Round Robin into Best Practices for the Determination of Indentation Size Effects.

Ruiz-Moreno A; Hähner P; Kurpaska L; Jagielski J; Spätig P; Trebala M; Hannula SP; Merino S; de Diego G; Namburi H; Libera O; Terentyev D; Khvan T; Heintze C; Jennett N

doi:10.3390/nano10010130

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Round Robin into Best Practices for the Determination of Indentation Size Effects.

Ruiz-Moreno A European Commission, DG-Joint Research Centre, Westerduinweg 3, 1755 LE Petten, The Netherlands.
Hähner P European Commission, DG-Joint Research Centre, Westerduinweg 3, 1755 LE Petten, The Netherlands.
Kurpaska L National Centre for Nuclear Research, A. Sołtana str. 7, 05-400 Otwock-Świerk, Poland.
Jagielski J National Centre for Nuclear Research, A. Sołtana str. 7, 05-400 Otwock-Świerk, Poland.
Spätig P Laboratory for Nuclear Materials, Paul Scherrer Institute, 5232 Villigen, Switzerland.
Trebala M Aalto University, Department of Chemistry and Materials Science, Aalto University, Kemistintie 1, 02150 Espoo, Finland.
Hannula SP Aalto University, Department of Chemistry and Materials Science, Aalto University, Kemistintie 1, 02150 Espoo, Finland.
Merino S Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, (CIEMAT), Avda. Complutense 40, 28040 Madrid, Spain.
de Diego G Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, (CIEMAT), Avda. Complutense 40, 28040 Madrid, Spain.
Namburi H Centrum Vyzkumu Rez, Hlavní 130, 250 68 Husinec-Řež, Czech Republic.
Libera O Centrum Vyzkumu Rez, Hlavní 130, 250 68 Husinec-Řež, Czech Republic.
Terentyev D Institute of Nuclear Materials Science, SCK-CEN, Belgian Nuclear Research Centre, Boeretang 200, Mol, 2400, Belgium.
Khvan T Institute of Nuclear Materials Science, SCK-CEN, Belgian Nuclear Research Centre, Boeretang 200, Mol, 2400, Belgium.
Heintze C Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany.
Jennett N Coventry University, Institute for Future Transport and Cities, Coventry University, Coventry CV1 5FB, UK.

2020-01-16

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Nanomaterials (Basel, Switzerland). - 2020

English The paper presents a statistical study of nanoindentation results obtained in seven European laboratories which have joined a round robin exercise to assess methods for the evaluation of indentation size effects. The study focuses on the characterization of ferritic/martensitic steels T91 and Eurofer97, envisaged as structural materials for nuclear fission and fusion applications, respectively. Depth-controlled single cycle measurements at various final indentation depths, force-controlled single cycle and force-controlled progressive multi-cycle measurements using Berkovich indenters at room temperature have been combined to calculate the indentation hardness and the elastic modulus as a function of depth applying the Oliver and Pharr method. Intra- and inter-laboratory variabilities have been evaluated. Elastic modulus corrections have been applied to the hardness data to compensate for materials related systematic errors, like pile-up behaviour, which is not accounted for by the Oliver and Pharr theory, and other sources of instrumental or methodological bias. The correction modifies the statistical hardness profiles and allows determining more reliable indentation size effects.

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