Journal article
Raman microspectroscopy of nanocrystalline and amorphous phases in hardness indentations
Journal of Raman spectroscopy, v 30(10), pp 939-946
Oct 1999
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Abstract
During hardness indentation, materials are subjected to highly l highly localized stresses. These stresses not only cause crack formation and plastic deformation by dislocation gliding, but a complete change of the crystal structure and formation of amorphous phases or high‐pressure polymorphs can occur in the zone of maximum contact stresses. Such contact‐induced phase transformations were observed in hard and brittle materials including semiconductors (Si, Ge, GaAs and InSb) and common ceramic materials such as SiC and SiO2 (α‐quartz and silica glass). A prime tool for their investigation is the Raman microspectroscopy of hardness indentations.
In Si and Ge, there is an initial transformation to metallic high‐pressure phases upon hardness indentation and a subsequent formation of crystalline, nanocrystalline, or amorphous phases depending on the conditions of the hardness test, in particular the unloading rate. A phase transformation occurs also in InSb, whereas the results for GaAs do not give sufficient evidence for phase transformations. Indentation‐induced amorphization has been observed in SiC and quartz. Even diamond has been shown to undergo amorphization and phase transformation under nonhydrostatic stress conditions imposed by indentation tests. Copyright © 1999 John Wiley & Sons, Ltd.
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Details
- Title
- Raman microspectroscopy of nanocrystalline and amorphous phases in hardness indentations
- Creators
- Andreas KailerKlaus G NickelYury G Gogotsi
- Publication Details
- Journal of Raman spectroscopy, v 30(10), pp 939-946
- Publisher
- John Wiley & Sons, Ltd; Chichester, UK
- Number of pages
- 8
- Grant note
- National Science Foundation (DMR‐9874955.) German Research Society (DFG, Ni‐299/5.)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000083469400011
- Scopus ID
- 2-s2.0-0000402404
- Other Identifier
- 991014970029604721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Spectroscopy