Javaid, Farhan ; Xu, Y. ; Bruder, Enrico ; Durst, Karsten (2018)
Indentation size effectin tungsten: Quantification of geometrically necessary dislocations underneath the indentations using HR-EBSD.
In: Materials Characterization, (142)
doi: 10.1016/j.matchar.2018.05.016
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
During indentation testing of the low defect density crystalline materials, higher hardness values are found at lower indentation depths, which is referred to as an indentation size effect. The depth-dependence of hardness can be described by the Nix-Gao model, which is based on the concept of Geometrically Necessary Dislocations (GNDs). The underlying dislocation mechanism remains, however, unclear and requires independent measurement of GND density below the indentation. In the present work, the depth-dependency of the GND density is quantified underneath the Berkovich indentations in tungsten via high-resolution electron backscatter diffraction. There a higher GND density is found for lower indentation depths, resulting in a higher Taylor hardness for measured GND density.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2018 |
| Autor(en): | Javaid, Farhan ; Xu, Y. ; Bruder, Enrico ; Durst, Karsten |
| Art des Eintrags: | Bibliographie |
| Titel: | Indentation size effectin tungsten: Quantification of geometrically necessary dislocations underneath the indentations using HR-EBSD |
| Sprache: | Englisch |
| Publikationsjahr: | August 2018 |
| Verlag: | ELSEVIER SCIENCE INC, USA |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Materials Characterization |
| (Heft-)Nummer: | 142 |
| DOI: | 10.1016/j.matchar.2018.05.016 |
| Kurzbeschreibung (Abstract): | During indentation testing of the low defect density crystalline materials, higher hardness values are found at lower indentation depths, which is referred to as an indentation size effect. The depth-dependence of hardness can be described by the Nix-Gao model, which is based on the concept of Geometrically Necessary Dislocations (GNDs). The underlying dislocation mechanism remains, however, unclear and requires independent measurement of GND density below the indentation. In the present work, the depth-dependency of the GND density is quantified underneath the Berkovich indentations in tungsten via high-resolution electron backscatter diffraction. There a higher GND density is found for lower indentation depths, resulting in a higher Taylor hardness for measured GND density. |
| Freie Schlagworte: | Tungsten, Indentation size effect, Geometrically necessary dislocations, HR-EBSD, ECCI |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physikalische Metallkunde |
| Hinterlegungsdatum: | 29 Mai 2018 10:41 |
| Letzte Änderung: | 17 Jul 2018 12:13 |
| PPN: | |
| Sponsoren: | The authors would like to thank Dr. Graham Meaden and Dr. David Dingley from BLG Vantage for Crosscourt software support. |
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