Microstructure Characterizations of Hypereutectic Al-Si Alloys with Different Undercooling Levels

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Microstructural variation is quantitatively characterized by measured undercooling. For neareutectic Al-13wt%Si alloys, microstructure transitions, which include a phase change from eutectic to primary α-Al dendrite plus eutectic and a morphological change from α-Al dendrite to equiaxed Al grains, were observed with increasing undercooling levels. For hypereutectic Al-Si alloys, microstructure transitions, which include a morphological change of primary and eutectic Si crystals, were also obtained quantitatively by increasing undercooling.

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Periodical:

Materials Science Forum (Volumes 449-452)

Edited by:

S.-G. Kang and T. Kobayashi

Pages:

169-172

Citation:

H.S. Kang et al., "Microstructure Characterizations of Hypereutectic Al-Si Alloys with Different Undercooling Levels", Materials Science Forum, Vols. 449-452, pp. 169-172, 2004

Online since:

March 2004

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$38.00

[1] H.A.H. Steen, A. Hellawell: Acta Metall. 20(1972), p.363.

[2] F. Yilmaz and R. Elliott: J. Mater. Sci. 24(1989), p. (2065).

[3] F. Yilmaz, O.A. Atasoy, R. Elliott: J. Cryst. Growth 118(1992), p.377.

[4] J.H. Perepezko: Mater. Sci. Eng. 65(1984), p.1548.

[5] J. Lipton, W. Kurz, R. Trivedi: Acta. Mater. 35(1987), p.957.

[6] K.A. Jackson, J.D. Hunt: Trans. Metall. Soc. AIME, 236(1966), p.1129.

[7] X.J. Han, C. Yang, B. Wei, M. Chen, Z.Y. Guo: Mater. Sci. Eng. A307(2001), p.35.

[8] O.A. Atasoy, F. Yilmaz, R. Elliott: J. Cryst. Growth 66(1984), p.137.

[9] S.Z. Lu, A. Hellawell: J. Cryst. Growth 73(1985), p.316.

[10] H.S. Kang, W.Y. Yoon, to be submitted.