Werner, Thomas und Becker, Maike und Baumann, Juliane und Pickmann, Christoph und Sturz, Laszlo und Kargl, Florian (2021) In situ observation of the impact of hydrogen bubbles in Al-Cu melt on directional dendritic solidification. Journal of Materials Science, 56, Seiten 8225-8242. Springer. doi: 10.1007/s10853-020-05748-3. ISSN 0022-2461.
PDF
- Verlagsversion (veröffentlichte Fassung)
3MB |
Offizielle URL: https://link.springer.com/article/10.1007/s10853-020-05748-3
Kurzfassung
Much research has already been focused on the solid-bubble interaction in the interdendritic space for solidifying materials. However, commonly, bubble nucleation is not limited to the mushy zone but also occurs in the liquid melt. In the present research on an Al-10%wt. Cu alloy, the interaction between these bubbles and the approaching solidification front becomes apparent under in situ X-radiography and allows for new insights into the influence of bubbles on the solidifying microstructure. The observed effects comprise bulging of the solidification front toward the bubble, bending of dendrites in front of the bubble, coronal outgrowths surrounding the bubbles, as well as bubble growth, bubble pushing, and bubble eruption. It is found that for the present Al-Cu alloy, the local variation in the solidification speed can be attributed to the bubbles' insulating properties. The range of this effect was observed to be up to 900mum, depending on the bubble diameter, locally increasing solidification speed by up to 350%. The influences of Marangoni vortices and coronal nucleation of misoriented dendrites around bubbles on the homogeneity of the microstructure are discussed. A comparison with experiments on model alloys and simulations from various other studies highlights the similarities and differences to this metallic alloy system.
elib-URL des Eintrags: | https://elib.dlr.de/141525/ | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||
Zusätzliche Informationen: | This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licen ses/by/4.0/. | ||||||||||||||
Titel: | In situ observation of the impact of hydrogen bubbles in Al-Cu melt on directional dendritic solidification | ||||||||||||||
Autoren: |
*DLR corresponding author | ||||||||||||||
Datum: | 18 Januar 2021 | ||||||||||||||
Erschienen in: | Journal of Materials Science | ||||||||||||||
Open Access: | Ja | ||||||||||||||
In SCOPUS: | Ja | ||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||
Band: | 56 | ||||||||||||||
DOI: | 10.1007/s10853-020-05748-3 | ||||||||||||||
Seitenbereich: | Seiten 8225-8242 | ||||||||||||||
Verlag: | Springer | ||||||||||||||
Name der Reihe: | Metals & Corrosion | ||||||||||||||
ISSN: | 0022-2461 | ||||||||||||||
Stichwörter: | Al alloys, directional solidification, hydrogen bubbles, porosity, X-radiography, dendrites | ||||||||||||||
DLR - Schwerpunkt: | Raumfahrt | ||||||||||||||
DLR - Forschungsgebiet: | R FR - Forschung unter Weltraumbedingungen | ||||||||||||||
Standort: | Köln-Porz | ||||||||||||||
Institute & Einrichtungen: | Institut für Materialphysik im Weltraum |
Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags