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In situ observation of the impact of hydrogen bubbles in Al-Cu melt on directional dendritic solidification

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.

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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
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Titel:In situ observation of the impact of hydrogen bubbles in Al-Cu melt on directional dendritic solidification
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iD
Werner, Thomas*Thomas.Werner (at) dlr.de
Becker, MaikeMaike.Becker (at) dlr.dehttps://orcid.org/0000-0002-6732-5411
Baumann, JulianeJuliane.Baumann (at) dlr.de
Pickmann, ChristophACCESS e. V.
Sturz, LaszloACCESS e.V.
Kargl, FlorianInstitut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, Germany
*DLR corresponding author
Datum:18 Januar 2021
Erschienen in:Journal of Materials Science
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
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
Status:veröffentlicht
Stichwörter:Al alloys, directional solidification, hydrogen bubbles, porosity, X-radiography, dendrites
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Forschung unter Weltraumbedingungen
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):R - Materialdesign und neue Materialien, R - Materialforschung und Mikrogravitation (MuM)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Materialphysik im Weltraum
Hinterlegt von: Kargl, Dr Florian
Hinterlegt am:30 Mär 2021 20:55
Letzte Änderung:28 Mär 2023 23:59

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