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On the Formation of Sludge Intermetallic Particles in Secondary Aluminum Alloys
University of Padova, Italy.
Jönköping University, Sweden.ORCID iD: 0000-0003-4005-812X
RISE - Research Institutes of Sweden, Materials and Production, SWECAST. Jönköping University, Sweden.
2015 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 46, no 8, p. 3713-3722Article in journal (Refereed) Published
Abstract [en]

The primary precipitation of Fe-rich intermetallics in AlSi9Cu3(Fe) type alloys is studied for different Fe, Mn, and Cr contents and cooling rates. Differential scanning calorimetry, thermal analysis, and interrupted solidification with a rapid quenching technique were used in combination in order to assess the nucleation temperature of sludge particles, as well as to follow their evolution. The results revealed that the sludge nucleation temperature and the release of latent heat during sludge formation are functions of Fe, Mn, and Cr levels in the molten alloy (i.e., the sludge factor, SF) and cooling rate. Moreover, it can be concluded that sensitivity to sludge formation is not affected by cooling rate; i.e., a decrease in the SF will reduce sludge nucleation temperature to the same extent for a higher cooling rate as for a lower cooling rate. The sludge formation temperature detected will assist foundries in setting the optimal molten metal temperature for preventing sludge formation in holding furnaces and plunger systems.

Place, publisher, year, edition, pages
2015. Vol. 46, no 8, p. 3713-3722
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13522DOI: 10.1007/s11661-015-2942-0Scopus ID: 2-s2.0-84932195555OAI: oai:DiVA.org:ri-13522DiVA, id: diva2:973732
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2019-07-05Bibliographically approved

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Bjurenstedt, Anton

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