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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.

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References

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