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The role of grain size and selected microstructural parameters in strengthening fully lamellar TiAl alloys

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Abstract

More than 5 years ago, wrought processing was first used to produce fully lamellar (FL) microstructures in TiAl alloys having grain sizes less than ≈400 µm. These alloys exhibit an improvement in overall balance of properties, especially at high temperatures. More recently, such microstructural forms led to exceptional yield strengths (500 to 1000 MPa at low temperatures) while maintaining attractive high-temperature properties. The improvements appeared to be related to an unusually high apparent sensitivity of strength to grain size. Studies reported an apparent value for the slope of the Hall-Petch (HP) plot approaching 5 MPa√m for FL gamma alloys, while that for single-phase or duplex microstructures is near unity. The present investigations examine the slope of the HP plot for FL microstructures, paying particular attention to the lamellar microstructural variables. Results show that the α 2 lamellar thickness and spacing and the γ lamellar thickness can vary over more than two orders of magnitude with typical process methods. These spacings influence the value of k y in the HP (grain size) relationship. Since they often change concomitantly with grain size in processing, they can give rise to a large scatter in the HP plot. The investigations also examine the flow behavior, glide barriers, and slip multiplicity for polysynthetically twinned (PST) crystals (the single-grain analogue of FL material), and then map this behavior into an explanation of the yield behavior of high-strength FL gamma alloys.

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References

  1. Y.-W. Kim: JOM, 1995, vol. 47 (6), pp. 39–41.

    CAS  Google Scholar 

  2. C.M. Austin and T.J. Kelly: in Gamma Titanium Aluminides, Y.-W. Kim, R. Wagner, and M. Yamaguchi, eds., TMS, Warrendale, PA, 1995, pp. 21–32.

    Google Scholar 

  3. D.M. Dimiduk: in Gamma Titanium Aluminides, Y.-W. Kim, R. Wagner, and M. Yamaguchi, eds., TMS, Warrendale, PA, 1995, pp. 3–20.

    Google Scholar 

  4. Y.-W. Kim and D.M. Dimiduk: Proc. JIMIS-7 on High Temperature Deformation and Fracture, Japan Institute for Metals, Sendai, 1993, pp. 373–82.

    Google Scholar 

  5. Y.-W. Kim: Intermetallic Compounds, 3rd Japan Int. SAMPE Symp., Chiba, Dec. 7–9, 1993, M. Yamaguchi and H. Fukutomi, eds., The Japan Chapter of SAMPE, 1993, pp. 1310–17.

  6. Y.-W. Kim and D.M. Dimiduk: U.S. Patent No. 5,226,985, July 13, 1993.

  7. Y.-W. Kim and D.M. Dimiduk: U.S. Patent No. 5,558,729, Sept. 24, 1996.

  8. Y.-W. Kim: Mater. Sci. Eng., 1995, vols. A192–A193, pp. 519–33.

    Google Scholar 

  9. V.K. Vasudevan, S.A. Court, P. Kurath, and H.L. Fraser: Scripta Metall., 1989, vol. 23, pp. 907–12.

    Article  CAS  Google Scholar 

  10. S.-C. Huang and D.S. Shih: in Microstructure/Property Relationships in Titanium Aluminides and Alloys, Y.-W. Kim and R.R. Boyer, eds., TMS, Warrendale, PA, 1991, pp. 105–22.

    Google Scholar 

  11. P.A. McQuay: Master’s Thesis, Wright State University, Dayton, OH, 1992.

    Google Scholar 

  12. C. Koeppe, A. Bartels, J. Seeger, and H. Mecking: Metall. Trans. A, 1993, vol. 24A, pp. 1795–1806.

    CAS  Google Scholar 

  13. Y. Umakoshi and T. Nakano: Acta Metall. Mater., 1993, vol. 41, pp. 1155–61.

    Article  CAS  Google Scholar 

  14. C.T. Liu, P.J. Maziasz, D.R. Clemens, J.H. Schneibel, V.K. Sikka, T.G. Nieh, J. Wright, and L.R. Walker: in Gamma Titanium Aluminides, Y.-W. Kim, R. Wagner, and M. Yamaguchi, eds., TMS, Warrendale, PA, 1995, pp. 679–88.

    Google Scholar 

  15. Y.-W. Kim: in Gamma Titanium Aluminides, Y.-W. Kim, R. Wagner, and M. Yamaguchi, eds., TMS, Warrendale, PA, 1995, pp. 637–54.

    Google Scholar 

  16. Y.-W. Kim: UES Inc. Wright Laboratory, Materials Directorate, private communication, 1995.

  17. B. Kad and R. Asaro: Phil. Mag. A, 75A (1997) pp. 87–104.

    Google Scholar 

  18. P.M. Hazzledine and S.I. Rao: in Layered Materials for Structural Applications, J.J. Lewandowski, C.H. Ward, M.R. Jackson, and W.H. Hunt, eds., MRS, Pittsburgh, PA, 1996, vol. 434, pp. 135–40.

    Google Scholar 

  19. M. Yamaguchi and Y. Umakoshi: Progr. Mater. Sci., 1990, vol. 34, pp. 1–148.

    Article  CAS  Google Scholar 

  20. H. Inui, A. Nakamura, M.H. Oh, and M. Yamaguchi: Acta Metall. Mater., 1992, vol. 40, pp. 3095–3104.

    Article  CAS  Google Scholar 

  21. S.L. Semiatin, V. Seetharaman, D.M. Dimiduk, and K.H.G. Ashbee: Metall. Mater. Trans. A, 1998, vol. 29A, pp. 7–18.

    CAS  Google Scholar 

  22. Y.-W. Kim: Acta Metall. Mater., 1992, vol. 40, pp. 1121–1134.

    Article  CAS  Google Scholar 

  23. P. McQuay, D.M. Dimiduk, H.A. Lipsitt, and S.L. Semiatin: in Titanium ’92 Science and Technology, F.H. Froes and I. Caplan, eds., TMS, Warrendale, PA, 1993, pp. 1041–48.

    Google Scholar 

  24. S.A. Jones and M.J. Kaufman: Acta Metall. Mater., 1993, vol. 41, pp. 387–98.

    Article  CAS  Google Scholar 

  25. P.L. Martin, S.K. Jain, and M.A. Stucke: in Gamma Titanium Aluminides, Y.-W. Kim, R. Wagner, and M. Yamaguchi, eds., TMS, Warrendale, PA, 1995, pp. 727–36.

    Google Scholar 

  26. D.M. Dimiduk, B.D. Worth, Y.-W. Kim, Mat. Sci. Engr. A., 1997, in press.

  27. P.W. Wang, G.B. Viswanathan, and V.K. Vasudevan: Metall. Mater. Trans. A, 1992, vol. 23A, pp. 690–97.

    CAS  Google Scholar 

  28. A. Denquin and S. Naka: Acta Metall. Mater., 1996, vol. 44, pp. 343–52.

    CAS  Google Scholar 

  29. A. Denquin and S. Naka: Acta Metall. Mater., 1996, vol. 44, pp. 353–65.

    CAS  Google Scholar 

  30. T.A. Parathsarathy, M.G. Mendiratta, and D.M. Dimiduk: 1997, unpublished research.

  31. S. Seshagiri: in Contributive Research and Development, Volume 26, Deformation Behavior and Dislocation Mechanisms in TiAl Alloys, Report, SYSTRAN, Inc., Dayton, OH, Contract No. F33615-94-C-5804, Materials Directorate, Wright Laboratory, Wright-Patterson AFB, OH, 1996, pp. 11–15.

    Google Scholar 

  32. H. Inui, Y. Toda, Y. Shirai, and M. Yamaguchi: Phil. Mag. A, 1994, vol. 69, pp. 1161–77.

    CAS  Google Scholar 

  33. J.D. Eshelby: Phys. Status Solidi, 1963, vol. 3, pp. 2057–60.

    Google Scholar 

  34. J.C.M. Li and G.C.T. Liu: Phil. Mag., 1967, vol. 15, pp. 1059–63.

    CAS  Google Scholar 

  35. J.C.M. Li and Y.T. Chou: Metall. Trans., 1970, vol. 1, pp. 1145–59.

    Google Scholar 

  36. M. Yamaguchi, H. Inui, K. Kishida, M. Matśumoro, and Y. Shirai: in High Temperature Ordered Intermetallic Alloys VI, J.A. Horton, I. Baker, S. Hanada, R.D. Noebe, and D.S. Schwartz, eds., MRS, Pittsburgh, PA, 1995, vol. 364, pp. 3–16.

    Google Scholar 

  37. Y.Q. Sun: Phil. Mag. A, 1997, in press.

  38. S.I. Rao, C. Woodward, J.P. Simmons, and D.M. Dimiduk: in High Temperature Ordered Intermetallic Alloys VI, J.A. Horton, I. Baker, S. Hanada, R.D. Noebe, and D.S. Schwartz, eds., MRS, Pittsburgh, PA, 1995, vol. 364, pp. 129–36.

    Google Scholar 

  39. J.P. Simmons, S.I. Rao, and D.M. Dimiduk: Phil. Mag. A, 75A, pp. 1299–1328.

  40. M.A. Grinfeld, P.M. Hazzledine, B. Shoykhet, and D.M. Dimiduk: Metall. Mater. Trans. A, in press.

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Authors and Affiliations

  1. the Materials Directorate, Wright Laboratory, Wright-Patterson AFB, 45434-7817, OH

    Dennis M. Dimiduk (Research Leader for Structural Materials)

  2. UES Inc., 45432, Dayton, OH

    Peter M. Hazzledine (Principal Scientist), Triplicane A. Parthasarathy (Senior Scientist) & Madan G. Mendiratta (Director of Materials Sciences Division)

  3. Systran, Inc., 45432, Dayton, OH

    Sriram Seshagiri (Visiting Scientist)

Authors
  1. Dennis M. Dimiduk
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  2. Peter M. Hazzledine
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  3. Triplicane A. Parthasarathy
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  4. Madan G. Mendiratta
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  5. Sriram Seshagiri
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Additional information

This article is based on a presentation made in the symposium “Fundamentals of Gamma Titanium Aluminides,” presented at the TMS Annual Meeting, February 10–12, 1997, Orlando, Florida, under the auspices of the ASM/MSD Flow & Fracture and Phase Transformations Committees.

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Dimiduk, D.M., Hazzledine, P.M., Parthasarathy, T.A. et al. The role of grain size and selected microstructural parameters in strengthening fully lamellar TiAl alloys. Metall Mater Trans A 29, 37–47 (1998). https://doi.org/10.1007/s11661-998-0157-3

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  • DOI: https://doi.org/10.1007/s11661-998-0157-3

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