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Tem Study of Dislocations in Plastically Deformed AlN

Published online by Cambridge University Press:  25 February 2011

V. Audurier ,
J. L. Demenet  and
J. Rabier
V. Audurier
Affiliation:
Laboratoire de Métallurgie Physique, U.R.A. 131 CNRS Faculté des Sciences 86022 Poitiers Cedex, France
J. L. Demenet
Affiliation:
Laboratoire de Métallurgie Physique, U.R.A. 131 CNRS Faculté des Sciences 86022 Poitiers Cedex, France
J. Rabier
Affiliation:
Laboratoire de Métallurgie Physique, U.R.A. 131 CNRS Faculté des Sciences 86022 Poitiers Cedex, France
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Abstract

AlN ceramics were plastically deformed using uniaxial compression under hydrostatic pressure between room temperature (RT) and 800°C. Deformation microstructures have been studied by Transmission Electron Microscopy (TEM) using the weak beam technique. The deformation substructure at RT is characterized by perfect glide loops with 1/3<1120> Burgers vector in (0001) elongated in the screw direction. When deformation temperature increases, the screw character is associated to cross slip events and dislocation dipolesare found. In the investigated temperature range, slip of dislocations with 1/3<1120> Burgers vector is also evidenced on prismatic planes. Weak beam observations failed to evidence any dislocation splitting. Some of these dislocation properties, similar to those of III-V compound semiconductors, suggest that electronic doping effects could be used to control plastic behaviour of covalent ceramics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 242: Symposium G – Wide Band-Gap Semiconductors , 1992 , 475
Copyright
Copyright © Materials Research Society 1992

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References

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