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Erschienen in: Journal of Materials Science 17/2014

01.09.2014

Impurity effects on the nucleation and growth of primary Al3(Sc,Zr) phase in Al alloys

verfasst von: J. H. Li, B. Oberdorfer, S. Wurster, P. Schumacher

Erschienen in: Journal of Materials Science | Ausgabe 17/2014

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Abstract

Impurity effects on the nucleation and growth of primary Al3(Sc,Zr) phase have been investigated in high purity Al alloys and commercial purity Al alloys, respectively. In the case of high purity Al alloys, primary Al3(Sc,Zr) phases were found to be pushed to grain boundaries ahead of the solidification front. Such type of primary Al3(Sc,Zr) phase did not contribute to the heterogeneous nucleation, and thereby the grain refinement of Al alloys. In the case of commercial purity Al alloys, the presence of Fe, Si, Cu, Mg, Ti, and other impurities significantly enhanced the heterogeneous nucleation of primary Al3(Sc,Zr) phase. Most primary Al3(Sc,Zr) phases were found to be located within the α-Al matrix, and kept an identical orientation relationship with the α-Al matrix. Furthermore, the presence of the impurities also changed the growth mode on the primary Al3(Sc,Zr) phase. In the case of commercial purity Al alloys, a peritectic to eutectic reaction was induced due to the presence of the impurities. A layered growth was observed leading to a narrow particle size distribution. In contrast, in the case of high purity Al alloys, a featureless structure was observed. This investigation demonstrates that impurities and their concentrations are important factors affecting the nucleation and growth of primary Al3(Sc,Zr) phases, and thereby for the successful grain refinement in Al-based alloys.

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Metadaten
Titel
Impurity effects on the nucleation and growth of primary Al3(Sc,Zr) phase in Al alloys
verfasst von
J. H. Li
B. Oberdorfer
S. Wurster
P. Schumacher
Publikationsdatum
01.09.2014
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 17/2014
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-014-8315-z

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