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On the Role of Lamellar Interfaces on the Strength and Ductility of Two-Phase Titanium-Aluminum

Published online by Cambridge University Press:  10 February 2011

Jürg M. K Wiezorek ,
Xiao Dong Dong ,
Michael J. Mills  and
Hamish L Fraser
Jürg M. K Wiezorek
Affiliation:
Department of Materials Science and Engineering, School of Engineering, University of Pittsburgh, 848 Benedum Hall, Pittsburgh, PA 15261, USA.
Xiao Dong Dong
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, 477 Watts Hall, Columbus, OH 43210, USA
Michael J. Mills
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, 477 Watts Hall, Columbus, OH 43210, USA
Hamish L Fraser
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, 477 Watts Hall, Columbus, OH 43210, USA
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Abstract

The deformation mechanisms active in hard orientation compressed pst-TiAl have been studied by transmission electron microscopy (TEM). The observed deformation modes involved soft superdislocation and hard ordinary dislocation slip, and hard twin systems. The transfer of these twin shears occurred across all types of (γ/γ)-interfaces. Transfer mechanisms have been determined on the basis of crystallographic analyses of the TEM data. The active modes of deformation were consistent with macroscopic shape changes observed for the pst-TiAl when the twin shear transfer mechanisms were considered. Based on these observations it has been proposed that the strength and ductility of polycrystalline fully-lamellar TiAl may be improved by reducing the width of both γ- and α2-lamellae.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK3.5.1
Copyright
Copyright © Materials Research Society 1999

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References

REFERENCES

1. Kim, Y.-W., Acta Metall., 1992, 42, 1221 Google Scholar
2. Fujiwara, T, Nakamura, A.. Hosomi, M., Nishitani, S.R., Shirai, Y., and Yamaguchi, M., Phil. Mag. A, 1990, 61, 591.CrossRefGoogle Scholar
3. Hazzledine, P.M., and Kad, B.K., Mat, Mat Sci Eng A, 1995, A192/193, 340.CrossRefGoogle Scholar
4. Kad, B.K., Hazzledine, P.M., and Fraser, H.L., MRS Symp Proc, 1993, 288, 495.CrossRefGoogle Scholar
5. Umakoshi, Y., and Nakano, T., Acta Metall., 1993, 41, 1155.CrossRefGoogle Scholar
6. Wiezorek, J.M.K., Zhang, X.D., Clark, W.A.T., and Fraser, H.L., Phil. Mag. A, 1998, 78, 217.Google Scholar
7. Kishida, K., Inui, H. and Yamaguchi, M., Phil.Mag. A,1998, 78, pp.Google Scholar
8. Liu, C.T., Maziasz, P.J. and Wright, J.L., MRS Symp. Proc., 1997, 460, 83.CrossRefGoogle Scholar