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Effect of boron on the mechanism of strain transfer across grain boundaries in Ni3Al

Published online by Cambridge University Press:  31 January 2011

G. M. Bond ,
I. M. Robertson  and
H. K. Birnbaum
G. M. Bond
Affiliation:
Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801
I. M. Robertson
Affiliation:
Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801
H. K. Birnbaum
Affiliation:
Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801
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Abstract

The effect of boron on the mechanism of strain transfer across grain boundaries in Ni3Al has been investigated by dynamic recording of events occurring during in-situ straining in the transmission electron microscope. Boundaries in both doped and undoped material can act as effective barriers to dislocation motion, large numbers of dislocations being incorporated into the boundary without any plastic strain occurring in the adjacent grain. In the undoped material, the grain-boundary strain is relieved by the sudden failure of the grain boundary. In the doped material the strain is relieved by the sudden generation and emission of large numbers of dislocations from the grain boundary. This effect may be understood by boron either increasing the grain-boundary cohesion or reducing the stress required to operate grain-boundary dislocation sources, rather than easing the passage of slip dislocations through the grain boundary.

Type
Articles
Information
Journal of Materials Research , Volume 2 , Issue 4 , August 1987 , pp. 436 - 440
Copyright
Copyright © Materials Research Society 1987

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References

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