Effects of deviation from stoichiometry on deformation behavior of hard-oriented NiAl single crystals
Ni-44Al, Ni-50Al and NiAl-0.3 at.% Hf single crystals have been studied in compression to understand the effects that alloying additions and deviation from stoichiometry can have on the mechanical response of NiAl-based single crystals. While all three single crystals deform through a{lt}111{gt} slip at lower temperatures, the active slip systems differ at higher temperatures. Climb of a{lt}010{gt} dislocations contributes to deformation in Ni-50Al single crystals beyond the slip transition temperature, while Ni-44Al and NiAl-0.3Hf crystals deform through a{lt}101{gt} glide. But several microstructural differences have been observed in the mode of deformation between Ni-44Al and NiAl-0.3Hf crystals. In addition, significant strengthening is exhibited in the Hf-doped crystals at higher temperatures. The post-deformation microstructure is also observed to be sensitive to both strain and strain rate. A possible explanation is offered for some of the observed differences in deformation behavior between the three alloys.
- Research Organization:
- Ohio State Univ., Columbus, OH (US)
- Sponsoring Organization:
- US Department of Energy
- DOE Contract Number:
- FG02-96ER45550
- OSTI ID:
- 20001672
- Report Number(s):
- CONF-981104--; ISBN 1-55899-458-0; ISSN 1067-9995
- Country of Publication:
- United States
- Language:
- English
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