Abstract
Ultrasonic treatment is one of the most efficient and cost effective processes that are developing in today’s technology. It improves mechanical properties, corrosion resistance and homogeneity of the microstructure. In this study, the effect of casting conditions and ultrasonic treatment on the microstructure, hardness and corrosion behaviour of the Al-4.5%Mg alloy was investigated. Alloy ingots were melted in resistance furnace at 750C, and then cast into metallic molds. Pouring temperatures were 750C (superheated) and 639C (liquidus temperature). One sample was poured at 655C and left to solidify in ultrasonic field down to 615C within 2–3 minutes. The microstructure showed a completely coarse dendritic morphology for casting at 750C, and less dendritic morphology with finer grain size when cast at 639C. The finest and most globular aluminum grains and intermetallic particles were obtained by ultrasonic treatment during solidification. Higher hardness values and corrosion resistance were recorded for ultrasonic treated sample in comparison to cast one.
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References
W. Khalifa, Y. Tsunekawa, and M. Okumiya, “Ultrasonic grain refining effects in A356 Al-Si cast alloy,” AFS transactions, 2010, paper 10–020.
J. M. (Tim) Holt, Structural Alloys Handbook, 1996 edition, Technical Ed; C. Y. Ho, Ed., (CINDAS/Purdue University, West Lafayette, IN, 1996).
C. Limmaneevichitr, S. Pongananpanya, and J. Kajornchaiyakul, “Metallurgical structure of A356 aluminum alloy solidified under mechanical vibration: An investigation of alternative semi-solid casting routes,” Mater. Des., 30 (2009), 3925–3930.
A. Greer, “Grain Refinement of Aluminum Alloys. Proc. of Solidification of Aluminum Alloys,” M. Chu, D. Granger and Q. Han (Eds.), TMS, (2004), 131–145.
W. Khalifa, Y. Tsunekawa, M. Okumiya, “Effect of Ultrasonic Melt-Treatment on the Eutectic Silicon and Iron Intermetallic Phases in Al-Si cast Alloys,” Materials Science Forum, 638–642 (2010), 431–436.
W. Khalifa, Y. Tsunekawa, M. Okumiya, “Effect of Ultrasonic Treatment on Fe-intermetallic Phases in ADC12 Al-Si Die Cast Alloy,” Journal of Materials Processing Technology, 210 (2010), 2178–2187.
W. Khalifa, S. Elhadad, Y. Tsunekawa, “Microstructure and Wear Behavior of Solidification Sonoprocessed B390 Hypereutectic Al-Si Alloy,” Metallurgical and Materials Transactions, 44A (2013), 5817–24.
W. Khalifa, Y. Tsunekawa, M. Okumiya, “Effect of Reheating to the Semisolid State on the Microstructure of the A356 Aluminum Alloy Produced by Ultrasonic Melt-Treatment,” Solid State Phenomena, 141–143 (2008), 499–504.
W. Khalifa, S. Elhadad, Y. Tsunekawa, “Microstructure Evolution and Mechanical properties of Sonoprocessed-Thixocast AC4C Billets,” Proc The 71st World Foundry Congress, Bilbao, Spain, 2014.
W. Khalifa, Y. Tsunekawa, M. Okumiya, “Microstructure Characteristics and Tensile Property of Ultrasonic Treated-Thixocast A356 Alloy,” in press, the Transactions of Nonferrous Metals Society of China, manuscript no. TNMSC-2014–0546.R1, October-2015.
J.R. Davis, Corrosion of aluminium and aluminium alloys, (ASM International, 25–49 1999).
R. M. El Nashar, A. M. El-Aziz, W. Khalifa, N. T. Abd El Ghani, “Microstructure and corrosion behaviour of Al-Si alloy treated by high intensity ultrasonic vibrations,” Ochrona przed Korozją nr 2, (2012), 34–39.
L. Chiu, C.Tsai, K.Chen, C.Hu, H. Chang, “Effect of Coarse Second-Phase Particles on Galvanic Corrosion of Anodized 6061 Aluminum Alloy Coupled with C1100 Copper,” Int. J. Electrochem. Sci., 10 (2015), 6572–6585.
P. M. Aziz and H. P. Godard, “Pitting characteristics of aluminum-influence of magnesium and manganese,” Industrial & Engineering Chemistry, vol. 44, no. 8, (1952) 1791–1795.
H. Ezuber, A. El-Houd, F. El-Shawesh , “A study on the corrosion behavior of aluminum alloys in seawater,” Materials and Design 29 (2008), 801–805.
P. Beeley, Foundry Technology, (Butterworth-Heinemann, second edition 2001), 79.
I.G. Brodova, P.S. Popel, G.I. Eskin, Liquid metal processing: application to aluminium alloy production, in: J.N. Fridlyander, D.G. Eskin (Eds.), Advances in Metallic Alloys, Taylor & Francis, London, 2002.
Y. Yu, S. Kim, Y. Lee, J. Lee, “Phenomenological observation on mechanical and corrosion properties of thixoformed 357 alloys a composition with permanent mold cast 357 alloys,” Metal Mater Trans, 33, (2002) 1399–1412.
C. Park, S. Kim, Y. Kwon, Y. Lee, and J. Lee, “Mechanical and corrosion properties of rheocast and low-pressure cast A356 T6alloy,”MaterialsScience and Engineering A 391 (2005), 86–94
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El-Aziz, A.M., El-Hady, M.A., Khlifa, W. (2016). Effect of High Intensity Ultrasonic Treatment on the Microstructure, Corrosion and Mechanical Behaviour of AC7A Aluminum Alloy. In: Williams, E. (eds) Light Metals 2016. Springer, Cham. https://doi.org/10.1007/978-3-319-48251-4_121
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DOI: https://doi.org/10.1007/978-3-319-48251-4_121
Publisher Name: Springer, Cham
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