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
Article, Bibliographie
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.
| Item Type: | Article |
|---|---|
| Erschienen: | 2018 |
| Creators: | Javaid, Farhan ; Xu, Y. ; Bruder, Enrico ; Durst, Karsten |
| Type of entry: | Bibliographie |
| Title: | Indentation size effectin tungsten: Quantification of geometrically necessary dislocations underneath the indentations using HR-EBSD |
| Language: | English |
| Date: | August 2018 |
| Publisher: | ELSEVIER SCIENCE INC, USA |
| Journal or Publication Title: | Materials Characterization |
| Issue Number: | 142 |
| DOI: | 10.1016/j.matchar.2018.05.016 |
| 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. |
| Uncontrolled Keywords: | Tungsten, Indentation size effect, Geometrically necessary dislocations, HR-EBSD, ECCI |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy |
| Date Deposited: | 29 May 2018 10:41 |
| Last Modified: | 17 Jul 2018 12:13 |
| PPN: | |
| Funders: | The authors would like to thank Dr. Graham Meaden and Dr. David Dingley from BLG Vantage for Crosscourt software support. |
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