Abstract
After the nucleation and sedimentation of primary Fe-rich phases, the microstructures of Al-11.5Si-0.4Mg cast alloys with 0.35–1.03Fe and 0.18–0.59Mn have been studied to investigate the solidification characteristics of Fe-rich phases. Depending on the iron and manganese contents as well as cooling rates, Fe-rich phases may solidify as predendritic (primary), pre-eutectic, coeutectic, and posteutectic intermetallics at the different stages of solidification through three types of reactions: (1) predendritic (primary), (2) eutectic, and (3) peritectic reactions. It seems that Fe-rich phases may nucleate on the wetted sides of double oxide films, while the gap of the dry sides of oxide films constitutes the cracks commonly observed in the Fe-rich phases and aluminum matrix. Conventional metallurgical observations also suggest that the Fe-rich phases nucleated early during the solidification might act as nuclei for those formed subsequently, although it has not been ruled out that these phases may share the same oxide substrates. It is probable that these nucleation events may all work as suggested in the possible nucleation hierarchy for Al-11.5Si-0.4Mg cast alloys.
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References
J. Campbell: Casting, Butterworth-Heinemann, Oxford, United Kingdom, 1991.
J.R. Davis: ASM Speciality Handbook, ASM, Materials Park, OH, 1993, pp. 199–230.
D. Apelian: in Advances in Aluminium Casting Technology, M. Tiryakioglu and J. Campbell, eds., ASM International, OH, 1998, pp. 153–62.
X. Cao: Ph.D. Thesis, University of Birmingham, Birmingham, 2001.
X. Cao and J. Campbell: Materials Solutions 2002—Advances in Aluminium Casting Technology II, Columbus, OH, Oct. 7–10, 2002, ASM International, Materials Park, OH, 2002, pp. 135–46.
X. Cao and J. Campbell: AFS Trans., 2000, vol. 108, pp. 391–400.
X. Cao and J. Campbell: Int. J. Cast Met. Res., 2000, vol. 13 (3), pp. 175–84.
X. Cao and J. Campbell: AFS Trans., 2001, vol. 109, pp. 501–15.
X. Cao and J. Campbell: Int. J. Cast Met. Res., 2003, vol. 15, pp. 595–608.
X. Cao and J. Campbell: Metall. Mater. Trans. A, 2003, vol. 34A, pp. 1409–20.
K. Werfers and C. Misra: Alcoa Technical Paper No. 19 (Revised), “Oxides and Hydroxides of Aluminum”, Alcoa Laboratories, Aloca, PA, 1987.
L. Backerud, G. Chai, and J. Tamminen: Solidification Characteristics of Aluminium Alloys, Foundry Alloys, AFS/Skanaluminum, Skanaluminium, Oslo, Norway, 1990, vol. 2, pp. 71–84.
H.S.H. Lo: Ph.D. Thesis, University of Birmingham, Birmingham, 1998.
J. Tamminen: Ph.D. Thesis, University of Stockholm, Stockholm, 1988, No. 2.
L.F. Mondolfo: Aluminium Alloys: Structure and Properties, Butterworth and Co., London, 1976, pp. 534–37.
L.F. Mondolfo: Manganese in Aluminium Alloys, The Manganese Centre, Neuilly sur Seine, France, 1978.
K.S. Tang and T. Sritharan: Mater. Sci. Technol., 1998, vol. 14, pp. 738–42.
J.E. Gruzleski: AFS Trans., 1992, vol. 100, pp. 673–83.
C.M. Allen, K.A.Q. O’Reilly, B. Cantor, and P.V. Evans: Process Mater. Sci., 1998, vol. 43, pp. 89–170.
A. Couture: AFS Int. Casting Met. J., 1981, vol. 6 (4), pp. 9–17.
P.N. Crepeau: AFS Trans., 1995, vol. 103, pp. 361–66.
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Cao, X., Campbell, J. The solidification characteristics of Fe-rich intermetallics in Al-11.5Si-0.4Mg cast alloys. Metall Mater Trans A 35, 1425–1435 (2004). https://doi.org/10.1007/s11661-004-0251-0
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DOI: https://doi.org/10.1007/s11661-004-0251-0