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Hydrogen diffusion and desorption characteristics of a CoCrFeMnNi high entropy and a CoCrNi medium entropy alloy

  • Future structural components made of the novel high-entropy (HEA) or medium-entropy alloys (MEA) components can be potentially exposed to hydrogen containing environments like high-temperature water in pressurized nuclear reactors or aerospace structures. Further applications are vessels wall materials for cryogenic or high-pressure hydrogen storage. So far, the susceptibility of HEA/MEAs to hydrogen assisted cracking (if any) and the hydrogen diffusion is not investigated in detail yet and can limit or extend possible applications of HEA/MEA as structural materials. In our work, we focused on the hydrogen absorption, diffusion, and distribution in a HEA (Co20Cr20Fe20Mn20Ni20, the original Cantor-alloy) and a MEA (Co33.3Cr33.3Ni33.3). Conventional cathodic hydrogen charging was carried out for the hydrogen ingress in the materials. Thermal desorption analysis (TDA) via carrier gas hot extraction with coupled mass spectrometry revealed complex hydrogen trapping in both alloy types up toFuture structural components made of the novel high-entropy (HEA) or medium-entropy alloys (MEA) components can be potentially exposed to hydrogen containing environments like high-temperature water in pressurized nuclear reactors or aerospace structures. Further applications are vessels wall materials for cryogenic or high-pressure hydrogen storage. So far, the susceptibility of HEA/MEAs to hydrogen assisted cracking (if any) and the hydrogen diffusion is not investigated in detail yet and can limit or extend possible applications of HEA/MEA as structural materials. In our work, we focused on the hydrogen absorption, diffusion, and distribution in a HEA (Co20Cr20Fe20Mn20Ni20, the original Cantor-alloy) and a MEA (Co33.3Cr33.3Ni33.3). Conventional cathodic hydrogen charging was carried out for the hydrogen ingress in the materials. Thermal desorption analysis (TDA) via carrier gas hot extraction with coupled mass spectrometry revealed complex hydrogen trapping in both alloy types up to 300 °C. The absorbed total hydrogen concentrations were ≥ 70 ppm for the HEA and approximately 40 ppm for the MEA-type. Although both materials have different chemical composition, the TDA spectra were comparable. In addition, it was shown that the consideration of the sample geometry is an important influence on the sample temperature. It decreases the effective applied heating rate, which must be anticipated for each hydrogen peak after deconvolution of the spectra. This increases the activation energy and shifts the peak to lower temperatures. As a result, microstructure effects can be separated from experimental boundary conditions like the concentration gradient due to the charging process and later thermal activation.zeige mehrzeige weniger

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Metadaten
Autor*innen:Jonathan Nietzke
Koautor*innen:Michael Rhode, Tim Richter
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2022
Organisationseinheit der BAM:9 Komponentensicherheit
9 Komponentensicherheit / 9.0 Abteilungsleitung und andere
9 Komponentensicherheit / 9.2 Versuchsanlagen und Prüftechnik
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Angewandte Physik
Freie Schlagwörter:Diffusion; High-entropy alloy; Hydrogen; Thermal desorption analysis; Trapping
Themenfelder/Aktivitätsfelder der BAM:Energie
Energie / Wasserstoff
Material
Material / Degradation von Werkstoffen
Material / Materialdesign
Veranstaltung:4th International Conference on Metals and Hydrogen - Steely & Hydrogen 2022
Veranstaltungsort:Ghent, Belgium
Beginndatum der Veranstaltung:11.10.2022
Enddatum der Veranstaltung:13.10.2022
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:17.10.2022
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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