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Micromachines 2019, 10(2), 114; https://doi.org/10.3390/mi10020114

The Impact of Hydrogen on Mechanical Properties; A New In Situ Nanoindentation Testing Method

1
Department of Materials Science and Methods, Saarland University, Bldg. D2.2, 66123 Saarbrücken, Germany
2
Mines Saint-Etienne, Univ Lyon, CNRS, UMR 5307LGF, Centre SMS, F-42023 Saint-Etienne France
*
Author to whom correspondence should be addressed.
Received: 13 January 2019 / Revised: 4 February 2019 / Accepted: 6 February 2019 / Published: 11 February 2019
(This article belongs to the Special Issue Small Scale Deformation using Advanced Nanoindentation Techniques)
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Abstract

We have designed a new method for electrochemical hydrogen charging which allows us to charge very thin coarse-grained specimens from the bottom and perform nanomechanical testing on the top. As the average grain diameter is larger than the thickness of the sample, this setup allows us to efficiently evaluate the mechanical properties of multiple single crystals with similar electrochemical conditions. Another important advantage is that the top surface is not affected by corrosion by the electrolyte. The nanoindentation results show that hydrogen reduces the activation energy for homogenous dislocation nucleation by approximately 15–20% in a (001) grain. The elastic modulus also was observed to be reduced by the same amount. The hardness increased by approximately 4%, as determined by load-displacement curves and residual imprint analysis. View Full-Text
Keywords: nickel; nanoindentation; hardness; brittleness and ductility; hydrogen embrittlement nickel; nanoindentation; hardness; brittleness and ductility; hydrogen embrittlement
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Müller, C.; Zamanzade, M.; Motz, C. The Impact of Hydrogen on Mechanical Properties; A New In Situ Nanoindentation Testing Method. Micromachines 2019, 10, 114.

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