The Isothermal and Cyclic Oxidation Behavior of a Titanium Aluminide Alloy at Elevated Temperature

  • S.Y. Chang

The isothermal and cyclic oxidation behavior of Ti-47Al-2Mn-2Nb with 0.8 vol.% TiB2 particle-reinforced alloy was investigated in air between 700 and 1000 °C. In the study, the kinetics of isothermal and cyclic oxidation were performed by using a continuous thermogravimetric method which permits mass change measurement under oxidation conditions. The oxide scales and substrates were characterized by scanning electron microscopy with energy-dispersive x-ray analysis and x-ray diffraction. At 700 and 800 °C, the alloy showed an excellent oxidation resistance under isothermal and cyclic conditions. After exposure to air above 800 °C, the outer scale of the alloy was dominated by a fast-growing TiO2 layer. Under the coarse-grained TiO2 layer was the Al2O3-rich scale, which was fine-grained. At 900 and 1000 °C, the extent of oxidation increased clearly. The oxidation rate follows a parabolic law at 700 and 800 °C. However, the alloy, upon isothermal oxidation at 900 °C, can be divided into several stages. During the cyclic oxidation at 900 and 1000 °C, partial scale spallation takes place, leading to a stepwise mass change.


cyclic oxidation isothermal oxidation oxidation kinetics thermogravimetric analysis TiAl-based intermetallic 



Special thanks go to National Science Council (under Grant# NSC94-2216-E-010-CC3) for their sponsorship of this research project.


  1. 1.
    Subramanian P.R., Mendiratta M.G., Dimiduk D.M., Stucke M.A. 1997 Advanced Intermetallic Alloys—Beyond Gamma Titanium Aluminides, Mater. Sci. Eng. A A239-A240:1-13Google Scholar
  2. 2.
    Loria E.A. 2000 Gamma Titanium Aluminides as Prospective Structural Materials, Intermetallics 8:1339-1345CrossRefGoogle Scholar
  3. 3.
    Tetsui T. 1999 Gamma Ti Aluminides for Non-Aerospace Applications, Curr. Opin. Solid State Mater Sci. 4:243-248CrossRefGoogle Scholar
  4. 4.
    Mirshams R.A., Li Z.X., Mohamadian H.P. 1997 High-Temperature Tensile Properties and Fracture Characteristics in a Monolithic Gamma TiAl Alloy and a TiB2 Particle-Reinforced TiAl Alloy, J. Mater. Sci. Lett. 16:715-718CrossRefGoogle Scholar
  5. 5.
    Haanappel V.A.C., Hofman R., Sunderkötter J.D., Glatz W., Clemens H., Stroosnijder M.F. 1998 The Influence of Microstructure on the Isothermal and Cyclic-Oxidation Behavior of Ti-48Al-2Cr at 800 °C, Oxidation Met 48(3-4):263-287CrossRefGoogle Scholar
  6. 6.
    Schumacher G., Detteneanger F., Schütze M., Hornauer U., Richter E., Wieser E., Möller W. 1999 Microalloying Effects in the Oxidation of TiAl Materials, Intermetallics 7:1113-1120CrossRefGoogle Scholar
  7. 7.
    Haanappel V.A.C., Glatz W., Clemens H., Stroosnijder M.F. 1997 The Isothermal and Cyclic Oxidation Behaviour of Ti-48Al-2Cr at 700°C, Mater. High Temperatures 14(1):19-25Google Scholar
  8. 8.
    Becker S., Schütze M., Rahmel A. 1993 Cyclic Oxidation Behaviour of TiAl and of TiAl Alloys, Oxidation Met 39(1/2):93-106CrossRefGoogle Scholar
  9. 9.
    Yoshihara M., Miura K. 1995 Effects of Nb Addition on Oxidation Behavior of TiAl, Intermetallics 3:357-363CrossRefGoogle Scholar
  10. 10.
    Taniguchi S., Uesaki K., Zhu Y.-C., Matsumoto Y., Shibata T. 1999 Influence of Implantation of Al, Si, Cr or Mo Ions on the Oxidation Behaviour of TiAl Under Thermal Cycle Conditions, Mater. Sci. Eng. A A266:267-275Google Scholar
  11. 11.
    Kim B.G., Kim G.M., Kim C.J. 1995 Oxidation Behavior of TiAl-X (X=Cr, V, Si, Mo or Nb) Intermetallics at Elevated Temperature, Scr Metall Mater 33(7):1117-1125CrossRefGoogle Scholar
  12. 12.
    Haanappel V.A.C., Sunderkötter J.D., Stroosnijder M.F. 1999 The Isothermal and Cyclic High Temperature Oxidation Behaviour of Ti-48Al-2Mn-2Nb Compared with Ti-48Al-2Cr-2Nb and Ti-48Al-2Cr, Intermetallics 7:529-541CrossRefGoogle Scholar
  13. 13.
    Wu Y., Hagihara K., Umakoshi Y., 2005 Improvement of Cyclic Oxidation Resistance of Y-containing TiAl-based Alloys with Equiaxial Gamma Microstructures, Intermetallics, 13:879-884CrossRefGoogle Scholar
  14. 14.
    Sunderkötter J.D., Schmutzler H.J., Haanappel V.A.C., Hofman R., Glatz W., Clemens H., Stroosnijder M.F. 1997 The High-Temperature Oxidation Behaviour of Ti-47Al-2Cr-0.2Si and Ti-48Al-2Cr-2Nb Compared with Ti-48Al-2Cr, Intermetallics 5:525-534CrossRefGoogle Scholar
  15. 15.
    Kekare S.A., Aswath P.B. 1997 Oxidation of TiAl Based Intermetallics, J. Mater. Sci. 32:2485-2499CrossRefGoogle Scholar

Copyright information

© ASM International 2007

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringNational Yunlin University of Science & TechnologyTouliuTaiwan

Personalised recommendations