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The indentation size effect of single-crystalline tungsten revisited

Wang, Jin 1; Volz, Tillmann; Weygand, Sabine M.; Schwaiger, Ruth 1
1 Karlsruher Institut für Technologie (KIT)

Abstract:
In this study, we have investigated the indentation size effect (ISE) of single crystalline tungsten with low defect density. As expected, the hardness shows a pronounced increase with decreasing indentation depth as well as a strong strain rate dependence. For penetration depths greater than about 300 nm, the ISE is well captured by the Nix–Gao model in the context of geometrically necessary dislocations. However, clear deviations from the model are observed in the low depth regime resulting in a bilinear effect. The hardness behavior in the low depth regime can be modeled assuming a non-uniform spacing of the geometrically necessary dislocations. We propose that the bilinear indentation size effect observed reflects the evolution of the geometrically necessary dislocation density. With increasing strain rate, the bilinear effect becomes less pronounced. This observation can be rationalized by the activation of different slip systems.


Verlagsausgabe §
DOI: 10.5445/IR/1000133590
Veröffentlicht am 03.06.2021
Originalveröffentlichung
DOI: 10.1557/s43578-021-00221-6
Scopus
Zitationen: 5
Web of Science
Zitationen: 5
Dimensions
Zitationen: 5
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Computational Materials Science (IAM-CMS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0884-2914, 0884-1616, 2044-5326
KITopen-ID: 1000133590
Erschienen in Journal of Materials Research
Verlag Cambridge University Press (CUP)
Nachgewiesen in Dimensions
Scopus
Web of Science
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