Dislocation dynamics studied by mechanical loss in a Ni{sub 3}(Al,Ta) single crystal at intermediate temperatures
Conference
·
OSTI ID:20001617
Dislocation dynamics in Ni{sub 3}Al intermetallic single crystals has been studied by mechanical spectroscopy between 300 and 700 K. It has been found that in the anomaly domain of the flow stress, which is characteristic of this material, the mechanical loss of predeformed specimens is strongly dependent on strain amplitude, predeformation level, annealing temperature and time. The results can be interpreted as a combination of two phenomena which simultaneously occur as temperature is increased from 300 K to about 500 K: exhaustion of the mobile dislocation segments (superkinks) and pinning of the screw dislocation segments via cross-slip from the (111) onto the (010) planes.
- Research Organization:
- Ecole Polytechnique Federale de Lausanne (CH)
- Sponsoring Organization:
- Fonds National Suisse
- OSTI ID:
- 20001617
- Report Number(s):
- CONF-981104--; ISBN 1-55899-458-0; ISSN 1067-9995
- Country of Publication:
- United States
- Language:
- English
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