Effects of mechanical vibration on the physical, metallurgical and mechanical properties of cast A308 (LM21) aluminum alloy

Abstract

This study investigated the microstructure, physical, and mechanical properties of die-cast A308 alloy subjected to mechanical vibration during solidification. Different frequencies (0, 20, 30, 40, and 50 Hz) at constant amplitude (31 μm) were employed using a power amplifier as the power input device. X-ray diffraction, optical microscopy, and scanning electron microscopy were used to examine the morphological changes in the cast samples under stationary and vibratory conditions. Metallurgical features of the castings were evaluated using ImageJ software. The average values of metallurgical features, including primary α-Al grain size, dendrite arm spacing, average area of eutectic silicon, aspect ratio, and percentage porosity, reduced by 34%, 59%, 56%, 22%, and 62%, respectively, at 30 Hz frequency compared with stationary casting. Mechanical tests of the cast samples showed that the yield strength (YS), ultimate tensile strength (UTS), percentage elongation (%EL), and microhardness (HV) increased by 8%, 13%, 17%, and 16%, respectively, at 30 Hz frequency compared with stationary casting. The fractured surface of the tensile specimens exhibited mixed-mode fracture behavior because of brittle facets, cleavage facets, ductile tearing, and dimple morphologies. The presence of small dimples showed that plastic deformation occurred before fracture.

Keywords

mechanical vibration / microstructures / microhardness / tensile strength / fractography

References

[1] Abu-Dheir N, Khraisheh M, Saito K, Male A. Silicon morphology modification in the eutectic Al-Si alloy using mechanical mold vibration. Mater. Sci. Eng. A, 2005, 393(1–2): 109.

[2] Kumar S, Tewari SP. Effect of mold oscillation on the metallurgical characterization and mechanical properties of A319 aluminum alloy casting. Int. J. Cast Met. Res., 2018, 31(1): 1.

[3] Ram SC, Chattopadhyay K, Chakrabarty I. High temperature tensile properties of centrifugally cast in situ Al-Mg₂Si functionally graded composites for automotive cylinder block liners. J. Alloys Compd., 2017, 724, 84.

[4] Omura N, Murakami Y, Li MJ, Tamura T, Miwa KJ, Furukawa H, Harada M. Effects of mechanical vibration on cooling rate and DAS of AC4C aluminum alloy gravity die castings. Mater. Trans., 2009, 50(11): 2604.

[5] Kumar R, Ansari MS, Mishra SS, Kumar A. Effect of mould vibration on microstructure and mechanical properties of casting during solidification. Int. J. Eng. Res. Technol., 2014, 3(4): 90.

[6] Hallem SMAE, Ghayad I, Eisaa M, Nassif N, Shoeib M, Soliman H. Effect of ultrasonic and mechanical vibration on the corrosion behavior of Mg-3Zn-0.8Ca biodegradable alloy. Int. J. Electrochem. Sci., 2014, 9(4): 2005..

[7] Lü S, Wu SS, Dai W, Lin C, An P. The indirect ultrasonic vibration process for rheo-squeeze casting of A356 aluminum alloy. J. Mater. Process. Technol., 2012, 212(6): 1281.

[8] Mizutani Y, Miwa KJ, Tamura T, Nakai Y, Otsuka Y. Grain refinement of tough pitch copper by electromagnetic vibrations during solidification. Mater. Trans., 2006, 47(7): 1793.

[9] Mater. Res. Express, 2019, 6(9)

[10] H. Kumar, R. Prasad, P. Kumar, S.P. Tewari, and J.K. Singh, Mechanical and tribological characterization of industrial wastes reinforced aluminum alloy composites fabricated via friction stir processing, J. Alloys Compd., 831(2020), art. No. 154832.

[11] Mater. Res. Express, 2019, 6(8)

[12] Rahimi B, Khosravi H, Haddad-Sabzevar M. Microstructural characteristics and mechanical properties of Al-2024 alloy processed via a rheocasting route. Int. J. Miner. Metall. Mater., 2015, 22(1): 59.

[13] Khosravi H, Akhlaghi F. Comparison of microstructure and wear resistance of A356-SiC_p composites processed via compocasting and vibrating cooling slope. Trans. Nonferrous Met. Soc. China, 2015, 25(8): 2490.

[14] Guan RG, Tie D. A review on grain refinement of aluminum alloys: Progresses, challenges and prospects. Acta Metall. Sinica Engl. Lett., 2017, 30(5): 409.

[15] Chirita G, Stefanescu I, Soares D, Silva FS. Influence of vibration on the solidification behaviour and tensile properties of an Al-18wt%Si alloy. Mater. Des., 2009, 30(5): 1575.

[16] Jiang WM, Chen X, Wang BJ, Fan ZT, Wu HB. Effects of vibration frequency on microstructure, mechanical properties, and fracture behavior of A356 aluminum alloy obtained by expendable pattern shell casting. Int. J. Adv. Manuf. Technol., 2016, 83(1–4): 167.

[17] Taghavi F, Saghafian H, Kharrazi YHK. Study on the ability of mechanical vibration for the production of thixotropic microstructure in A356 aluminum alloy. Mater. Des., 2009, 30(1): 115.

[18] Jiang WM, Fan ZT, Chen X, Wang BJ, Wu HB. Combined effects of mechanical vibration and wall thickness on microstructure and mechanical properties of A356 aluminum alloy produced by expendable pattern shell casting. Mater. Sci. Eng. A, 2014, 619, 228.

[19] Richards RS, Rostoker W. The influence of vibration on the solidification of an aluminum alloy. ASM-Trans, 1956, 48, 885.

[20] Kocatepe K. Effect of low frequency vibration on porosity of LM25 and LM6 alloys. Mater. Des., 2007, 28(6): 1767.

[21] Saghafian H, Hedjazi J, Kharrazi Y. Investigation on the Influence of Mechanical Vibration upon Segregation Phenomenon in 2024 Wrought Aluminum Alloy, 1990, Tehran, Iran University of Science and Technology

[22] Campbell J. Effects of vibration during solidification. Int. Met. Rev., 1981, 26(1): 71.

[23] Kumar S, Tewari SP. Evaluation of microstructure of A356 aluminum alloy casting prepared under vibratory conditions during the solidification. Sādhanā, 2016, 41(10): 1203.

[24] Kumar S, Tewari SP. Metallurgical and mechanical characterization of A319 aluminum alloy casting solidified under mold oscillation. Int. J. Metalcast., 2018, 12(1): 28.

[25] Materials, 2017, 10(5)

[26] Fisher TP. Effects of vibrational energy on the solidification of aluminium alloys. Br. Foundryman, 1973, 66(3): 71.

[27] Patel VP, Patel JV, Patel AV, Bhuva BV. A review on microstructure and mechanical properties of aluminium alloy using mold vibration. Int. Res. J. Eng. Technol., 2019, 6(12): 1047.

[28] Deshpande J. The Effect of Mechanical Mold Vibrations on the Characteristics of Aluminum Casting Alloys, 2006, Worcester, Worcester Polytechnic Institute, 8.

[29] Jiang WM, Fan ZT, Dai YC, Li C. Effects of rare earth elements addition on microstructures, tensile properties and fractography of A357 alloy. Mater. Sci. Eng. A, 2014, 597, 237.

[30] Mehta MC, Mandal D, Chaudhury SK. Effects of amplitude of die vibration on cast structure of Al_4.5Cu alloy. Int. J. Metalcast., 2019, 13(2): 438.

[31] Lü S, Wu SS, Wan L, An P. Microstructure and tensile properties of wrought Al alloy 5052 produced by rheo-squeeze casting. Metall. Mater. Trans. A, 2013, 44, 2735.

[32] Zhao JW, Wu SS, Xie LZ, An P, Mao YW. Effects of vibration and grain refiner on microstructure of semisolid slurry of hypoeutectic Al-Si alloy. Trans. Nonferrous Met. Soc. China, 2008, 18(4): 842.

[33] Vivès C. Crystallization of aluminium alloys in the presence of cavitation phenomena induced by a vibrating electromagnetic pressure. J. Cryst. Growth, 1996, 158(1–2): 118.

[34] Nguyen H. The Effects of Solidification Rates on Porosity Formation and Cast Microstructure of Aluminum Alloy A356, 2005, Grand Rapids, Grand Valley State University, 1.

[35] Jian X, Xu H, Meek TT, Han Q. Effect of power ultrasound on solidification of aluminum A356 alloy. Mater. Lett., 2005, 59(2–3): 190.

[36] Abdul-Karem W, Green N, Al-Raheem KF. Vibration-assisted filling capability in thin wall investment casting. Int. J. Adv. Manuf. Technol., 2012, 61(9–12): 873.

[37] Li JQ, Fan ZT, Dong XP, Liu W, Li XY. Microstructure and mechanical properties of lost foam casting AZ91D alloy produced with mechanical vibration. Adv. Mater. Res., 2011, 213, 5.

[38] Rincón E, López HF, Cisneros MM, Mancha H, Cisneros MA. Effect of temperature on the tensile properties of an as-cast aluminum alloy A319. Mater. Sci. Eng. A, 2007, 452–453, 682.

[39] Limmaneevichitr C, Pongananpanya S, Kajornchaiyakul J. Metallurgical structure of A356 aluminum alloy solidified under mechanical vibration: An investigation of alternative semi-solid casting routes. Mater. Des., 2009, 30(9): 3925.