Effect of SiC and TiC nanoparticle reinforcement on the microstructure, microhardness, and tensile performance of AA6082-T6 friction stir welds
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During the last decade, friction stir welding has various applications in the automotive, shipbuilding, and aerospace industry due to its versatility. More recently, there have been trials to combine FSW with ceramic nanoparticle reinforcement in order to form MMCs locally on the weld line. This combination could result to potential applications on the above industries. In the present study, optical and electron microscopy, as well as microhardness and tensile testing, were used in order to determine the effect that SiC and TiC nanopowders have on the weld nugget of AA6082-T6 butt welds. It is the first time that such a thorough study via TEM in combination with EDS was conducted for this alloy. Emphasis was given on the distribution of dislocations and on the presence of the intermetallic and reinforcing particles in the weld. It was found that the grain size of all the specimens was dramatically decreased due to the dynamic recrystallization phenomenon. This also provoked the dilution of a lot of the intermetallic particles of the base metal and the multiplication of the dislocations. Between the two reinforced specimens, the SiC presented higher elongation while the TiC presented higher microhardness.
KeywordsFriction stir welding Dissimilar Reinforcing particle Microstructure Mechanical behavior Transmission electron microscopy
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The authors would like to thank the R-Nano Laboratory of the School of Chemical Engineering of the National Technical University of Athens for providing the SiC and TiC nanopowders.
- 1.Dawes CJ, Thomas WM (1996) Friction stir process welds aluminum alloys. Weld J 75(3):41–45Google Scholar
- 4.Orozco-Caballero A, Álvarez-Leal M, Hidalgo-Manrique P, Cepeda-Jiménez CM, Ruano OA, Carreño F (2017) Grain size versus microstructural stability in the high strain rate superplastic response of a severely friction stir processed al-Zn-mg-cu alloy. Mater Sci Eng A 680:329–337. https://doi.org/10.1016/j.msea.2016.10.113 CrossRefGoogle Scholar
- 6.Lynch SP, Edwards D, Majumdar A, Moutsos S, Mahoney M (2003) Friction stir processing of a high-damping Mn-cu alloy used for marine propellers. Mater Sci Forum 426–432(4):2903–2908. https://doi.org/10.4028/www.scientific.net/MSF.426-432.2903
- 10.Palanivel R, Dinaharan I, Laubscher RF, Paulo Davim J (2016) Influence of boron nitride nanoparticles on microstructure and wear behavior of AA6082/TiB2 hybrid aluminum composites synthesized by friction stir processing. Mater Des 106:195–204. https://doi.org/10.1016/j.matdes.2016.05.127 CrossRefGoogle Scholar
- 13.Bahrami M, Kazem Besharati Givi M, Dehghani K, Parvin N (2014) On the role of pin geometry in microstructure and mechanical properties of AA7075/SiC nano-composite fabricated by friction stir welding technique. Mater Des 53:519–527. https://doi.org/10.1016/j.matdes.2013.07.049 CrossRefGoogle Scholar
- 14.Dragatogiannis DA, Koumoulos EP, Kartsonakis I, Pantelis DI, Karakizis PN, Charitidis CA (2016) Dissimilar friction stir welding between 5083 and 6082 al alloys reinforced with TiC nanoparticles. Mater Manuf Process 31(16):2101–2114. https://doi.org/10.1080/10426914.2015.1103856 CrossRefGoogle Scholar
- 15.Pantelis DI, Karakizis PN, Daniolos NM, Charitidis CA, Koumoulos EP, Dragatogiannis DA (2016) Microstructural study and mechanical properties of dissimilar friction stir welded AA5083-H111 and AA6082-T6 reinforced with SiC nanoparticles. Mater Manuf Process 31(3):264–274. https://doi.org/10.1080/10426914.2015.1019095 CrossRefGoogle Scholar
- 18.Chen SJ, Lu AL, Yang DL, Lu S, Dong JH, Dong CL (2013) Analysis on flow pattern of bobbin tool friction stir welding for 6082 aluminum. Proceedings of the 1st International Joint Symposium on Joining and Welding, Osaka, 6–8 November 2013, pp 353–358Google Scholar
- 22.Selvakumar S, Dinaharan I, Palanivel R, Ganesh Babu B (2017) Characterization of molybdenum particles reinforced Al6082 aluminum matrix composites with improved ductility produced using friction stir processing. Mater Charact 125:13–22. https://doi.org/10.1016/j.matchar.2017.01.016 CrossRefGoogle Scholar
- 27.Humphreys FJ, Hatherly M (2004) Recrystallization and related annealing phenomena, 2nd edn. Elsevier, OxfordGoogle Scholar
- 28.Mrówka-Nowotnik G, Sieniawski J, Wierzbiñska M (2007) Intermetallic phase particles in 6082 aluminium alloy. Arch Mater Sci Eng 28(2):69–76Google Scholar
- 29.Mrówka-Nowotnik G (2007) Intermetallic phase identification on the cast and heat treated 6082 aluminium alloy. Microscopy - advanced tools for tomorrow's materials, BerlinGoogle Scholar
- 31.Vestfjell Jakobsen J (2016) Microstructure and mechanical properties of welded AA6082 Aluminium alloys. Norwegian University of Science and Technology Department of Materials Science and Engineering, TrondheimGoogle Scholar
- 35.Pouraliakbar H, Jandaghi MR, Khalaj G (2017) Constrained groove pressing and subsequent annealing of al-Mn-Si alloy: microstructure evolutions, crystallographic transformations, mechanical properties, electrical conductivity and corrosion resistance. Mater Des 124:34–46. https://doi.org/10.1016/j.matdes.2017.03.053 CrossRefGoogle Scholar