The high strength Al-Zn-Mg alloy is widely used for structure components in critical aerospace applications. Small additions of scandium (Sc) often refine cast microstructure and mechanical properties by forming metastable Al3Sc dispersoids. The main role of the Al3Sc dispersoid is to prevent recrystallization during hot deformation and solution treatment. A new technique to apply for surface modification of cast aluminium alloy is usually called friction stir processing (FSP) but basic principle follows by friction stir welding (FSW). The main aim of the present work is to discuss the recent advances in the area of FSPed fine grained aluminium alloy and to highlight the modern trends in research. Highlighting will be focus on the main strategies to increase strength of the fine grained aluminium alloy without loss of ductility, microstructure-property relationship and enhanced mechanical properties, as well as innovative potential of the fine grained aluminium alloys. It is experimentally proven that the higher Zn content (7.35 wt.%) with high Sc content (0.83 wt.%) alloy after FSPed enhanced as much as 0.2%PF 165.5 MPa, UTS 325.2 MPa and ductility 8.5 % respectively. Moreover, several characterizations has been done such as OM, XRD, TEM and fractographs analysis through EDAX and SEM analysis also revealed Al3Sc agglomeration after solution treatment and cavity formation due to Zn vaporization at high rotational speed and traverse speed of FSPed alloys. But mechanisms states that the combined effects of chemical properties, fine grained due to dynamic recrystallization, MgZn2 hardening precipitates and Al3Sc dispersoids of anti-recrystallization results. The several mechanical testing has been done such as hardness measurement along the stir zone, tensile properties and toughness. The aim has to enhance functional properties of aluminium alloy through new innovation technique of FSPed.
Al3Sc dispersoids, solution treatment, FSPed, FSW, fine grained, rotational speed and traverse speed, dynamic recrystallization, stir zone, toughness.
- Swati S Bobde1, Prof. D. N. Satange, “Biometrics in Secure e-Transaction” in International Journal of Emerging Trends & Technology in Computer Science, April-2013
- Dai, X-Y., Xia, C-q., Wu, A-r., Peng, X-m., (2007), Influence of Scandium on Microstructure and Mechanical Properties of Al-Zn-Mg-Cu-Zr Alloys, Materials Science Forum, Vols. 546-549, pp. 961-964.
- Wu, L-M., Seyring, M., Rettenmayr, M., Wang, W-H., (2010), Characterization of precipitate evolution in an artificially aged A-Zn-Mg-Sc-Zr alloy, Materials Science and Engineering A 527, 1068-1073.
- Valdez, S., Suarez, M., Fregoso, O.A., Juarez-Islas, J.A., (2012), Microhardness, Microstructure and Electrochemical Efficiency of an Al (Zn/xMg) Alloy after Thermal Treatment, Journal of Materials Science and Technology, 28(3), 255-260.
- Loffler, H., Kovacs, I., Lendvai, J., (1983), Review decomposition processes in Al-Zn-Mg alloys, Journal of Materials Science 18, 2215-2240.
- Juarez-Islas, J. A., (2005), Distribution and prediction of solute in Al-Zn-Mg alloys,” Materials Science & Engineering A 408, 303-308.
- Wolverton, C., (2001), Crystal structure and stability of complex precipitate phases in Al-Cu-Mg-(Si) and Al-Zn-Mg alloys, Acta. Mater. 49, 3129-3142.
- Costa, S., Puga, H., Barbosa, J., Pinto, A. M. P., (2012), The effect of Sc additions on the microstructure and age hardening behaviour of as cast Al-Sc alloys, Materials and Design 42, 347-352.
- Fernandez, P., Gonzalez, G., Alfonso, I., Figueroa, (2010), Hardness-Lattice Parameter Correlation for Aged Al-Zn-Mg Alloys, Journal of Materials Science and Technology, 26(12), 1083-1088.
- Kurt, A., Uygur, I., Cete, E., (2011), Surface modification of aluminium by friction stir processing, Journal of Materials Processing Technology 211, 313-317.
- Cavaliere, P., Squillace, A., (2005), High temperature deformation of friction stir processed 7075 aluminium alloy, Materials Characterization, 55, 136-142.
- Rhodes, C. G., Mahoney, M. W., Bingel, W. H., Calabrese, M., (2003), Fine-grain evolution in friction-stir processed 7050 aluminium, Scripta Materialia 48, 1451-1455.
- Fuller, B. F., Mahoney, M.W., Calabrese, M., Micona, L., (2010), Evolution of microstructure and mechanical properties in naturally aged 7050 and 7075 Al friction stir welds, Materials Science & Engineering A 527, 2233-2240.
- Zakharov V. V., (2003), EFFECT OF SCANDIUM ON THE STRUCTURE AND PROPERTIES OF ALUMINUM ALLOYS”, Metal Science and Heat Treatment, Vol. 45, Nos. 7-8, pp. 246-253.
- Surekha, K., Murty, B. S., Prasad Rao, K., (2008), Microstructural characterization and corrosion behaviour of multipass friction stir processed AA2219 aluminium alloy, Surface and Coatings Technology, 202, 4057-4068.
- Su, J-Q., Nelson, T. W., Sterling, C. J., (2005), Friction stir processing of large-area bulk UFG aluminium alloys, Scripta Materialia 52, 135-140.
- Kwon, Y.J., Saito, N., Shigematsu, I., (2002), Friction stir process as a new manufacturing technique of ultrafine grained aluminium alloy.
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||Volume 2 | Issue 1 | January-Febuary - 2016
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Cite This Article
P.K. Mandal , "Experimental Analysis of Microstructure and Mechanical Behaviour in Fine Grained Al-Zn-Mg Alloy", International Journal of Scientific Research in Science, Engineering and Technology(IJSRSET), Print ISSN : 2395-1990, Online ISSN : 2394-4099, Volume 2, Issue 1, pp.519-526, January-Febuary-2016.
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