The deformation behavior of ceramic crystals subjected to very low load (nano)indentations
- Materials Division, Department of Mechanical, Materials and Manufacturing Engineering, University of Newcastle upon Tyne, Newcastle upon Tyne NE1 7RU (United Kingdom)
- Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37381 (United States)
The ultra-low load indentation response of ceramic single crystal surfaces (Al{sub 2}O{sub 3}, SiC, Si) has been studied with a software-controlled hardness tester (Nanoindenter) operating in the load range 2--60 mN. In all cases, scanning and transmission electron microscopy have been used to characterize the deformation structures associated with these very small-scale hardness impressions. Emphasis has been placed on correlating the deformation behavior observed for particular indentations with irregularities in recorded load-displacement curves. For carefully annealed sapphire, a threshold load (for a given indenter) was observed below which the only surface response was elastic flexure and beyond which dislocation loop nucleation occurred at, or near, the theoretical shear strength to create the indentation.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5002348
- Journal Information:
- Journal of Materials Research; (United States), Vol. 7:2; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM OXIDES
DEFORMATION
HARDNESS
CERAMICS
SILICON
SILICON CARBIDES
DISLOCATIONS
ELECTRON MICROSCOPY
MONOCRYSTALS
NUCLEATION
ALUMINIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
ELEMENTS
LINE DEFECTS
MECHANICAL PROPERTIES
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
SEMIMETALS
SILICON COMPOUNDS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties