Abstract
The microstructure evolution of a high-pressure die-cast AlSi9Cu3(Fe) alloy is studied over different Fe, Mn and Cr content. Fe-rich intermetallic phases were characterized by using optical microscope, image analysis, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS). The results revealed that the amount of Fe-rich phases as well their size increase by increasing the elemental content. Needle-like particles appear in the alloy with higher Fe:Mn ratio, while coarse α-phases assume polygonal, stark-like or Chinese script morphology according to the Fe:Mn:Cr balance as revealed by EDS analysis. The 3D-SEM investigation suggests that both the polygonal and stark-like morphology can be associated to a rhombic dodecahedron structure. The morphology evolution of the Fe-bearing particles as a function of the chemical composition and casting process is proposed and discussed.
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References
J.A. Taylor, “Iron-containing intermetallic phases in Al-Si based casting alloys”, Procedia Materials Science, 1 ( 2012 ), 19–33.
S. Seifeddine, S. Johansso and I. L. Svensson, “The influence of cooling rate and manganese content on the ß-AlsFeSi phase formation and mechanical properties of Al-Si-based alloys”, Materials Science and Engineering A, 490 (2008), 385–390.
G. Gustafsson, T. Thorvaldsson and G.L. Dunlop, “The Influence of Fe and Cr on the Microstructure of Cast Al-Si-Mg Alloys”, Metallurgical Transactions A, 17 (1986), 45–52.
Y. Zedan, F.H. Samuel, A.M. Samuel, H.W. Doty, “Effects of Fe intermetallics on the achinability of heat-treated Al-(7-ll)% Si alloys”, Journal of Materials Processing Technology, 210(2) (2010), 245–257.
L. Lu and A.K. Dahle, “Iron-Rich Intermetallic Phases and Their Role in Casting Defect Formation in Hypoeutectic Al-Si Alloys, Metallurgical and Materials Transactions A, 36 (2005), 819–835.
W. Eidhed, “Modification of ß-Al5FeSi Compound in Recycled Al-Si-Fe Cast Alloy by Using Sr, Mg and Cr Additions”, Journal of Materials Science and Technology, 24 (2008), 45–47.
W. Khalifa, A. M. Samuel, F. H. Samuel, H. W. Doty and S. Valtierra, “Metallographic observations of ß-AlFeSi phase and its role in porosity formation in Al-7%Si alloys”, International Journal of Cast Metals Research, 19(2006), 156–166.
J.R. Davis, Aluminum and Aluminum Alloys (Ohio: ASM Specially Handbook, International Materials Park, 1993), 98–99.
S. Belmares-Perales, M. Castro-Roman, M. Herrera-Trejo and L. E. Ramirez-Vidaurri, “Effect of cooling rate and Fe/Mn weight ratio on volume fractions of a-AlFeSi and ß-AlFeSi phases in Al-7.3Si-3.5Cu alloy”, Metals and Materials International, 14 (2008), 307–314.
S. Ji, W. Yang, F. Gao, D. Watson and Z. Fan, “Effect of iron on the microstructure and mechanical property of Al-Mg-Si-Mn and Al-Mg-Si diecast alloys”, Materials Science and Engineering A, 564 (2013), 130–139.
J. Serâk and D. Vojtëch, “Influence of (AlSiFeMnCr) intermetallic phases on the casting properties of AlSi9Cu2FeMnCr alloys”, Aluminium, 78(2002), 384–387.
B. Kim, S. Lee and H. Yasuda, “Morphological Variation of the Fe/Cr-containing Intermetallic Phase in the Al-Si casting Alloy as a Function of Cooling Rate: Time-Resolved Radiography”, Materials Science Forum, 654–656 (2010), 974–977.
G. Timelli, S. Ferraro, F. Grosselle, F. Bonollo, F. Voltazza and L. Capra, “Caratterizzazione meccanica e microstrutturale di leghe di alluminio pressocolate”, La Metallurgia Italiana, 1 (2011), 5–17.
J.L. Jorstad, “Understanding Sludge”, Die Casting Engineer, 30 (1986), 30–36.
S.G. Shabestari, “The effect of iron and manganese on the formation of intermetallic compounds in aluminum-silicon alloys”, Materials Science and Engineering A, 383 (2004) 289–298.
H. Kang, X. Li, Y. Su, D. Liu, J. Guo and H. Fu, “3-D morphology and growth mechanism of primary AUMn intermetallic compound in directionally solidified Al-3at.%Mn alloy”, Intermetallics, 23 (2012), 32–38.
Q.D. Qin, Y.G. Zhao, W. Zhou and P.J. Cong, “Effect of phosphorus on microstructure and growth manner of primary Mg2Si crystal in Mg2Si/Al composite, Materials Science and Engineering A, 447 (2007), 186–191.
M.F. Ourfali, I. Todd and H. Jones, “Effect of Solidification Cooling Rate on the Morphology and Number per Unit Volume of Primary Mg2Si Particles in a Hypereutectic Al-Mg-Si Alloy, Metallurgical and Materials Transaction A, 36 (2005), 1368–1372.
R.-Y. Wang, W.-H. Lu and L.M. Hogan, “Faceted Growth of Silicon Crystals in Al-Si Alloys”, Metallurgical and Materials Transactions A, 28 (1997), 1233–1243.
C. Li, Y.Y. Wu, H. Li and X.F. Liu, “Morphological evolution and growth mechanism of primary Mg2Si phase in Al-Mg2Si alloys”, Acta Materialia, 59 (2011), 1058–1067.
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Fabrizi, A., Ferraro, S., Timelli, G. (2014). The Influence of Fe, Mn and Cr Additions on the Formation of Iron-Rich Intermetallic Phases in an Al-Si Die-Casting Alloy. In: Tiryakioğlu, M., Campbell, J., Byczynski, G. (eds) Shape Casting: 5th International Symposium 2014. Springer, Cham. https://doi.org/10.1007/978-3-319-48130-2_34
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DOI: https://doi.org/10.1007/978-3-319-48130-2_34
Publisher Name: Springer, Cham
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