Effect of Rotational Speed on Wear Behavior and Mechanical Properties of Friction Stir Welded AA6061+15%Al2O3p Metal-Matrix Composite
الموضوعات :
Moslem Paidar
1
(Department of Materials Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran)
Mojtaba Jafarian
2
(Young researcher and elite club,
Science and Research Branch, Islamic Azad University, Tehran, Iran)
Mohsen Salehi
3
(Young Researcher and Elite Club,
Science and Research Branch, Islamic Azad University, Tehran, Iran)
Mohammad Saeed Khakpash
4
(Department of Materials Engineering,
South Tehran Branch, Islamic Azad University, Iran)
الکلمات المفتاحية: Metal matrix composite, wear resistance, Rotational Speed, Tensile strength, Friction Stir Welding,
ملخص المقالة :
The main objective of the present work was to investigate the effect of tool rotational speed on the mechanical and microstructural properties of aluminum based metal matrix composites (AA 6061 alloy reinforced with 15% of Al2O3 particles). The welds were produced by varying the rotational speed from 630 to 1250 r/min while the chosen welding speed was 80 mm/min for analysis. It was found from the analysis of the microstructure that the changing of the rotational speed leads to variation of the grain size and also the fragmentation and improvement of Al2O3 particles distribution in nugget zone. Moreover, the obtained results clearly depicted that increasing rotational speed from 630 to 1250 r/min resulted in improvement of the wear resistance and also decreases the fluctuations of friction coefficient which can be attributed to the presence of Al2O3 particles which acted as barriers and restricted the grain growth in nugget zone. The lowest wear rate was achieved at welds produced at rotational speed of 1250 r/min. It was seen from the hardness results that the highest tensile strength value was obtained for 1250 r/min rotational speed with an average value of about 320 MPa (equivalent to 82% that of the base metal).
[1] Salih, O. S., Ou, H., Sun, W., and McCartney, D. G., “A Review of Friction Stir Welding of Aluminium Matrix Composites”, Materials and Design, Vol. 86, 2015, pp. 61–71.
[2] Marzoli, L. M., Strombeck, A. V., Dos Santos, J. F., Gambaro, C., and Volpone, L. M., “Friction Stir Welding of an AA6061/Al2O3/20p Reinforced Alloy”, Composites Science and Technology, Vol. 66, No. 2, 2006, pp. 363–371.
[3] Cavaliere, P., Cerri, E., Marzoli, L., and Dos Santos, J., “Friction Stir Welding of Ceramic Particle Reinforced Aluminium Based Metal Matrix Composites”, Applied Composite Materials Vol. 11, No. 4, 2004, pp. 247–258.
[4] Mohammadi pour, M., Khodabandeh, A., Mohammadi pour, S., and Paidar, M., “Microstructure and Mechanical Properties of Joints Welded by Friction-Stir Welding in Aluminum Alloy 7075-T6 Plates for Aerospace Application”, Rare Metals, 2016 (to be published).
[5] Paidar, M., Sadeghi, Frazad., Najafi, H., and Khodabandeh, A., “Effect of Pin and Shoulder Geometry on Stir Zone and Mechanical Properties of Friction Stir Spot-Welded Aluminum Alloy 2024-T3 Sheets”, Journal of Engineering Materials and Technology, Vol. 137, No. 3, 2015, pp. 031004- 031009.
[6] Feng, A. H., Xiao, B. L., and Ma, Z. Y., “Effect of Microstructural Evolution on Mechanical Properties of Friction Stir Welded AA2009/SiCp Composite”, Composites Science and Technology, Vol. 68, No. 9, 2008, pp. 2141–2148.
[7] Gopalakrishnan, S., Murugan, N., “Prediction of Tensile Strength of Friction Stir Welded Aluminium Matrix TiCp Particulate Reinforced Composite”, Materials and Design, Vol. 32, 2011, pp. 462–467.
[8] Aydın, H., Bayram, A., and Durgun, I., “The Effect of Post-Weld Heat Treatment on the Mechanical Properties of 2024-T4 Friction Stir-Welded Joints”, Materials and Design, Vol. 31, 2010, pp. 2568-2577.
[9] Asadi, P., Faraji, G., Masoumi, A, and Besharati Givi, M. K., “Experimental Investigation of Magnesium-Base Nano Composite Produced by Friction Stir Processing: Effects of Particle Types and Number of Friction Stir Processing Passes”, Metallurgical Materials Transactions A, Vol. 42, No. 9, 2011, pp. 2820-2832.
[10] Paidar, M., Laali Sarab, M., “Friction Stir Spot Welding of 2024-T3 Alumimum Alloy with SiC Nanoparticles”, Journal of Mechanical Science and Technology, Vol. 30, No. 1, 2016, pp. 365-370.
[11] Dolatkhah, A., Golbabaei, P., Besharati Givi, M. K., and Molaiekiya, F., “Investigating Effects of Process Parameters on Microstructural and Mechanical Properties of Al5052/SiC Metal Matrix Composite Fabricated Via Friction Stir Processing”, Materials and Design, Vol. 37, 2012, pp. 458–464.
[12] Srinivasu, R., Sambasiva Rao, A., Madhusudhan Reddy, G., and Srinivasa Rao, K., “Friction Stir Surfacing of Cast A356 Aluminiumesilicon Alloy with Boron Carbide and Molybdenum Disulphide Powders”, Defence Technology, Vol. 11, 2015, 140-146.
[13] Eftekharinia, H., Amadeh, A. A., Khodabandeh, A., and Paidar M., “Microstructure and Wear Behavior of AA6061/SiC Surface Composite Fabricated Via Friction Stir Processing with Different Pins and Passes”, Rare Metals, 2016 (to be published).
