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Micromechanical Deformation of Single-Crystal Alumina Surfaces

Published online by Cambridge University Press:  15 February 2011

Andrey V. Zagrebelny ,
John C. Nelson  and
C. Barry Carter
Andrey V. Zagrebelny
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE., Minneapolis, MN 55455
John C. Nelson
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE., Minneapolis, MN 55455
C. Barry Carter
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE., Minneapolis, MN 55455
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Abstract

In the present study, the micromechanical properties of single-crystal A12O3 have been tested using a micromechanical depth-sensing testing device. A series of microscratches are produced on the annealed {0001}, {1120} sapphire specimens of special geometry. The scratches were positioned in pre-selected crystallographic directions, determined with the backreflection Laue method X-ray diffraction method.

The microscratch tracks were examined with transmission electron microscopy (TEM). The main emphasis in the analysis of deformation structure of sapphire has been placed on the correlation of irregularities observed on load-displacement curves to the extent of elastically deformed regions, nucleation of the dislocations on the surface, unique nature of the crack-dislocation networks associated the sapphire anisotropic deformation behavior.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 440: Symposia CA – Structure and Evolution of Surfaces , 1996 , 189
Copyright
Copyright © Materials Research Society 1997

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