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Dislocations in shock-loaded titanium diboride

Published online by Cambridge University Press:  31 January 2011

D. M. Vanderwalker and
W. J. Croft
D. M. Vanderwalker
Affiliation:
Army Materials Technology Laboratory, Materials Characterization Division, Watertown, Massachusetts 02172
W. J. Croft
Affiliation:
Army Materials Technology Laboratory, Materials Characterization Division, Watertown, Massachusetts 02172
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Abstract

The structure of shock-loaded polycrystalline titanium diboride was examined with transmission electron microscopy. The shock wave from ballistic impact produces prismatic and basal slip in grains favorably oriented with respect to the shock wave. It can be deduced from annealing experiments with the formation of stacking fault hexagons that there is a high concentration of point defects in deformed regions from the motion of dislocation jogs. Weak-beam microscopy shows that the dislocations in TiB2 are dissociated into partial dislocations. The stacking fault energy measured from a screw dislocation in the basal plane was found to be 120 mJ/m2. Widely dissociated dislocations in the shocked sample suggest that residual stresses are present in some regions.

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Articles
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Journal of Materials Research , Volume 3 , Issue 4 , August 1988, pp. 761 - 763
Copyright
Copyright © Materials Research Society 1988

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References

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