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Journal of Materials Engineering and Performance

Published in:

13-03-2017

Comparison of Si Refinement Efficiency of Electromagnetic Stirring and Ultrasonic Treatment for a Hypereutectic Al-Si Alloy

Authors: Reza Haghayeghi, Leandro Cassio de Paula, Eugenio Jose Zoqui

Published in: Journal of Materials Engineering and Performance | Issue 4/2017

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Abstract

The effects of electromagnetic stirring, ultrasonic treatment (UT), and their combination on the Si particles refinement in a hypereutectic Al-Si alloy (A390) were examined. All three physical methods yielded a considerable change in the shape and size of the particles, with UT producing the finest size. The creation of holes inside the Si particles via the explosion of cavitation bubbles was determined to occur before fragmentation of primary Si. In addition, transmission electron microscopy analysis revealed twin formation on primary Si particles by application of an external field in the liquid. UT of the melt was sufficient to produce fine primary Si particles with average size of ~12 µm. The primary Si particles refinement and eutectic Si modification improved the mechanical properties.

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Title: Comparison of Si Refinement Efficiency of Electromagnetic Stirring and Ultrasonic Treatment for a Hypereutectic Al-Si Alloy
Authors: Reza Haghayeghi
Leandro Cassio de Paula
Eugenio Jose Zoqui
Publication date: 13-03-2017
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 4/2017
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-017-2602-1

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