Characterisation of AlFeSi Intermetallics in 6000 Series Aluminium Alloy Extrusions

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Alloys designed to optimise strength and extrudability have a lower alloy Mg to Si ratio than has commonly been used in AA6060 and AA6063 alloys. Intermetallic phases have an impact on alloy design since they tie up some of the Mg and Si alloy content. The effect of Mg and Si alloy content on the type of intermetallic phases present has been investigated using TEM, SEM and Thermocalc analysis. Results for Al-Mg-Si-Fe alloys with 0.46 - 0.70 wt%Mg, 0.27 - 1.24 wt%Si and 0.09 - 0.22 wt%Fe are presented. The occurrence of a-AlFeSi (various stoichiometries), b- Al5FeSi, p-Al8FeSi6Mg3, Mg2Si and Si has been found to depend on alloy composition within the ranges examined.

Info:

Periodical:

Materials Science Forum (Volumes 519-521)

Edited by:

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

Pages:

303-308

DOI:

10.4028/www.scientific.net/MSF.519-521.303

Citation:

M. J. Couper et al., "Characterisation of AlFeSi Intermetallics in 6000 Series Aluminium Alloy Extrusions", Materials Science Forum, Vols. 519-521, pp. 303-308, 2006

Online since:

July 2006

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$35.00

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[6] M. Qian, D.H. St. John, S. Maloney, M.J. Couper, 8th International Conference on Aluminium Alloys, ICAA8, Cambridge, July 2002. Appendix A : Intermetallic phase type, stoichiometry and compositions in at% and wt% Atomic % Weight % Phase Form Al Fe Si Mg Fe: Si Al Fe Si Mg Fe: Si Al7Fe3Si 63. 6 27. 3 9. 1 - 3 49. 1 43. 6 7. 3 - 6. 0 α-AlFeSi Al12Fe3Si 74. 9 18. 8 6. 3 - 3 62. 4 32. 2 5. 4 - 6. 0 Al8Fe2Si 66. 7 22. 2 11. 1 - 2 60. 7 31. 4 7. 9 - 4. 0 Al15Fe3Si2 75. 0 15. 0 10. 0 - 1. 5 64. 5 26. 6 8. 9 - 3. 0 β-AlFeSi Al5FeSi 71. 4 14. 3 14. 3 - 1. 0 61. 7 25. 5 12. 8 - 2. 0 π-AlFeSiMg Al8FeSi6Mg3 44. 4 5. 6 33. 3 16. 7 0. 2 42. 1 10. 9 32. 8 14. 2 0. 3 Mg-Si Mg2Si - - 33. 3 66. 7 - - - 36. 6 63. 4.

DOI: 10.4028/www.scientific.net/msf.396-402.107

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