Zitieren Sie bitte immer diesen URN: urn:nbn:de:kobv:b43-543631
Hydrogen trapping and embrittlement in high-strength Al alloys
- Ever more stringent regulations on greenhouse gas emissions from transportation motivate efforts to revisit materials used for vehicles. High-strength aluminium alloys often used in aircrafts could help reduce the weight of automobiles, but are susceptible to environmental degradation. Hydrogen ‘embrittlement’ is often indicated as the main culprit; however, the exact mechanisms underpinning failure are not precisely known: atomic-scale analysis of H inside an alloy remains a challenge, and this prevents deploying alloy design strategies to enhance the durability of the materials. Here we performed near-atomic-scale analysis of H trapped in second-phase particles and at grain boundaries in a high-strength 7xxx Al alloy. We used these observations to guide atomistic ab initio calculations, which show that the co-segregation of alloying elements and H favours grain boundary decohesion, and the strong partitioning of H into the second-phase particles removes solute H from the matrix,Ever more stringent regulations on greenhouse gas emissions from transportation motivate efforts to revisit materials used for vehicles. High-strength aluminium alloys often used in aircrafts could help reduce the weight of automobiles, but are susceptible to environmental degradation. Hydrogen ‘embrittlement’ is often indicated as the main culprit; however, the exact mechanisms underpinning failure are not precisely known: atomic-scale analysis of H inside an alloy remains a challenge, and this prevents deploying alloy design strategies to enhance the durability of the materials. Here we performed near-atomic-scale analysis of H trapped in second-phase particles and at grain boundaries in a high-strength 7xxx Al alloy. We used these observations to guide atomistic ab initio calculations, which show that the co-segregation of alloying elements and H favours grain boundary decohesion, and the strong partitioning of H into the second-phase particles removes solute H from the matrix, hence preventing H embrittlement. Our insights further advance the mechanistic understanding of H-assisted embrittlement in Al alloys, emphasizing the role of H traps in minimizing cracking and guiding new alloy design.…
Autor*innen: | H. Zhao, Poulami Chakraborty, D. Ponge, Tilmann HickelORCiD, B. Sun, C.-H. Wu, B. Gault, D. Raabe |
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Dokumenttyp: | Zeitschriftenartikel |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Nature |
Jahr der Erstveröffentlichung: | 2022 |
Organisationseinheit der BAM: | 6 Materialchemie |
6 Materialchemie / 6.4 Materialinformatik | |
Veröffentlichende Institution: | Bundesanstalt für Materialforschung und -prüfung (BAM) |
Verlag: | Nature Publ. Group |
Verlagsort: | London |
Jahrgang/Band: | 602 |
Ausgabe/Heft: | 7897 |
Erste Seite: | 437 |
Letzte Seite: | 441 |
DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Angewandte Physik |
Freie Schlagwörter: | Atomistic models; Hydrogen; Mechanical properties; Metals and alloys |
Themenfelder/Aktivitätsfelder der BAM: | Energie |
Energie / Wasserstoff | |
DOI: | 10.1038/s41586-021-04343-z |
URN: | urn:nbn:de:kobv:b43-543631 |
ISSN: | 1476-4687 |
Verfügbarkeit des Dokuments: | Datei für die Öffentlichkeit verfügbar ("Open Access") |
Datum der Freischaltung: | 17.02.2022 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 21.02.2022 |
Schriftenreihen ohne Nummerierung: | Wissenschaftliche Artikel der BAM |