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Nucleation and propagation of cracks at grain boundaries in zinc bicrystals

Published online by Cambridge University Press:  31 January 2011

H. A. Schmitz ,
D. Dew-Hughes  and
J. C. Bilello
H. A. Schmitz
Affiliation:
Department of Materials Science and Engineering, State University of New York at Stony Brook, Stony Brook, New York 11794
D. Dew-Hughes
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ. United Kingdom
J. C. Bilello
Affiliation:
Department of Mechanical Engineering, California State University, Fullerton, California 92634
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Abstract

A study has been made of fatigue and fracture in zinc bicrystals. It is shown that cleavage cracks are nucleated, both under tension and as a result of fatigue, in regions of multiple slip adjacent to grain boundaries at stresses below those for crack nucleation in single crystals. The nature of crack penetration through the boundary is observed as a function of orientation across the boundary. Low angle tilt boundaries are barriers to crack propagation, increasing effective surface energies for crack propagation by 1.6–2 times. Twist boundaries, due to the tearing that accompanies penetration, can result in a twelvefold increase in effective surface energy. Nonbasal cleavage is associated with a twinning mechanism, and an even higher surface energy is required to propagate a crack into a crystal oriented for this type of cleavage. The results carry the implication that, in the absence of surface defects, fatigue, failure in polycrystalline zinc is nucleated at the first internal grain boundary and not at the surface.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 5 , October 1989 , pp. 1182 - 1194
Copyright
Copyright © Materials Research Society 1989

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References

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