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An Electron Microscope Study of Diffusion Assisted Dislocation Processes in Intermetallic Gamma TiAl

Published online by Cambridge University Press:  10 February 2011

F. Appel ,
U. Lorenz  and
M. Oehring
F. Appel
Affiliation:
Institute for Materials Research, GKSS-Research Centre, Max-Planck-Strasse, D-21502 Geesthacht, Germany
U. Lorenz
Affiliation:
Institute for Materials Research, GKSS-Research Centre, Max-Planck-Strasse, D-21502 Geesthacht, Germany
M. Oehring
Affiliation:
Institute for Materials Research, GKSS-Research Centre, Max-Planck-Strasse, D-21502 Geesthacht, Germany
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Abstract

The paper reports an electron microscope study of diffusion controlled deformation mechanisms in two-phase titanium aluminides which apparently cause the degradation of the strength properties at elevated temperatures. Climb velocities were analyzed in terms the critical vacancy supersaturation necessary for the operation of diffusion assisted dislocation sources. Particular emphasis was paid on structural changes occurring during long-term creep, which are apparently associated with dislocation climb.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 589 , 1999 , 105
Copyright
Copyright © Materials Research Society 2001

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References

1Kad, B.K. and Fraser, H.L., Philos. Mag. A 69 (1994) 689.Google Scholar
2Viguier, B., Bonneville, J. and Martin, J.L., Acta Mater. 44 (1996) 4403.Google Scholar
3Appel, F. and Wagner, R., in: Kim, Y.-W., Wagner, R. and Yamaguchi, M. (Eds.), Gamma Titanium Aluminides, TMS, Warrendale, 1995, p. 231.Google Scholar
4Appel, F., Lorenz, U., Oehring, M., Sparka, U., and Wagner, R., Mater. Sci. Eng. A233 (1997) 1.Google Scholar
5Balluffi, R.W. and Granato, A.V., in: Nabarro, F.R.N. (Ed.), Dislocations in Solids, Vol. 4, North-Holland Publishing Company, Amsterdam, 1979, p. 1.Google Scholar
6Oehring, M., Appel, F., Ennis, P.J., and Wagner, R., Intermetallics 7 (1999) 335.Google Scholar
7Hemker, K.J., Viguier, B. and Mills, M.J., Mater. Sci. Eng. A 164 (1993) 391.Google Scholar
8Appel, F. and Wagner, R., Mater. Sci. Eng. R22 (1998) 187.Google Scholar
9Shirai, Y., Yamaguchi, M., Mater. Sci. Eng. A, 164 (1993) 391.Google Scholar
10Merwe, J. van der and Shiflet, G.J., Acta Metall. Mater. 42 (1994) 1173.Google Scholar
11Cahn, R.W., Takeyama, M., Horton, J.A., Liu, C.T., J. Mat. Res. 6 (1991) 57.Google Scholar