Startseite Quantification of the Impact of Strontium on the Solidification Path of the Aluminum-Silicon-Copper Alloys Using Thermal Analysis Technique
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Quantification of the Impact of Strontium on the Solidification Path of the Aluminum-Silicon-Copper Alloys Using Thermal Analysis Technique

  • Mile Djurdjevic , Glenn Byczynski , Carola Schechowiak , Hagen Stieler und Jelena Pavlovic
Veröffentlicht/Copyright: 5. Mai 2013
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Abstract

The impact of strontium on the solidification path of the AlSi6Cu4 aluminium alloy was examined. Strontium levels up to 210 ppm have been considered. The purpose of this study is: (i) to optimize the amount of strontium additions in AlSi6Cu4 melt in order to achieve the necessary degree of silicon modification and (ii) to observe the effects of strontium level on the other characteristic solidification temperatures of this alloy, with special emphasis on the nucleation temperature of copper rich phases. This investigation showed that a strontium level of approximately 140 ppm was sufficient to modify eutectic morphology of silicon in thermal analysis test samples. Increasing the strontium levels up to 210 ppm raises the nucleation temperature of copper rich phases, leading also to the higher area fraction of those phases.

Kurzfassung

Es wurde der Einfluss des Strontiums auf den Erstarrungsweg der AlSi6Cu4-Aluminium-Legierung untersucht. Es wurden Strontiumgehalte bis zu 210 ppm betrachtet. Diese Untersuchung hat den Zweck, (i) die Menge der Strontium-Zusätze in der AlSi6Cu4-Schmelze zu optimieren, um den erforderlichen Gehalt der Silicium-Modifizierung zu erzielen und (ii) die Einflüsse des Strontiumgehalts auf die anderen charakteristischen Erstarrungstemperaturen dieser Legierung festzustellen, wobei insbesondere die Keimbildungstemperatur der an Kupfer reichen Phasen hervorgehoben wird. Die Untersuchung hat gezeigt, dass ein Strontiumgehalt von annähernd 140 ppm ausreichte, um die eutektische Morphologie des Siliciums in den Thermoanalyse-Versuchsproben zu modifizieren. Durch Erhöhung der Strontiumgehalte bis auf 210 ppm steigt die Keimbildungstemperatur der an Kupfer reichen Phasen an, was auch zu einem höheren Flächenanteil dieser Phasen führt.


a Corresponding author/Korrespondenzautor: E-mail:

Prof. Dr. Glenn Byczynski Manager of Research and Development at Nemak Europe GmbH, received his Ph.D. in metallurgy and materials science from the University of Birmingham, U.K., in 2002. He is an Adjunct Assistant Professor in the Dept. of Mechanical, Automotive and Materials Engineering at the Faculty of Engineering at the University of Windsor, Canada.

Dipl.-Ing. Hagen Stieler is process-engineer at Nemak Wernigerode GmbH. He is in charge of the serial production of suspension parts and cylinder heads. He received his diploma in material science and technology with focus on casting technology from the Technical University Bergakademie Freiberg in 2007.


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Received: 2008-7-2
Accepted: 2008-9-3
Published Online: 2013-05-05
Published in Print: 2009-03-01

© 2009, Carl Hanser Verlag, München

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