Werner, Thomas and Becker, Maike and Baumann, Juliane and Pickmann, Christoph and Sturz, Laszlo and 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, pp. 8225-8242. Springer. doi: 10.1007/s10853-020-05748-3. ISSN 0022-2461.
PDF
- Published version
3MB |
Official URL: https://link.springer.com/article/10.1007/s10853-020-05748-3
Abstract
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.
Item URL in elib: | https://elib.dlr.de/141525/ | ||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Document Type: | Article | ||||||||||||||||||||||||||||
Additional Information: | 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/. | ||||||||||||||||||||||||||||
Title: | In situ observation of the impact of hydrogen bubbles in Al-Cu melt on directional dendritic solidification | ||||||||||||||||||||||||||||
Authors: |
| ||||||||||||||||||||||||||||
Date: | 18 January 2021 | ||||||||||||||||||||||||||||
Journal or Publication Title: | Journal of Materials Science | ||||||||||||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||||||||||||
Open Access: | Yes | ||||||||||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||||||||||||||
In ISI Web of Science: | Yes | ||||||||||||||||||||||||||||
Volume: | 56 | ||||||||||||||||||||||||||||
DOI: | 10.1007/s10853-020-05748-3 | ||||||||||||||||||||||||||||
Page Range: | pp. 8225-8242 | ||||||||||||||||||||||||||||
Publisher: | Springer | ||||||||||||||||||||||||||||
Series Name: | Metals & Corrosion | ||||||||||||||||||||||||||||
ISSN: | 0022-2461 | ||||||||||||||||||||||||||||
Status: | Published | ||||||||||||||||||||||||||||
Keywords: | Al alloys, directional solidification, hydrogen bubbles, porosity, X-radiography, dendrites | ||||||||||||||||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||||||||||||||||||
HGF - Program: | Space | ||||||||||||||||||||||||||||
HGF - Program Themes: | Research under Space Conditions | ||||||||||||||||||||||||||||
DLR - Research area: | Raumfahrt | ||||||||||||||||||||||||||||
DLR - Program: | R FR - Research under Space Conditions | ||||||||||||||||||||||||||||
DLR - Research theme (Project): | R - Material Design and New Materials, R - Materials Research and Microgravity (MuM) | ||||||||||||||||||||||||||||
Location: | Köln-Porz | ||||||||||||||||||||||||||||
Institutes and Institutions: | Institute of Materials Physics in Space | ||||||||||||||||||||||||||||
Deposited By: | Kargl, Dr Florian | ||||||||||||||||||||||||||||
Deposited On: | 30 Mar 2021 20:55 | ||||||||||||||||||||||||||||
Last Modified: | 28 Mar 2023 23:59 |
Repository Staff Only: item control page