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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 and Jelena Pavlovic
Published/Copyright: May 5, 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.


Literatur/References

1 Bäckerud, L.; Chai, G.; Tamminen, J.; “Solidification Characteristics of Aluminum alloys”, Volume 2, AFS/SKANALUMINIUM, Oslo, 1986, 95105Search in Google Scholar

2 Cibula, A.; “The Mechanism of Grain Refinement of Sand Castings in Aluminum Alloys”, J. Ins. Metals vol. 76, p. 312 (1949/50)Search in Google Scholar

3 Crossley, P.B.; MondolfoL.F.; “The Modification of Aluminum Silicon Alloys”, Modern Casting vol. 49, p. 53/64, (1966)Search in Google Scholar

4 Sigworth, G. K.; “Theoretical and Practical Aspect of the Modification of Al-Si Alloys”, AFS Transaction1983, 66, 716Search in Google Scholar

5 WangL.; ShivkumarS.; “Strontium Modification of Aluminum Alloy Casting in the Expendable Pattern Casting Process”, Journal of Material Science, 1995, 30, 1584159410.1007/BF00375269Search in Google Scholar

6 Garat, M.; Laslaz, G.; Jacob, S.; Meyer, P. et.al.; “State of the Art Use of Sb, Na and Sr Modified Al-Si Casting Alloys”, AFS Transaction, 1992, 146, 821832Search in Google Scholar

7 Apelian, D.; Sigworth, G. K.; Wahler, K. R.; “Assessment of Grain Refinement and Modification of Al-Si Foundry Alloys by Thermal Analysis”, AFS Transaction, 1984, 161, 297307Search in Google Scholar

8 Doty, H. W.; Samuel, A. M.; Samuel, F. H.; “Factors Controlling the Type and Morphology of Copper-Containing Phases in the 319 Aluminum Alloy”, 100th AFS Casting Congress, Philadelphia, Pennsylvania, USA, April 20-23, 1996Search in Google Scholar

9 Samuel, A. M.; Samuel, F. H.; “A Metallographic Study of Porosity and Fracture Behavior in Relation to the Tensile Properties in the 319.2 Chill Casting”, Metallurgical and Material Transaction A, 1995, 26A, 2359237210.1007/BF02671250Search in Google Scholar

10 Beumler, H.; Hammerstad, A.; Wieting, B.; DasGupta, R.; “Analysis of Modified 319 Aluminum Alloy”, AFS Transaction, (1988), 54, 112Search in Google Scholar

11 Mulazimoglu, M.; Tenekedjev, N.; Glosset, B.; Gruzleski, J.; “Microstructures and Thermal Analysis of Strontium Treated Al-Si Alloys”, American Foundrymen's Society, Inc.Des Plaines USA, 1995, 2340Search in Google Scholar

12 Argyropoulos, S.; Glosset, B.; Gruzleski, J.; Oger, H.; “The Quantitative Control of Modification in Al-Si Foundry Alloys Using a Thermal Analysis Technique”, AFS Transaction (1983), 27, 351358Search in Google Scholar

13 Djurdjevic, M.; Stockwell, T.; Sokolowski, J. H.; “The Effect of Strontium on the Microstructure of Aluminum-Silicon and Aluminum-Copper Eutectics in the 319 Alloy”, International Journal of Cast Metals Research, 1999, v. 12, 677310.1080/13640461.1999.11819344Search in Google Scholar

14 Shabestari, S.G.; GhodratS.; “Assessment of Modification and Formation of Intermetallic Compounds in Aluminium Alloy Using Thermal Analysis”, Materials Science and Engineering A476 (2007) pp. 150158Search in Google Scholar

15 Chen, X.; Geng, H.; Li, Y.; “Study on the Eutectic Modification Level of Al-7Si Alloy by Computer Aided Recognition of Thermal Analysis Cooling Curves”, Materials Science and Engineering A419 (2006) pp. 283289Search in Google Scholar

16 Castro-Roman, M.; Montes-Rodriguez, J.J.; Herrera-Trejo, M.; “Strontium Effect on the Solidification Path of a 319 Type Aluminum Alloy”, World Foundry Congress, 4-7 June 2006, Harrogate, UK, pp. 110Search in Google Scholar

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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