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Formation of Iron-Rich Intermetallic Phases in Al-7Si-Mg: Influence of Cooling Rate and Strontium Modification
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0003-0260-5153
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-0101-0062
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-3184-7592
2019 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 50, no 9, p. 4148-4165Article in journal (Refereed) Published
Abstract [en]

The influence of cooling rate on the formation of iron-rich intermetallic phases during solidification of unmodified and strontium-modified Al-7Si-0.3Mg alloys has been investigated. The effect of strontium on the intermetallic phases was evaluated in unquenched and quenched samples. Samples were quenched before the start of the Al-Si eutectic reaction, along the Al-Si eutectic reaction and just after the end of solidification. The results show that the addition of strontium increased the size of both β-Al5FeSi and π-Al8FeMg3Si6 at low cooling rates. For unmodified and strontium-modified alloys, an increase of cooling rate resulted in a decrease in size of the intermetallic phases, particularly in the strontium modified alloy. In the strontium modified alloy quenched before the start of the Al-Si eutectic reaction, π-Al8FeMg3Si6 appeared as thin platelets at the eutectic cell boundaries. Chinese script-like π-Al8FeMg3Si6 and platelet-like β-Al5FeSi intermetallic phases were observed uniformly distributed in the eutectic regions in the unmodified alloy quenched before the start of the eutectic reaction. Strontium modified semi-solid Al-7Si-0.3Mg castings were produced and the type of intermetallic phase, morphology, size, area fraction and distribution were similar to that observed in the strontium modified alloy quenched before the start of the Al-Si eutectic reaction.

Place, publisher, year, edition, pages
Springer, 2019. Vol. 50, no 9, p. 4148-4165
Keywords [en]
Aluminum alloys, Cooling, Eutectics, Intermetallics, Iron, Magnesium alloys, Platelets, Solidification, Strontium alloys, Al-7Si-0.3Mg alloys, Al-Si eutectic, Chinese script, Eutectic cells, Eutectic reactions, Intermetallic phase, Intermetallic phasis, Thin platelets, Silicon alloys
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-45391DOI: 10.1007/s11661-019-05343-5ISI: 000477997600021Scopus ID: 2-s2.0-85068741757Local ID: HOA JTH 2019OAI: oai:DiVA.org:hj-45391DiVA, id: diva2:1338528
Funder
Vinnova, 2014-05096Available from: 2019-07-23 Created: 2019-07-23 Last updated: 2019-08-15Bibliographically approved

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Santos, JorgeJarfors, Anders E.W.Dahle, Arne

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