Cluster formation at the Si/liquid interface in Sr and Na modified Al–Si alloys. (May 2016)

• Record Type: Journal Article
• Authors: Barrirero, Jenifer; Li, Jiehua; Engstler, Michael; Ghafoor, Naureen; Schumacher, Peter; Odén, Magnus; Mücklich, Frank
• Is Part Of: Scripta materialia. Volume 117(2016)
• Page Start: 16
• Page End: 19
• Publication Date: 2016-05
• Subjects: Eutectic solidification -- Atom probe tomography -- Aluminium alloys -- Eutectic modification -- Transmission electron microscopy; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.02.018
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Atom probe tomography was used to compare Na and Sr modified Al–Si hypoeutectic alloys. Both Na and Sr promote the formation of nanometre-sized clusters in the Si eutectic phase. Compositional analyses of the clusters show an Al:Sr ratio of 2.92 ± 0.46 and an Al:Na ratio of 1.07 ± 0.23. It is proposed that SrAl2 Si2 and NaAlSi clusters are formed at the Si/liquid interface and take part in the modification process by altering the eutectic Si growth. Graphical abstract: