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In-situ study of morphology and growth of primary α-Al(FeMnCr)Si intermetallics in an Al-Si alloy
Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.ORCID iD: 0000-0003-4005-812X
Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway.
Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.ORCID iD: 0000-0001-6481-5530
Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway.
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2017 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 130, 1-9 p.Article in journal (Refereed) Published
Abstract [en]

Morphology and growth of primary α-Al(FeMnCr)Si intermetallics have been studied in-situ during solidification of a commercial secondary aluminum alloy employing X-radiographic imaging combined with deep-etching. The α-Al(FeMnCr)Si intermetallics were found to nucleate primarily on surface oxides, and the continued growth yielded both rhombic dodecahedrons and elongated rod-like morphologies. Both morphologies were observed as hopper and massive types, where the hopper intermetallics had the higher growth rates. The growth rate, which determines the type, appears to be linked to nucleation frequency; higher nucleation frequency promoted massive types and lower nucleation frequency promoted hopper intermetallics. 

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 130, 1-9 p.
Keyword [en]
Aluminum, Casting, Crystal growth, Intermetallics, Primary α-Al(FeMnCr)Si, Aluminum alloys, Hoppers, Morphology, Nucleation, Silicon, Silicon alloys, Deep etching, In-Situ Study, Nucleation frequencies, Rhombic dodecahedron, Rod-like morphology, Secondary aluminum, Surface oxide, X-radiographic imaging
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-35343DOI: 10.1016/j.actamat.2017.03.026ScopusID: 2-s2.0-85015790499Local ID: JTHMaterialISOAI: oai:DiVA.org:hj-35343DiVA: diva2:1087917
Available from: 2017-04-10 Created: 2017-04-10 Last updated: 2017-04-12Bibliographically approved

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