Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-25T17:49:48.413Z Has data issue: false hasContentIssue false
  • English
  • Français

TEM In-Situ Study of Dislocation Motion in B2 NiAl Single Crystals

Published online by Cambridge University Press:  15 February 2011

B. Ghosh  and
M. A. Crimp
B. Ghosh
Affiliation:
Department of Materials Science and Mechanics, College of Engineering, Michigan State University, East Lansing, MI 48824–1226.
M. A. Crimp
Affiliation:
Department of Materials Science and Mechanics, College of Engineering, Michigan State University, East Lansing, MI 48824–1226.
Get access

Abstract

In an effort to understand dislocation mobility in stoichiometric NiAl single crystals, in-situ tensile deformation experiments have been performed in a transmission electron microscope. Commercially pure and high purity single crystals with <001> and <110> orientations have been examined. Two different thermal treatments were adopted in order to effect the mechanical response. Dislocation motion was observed in all samples. Pre-existing dislocations, either isolated or tangled, were not observed to move at any point leading up to sample failure. Cross-slip of the mobile dislocations was observed in some cases. In commercially pure single crystals, dislocations were found to move at a much slower rate and uniform manner in contrast to motion in high purity single crystals which occurs by rapid jumps.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 467
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. Miracle, D. B., Acta Metall. Mater., 41, (1993) 649–684.Google Scholar
2. Hack, J. E., Brzeski, J. M. and Darolia, R., Scripta Met. et Mater., 27 (1992), 1259–1263.Google Scholar
3. Darolia, R., Lahrman, D. and Field, R., Scripta Met. et Mater., 26 (1992), 1007–1012.Google Scholar
4. Levit, V. I., Bul, I. A. and Kaufman, M. J., Script Met, et Mater., 34 (1996), 1925–1930.Google Scholar
5. Baker, I., Nagpal, P., Guha, S. and Horton, J.A., Sixth Japanese International Symposium on Intermetallics (1991), (The Japan Institute of Metals, Sendai), 603–607.Google Scholar
6. Nagpal, P., Baker, I. and Horton, J. A., Journal of Intermetallics. 2 (1994), 23–29.Google Scholar
7. Morris, M., Perez, J-F and Darolia, R., Philosophical Magazine A. 69 (1994), 485–506.Google Scholar
8. Ghosh, B. and Crimp, M. A., Deformation and Fracture of Ordered Intermetallics III, Proceedings, editors Soboyejo, W. O., Srivatsan, T. S. and Fraser, S. L. (1996), TMS, 349–359.Google Scholar