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Effects of Deviation from Stoichiometry on Deformation Behavior of Hard-Oriented NiAl Single Crystals

Published online by Cambridge University Press:  10 February 2011

R. Srinivasan ,
M. F. Savage ,
R. D. Noebe  and
M. J. Mills
R. Srinivasan
Affiliation:
Dept. of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210
M. F. Savage
Affiliation:
Dept. of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210
R. D. Noebe
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
M. J. Mills
Affiliation:
Dept. of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210
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Abstract

Ni-44A1, 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<111> slip at lower temperatures, the active slip systems differ at higher temperatures. Climb of a<010> dislocations contributes to deformation in Ni-50AI single crystals beyond the slip transition temperature, while Ni-44Al and NiAl-0.3Hf crystals deform through a<101> 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK9.10.1
Copyright
Copyright © Materials Research Society 1999

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