The Metallurgy of Homogenisation

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Homogenisation of aluminium alloys is the high temperature heat treatment (450-600 °C) performed after casting and consists of three distinct steps; heat-up, soak and cooldown. This review considers the metallurgical importance of homogenisation and how it impacts on the further processing and final properties of some aluminium alloys, with emphasis on homogenisation of extrusion billet. The introduction of continuous homogenisation has significantly improved the temperature uniformity of homogenisation allowing the soak time to be minimised. Batch homogenisation, however, provides flexibility in practices tailored for different aluminium alloys. Soft 6060 and 6063 alloys are best homogenised at a higher soak temperature than harder alloys such as 6061 and 6082. The homogenisation cooling rate can also impact on the behaviour of the billet during extrusion processing as well as affecting the final mechanical properties. An understanding of the microstructural changes occurring as a result of homogenisation allows the cast house to ensure that the billet processing meets the customer requirements.

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264-275

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July 2011

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[1] M.J. Couper, M.A. Cooksey and N.V. Danilova in: Extrusion Technology Conference Proceedings Vol. I (2000), p.51

Google Scholar

[2] M.J. Couper, M. Cookesy and B. Rinderer, in: 7th Aluminium Cast House Technology, edited by P.R. Whiteley, TMS, (2001), p.287

Google Scholar

[3] H-T. Tan and C.H-C Lee, in: 7th Aluminium Cast House Technology, edited by P.R. Whiteley, TMS, (2001), p.297

Google Scholar

[4] Aluminium Association; Visual Quality Characteristics of Aluminium Extrusions, Washington DC (1993)

Google Scholar

[5] M.W. Meredith, J. Worth, J.M. Brown and R.G. Hamerton: Light Metals (2003), p.1111

Google Scholar

[6] H. Tanihata, T. Sugawara, K. Matsuda and S. Ikeno: J. Mater. Sci. Vol. 34 (1999), p.1205

Google Scholar

[7] M.J. Couper, B. Rinderer and J-Y. Yao: Mater. Sci. Forum Vols. 519-521 (2006) p.303

Google Scholar

[8] K.B.S. Couto, S.R. Claves, W.H. Van Geertruyden, M.Z. Misiolek and M. Goncalves: Mater. Sci. Tech. Vol. 21 No.2 (2005), p.263

Google Scholar

[9] Y. Birol: J. Mater. Process. Technol. Vol. 148 (2004), p.250

Google Scholar

[10] G. Mrówka-Nowotnik, J. Sieniawski and M. Wierzbinska: Mater. Sci. Eng. Vol. 28 No. 2 (2007), p.69

Google Scholar

[11] N.D.W. Kuijpers, J. Tirel, D.N. Hanlon and S. van der Zwaag: Mater. Charact. Vol. 48 (2002), p.379

Google Scholar

[12] N.D.W. Kuijpers, W.H. Kool, P.T.G. Koenis, K.E. Nilsen, I. Todd and S. van der Zwaag: Mater. Charact. Vol. 49 (2003), p.409

Google Scholar

[13] E.D. Sweet, E.S. Charles and M.J. Couper in: Proceedings of the 9th International Conference on Aluminium Alloys, Edited by J.F. Nie, A.J. Morton and B.C. Muddle, IMEA (2004) p.1198

Google Scholar

[14] L. Lodgaard and N. Ryum: Mater. Sci. Eng. Vol. A283 (2000), p.144

Google Scholar

[15] O. Reiso: Mater. Forum, Vol. 28 (2004) p.32

Google Scholar

[16] M. Cai, J. Robson, G.W. Lorimer and N.C. Parson: Mat. Sci. Forum Vols. 396-402 (2002) p.209

Google Scholar

[17] T. Pettersen, Y. Li, T. Furu and K. Martinsen: Mater. Sci. Forum Vols. 558-559 (2007) p.301

Google Scholar

[18] Y. Birol: J. Mater. Proc. Tech. Vol. 148 (2004), p.250

Google Scholar

[19] M. Rosefort, C. Matthies, H. Buck and H. Koch: Light Metals (2011), p.711

Google Scholar

[20] T. Minoda, H. Hayakawa, S. Matsuda and H. Yoshida in: Extrusion Technology Conference Proceedings, Vol. II (2000), p.23

Google Scholar

[21] S. Zajac, B. Hutchinson, A. Johansson and L-O. Gullman: Mater: Sci. Tech. Vol. 10 No.4 (1994), p.323

Google Scholar

[22] Y.V. Ramana, R. Kumar and N.K. Singh: Light Metals (2006), p.717

Google Scholar

[23] S.N. Samaras and G.N. Haidemenopoulos: J. Mater. Process. Technol. Vol. 194 (2007), p.63

Google Scholar

[24] J. Langerweger: Aluminum Vol. 58 No. 2 (1982), p.107

Google Scholar

[25] S. Zajac, B. Bengtsson, A. Johansson and L-O. Gullman: Mater. Sci. Forum Vols. 217-222 (1996), p.397

Google Scholar

[26] S. Zajac, B. Bengtsson and C. Jönsson: Mater. Sci. Forum Vols. 396-402 (2002), p.399

Google Scholar

[27] Basic Metallurgy 6000 series Extrusion Alloys, Comalco Publication

Google Scholar

[28] T. Sheppard in: Extrusion Technology Conference Proceedings (1977) p.331

Google Scholar

[29] O. Reiso in: Extrusion Technology Conference Proceedings, Vol. I (1984), p.31

Google Scholar

[30] O. Reiso in: Extrusion Technology Conference Proceedings, Vol. II (1988), p.287

Google Scholar

[31] N.C. Parson, J.D. Hankin and A.J. Bryant in: Extrusion Technology Conference Proceedings, Vol. I (1992), p.13

Google Scholar

[32] R. Shahani, R Tirard-Collet and C. Sigli in: Extrusion Technology Conference Proceedings, Vol. I (2000), p.13

Google Scholar

[33] B. Holme, S. Gouttebroze, C. Marioara, B.R. Henriksen and K. Lewin in: Extrusion Technology Conference Proceedings, Vol. I (2008)

Google Scholar