Hostname: page-component-77c89778f8-sh8wx Total loading time: 0 Render date: 2024-07-19T19:23:26.012Z Has data issue: false hasContentIssue false
  • English
  • Français

Tem Observations of Dislocation Structures in Single Crystals of NiAl After High Temperature Creep

Published online by Cambridge University Press:  01 January 1992

Uwe Glatzel ,
Keith R. Forbes  and
William D. Nix
Uwe Glatzel
Affiliation:
Inst. Metallforschung, Technische Universität Berlin, 1000 Berlin 12, Germany
Keith R. Forbes
Affiliation:
Dept. Mat. Sci. Eng., Stanford University, Stanford, CA 94305-2205, USA
William D. Nix
Affiliation:
Dept. Mat. Sci. Eng., Stanford University, Stanford, CA 94305-2205, USA
Get access

Abstract

The evolution of dislocation substructures formed in single crystals of NiAl by tension creep testing at temperatures between 1123 K and 1473 K has been studied. Significant differences in the dislocation structure are evident in samples tested in different orientations.

For samples tested in soft orientations, where glide of (001) dislocations is easy, some interacting (001) dislocations can be found. In hard oriented samples, the density of dislocation networks is high and low angle subgrain boundaries are observed. The subgrain size in hard oriented crystals is strongly stress dependent.

In hard oriented crystals, (001) dislocations have no resolved shear stress for glide and must move by the slower process of climb; or by glide of (110) dislocations. The (001) dislocations are captured in networks, leading to a high total dislocation density in hard oriented samples compared to soft oriented crystals, whereas the dislocation density within the volume of subgrains is constant for all orientations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 385
Copyright
Copyright © Materials Research Society 1995

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Ball, A. and Smallman, R. E., Acta Met. Mat. 14, 1349 and 1517 (1966).Google Scholar
2. Field, R. D., Lahrman, D. F. and Darolia, R., Acta Met. Mat. 39, 2951 (1991).Google Scholar
3. Kim, J. T. and Gibala, R. in High Temperature Ordered Intermetallic Alloys IV(Mater. Res. Soc. Proc. 213), 261 (1991).Google Scholar
4. Glatzel, U., Forbes, K. R. and Nix, W. D., Phil. Mag., accepted for publication.Google Scholar
5. Forbes, K. R., Nix, W. D., Glatzel, U. and Darolia, R. in High Temperature Ordered Intermetallic Alloys V (Mat. Res. Soc. Proc. 288), these proceedings.Google Scholar
6. Peissker, E., Haasen, P. and Alexander, H., Phil. Mag. 7, 1279 (1962).Google Scholar