid


  • 2-s2.0-80053208210

Web Of Science Accession Number


Start Page


  • 113

End Page


  • 118

Volume


  • 1295

Abstract


  • Molybdenum, being a strong β stabilizer, is an important alloying element in TiAl alloys, since a significant volume fraction of the disordered bcc β-phase at elevated temperatures improves the processing characteristics during hot-working. Unfortunately, the effect of Mo on the individual phases and their transition temperatures is not completely known but is necessary for designing engineering applications. In this paper, sections of the Ti-Al-Mo ternary phase diagram derived from thermodynamic calculations as well as experimental data are presented. Further, the phase transition temperatures given by the phase diagrams are compared with results from isothermal heat treatment studies, differential scanning calorimetry measurements and in-situ high-temperature diffraction experiments. Combining all of these results, a revised phase diagram is proposed. © 2011 Materials Research Society.

Publication Date


  • 2011

Citation


  • Mayer, S., Sailer, C., Nakashima, H., Schmoelzer, T., Lippmann, T., Staron, P., . . . Takeyama, M. (2011). Phase equilibria and phase transformations in molybdenum-containing TiAl alloys. In Materials Research Society Symposium Proceedings Vol. 1295 (pp. 113-118). doi:10.1557/opl.2011.31

Scopus Eid


  • 2-s2.0-80053208210

Web Of Science Accession Number


Start Page


  • 113

End Page


  • 118

Volume


  • 1295