Effect of Selected Alloying Elements on Aluminium Physical Properties and its Effect on Homogenization after Casting

Abstract:

Modern technology for near net shape aluminium alloy flat rolled products includes twin roll casting, cold rolling and heat treatment. The technology is most common for 1XXX, 3XXX and 8XXX aluminium alloys. In fact, this technology of cold forming is applied to materials with as cast structure which may in some cases limit formability during rolling. As a consequence, the fundamental operation for high quality products is a well chosen homogenization process of material after casting. During the homogenization of 8XXX alloys after twin roll casting, important changes in electrical conductivity of the material have been reported in the literature. Possibly, the observed effects are connected with the migration of alloying element atoms in the microstructure. This study presents the influence of selected alloying elements on the electrical conductivity and mechanical properties of aluminium. On this basis, it is possible to analyse the effect and level of diffusion of alloying elements from particles to matrix and from matrix to particles during homogenization of 8XXX alloys in as cast temper. Additional comparison of experimental results with theoretical considerations via Nordheim’s rule was also analyzed in this study.

• Periodical: Materials Science Forum (Volume 765)
• Pages: 471-475
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.765.471
• Online since: July 2013
• Authors: Tadeusz Knych, Andrzej Mamala, Wojciech Ściężor
• Keywords: 8XXX Aluminium Alloys, Electrical Conductivity, Homogenization, Twin Roll Casting (TRC)

References

[1] N.C.W. Kuijpers, Intermetallic phase transformations during homogenization of 6xxx Al alloys, a literature review, Internal report NIMR, Delft, 2000.

[2] M. Rosefort, Ch. Matthies, H. Buck, H. Koch, Using SEM and EDX for a simple differentiation Of α- and β-AlFeSi phases in wrought aluminum billets, St. J. Lindsay (Eds.) Light Metals 2011, TMS (The Minerals, Metals & Materials Society) 2011, pp.711-716.

DOI: 10.1002/9781118061992.ch124

[3] H. Tanihata, T. Sugawara, K. Matsuda, S. Ikeno, Effect of casting and homogenizing treatment conditions on the formation of Al–Fe–Si intermetallic compounds in 6063 Al–Mg–Si alloys, J. Mater. Sci. 34 (1999) 1205-1210.

[4] C.M. Allen, K.A.Q. O'Reilly, B. Cantor, P.V. Evans, Intermetallic phase selection in 1XXX Al alloys, Prog. Mater. Sci. 43 (1998) 89-170.

DOI: 10.1016/s0079-6425(98)00003-6

[5] G. Stephen, Al-Fe-Si intermetallics in 1000 series aluminum alloys, Phd Thesis, McGill University, Montreal, 1994.

[6] Z. Chen, S. Li, J. Zhao, Homogenization of twin-roll cast A8006 alloy, Trans. Nonferrous Met. Soc. China 22(2012) 1280−1285.

DOI: 10.1016/s1003-6326(11)61316-2

[7] Y. Birol, Effect of homogenization on recrystallization in a twin-roll cast Al–Fe–Si alloy, J. Mater. Sci. 43 (2008) 4652–4657.

DOI: 10.1007/s10853-008-2663-5

[8] R. Iricibar, C. Pampillo, H. Chia, Metallurgical aspects of Aluminum Alloys for Electrical Applications, Aluminum Transformation Technology and Applications Conference, P-Mad. 1980.

[9] P.L. Rossitier, The electrical resistivity of metals and alloys, Cambridge University Press, (2001)

[10] J.E. Hatch, Aluminum: properties and physical metallurgy, Aluminum Association, American Society for Metals ASM, 2005.

[11] F. Kutner, Aluminium - monograph, aluminium conductor materials, Aluminium-Verlag, 1981.

[12] N.C.W. Kuijpers, F.J. Vermolen, C. Vuik, P.T.G. Koenis, K.E. Nilsec, S. Van Der Zwaag, The dependence of theβ-AlFeSi to α-Al(FeMn)Si transformation kinetics in Al–Mg–Si alloys on the alloying elements, Mat. Sci. Eng. A 394 (2005) 9-19.

DOI: 10.1016/j.msea.2004.09.073