A study of plastic deformation profiles of impressions in diamond
| Autor: | E.J. Brookes, R. D. Daniel, R. M. Erasmus, J. D. Comins |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Materials science
Synthetic diamond Mechanical Engineering Material properties of diamond Diamond General Chemistry Slip (materials science) engineering.material Plasticity Electronic Optical and Magnetic Materials law.invention Stress field law Indentation Materials Chemistry Forensic engineering engineering Electrical and Electronic Engineering Dislocation Composite material |
| Zdroj: | Diamond and Related Materials. 9:1115-1119 |
| ISSN: | 0925-9635 |
| DOI: | 10.1016/s0925-9635(99)00203-4 |
| Popis: | In the last decade it has been shown that, when a diamond is subjected to any configuration of line or point loading (e.g. indentation) at temperatures in the vicinity of 1000°C, dislocation mobility in diamond is considerable [C.A. Brookes, in: J.E. Field (Ed.), The Properties of Natural and Synthetic Diamond, Academic Press, London, 1982, pp. 515–546]. The nature of the stress field associated with indentation using a rigid indenter is complex and very often leads to fracture in the diamond. The development of the indentation technique to permit the introduction of limited levels of strain in ultra-hard covalent materials, by replacing the rigid indenter with a soft impressor, has allowed the controlled plastic deformation of diamond. This takes the form of multiple intersecting slip, without fracture, and can be induced at temperatures less than 0.3Tm. Linking this technique to optical measurement methods, such as cathodoluminescence, photoluminescence and Raman spectroscopy, gives information about the interaction between point defects present in natural and synthetic diamond and the dislocations introduced during the indentation process. This investigation represents the first opportunity to report on a programme of work designed to provide a more satisfactory understanding of the plasticity in diamond on which to evaluate the mechanical properties and the performance of different types of diamond system. |
| Databáze: | OpenAIRE |
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