Hostname: page-component-7bb8b95d7b-lvwk9 Total loading time: 0 Render date: 2024-09-23T17:20:08.592Z Has data issue: false hasContentIssue false

Electron Microscopy Study of Fatigue Crack Initiation in Ni3Al Single Crystals

Published online by Cambridge University Press:  26 February 2011

L. M. Hsiung
Affiliation:
Materials Engineering Department Rensselaer Polytechnic Institute Troy, New York 12180-3590
N. S. Stoloff
Affiliation:
Materials Engineering Department Rensselaer Polytechnic Institute Troy, New York 12180-3590
Get access

Abstract

Transmission electron microscopy of single-slip oriented Ni3Al single crystals cyclically deformed at room temperature revealed a high density of dislocation dipoles and point defect clusters. The majority of the defect clusters were identified by weak-beam TEM to be of vacancy type. The observations of circular perfect dislocation loops, Frank loops, and spherical voids revealed the evidence of vacancy condensation during fatigue cycling at room temperature. Together with SEM observations of surface topography, it is suggested that fatigue crack initiation in Ni3Al single crystals can be rationalized by formation of microvoids at PSB/matrix interfaces.

Type
Research Article
Copyright
Copyright © Materials Research Society 1989

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. Hsiung, L. M. and Stoloff, N. S., ICSMA 8, Tampere, Finland, p. 683, (1988), 1, Oxford, (ed. P.O. Kettunen, et al.) Pergamon.Google Scholar
2. Paidar, V., Pope, D. P. and Vitek, V., Acta Metall., 32, p. 435, (1984).CrossRefGoogle Scholar
3. Polak, J., Mat. Sci. and Eng., 92, p. 71, (1987).CrossRefGoogle Scholar
4. Hsiung, L. M. and Stoloff, N. S., to be published.Google Scholar