Abstract
For the last five years, the Structures, Materials and Propulsion Laboratory of the Institute for Aerospace Research, National Research Council of Canada, has devoted a significant amount of effort investigating powder metallurgy gamma titanium aluminides. The main results of the studies on microstructural evolution, hot workability, creep behaviour and microstructure-mechanical property relationships for P/M gamma alloys are reviewed in this article. Work is in progress to apply the knowledge gained to cast gamma alloys for gas turbine applications.
Similar content being viewed by others
References
H.A. Lipsitt, Titanium aluminides—An overview, in High-Temperature Ordered Intermetallic Alloy, edited by C.C. Kock, C.T. Liu, and N.S. Stoloff (MRS, Pittsburgh, PA, 1985), Vol. 39, p. 351.
Y.-W. Kim, Gamma titanium aluminides: Their status and future, JOM 47, 39-41 (1995).
J. Beddoes, W. Wallace, and M.C. de Malherbe, The technology of titanium aluminides for aerospace applications, Materials and Manufacturing Processes 7, 527-559 (1992).
W. Wallace, A.K. Koul, J.-P. Immarigeon, P. Au, and J. Beddoes, PM matures as route to aerospace alloys, Metal Powder Report, 32-39 (1994).
Y.-W. Kim and D.M. Dimiduk, Progress in the understanding of gamma titanium aluminides, JOM 43, 40-47 (1991).
J. Beddoes, W. Wallace, and M.C. de Malherbe, Densification of γ-TiAl powder by hot isostatic pressing, The International Journal of Powder Metallurgy 28, 313-325 (1992).
L. Zhao, J. Beddoes, and W. Wallace, The deformation and dynamic recrystallization in a hot isostatically pressed Ti-48Al-2W powder alloy, High-Temperature Ordered Intermetallic Alloys V, edited by I. Baker, R. Darolia, J.D. Whittenberger, and M.H. Yoo (MRS, Pittsburgh, PA, 1993), Vol. 288, p. 921.
W. Wallace, L. Zhao, J. Beddoes, and D. Morphy, Densification and microstructural control of near γ-TiAl intermetallic powders by HIPing, Hot Isostatic Pressing '93, edited by L. Delaey and H. Tas (Elsevier Science B.V., Amsterdam, Netherlands, 1994), p. 99.
L. Zhao, J. Beddoes, D. Morphy, and W. Wallace, Effect of HIP conditions on the microstructure of a near γ-TiAl + W powder alloy, Materials and Manufacturing Processes 9, 695-707 (1994).
J. Beddoes, L. Zhao, and W. Wallace, The microstructural response of near γ-TiAl + W to heat treatment, Scripta Metall. Mater. 28, 383-388 (1993).
Y.-W. Kim, Ordered intermetallic alloys, Part III: Gamma titanium aluminides, JOM 46, 30-40 (1994).
Y.-W. Kim and D.M. Dimiduk, Method to produce gamma titanium alunimide articles having improved properties, U.S. Patent: 5,226,985 (1993).
L. Zhao, P. Au, J. Beddoes, and W. Wallace, Method to produce fine-grained lamellar microstructures in gamma titanium aluminides, U.S. Patent, 5, 653, 828 (1997).
J. Beddoes, L. Zhao, J.-P. Immarigeon, and W. Wallace, The isothermal compression response of a near γ-TiAl + W intermetallic, Mat. Sci. Eng. A183, 211-222 (1994).
J. Beddoes, L. Zhao, and W. Wallace, High temperature compression behaviour of near γ-titanium aluminides containing additions of chromium or tungsten, Mat. Sci. Eng. A184, L11-L15 (1994).
J. Beddoes, L. Zhao, P. Au, and W. Wallace, The brittle-ductile transition in HIP consolidated near γ-TiAl + W and TiAl + Cr powder alloys, Mat. Sci. Eng. A192/193, 324-332 (1995).
J. Beddoes, P. Au, L. van de Mosselaer, L. Zhao, and W. Wallace, The effect of heat treatment on the microstructure of near γ-TiAl powder alloys, Developments and Applications of New Ceramics & Metal Alloys, edited by H. Mostaghaci and R.A.L. Drew (CIM, Quebec City, Quebec, 1993), p. 435.
J. Beddoes, W. Wallace, and L. Zhao, Current understanding of the creep behaviour of near γ-titanium aluminides, Int. Mat. Rev. Vol. 40, 197-218 (1995).
J. Beddoes, L. Zhao, J. Triantafillou, P. Au, and W. Wallace, Effect of composition and lamellar microstructure on creep properties of P/M near γ-TiAl alloys, Gamma Titanium Aluminides, edited by Y.-W. Kim, R. Wagner, and M. Yamaguchi (TMS, Warrendale, PA, 1995), p. 959.
X.J. Wu, J. Beddoes, L. Zhao, and W. Wallace, A kinetics model for creep by intragranular dislocation motion, Mat. Sci. Eng. (1997), submitted.
J. Triantafillou, J. Beddoes, L. Zhao, and W. Wallace, The creep properties of TiAl + W with a lamellar microstructure, Scripta Metall. Mater. 31, 1387-1392 (1994).
L. Zhao, J. Beddoes, D. Morphy, and W. Wallace, Microstructure and mechanical properties of a PM TiAl-W alloy processed by hot isostatic pressing, Mater. Sci. Eng. A192/193, 957-964 (1995).
Author information
Authors and Affiliations
About this article
Cite this article
Zhao, L., Beddoes, J., Au, P. et al. Evaluations of P/M Gamma Titanium Aluminides. Advanced Performance Materials 4, 421–434 (1997). https://doi.org/10.1023/A:1008600712578
Issue Date:
DOI: https://doi.org/10.1023/A:1008600712578