Characterization of Fe-Rich Intermetallic Phases in a 6xxx Series Al Alloy


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Intermetallic phases formed during directional Bridgman solidification of a 6xxx series Al alloy in the growth velocity range 5-120 mm/min have been characterised using conventional and high-resolution transmission electron microscopy. Cubic αc-AlFeSi and β-AlFeSi were always present in the alloy, but Al13Fe4 was only observed at 5mm/min and monoclinic αT-AlFeSi at 80 mm/min. Cubic αc-AlFeSi was observed to have a variety of morphologies resulting from flexibility in its growth mechanisms. β-AlFeSi with twins and faults showed strongly anisotropic growth by steps, resulting in its platelet morphology. Occasionally blocky β-AlFeSi particles were observed particularly at 30-60 mm/min, suggesting that other mechanisms could influence their morphology. Two types of composite particles, β-AlFeSi/Al13Fe4 and β-AlFeSi/cubic αc-AlFeSi, were observed in this alloy, and likely formed by two quasi-peritectic reactions.



Materials Science Forum (Volumes 519-521)

Edited by:

W.J. Poole, M.A. Wells and D.J. Lloyd




G. Sha et al., "Characterization of Fe-Rich Intermetallic Phases in a 6xxx Series Al Alloy", Materials Science Forum, Vols. 519-521, pp. 1721-1726, 2006

Online since:

July 2006




[1] Chen, X.G. and Langlais, J., Materials Science Forum vols. 331-337 (2000), 215.

[2] Phragmen, G., J. Inst. Met. 77 (1950), 489.

[3] Munson, D., J. Inst. Met., 95 (1967), 217.

[4] Rivlin, V.G. and Raynor, G.V., Int. Met. Rev. 26(3) (1981), 133.

[5] Allen, C.M., O'Reilly, K.A.Q., Cantor, B. and Evans, P.V., Prog. Mat. Sci. 43 (1998), 89.

[6] Dons, A.L., Z. Metallkd., 76 (1985), 609.

[7] Liu, P., Thorvaldsson, T. and Dunlop, G.L., Mater. Sci. Technol. 2 (1986), 1009.

[8] Westengen, H., Z. Metallkd. 75 (1984), 170.

[9] Hsu, C., O'Reilly, K.A.Q., Cantor, B. and Hamerton, R., Mater. Sci. and Eng. A304-306 (2001), 119.

[10] Tanihata, H., Matsuda, K. and Ikeno, S., Mater. Sci. Forum vol. 217-222 (1996) 809.

[11] Mulazimoglu, M. Zaluska, H., Gruzlaski, A., J. E. and Paray, F., Metall. & Mater. Trans. A, 27A (1996), 929.

[12] Cooper, M. Acta Cryst. 23 (1967), 1106.

[13] Dons, A.L., Z. Metallkde, 75 (1984), 171.

[14] Cooper, M. and Robinson, K., Acta Cryst. 20 (1966), 614.

[15] Dons, A.L., Z. Metallkde, 76 (1985), 151.

[16] Hansen V, Hauback B, Sundberg m, Rømming Chr. And Glønnes J, Acta Cryst. B54 (1998), 351.

[17] Sha, G., O'Reilly, K.A.Q., Cantor, B., Titchmarsh, J.M., Hamerton, R.G., Acta Mater., 51 (2003), 1883.

[18] Kerr, H.W. and Kurz, W., Int. Mater. Rev., 41 (1996), 129.