Abstract
The stringent requirements for pollution reduction are pushing the automotive industry towards the employment of lightweight structures and, therefore, aluminium and its alloys play a remarkable role. Al-Si casting alloy with eutectic or hypereutectic compositions are, normally, employed for the production of high performance automotive products such as pistons and engine blocks which have to withstand critical loading conditions (i.e. high temperature, high pressure and corrosive exhaust gases). In metals, adequate mechanical properties can be easily obtained providing that a sufficiently fine grain size is achieved but this is not the case for Al-Si cast alloys where commercial grain refiner developed on the base of the Al-Ti-B ternary system are highly ineffective due to the poisoning effect of silicon on titanium. The performance of a novel grain refiner in the form of powder addition developed at Brunel University, which can efficiently and reliably refine Al-Si alloys, are assessed in this work. Particularly, the effect of the addition of this novel grain refiner on the microstructural features of both binary hyper-eutectic and commercial Al-Si alloys is studied.
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References
I. J. Polmear, Light Alloys. From Traditional Alloys to Nanocrystals, 4th ed, Butterworth-Heinemann, UK, pp. 299–365, 2006
J. R. Davis, ASM Speciality Handbook: Aluminum and Aluminum Alloys, ASM International Light Alloys, Ohio, 1993
J. G. Kaufman, Mechanical Engineers Handbook: Materials and Mechanical Design, Volume 1, Third Edition, Aluminium Alloys (Chapter 3), ASM International Light Alloys, Ohio, 2006
H. Ye, “An Overview of the Development of Al-Si-Alloy Based Material for Engine Applications”, Journal of Materials Engineering and Performance, vol. 12, pp. 288–297, 2003
S.-Z. Lu and A. Hellawell, “Growth Mechanisms of Silicon in Al-Si Alloys”, Journal of Crystal Growth, vol. 73, pp. 316–328, 1985
S.-Z. Lu and A. Hellawell, “The Mechanism of Silicon Modification in Aluminium-Silicon alloys: Impurity Induced Twinning”, Metallurgical and Materials Transactions A, vol. 18, pp. 1721–1733, 1987
M. Shamsuzzoha and L. M. Hogna, “The Crystal Morphology of Fibrous Silicon in Strontium-modified Al-Si Eutectic”, Philosophical Magazine A, vol. 54, pp. 459–477, 1986
S.-Z. Lu and A. Hellawell, “Modification of Al-Si Alloys: Microstructure, Thermal Analysis and Mechanism”, JOM, vol. 47, pp. 38–40, 1995
A. Knuutinen, et al., “Modification of Al-Si alloys with Ba, Ca, Y and Yb”, Journal of Light Metals, vol. 1, pp. 229–240, 2001
G. P. Jones and J. Pearson, “Factors Affecting Grain Refinement of Aluminium using Ti and B Additives”, Metallurgical and Materials Transactions B, vol. 7, pp. 223–234, 1976
M. S. Lee and B. S. Terry, “Effect of Processing Parameters on a Luminide Morphology in Aluminium Grain Refining Master Alloy”, Materials Science and Technology, vol. 7, pp. 608–612, 1991
C. D. Mayes, D. G. McCartney and T. G. J., “Influence of Microstructure on Grain Refining Performance of Al-Ti-B Master Alloys”, Materials Science and Technology, vol. 9, pp. 97–103, 1993
A. Hardman and F. H. Hayes, “Al-Ti-B Grain Refining Alloys from Al, B2O3 and TiO2”, Materials Science Forum, vol. 247, pp. 217–222, 1996
M. Johnsson and L. Bäckerud, “The Influence of Composition on Equiaxed Crystal Growth Mechanisms and Grain Size in Al Alloys”, Zeitschrift für Metallkunde, vol. 85, pp. 781–785, 1994
P. S. Cooper, et al., “Characterisation of a New Generation of Grain Refiners for the Foundry Industry”, Light Metals, 2003
M. N. Binney, et al., “Grain Refinement of Secondary Aluminium-Silicon Casting Alloys”, Light Metals, 2003
S. A. Kori, et al., “Poisoning and Fading Mechanism of Grain Refinement in Al-7Si Alloy”, Materials Forum, vol. 29, pp. 387–393, 2005
D. Qiu, et al., “A Mechanism for the Poisoning Effect of Silicon on the Grain Refinement of Al-Si Alloys”, Acta Materialia, vol. 55, pp. 1447–1456, 2007
N. Hari Babu, M. Nowak and L. Bolzoni, “Grain Refiner for Al-Si Alloys”, Light Metals, pp. 1009–1012, 2013
L. Bolzoni, M. Nowak and N. Hari Babu, “Influence of a Novel Master Alloy Addition on the Grain Refinement of Al-Si Cast Alloys”, Materials Science Forum, vol. 765, pp. 311–315, 2013
T. Sritharan and H. Li, “Influence of Titanium to Boron Ratio on the Ability to Grain Refine Aluminium-Silicon Alloys”, Journal of Materials Processing Technology, vol. 63, pp. 585–589, 1997
S. Nafisi and R. Ghomashchi, “Grain Refining of Conventional and Semi-solid A356 Al-Si Alloy”, Journal of Materials Processing Technology, vol. 174, pp. 371–383, 2006
G. K. Sigworth and M. M. Guzowski, “Grain Refining of Hypoeutectic Al-Si Alloys”, AFS Transactions, vol. 93, pp. 907–912, 1985
W. Schneider, et al., “A Comparison of the Family of AlTiB Refiners and their Ability to Achieve Fully Equiaxed Grain Structure in DC Casting”, Light Metals, 2003
J. A. Taylor, “The Effect of Iron in Al-Si Casting Alloys” in 35th Australian Foundry Institute National Conference, Adelaide, South Australia, pp. 148–157, 2004
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Bolzoni, L., Nowak, M., Babu, N.H. (2014). On the Performance of A Novel Grain Refiner in Hyper-Eutectic Al-Si Cast Alloys. In: Grandfield, J. (eds) Light Metals 2014. Springer, Cham. https://doi.org/10.1007/978-3-319-48144-9_159
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DOI: https://doi.org/10.1007/978-3-319-48144-9_159
Publisher Name: Springer, Cham
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