Abstract
The present study was performed on a recently developed Al–Cu alloy, designed for automotive applications. This alloy has the composition Al-2%Cu-1.32%Si-0.42%Mg-0.58%Fe-0.59%Mn-0.07%Ti. It was determined that the alloy containing (0.5% Zr + 0.15% Ti) was the most effective in maximizing the alloy tensile strength over the range of aging temperatures studied, from 155 to 300 °C. The addition of Ag is beneficial at high aging temperatures, in the range of 240–300 °C when added simultaneously with 0.27 wt% Zr. However, it is less effective when compared to a high Zr concentration (about 0.62 wt%) at the same levels of Ti. It is concluded that the alloy tensile properties may be determined by contributions from different strengthening mechanisms, namely the grain size, the volume fraction of intermetallics produced, and evolution and growth of the hardening precipitates with respect to the aging conditions. Quality charts constructed from the tensile data may be used to select the appropriate metallurgical conditions for tailoring the alloy properties to those required for a specific application. Increasing the copper content from 2 to 3.5 wt% does not produce a significant increase in the alloy strength. However, it increases the calculated alloy density from approximately 2.78 to 2.93 g/cm3.
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References
Y.L. Chu, P.S. Cheng, R. Shivpuri, Soldering Phenomenon in Aluminum Die Casting: Possible Causes and Cures. NADCA Transactions, Paper No. T93–124, 1993, pp. 361–371
M.M. Makhlouf, D. Apelian, L. Wang, Microstructure and Properties of Aluminum Die Casting Alloys. NADCA Transactions, Paper No. DOE/ID/13320-2, 1998, pp. 116–132
A.C. Street, The Die Casting Book, 2nd edn. (Portcullis Press, Red Hill, England, 1990), pp. 611–658
E.M. Elgallad, F.H. Samuel, A.M. Samuel, H.W. Doty, Development of new Al–Cu based alloys aimed at improving the machinability of automotive castings. Int. J. Metalcasting 3, 29–41 (2009)
Y. Yi-Cong, H. Liang-Ju, L. Pei-Jie, Differences of grain-refining effect of Sc and Ti additions in aluminum by empirical electron theory analysis. Trans. Nonferrous Metals Soc. China 20, 465–470 (2010)
E. Samuel, B. Golbahar, A.M. Samuel, H.W. Doty, S. Valtierra, F.H. Samuel, Effect of grain refiner on the tensile and impact properties of Al–Si–Mg cast alloys. Mater. Des. 56, 468–479 (2014)
P.N. Crepeau, Effect of iron in Al–Si casting alloys: a critical review. AFS Trans. 110, 361–366 (1995)
A.M. Nabawy, A.M. Samuel, F.H. Samuel, H.W. Doty, Effects of grain refiner additions (Zr, Ti-B) and of mould variables on hot tearing susceptibility of recently developed Al-2 wt%Cu alloy. Int. J. Cast Met. Res. 26(5), 308–317 (2013)
A.M. Nabawy, A.M. Samuel, F.H. Samuel, H.W. Doty, Influence of additions of Zr, Ti-B, Sr, and Si as well as of mold temperature on the hot-tearing susceptibility of an experimental Al-2%Cu-1%Si alloy. J. Mater. Sci. 47(9), 4146–4158 (2012)
S.G. Irizalp, N. Saklakoglu, Effect of Fe-rich intermetallics on the microstructure and mechanical properties of thixoformed A380 aluminum alloy. Int. J. Eng. Sci. Technol. 17, 58–62 (2014)
G. Pucella, A.M. Samuel, F.H. Samuel, H.W. Doty, S. Valtierra, American Foundry Society, Sludge formation in Sr-modified Al-11.5 Wt% Si diecasting alloys, in Proceedings of the One Hundred Third Annual Meeting, March 13–16, 1999 (American Foundrymen’s Society, 1999), pp. 117–125
M. Nabawy, A.M. Samuel, F.H. Samuel, H.W. Doty, Investigation of chemical additives on the microstructure and tensile properties of Al-2wt%Cu based alloys, in Transactions of the American Foundry Society, vol. 119; 115th Metalcasting Congress, April 5–8, 2011, Schaumburg, IL (American Foundry Society, Schaumburg, IL, 2011), pp. 124–139
M.F. Ibrahim, E. Samuel, A.M. Samuel, A.M.A. Al-Ahmari, F.H. Samuel, Metallurgical parameters controlling the microstructure and hardness of Al–Si–Cu–Mg base alloys. Mater. Des. 32(4), 2130–2142 (2011)
Y. Han, A.M. Samuel, H.W. Doty, S. Valtierra, F.H. Samuel, Optimizing the tensile properties of Al–Si–Cu–Mg 319-type alloys: role of solution heat treatment. Mater. Des. 58, 426–438 (2014)
S.G. Shabestari, The effect of iron and manganese on the formation of intermetallic compounds in aluminum–silicon alloys. Mater. Sci. Eng., A 38, 289–298 (2004)
M. Voncina, A. Smolet, J. Medved, P. Mrvar, R. Barbic, Determination of precipitation sequence in Al-alloys using DSC method. Mater. Geoenviron. 57, 295–304 (2010)
D.G. Eskin, Decomposition of supersaturated solid solution in Al–Cu–Mg–Si alloys. J. Mater. Sci. 38, 279–290 (2003)
L. Reich, M. Murayama, K. Hono, Evolution of Ω phase in an Al–Cu–Mg–Ag alloy-A three-dimensional atom probe study. Acta Mater. 46, 6053–6062 (1998)
J.M. Rosalie, L. Bourgeois, θ′ silver segregation to(Al2Cu)-Al interfaces in Al–Cu–Ag alloys. Philos. Mag. 89, 2195–2211 (2009)
A. Garg, Y.C. Chang, J.M. Howe, Precipitation of the Omega phase in an Al-4.0% Cu-0.5%Mg alloy. Scr. Metall. Mater. 24, 677–680 (1990)
E.M. Elgallad, Effect of Additives on the Mechanical Properties and Machinability of a New Aluminum-Copper Base Alloy, Ph.D. Thesis, UQAC, Quebec, Canada (2010)
H. Liao, Y. Sun, G. Sun, Effect of Al-5Ti-1B on the microstructure of near-eutectic Al-13%Si alloys modified with Sr. J. Mater. Sci. 37, 3489–3495 (2002)
C.L. Chen, A. Richter, R.C. Thomson, Mechanical properties of intermetallic phases in multi-component Al–Si alloys using nano-indentation. Intermetallics 17, 634–641 (2009)
K. Yu, W. Li, S. Li, J. Zhao, Mechanical properties and microstructure of aluminum alloy 2618 with Al3(Sc, Zr) phases. Mater. Sci. Eng., A 368, 88–93 (2004)
S. Qzbilen, H.M. Flower, Zirconium-vacancy binding and its influence on s’-precipitation in an Al–Cu–Mg alloy. Acta Metall. 37, 2993–3000 (1989)
R. Mahmudi, P. Sepehrband, H.M. Ghasemi, Improved properties of A319 aluminum casting alloy modified with Zr. Mater. Lett. 60, 2606–2610 (2006)
M. Drouzy, S. Jacob, M. Richard, Interpretation of tensile results by means of quality index and probable yield strength. AFS Int. Cast Metals J. 5, 43–50 (1980)
C.H. Cáceres, M. Makhlouf, D. Apelian, L. Wang, Quality index chart for different alloys and temperatures: a case study on aluminium die-casting alloys. J. Light Met. 1, 51–59 (2001)
J. Hernandez-Sandoval, G.H. Garza-Elizondo, A.M. Samuel, S. Valtiierra, F.H. Samuel, The ambient and high temperature deformation behavior of Al–Si–Cu–Mg alloy with minor Ti, Zr, Ni additions. Mater. Des. 58, 89–101 (2014)
A.M. Nabawy, Influence of Zr and Sc on the Microstructure, Tensile Properties and Hot-Tearing Susceptibility of Al-2 wt%Cu-Based Alloys, PhD Thesis, Université du Québec à Chicoutimi, Quebec, Canada (2010)
F.J. Tavitas-Medrano, A.M.A. Mohamed, J.E. Gruzleski, F.H. Samuel, H.W. Doty, Precipitation-hardening in cast Al–Si–Cu–Mg alloys. J. Mater. Sci. 45, 641–651 (2010)
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The authors would like to thank Amal Samuel for enhancing the image quality of the figures presented in this paper.
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Zaki, G.A., Samuel, A.M., Doty, H.W. et al. Effect of Metallurgical Parameters on the Performance of Al-2%Cu-Based Alloys. Inter Metalcast 11, 581–597 (2017). https://doi.org/10.1007/s40962-016-0113-8
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DOI: https://doi.org/10.1007/s40962-016-0113-8