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Slip Transition and Dislocation Structures in Off-Stoichiometric NiAl Single Crystals

Published online by Cambridge University Press:  15 February 2011

R. Srinivasan ,
M. F. Savage ,
M. S. Daw ,
R. D. Noebe  and
M. J. Mills
R. Srinivasan
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210
M. F. Savage
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210
M. S. Daw
Affiliation:
Department of Physics and Astronomy, Clemson University, Clemson, SC 29634–1911
R. D. Noebe
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
M. J. Mills
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210
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Abstract

Compression tests have been performed on hard-oriented Ni-44A1 single crystals for several temperatures and strain levels. There is a slip transition from a<111> type slip to non-a<111> type slip which corresponds with the observation of yield points. Transmission electron microscopy studies provide evidence for decomposition of a<111> dislocations into a<101> and a<010> dislocations near the “knee” of the yield strength curve. The mechanism of this slip transition and the nature of the dislocation processes both below and above the “knee” are described.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 505
Copyright
Copyright © Materials Research Society 1997

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References

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