Hostname: page-component-848d4c4894-v5vhk Total loading time: 0 Render date: 2024-06-21T14:33:12.507Z Has data issue: false hasContentIssue false
  • English
  • Français

Dislocation Substructure in NiAl Single Crystals Deformed at Ambient Temperature

Published online by Cambridge University Press:  15 February 2011

X. Shi ,
T. M. Pollock ,
S. Mahajan  and
V. S. Arunachalam
X. Shi
Affiliation:
Department of Materials Science & Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
T. M. Pollock
Affiliation:
Department of Materials Science & Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
S. Mahajan
Affiliation:
Department of Materials Science & Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
V. S. Arunachalam
Affiliation:
Department of Materials Science & Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
Get access

Abstract

Dislocation substructure in NiAI single crystals oriented for single slip and deformed at ambient temperature has been studied using weak-beam transmission electron microscopy. Deformation is localized in bands that consists mostly of near-edge dislocations, with an interspersion of a high density of elongated prismatic loops. Pure screw dislocations are not observed, but dislocations having “zigzag” configurations that are near-screw in orientation are present. A high density of jogs is observed on both near-edge and zigzag dislocation segments. The mechanisms for the development of this substructure are discussed, emphasizing the role of double cross slip and resulting glissile and sessile jogs of varying heights.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 493
Copyright
Copyright © Materials Research Society 1997

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. Noebc, R.D., Bowman, R.R., and Natimi, M.V., 1993, Inti. Mils. Reviews, 38, 4.Google Scholar
2. Miracle, D.B., Acta Metall. Mater, 1993, 41, 649.Google Scholar
3. Kitano, K. and Pollock, T.M., Scripta Metall. Mater., 1994, 31, 397.Google Scholar
4. Field, R.D. and Darolia, R., AFOSR Report, F49620–91-C-0077, 1992 Google Scholar
5. Hellmann, J.R. et al., HITEMP Review - 1990: Advanced High Temperature Engine Materials Technology Program, NASA CP-10051, 1990, 41, 1.Google Scholar
6. Taylor, A. and Doyle, N.J., JAppl. Cryst., 1972, 5, 201.Google Scholar
7. Field, R.D., Lahrmann, D.F. and Darolia, R., Mat. Res. Symp Proc, 1991, 213, 255 Google Scholar
8. Loretta, M.H. and Wasilewski, R.J., Phil. Mag., 1971, 23, 1311 Google Scholar
9. Lloyd, C.H. and Loretto, M.H., 1970, Phys. Status Solidi, 39, 163 Google Scholar