Abstract
In recent years, the deterioration in the available coke quality for anode production has led to increased levels of metal impurities such as nickel and vanadium in primary aluminum. There is growing concern from the industry with regard to the impact of increased Ni and V levels on the downstream properties of Al alloy products. This article presents a detailed investigation of the influences of Ni and V impurities on microstructure of three common Al alloys, i.e., AA6063, AA3102, and A356, in both as-cast and heat-treated conditions. The characterization techniques employed include scanning electron microscopy, electron backscattered diffraction, energy-dispersive x-ray spectroscopy, wavelength-dispersive spectroscopy, and transmission electron microscopy. It is shown that the phase constituents of AA6063 are not altered by Ni additions up to 0.05% or V additions up to 0.04%. Whereas there is no change in phase constituents with increasing Ni up to 0.015% for AA3102, the addition of 0.05% Ni seems to have significant influence on the microstructure. For A356, Ni additions up to 0.02% do not seem to have significant influence on the microstructure, but a new phase with significantly high Ni content is formed when the Ni impurity level is increased to 0.05%. The deep insight obtained in this work should be helpful to understand the influences of Ni and V impurities on properties of Al alloys.
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References
F. Vogt, R. Tonti, M. Hunt, and L. Edwards, Light Metals 2004, ed. A.T. Tabereaux (Warrendale, PA: TMS, 2004), pp. 489–493.
L. Edwards, Proc. 9th Australasian Aluminum Smelting Technology Conf., ed. M. Skyllas-Kazacos and B. J. Welch (Sydney, Australia: School of Chemical Sciences & Engineering, UNSW, 2007), CD-ROM.
L. Edwards, Proc. 10th Australian Aluminum Smelting Conf., ed. B. Welch, G. Stephens, J. Metson, and M. Skyllas-Kazacos (Sydney, Australia: School of Chemical Sciences & Engineering, UNSW, 2011), CD-ROM.
L. Edwards, F. Vogt, and J. Wilson, Light Metals 2001, ed. J. Anjier (Warrendale, PA: TMS, 2001), pp. 689–694.
J. Grandfield and J.A. Taylor, Aluminium Cast House Technology XI, ed. J.A. Taylor, J.F. Grandfield, and A. Prasad (Zurich, Switzerland: Trans Tech Publications Ltd., 2010), pp. 129–136.
J. Grandfield, L. Sweet, C. Davidson, J. Mitchell, A. Beer, S. Zhu, X. Chen, and M. Easton, Light Metals 2013, ed. B. Sadler (Warrendale, PA: TMS, 2013), pp. 39–45.
J.-M. Song, T.-Y. Lin, and H.-Y. Chuang, Mater. Trans. 48, 854 (2007).
S.P. Murarka, M.S. Anand, and R.P. Agarwala, Acta Metall. 16, 69 (1968).
I.J. Polmear, Light Alloys, 4th ed. (Oxford, U.K.: Butterworth-Heinemann, 2005).
U. Mannweiler, D. Rodriguez, W. Schmidt-Hatting, and A. Maitland, Light Metals 1989, ed. P.G. Campbell (Warrendale, PA: TMS, 1989), pp. 449–454.
A.H.R. Maitland (Paper presented at the 8th Internationale Leichtmetalltagung, ed. E. Louis and C. Carcia Cordovilla, 1987), pp. 423–425.
G. Jha, F.R. Cannova, S.K. Das, and B.A. Sadler, U.S. patent 20090028746 (2009).
L. Sweet, S. Zhu, S. Gao, J.A. Taylor, and M.A. Easton, Metall. Mater. Trans. A 42, 1737 (2011).
P. Villers and L.D. Calver, Pearson’s Handbook of Crystallographic Data for Intermetallic Phases, 2nd ed. (Materials Park, OH: ASM International, 1991), pp. 825–832.
I. Miki, H. Kosuge, and K. Nagahama, J. Jpn. Inst. Light Met. 25, 1 (1975).
P. Skjerpe, Metall. Trans. A 18, 189 (1987).
Acknowledgements
This work was funded by the Australian Government’s Cooperative Research Centres (CRC) scheme, Pacific Aluminium and Rio Tinto Alcan. The Monash Centre for Electron Microscopy (MCEM) and The University of Queensland Centre for Microscopy and Microanalysis are acknowledged for access to experimental facilities.
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Zhu, S., Yao, JY., Sweet, L. et al. Influences of Nickel and Vanadium Impurities on Microstructure of Aluminum Alloys. JOM 65, 584–592 (2013). https://doi.org/10.1007/s11837-013-0572-9
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DOI: https://doi.org/10.1007/s11837-013-0572-9