Duarte, M. J. ; Fang, X. ; Rao, J. ; Krieger, W. ; Brinckmann, S. ; Dehm, G. (2024)
In situ nanoindentation during electrochemical hydrogen charging: a comparison between front-side and a novel back-side charging approach.
In: Journal of Materials Science, 2021, 56 (14)
doi: 10.26083/tuprints-00023494
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
The effects of hydrogen in metals are a pressing issue causing severe economic losses due to material deterioration by hydrogen embrittlement. A crucial understanding of the interactions of hydrogen with different microstructure features can be reached by nanoindentation due to the small volumes probed. Even more, in situ testing while charging the sample with hydrogen prevents the formation of concentration gradients due to hydrogen desorption. Two custom electrochemical cells for in situ testing were built in-house to charge the sample with hydrogen during nanoindentation: “front-side” charging with the sample and the indenter tip immersed into the electrolyte, and “back-side” charging where the analyzed region is never in contact with the solution. During front-side charging, surface degradation often occurs which also negatively influences analyses after hydrogen charging. The back-side charging approach proposed in this work is a promising technique for studying in situ the effects of hydrogen in alloys under mechanical loads, while completely excluding the influence of the electrolyte on the nanoindented surface. Hydrogen diffusion from the charged back-side toward the testing surface is here demonstrated by Kelvin probe measurements in ferritic FeCr alloys, used as a case study due to the high mobility of hydrogen in the bcc lattice. During nanoindentation, a reduction on the shear stress necessary for dislocations nucleation due to hydrogen was observed using both setups; however, the quantitative data differs and a contradictory behavior was found in hardness measurements. Finally, some guidelines for the use of both approaches and a summary of their advantages and disadvantages are presented.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Duarte, M. J. ; Fang, X. ; Rao, J. ; Krieger, W. ; Brinckmann, S. ; Dehm, G. |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | In situ nanoindentation during electrochemical hydrogen charging: a comparison between front-side and a novel back-side charging approach |
| Sprache: | Englisch |
| Publikationsjahr: | 24 September 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | Mai 2021 |
| Ort der Erstveröffentlichung: | Dordrecht |
| Verlag: | Springer Science |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Materials Science |
| Jahrgang/Volume einer Zeitschrift: | 56 |
| (Heft-)Nummer: | 14 |
| DOI: | 10.26083/tuprints-00023494 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/23494 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | The effects of hydrogen in metals are a pressing issue causing severe economic losses due to material deterioration by hydrogen embrittlement. A crucial understanding of the interactions of hydrogen with different microstructure features can be reached by nanoindentation due to the small volumes probed. Even more, in situ testing while charging the sample with hydrogen prevents the formation of concentration gradients due to hydrogen desorption. Two custom electrochemical cells for in situ testing were built in-house to charge the sample with hydrogen during nanoindentation: “front-side” charging with the sample and the indenter tip immersed into the electrolyte, and “back-side” charging where the analyzed region is never in contact with the solution. During front-side charging, surface degradation often occurs which also negatively influences analyses after hydrogen charging. The back-side charging approach proposed in this work is a promising technique for studying in situ the effects of hydrogen in alloys under mechanical loads, while completely excluding the influence of the electrolyte on the nanoindented surface. Hydrogen diffusion from the charged back-side toward the testing surface is here demonstrated by Kelvin probe measurements in ferritic FeCr alloys, used as a case study due to the high mobility of hydrogen in the bcc lattice. During nanoindentation, a reduction on the shear stress necessary for dislocations nucleation due to hydrogen was observed using both setups; however, the quantitative data differs and a contradictory behavior was found in hardness measurements. Finally, some guidelines for the use of both approaches and a summary of their advantages and disadvantages are presented. |
| Freie Schlagworte: | Materials Science, general, Characterization and Evaluation of Materials, Polymer Sciences, Solid Mechanics, Crystallography and Scattering Methods, Classical Mechanics |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-234945 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik 600 Technik, Medizin, angewandte Wissenschaften > 670 Industrielle und handwerkliche Fertigung |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft |
| Hinterlegungsdatum: | 24 Sep 2024 11:47 |
| Letzte Änderung: | 25 Sep 2024 08:58 |
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| Suche nach Titel in: | TUfind oder in Google |
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- In situ nanoindentation during electrochemical hydrogen charging: a comparison between front-side and a novel back-side charging approach. (deposited 24 Sep 2024 11:47) [Gegenwärtig angezeigt]
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