EFFECT OF Sr ADDITION ON THE MICROSTRUCTURE AND PROPERTIES OF THE A356 Al ALLOY
Keywords:
A356 Al alloy, Sr content, modification, purification, eutectic silicon
Abstract
An effective way of integrating purification and modification is used for casting the A356 Al alloy. Self-generated inclusion-eliminating flux exhibits excellent purification in the alloy with an inclusion-removal rate of 74 %. The grains of eutectic silicon are fine or vermicular, and diffusely distributed in the A356 Al alloy at a 0.012 w/% Sr addition. The mechanical properties of the alloy are significantly improved, including a tensile strength of 208.5 MPa and an elongation of 17.5 %. As the Sr addition is increased, the comprehensive properties of the material are not improved. The Sr addition can be reduced to a certain degree during the modification of the melt after high purification. The addition of 0.012 w/% Sr is most preferable in the alloy.
References
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21 T. Li, L. Guo, Z. Wang, Z. Guo, Separation of refined silicon from Al-Si alloys by air pressure filtration, Metallurgical and Materials Transactions B, 50 (2019), 1171–1179, doi:10.1007/s11663-019-¬01548-6
2 X. Y. Li, Y. L. Lu, J. Wang, D. S. Zhou, L. Yang, Effect of rare earth erbium on microstructure and mechanical properties of A356 aluminum alloy, Journal of Materials Engineering, 46 (2018) 1, 67–73, doi:10.11868/j.issn.1001-4381.2016.001066
3 G. V. S. Murthy, D. Patel, K. L. Sahoo, A study of Precipitation behavior of A356 alloy using ultrasonic velocity measurements, Insight – Non-Destructive Testing and Condition Monitoring, 16 (2016) 5, 703–711, doi:10.1784/insi.2016.58.7.367
4 Y. J. Zhang, N. H. Ma, X. F. Li, A New Technology to Improve the Elongation of A356 Alloy, Solid State Phenomena, 217–218 (2015), 450–454, doi:10.4028/www.scientific.net/SSP.217-218.450
5 M. J. Roy, D. M. Maijer, Experimental procedure for warm spinning of cast aluminum components, Journal of Visualized Experiments, 120 (2017), 1–8, doi:10.3791/55061
6 S. G. Shabestari, M. Divandari, M. H. Ghoncheh, Interplay among coating thickness, strip size, and thermal and solidification characteristics in A356 lost foam casting alloy, Metallurgical and Materials Transactions B, 48 (2017) 5, 2304–2315, doi:10.1007/s11663-¬017-¬1019-4
7 C. D. Lee, Effect of artificial ageing on the defect susceptibility of tensile properties to porosity variation in A356 aluminium alloys, International Journal of Metalcasting, 12 (2017) 3144, 321–330, doi:10.1007/s40962-017-0168-1
8 G. K. Mallarapu, P. K. Kancharla, J. B. Rao, Mechanical behaviour of A356 alloy reinforced with high strength alloy particulate metallic composites, Materials Research Express, 4 (2017) 8, 110–125, doi:10.1088/2053-1591/aa7e23
9 Q. Wang, Q. Hao, W. Yu, Effect of strontium modification on porosity formation in A356 alloy, International Journal of Metalcasting, 13 (2019), 944–952, doi:10.1007/s40962-018-00300-1
10 R. Tao, Y. Zhao, X. Kai, Y. Wang, The effects of Er addition on the microstructure and properties of an in situ nano ZrB 2-reinforced A356.2 composite, Journal of Alloys and Compounds, 731 (2017), 200–209, doi:10.1016/j.jallcom.2017.10.021
11 M. Khademian, A. Alizadeh, A. Abdollahi, Fabrication and characterization of hot rolled and hot extruded boron carbide (B4C) reinforced A356 aluminum alloy matrix composites produced by stir casting method, Transactions of the Indian Institute of Metals, 70 (2017), 1635–1646, doi:10.1007/s12666-016-0962-0
12 A. H. Ahmad, S. Naher, D. Brabazon, The effect of direct thermal method, temperature and time on microstructure of a cast aluminum alloy, Materials and Manufacturing Processes, 29 (2014) 2, 134–139, doi:10.1080/10426914.2013.822980
13 H. B. Nadendla, M. Nowak, L. Bolzoni, Grain refiner for Al-Si alloys, Light Metals, 64 (2016), 1009–1012, doi:10.1007/978-3-¬319-¬65136-1_170
14 T. H. Ludwig, P. L. Schaffer, L. Arnberg, Influence of vanadium on the microstructure of A356 foundry alloy, Light Metals, 64 (2016) 4–5, 1023–1028, doi:10.1002/9781118663189.ch173
15 T. Kimura, T. Nakamoto, Microstructures and mechanical properties of A356 (AlSi7Mg0.3) aluminum alloy fabricated by selective laser melting, Materials and Design, 89 (2015), 1294–1301, doi:10.1016/j.matdes.2015.10.065
16 D. S. Prasad, C. Shoba, K. R. Varma, A. Khurshid, Influence of wire EDM parameters on the damping behaviour of A356.2 aluminum alloy, Journal of Alloys and Compounds, 646 (2015), 257–263, doi:10.1016/j.jallcom.2015.06.050
17 W. Yan, G. Fu, G. Chen, L. Song, W. Liu, Texture characteristics of 1235 aluminum alloy after rolling, Mater. Tehnolo., 53 (2019) 6, 821–825, doi:10.17222/mit. 2018.195
18 W. Yan, G. Fu, H. Chen, Effect of inclusion-eliminating flux and the amount of flux on the purification of aluminum wheel hub, Materials Review, 26 (2012) 16, 117–119, doi: 10.1007/s11783-011-0280-z
19 A. Y. Shash, A. E. Ame, M. El-Saeed, Influence of Al2O3, nano-dispersions on mechanical and wear resistance properties of semisolid cast A356 Al alloy, Mechanical and Materials Engineering of Modern Structure and Component Design, 70 (2015), 13–24, doi:10.1007/978-3-319-19443-1_2
20 M. N. L. Masrur, A. S. Anasyida, H. Zuhailawati, Effect of grain refiner on microstructure of semi-solid A356 aluminum alloy, Advanced Materials Research, 1024 (2014), 251–254, doi:10.4028/ www.scientific.net/amr.1024.251
21 T. Li, L. Guo, Z. Wang, Z. Guo, Separation of refined silicon from Al-Si alloys by air pressure filtration, Metallurgical and Materials Transactions B, 50 (2019), 1171–1179, doi:10.1007/s11663-019-¬01548-6
Published
2021-06-02
How to Cite
1.
Yan W, Fu G, Xu Y, Lai W, Chen H. EFFECT OF Sr ADDITION ON THE MICROSTRUCTURE AND PROPERTIES OF THE A356 Al ALLOY. MatTech [Internet]. 2021Jun.2 [cited 2025Jan.19];55(3):443–448. Available from: https://mater-tehnol.si/index.php/MatTech/article/view/183
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