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On the Role of Copper and Cooling Rates on the Microstructure, Defect Formations and Mechanical Properties of Al-Si-Mg Alloys

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DOI: 10.4236/msa.2013.43020    4,663 Downloads   7,670 Views   Citations

ABSTRACT

This paper aims to assess the role of Cu on Al-Si-Mg alloys, in a range of 0 - 5 wt%, qualitatively on microstructure, defect formation, in terms of porosity, and strength in the as-cast conditions. The ternary system of Al-Si-Mg, using the A356 alloy as a base material, were cast using the gradient solidification technique; applying three different solidification rates to produce directional solidified samples with a variety of microstructure coarsenesses. Microstructural observations reveal that as the Cu levels in the alloys are increased, the amounts of intermetallic compounds as well as the Cu concentration in the α-Al matrix are increased. Furthermore, the level of porosity is unaffected and the tensile strength is improved at the expense of ductility.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

S. Seifeddine, E. Sjölander and T. Bogdanoff, "On the Role of Copper and Cooling Rates on the Microstructure, Defect Formations and Mechanical Properties of Al-Si-Mg Alloys," Materials Sciences and Applications, Vol. 4 No. 3, 2013, pp. 171-178. doi: 10.4236/msa.2013.43020.

References

[1] C. Caceres, I. L. Svensson and J. Taylor, “Strength-Ductility Behaviour of Al-Si-Cu-Mg Casting Alloys in T6 Temper,” International Journal of Cast Metals Research, Vol. 15, No. 5, 2003, pp. 531-543.
[2] S. Seifeddine and I. L. Svensson, “The Effect of Cooling Conditions and Variation of Alloying Elements on the Microstructural and Mechanical Properties of Al-7%Si Cast Alloys,” Giessereiforschung, Vol. 58, No. 3, 2006, pp. 50-54.
[3] A. L. Dons, G. Heiberg, J. Voje, J. S. Maeland, J. O. Loland and A. Prestmo, “On the Effect of Additions of Cu and Mg on the Ductility of AlSi Foundry Alloys Cast with a Cooling Rate of Approximately 3 K/s,” Materials Science and Engineering A, Vol. 413, 2005, pp. 561-566. doi:10.1016/j.msea.2005.09.053
[4] S. G. Shabestari and H. Moemeni “Effect of Copper and Solidification Conditions on the Microstructure and Mechanical Properties of Al-Si-Mg Alloys,” Journal of Materials Processing Technology, Vol. 153-154, 2004, pp. 193-198. doi:10.1016/j.jmatprotec.2004.04.302
[5] C. H. Caceres, M. B. Djurdjevic, T. J. Stockwell and J. H. Sokolowski, “The Effect of Cu Content on the Level of Microporosity in Al-Si-Cu-Mg Alloys,” Scripta Materialia, Vol. 40, No. 5, 1999, pp. 631-637. doi:10.1016/S1359-6462(98)00492-8
[6] F. Grosselle, G. Timelli and F. Bonollo, “Doe Applied to Microstructural and Mechanical Properties of Al-Si-Cu-Mg Casting Alloys for Automotive Applications,” Materials Science and Engineering A, Vol. 527, No. 15, 2010, pp. 3536-3545. doi:10.1016/j.msea.2010.02.029
[7] Z. Muzaffer, K. Erdem and G. Serap, “Influence of Cu Addition on Microstructure and Hardness of Near-Eutectic Al-Si-xCu-Alloys,” Transactions of Nonferrous Metals Society of China, Vol. 21, No. 8, 2011, pp. 1698-1702. doi:10.1016/S1003-6326(11)60917-5
[8] M. Easton, C. Davidson and D. St John, “Effect of Alloy Composition on the Dendrite Arm Spacing of Multicomponent Aluminum Alloys,” Metallurgical and Materials Transactions A, Vol. 41, No. 6, 2010, pp. 1528-1538.
[9] E. H. Samuel, A. M. Samuel and H. W. Doty. “Factors Controlling the Type and Morphology of Cu-Containing Phases in 319 Al Alloy,” AFS Transactions, Vol. 30, 1996, pp. 893-901.
[10] A. M. Samuel, P. Ouellet, F. H. Samuel and H. W. Doty, “Microstructural Interpretation of Thermal Analysis of Commercial 319 Al Alloy with Mg and Sr Additions,” AFS Transactions, Vol. 105, 1997, pp. 951-962.
[11] E. Sjolander, “Heat Treatment of Al-Si-Cu-Mg Casting Alloys,” Ph.D Dissertation, Chalmers University of Technology, Gothenburg, 2011,
[12] L. Pedersen and L. Arnberg, “Anomalous Microsegregation in Al-Si Foundry Alloys,” Materials Science and Engineering A, Vol. 241, No. 1-2, 1998, pp. 285-289. doi:10.1016/S0921-5093(97)00490-5
[13] A. L. Dons, L. Pedersen and L. Arnberg, “The Origin of ‘Anomalous’ Microsegregation in Al-Si Foundry Alloys—Modelling and Experimental Verification” Materials Science and Engineering A, Vol. 271, No. 1-2, 1999, pp. 91-94. doi:10.1016/S0921-5093(99)00273-7
[14] S. Seifeddine, S. Johansson and I. L. Svensson, “The Influence of Cooling Rate and Manganese Content on the Al5FeSi Phase Formation and Mechanical Properties of Al-Si-Based Alloys,” Materials Science and Engineering A, Vol. 490, No. 1-2, 2008. pp. 385-390. doi:10.1016/j.msea.2008.01.056
[15] E. Sjolander and S. Seifeddine, “Optimization of Solution Treatment of Cast Al-7Si-0.3Mg and Al-8Si-3Cu-0.5Mg Alloys,” Submitted to the Metallurgical and Materials Transactions A, (ISSN 1073-5623) (EISSN 1543-1940).
[16] M. Qian, F. Yi, D. Zhang, X. Pan, H. D. Brody and J. E. Morral, “Solute Distribution and Phase Appearance in As-Cast Al-Si-Cu-Mg-Fe Alloys,” ASM International, Pittsburgh, 2003, pp. 69-78.
[17] E. Sjolander and S. Seifeddine, “Optimisation of Solution Treatment of Cast Al-Si-Cu Alloys,” Materials and Design, Vol. 31, Suppl. 1, 2010, pp. S44-S49. doi:10.1016/j.matdes.2009.10.035
[18] Y. M. Han, A. M. Samuel, F. H. Samuel, S. Valtierra and H. W. Doty, “Effect of Solution Heat Treatment Type on the Dissolution of Copper Phases in Al-Si-Cu-Mg Type Alloys,” AFS Transactions, Vol. 116, 2008, pp. 79-90.
[19] J. Campbell, “Castings,” 2nd Edition, Butterworth-Heinemann Ltd., Oxford, 2003.
[20] T. S. Shih, L. W. Hang and Y. J. Chen, “Relative Porosity in Aluminium and in Aluminium Alloys,” International Journal of Cast Metals Research, Vol. 18, No. 5, 2005, pp. 301-308. doi:10.1179/136404605225023135
[21] L. Backerud, “Solidification Characteristics of Aluminum Alloys,” Amer Foundry Society, Schaumburg, 1990.
[22] A. Morri, L. Ceschini, I. L. Svensson and S. Seifeddine, “Relationship between Pore Volume (by Density Measurements) and Pore Area (on Fracture Surfaces) of A356 Fatigue Specimens,” TMS Annual Meeting, Vol. 2, 2012, pp. 233-240.
[23] L. Wang, M. Makhlouf and D. Apelian, “Aluminium Die Casting Alloys: Alloy Composition, Microstructure, and Properties-Performance Relationships,” International Materials Reviews, Vol. 40, No. 6, 1995, pp. 221-238.
[24] E. H. Samuel, A. M. Samuel and H. W. Doty, “Factors Controlling the Type and Morphology of Cu-Containing Phases in 319 Al Alloy,” AFS Transactions, Vol. 30, 1996, pp. 893-901.
[25] H. De La Sablonnière and F. H. Samuel, “Solution Heat Treatment of 319 Aluminium Alloy Containing Approx 0.5 wt% Mg, Part I, Solidification and Tensile Properties,” Cast Metals, West Bromwichm, 1996, pp. 195-211.

  
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