Indentation Size Effect in Electrodeposited Nickel with Different Grain Size and Crystal Orientation

Author:

Haušild Petr1ORCID,Čech Jaroslav1ORCID,Karlík Miroslav1ORCID,Legros Marc2,Nohava Jiří3ORCID,Merle Benoit4

Affiliation:

1. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Trojanova 13, 120 00 Prague, Czech Republic

2. CEMES/CNRS, 29 rue Jeanne Marvig, 31055 Toulouse CEDEX 04, France

3. Anton Paar TriTec, Les Vernets 6, 2035 Corcelles-Cormondrèche, Switzerland

4. Institute of Materials Engineering, University of Kassel, Mönchebergstraße 3, 34125 Kassel, Germany

Abstract

Indentation size effect at shallow indentation depths still remains a challenge as it cannot be correctly described by the Nix–Gao model based on the concept of strain gradient plasticity and geometrically necessary dislocations. The reasons for this discrepancy may be various, and multiple microstructural factors may play a role at the nanoscale. In the present paper, the breakdown of the Nix–Gao model was explored in electrodeposited nickel with different grain size/shape and crystallographic orientation. Crystallographic orientation has no significant effect on the indentation process at shallow depths if plastic deformation has already developed. On the other hand, decreasing the grain size leads to constrained plastic deformation in the grains below the indenter and to an effective plastic zone expansion. Further grain refinement down to the nanograin material leads to a change in the plastic deformation mechanisms to grain boundary-mediated deformation and a more pronounced breakdown of the Nix–Gao model.

Funder

COST (European Cooperation in Science and Technology

European Union

Publisher

MDPI AG

Subject

Inorganic Chemistry,Condensed Matter Physics,General Materials Science,General Chemical Engineering

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