Please use this identifier to cite or link to this item: doi:10.22028/D291-32436
Title: Eutectic modification by ternary compound cluster formation in Al-Si alloys
Author(s): Barrirero, Jenifer
Pauly, Christoph
Engstler, Michael
Ghanbaja, Jaafar
Ghafoor, Naureen
Li, Jiehua
Schumacher, Peter
Odén, Magnus
Mücklich, Frank
Language: English
Title: Scientific Reports
Volume: 9
Issue: 1
Publisher/Platform: Springer Nature
Year of Publication: 2020
Free key words: Characterization and analytical techniques
Metals and alloys
DDC notations: 530 Physics
600 Technology
620 Engineering and machine engineering
624 Civil engineering and environmental protection engineering
Publikation type: Journal Article
Abstract: Al-alloys with Si as the main alloying element constitute the vast majority of Al castings used commercially today. The eutectic Si microstructure in these alloys can be modified from plate-like to coral-like by the addition of a small amount of a third element to improve ductility and toughness. In this investigation the effects of Eu and Yb are studied and their influence on the microstructure is compared to further understand this modification. The two elements impact the alloy differently, where Eu modifies Si into a coral-like structure while Yb does not. Atom probe tomography shows that Eu is present within the Si phase in the form of ternary compound Al2Si2Eu clusters, while Yb is absent in the Si phase. This indicates that the presence of ternary compound clusters within Si is a necessary condition for the formation of a coral-like structure. A crystallographic orientation relationship between Si and the Al2Si2Eu phase was found, where the following plane normals are parallel: 011Si//0001Al2Si2Eu, 111Si//67¯10Al2Si2Eu and 011Si//67¯10Al2Si2Eu. No crystallographic relationship was found between Si and Al2Si2Yb. The heterogeneous formation of coherent Al2Si2Eu clusters inside the Si-phase is suggested to trigger the modification of the microstructure.
DOI of the first publication: 10.1038/s41598-019-41919-2
Link to this record: urn:nbn:de:bsz:291--ds-324363
ISSN: 2045-2322
Date of registration: 5-Oct-2020
Description of the related object: Supplementary information
Related object:
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Frank Mücklich
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

Files for this record:
File Description SizeFormat 
s41598-019-41919-2.pdfEutectic modifcation by ternary compound cluster formation in Al-Si alloys4,11 MBAdobe PDFView/Open

This item is licensed under a Creative Commons License Creative Commons