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Stoichiometry effects: on the deformation of binary TiAl alloys

Published online by Cambridge University Press:  31 January 2011

Ernest L. Hall  and
Shyh-Chin Huang
Ernest L. Hall
Affiliation:
GE Corporate Research and Development Center, P.O. Box 8, Schenectady, New York 12301
Shyh-Chin Huang
Affiliation:
GE Corporate Research and Development Center, P.O. Box 8, Schenectady, New York 12301
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Abstract

The room temperature deformation behavior and microstructure of Ti48Al52 and Ti52Al48 alloys are compared. The material was fabricated by rapid solidification melt spinning, and examined in both as-cast and consolidated forms. The Ti52Al48 alloy exhibited enhanced strength and ductility in both forms in bend tests compared with the Ti48Al52 alloy. The microstructure of the Ti52Al48 alloy was two-phase γ–TiAl and α2–Ti3Al. The Ti48Al52 alloy was single-phase γ–TiAl and had a larger grain size than the previous alloy. The microstructure of the Ti52Al48 alloy after room temperature deformation consisted primarily of {111} mechanical twins and a/2〈110〉 perfect dislocations. The comparable Ti48Al52 alloy microstructure contained fewer twins, and many more a〈101〉 and a/2〈112〉 superdislocations were present in addition to a/2〈110〉 dislocations. The superdislocations had dissociated and formed sessile faulted dipoles. The possible reasons for the differences in microstructure and mechanical behavior between these two alloys are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 3 , June 1989 , pp. 595 - 602
Copyright
Copyright © Materials Research Society 1989

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References

1Lipsitt, H. A.High Temperature Ordered Intermetallic Alloys, Materials Research Society Symposia Proceedings, edited by Koch, C. C., Liu, C. T., and Stoloff, N. S. (Materials Research Society, Pittsburgh, PA, 1985), Vol. 39, pp. 351–364.Google Scholar
2McAndrew, J. B. and Kessler, H. D.J. Metals 8 1348 (1956).Google Scholar
3Ence, E. and Margolin, H.Trans. Metall. Soc. AIME 221 151 (1960).Google Scholar
4Shechtman, D.Blackburn, M. J. and Lipsitt, H. A.Metall. Trans. 5 1373 (1974).Google Scholar
5Lipsitt, H. A.Shechtman, D. and Schafrik, R. E.Metall. Trans. A6A, 1991 (1975).Google Scholar
6Hug, G.Loiseau, A. and Lasalmonie, A.Phil. Mag. A54 47 (1986).Google Scholar
7Kawabata, T. and Izumi, O.Scripta Metall. 21 433 (1987).Google Scholar
8Hug, G.Loiseau, A. and Veyssiere, P.Phil. Mag. A57 499 (1988).Google Scholar
9Rowe, R. G. and Amato, R.A.Processing of Structural Materials by Rapid Solidification, edited by Froes, F. H. and Savage, S. J. (ASM, Metals Park, OH, 1987), pp. 251–260.Google Scholar
10Huang, S.C.Hall, E. L. and M.Gigliotti, F. X.High Temperature Ordered Intermetallic Alloys II, Materials Research Society Symposium Proceedings, edited by Stoloff, N.S., Koch, C. C.Liu, C. T. and Izumi, O. (Materials Research Society, Pittsburgh, PA, 1987), Vol. 81, pp. 481–486.Google Scholar
11Pashley, D.W.Robertson, J. L. and Stowell, M.J.Phil. Mag. 19 83 (1969).Google Scholar
12Valencia, J. J.McCullough, C.Levi, C. G. and Mehrabian, R.Scripta Metall. 21 1341 (1987).Google Scholar
13Graves, J.A.Bendersky, L. A.Biancaniello, F. S.Perepezko, J.H. and Boettinger, W. J.Mat. Sci. and Eng. (in press).Google Scholar
14Jones, S.A.Shull, R.D.McAlister, A.J. and Kaufman, M.J.Scripta Metall. 22 1235 (1988).Google Scholar
15Huang, S. C.submitted to Metall. Trans.Google Scholar
16Huang, S. C.Hall, E. L. and M. Gigliotti, F. X.Proc. Sixth World Conference on Titanium, Cannes, France, June 1988 (in press).Google Scholar
17Kawabata, T. and Izumi, O.Phil. Mag. 55 823 (1987).CrossRefGoogle Scholar
18Greenberg, B.A.phys. stat. sol. 42 459 (1970).Google Scholar
19Yoo, M. H.High Temperature Ordered Intermetallic Alloys (Symposium H, Fall 1988), Materials Research Society Symposium Proceedings, edited by Stoloff, N.S.Koch, C. C.Liu, C.T. and Taub, A.I. (Materials Research Society, Pittsburgh, PA) (to be published).Google Scholar
20Huang, S.C. and Hall, E. L. unpublished research.Google Scholar