Abstract
The development of the microstructure and mechanical properties during friction stir welding of 6063-T4 aluminium alloy was investigated through electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) techniques and mechanical testing. Grain boundary and dislocation strengthening were observed to be the dominant strengthening mechanisms occurring in the stir zone (SZ). While the precipitates morphologies were sensitive to the weld zone temperatures, the grain size and grain boundary misorientations were related to strain (𝜖), strain rates (\(\dot {\epsilon }\)), and peak temperatures (T p ). Severe gradients in the crystallographic texture were observed at the top and bottom and on the retreating and advancing sides of the weld obtained at 48 mm/min welding speed. The optimal strength and ductility of a transverse tensile specimen were achieved when the cold defects, overaging in heat affected zones (HAZs), and grain size in stir zone (SZ) were minimized. While the yield strength of the longitudinal tensile specimens was controlled by the grain size, dislocation density and fraction of low angle boundaries (LABs), the uniform elongation was controlled by the fraction of high angle boundaries (HABs). In addition, a successful implementation of more simple geometry weld zone finite element model than earlier reported work for use in forming simulations was also proposed.
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Sevim I, Hayat F, Kaya Y, Kahraman N, Sahin S (2013) Study of MIG weldability of heat-treated aluminum alloys. Int J Adv Manuf Tech 66:1825–1834
Diot G, Koudri-David A, Walaszek H, Guegan S, Flifla J (2013) Non-destructive testing of porosity in laser welded aluminium alloy plates: laser ultrasound and frequency-bandwidth analysis. J Nond Eval 32:354–361
Rapp J, Glumann C, Dausinger F, Hogel H (1995) Laser welding of aluminium lightweight materials: problems, solutions, readiness for application. Opt Quan Elect 27:1203–1211
Mishra RS, Ma ZY (2005) Friction stir welding and processing. Mater Sci Eng R 50:1–78
Mistikoglu CG (2014) Recent developments in friction stir welding of Al-alloys. J Mater Eng Perform 23:1936–1953
Imam M, Ueji R, Fujii H (2016) Effect of online rapid cooling on microstructure and mechanical properties of friction stir welded medium carbon steel. J Mater Proc Tech 230:62–71
Nandan R, Debroy T, Bhadeshia HKDH (2008) Recent advances in friction-stir welding - process, weldment structure and properties. Prog. Mater Sci 53(6):980–1023
He X, Gu F, Ball A (2014) A review of numerical analysis of friction stir welding. Prog Mater Sci 65:1–65
Murayama M, Hono K (1999) Pre-precipitate clusters and precipitation process in Al-Mg-Si alloys. Acta Mater 47(5):1537–48
Heinz B, Skrotzki B (2002) Characterization of a friction-stir-welded aluminum alloy 6013. Metal Mater Trans B 33B:490–498
Simar A, Brechet Y, De Meester B, Denquin A, Gallais C, Pardoen T (2012) Integrated modeling of friction stir welding of 6XXX series Al alloys: process, microstructure and properties. Prog Mater Sci 57:95–183
Liu FC, MA ZY (2008) Influence of tool dimension and welding parameters on microstructure and mechanical properties of friction-stir-welded 6061-T651aluminium alloy. Metal Mater Trans A 39A:2378–2388
Imam M, Racherla V, Biswas K (2013) Effect of post-weld natural aging on mechanical and microstructural properties of friction stir welded 6063-T4 aluminium alloy. Mater Des 64:675–686
Scialpi A, De Filippis LAC, Cavaliere P (2007) Influence of shoulder geometry on microstructure and mechanical properties of friction stir welded 6082 aluminium alloy. Mater Des 28:1124–1129
Imam M, Racherla V, Biswas K (2015) Effect of backing plate material in friction stir butt and lap welding of 6063-T4 aluminium alloy. Int J Adv Manuf Tech 77(9):2181–2195
Vidal C, Infante V (2013) Optimization of FS welding parameters for improving mechanical behavior of AA2024-T351 joints based on taguchi method. J Mater Eng Perform 22(8):2261–2270
Imam M, Biswas K, Racherla V (2014) Effect of weld morphology on mechanical response and failure of friction stir welds in a naturally aged aluminium alloy. Mater Des 44:23–34
Rai R, De A, Bhadeshia HKDH, DebRoy T (2011) Review: friction stir welding tools. Sci Tech Weld Join 16(4):325– 342
Colegrove PA, Shercliff HR (2004) Development of Trivex friction stir welding tool Part 1-two-dimensional flow modelling and experimental validation. Sci Tech Weld Join 9(4):345–351
Fujii H, Cui L, Maeda M, Nogi K (2006) Effect of tool shape on mechanical properties and microstructure of friction stir welded aluminum alloys. Mater Sci Engg A 419:25–31
Elangovan K, Balasubramanian V (2008) Influences of tool pin profile and welding speed on the formation of friction stir processing zone in AA2219 aluminium alloy. J Mater Proc Tech 200(1-3):163–175
Cho H, Hong S, Roh J, Choi H, Kang SH, Steel RJ, Han HN (2013) Three-dimensional numerical and experimental investigation on friction stir welding processes of ferritic stainless steel. Act Mater 61:2649–2661
Seidel TU, Reynolds AP (2003) Two-dimensional friction stir welding process model based on fluid mechanics. Sci Tech Weld Join 8(3):175–183
Nandan R, Roy GG, Lienert TJ, Debroy T (2007) Three-dimensional heat and material flow during friction stir welding of mild steel. Act Mater 55:883–895
Arbegast WJ, Hartley PJ (1998) Proceedings of the fifth international conference on trends in welding research, Pine Mountain, GA, USA, p 541
Gholinia A, Humphreys FJ, Prangnell PB (2002) Production of ultra-fine grain microstructures in Al-Mg alloys by coventional rolling. Act Mater 50:4461–4476
Hassan Kh AA, Prangnell PB, Norman AF, Price DA, Williams SW (2003) Effect of welding parameters on nugget zone microstructure and properties in high strength aluminium alloy friction stir welds. Sci Tech Weld Join 8(4):257–268
Field DP, Nelson TW, Hovanski Y, Jata KV (2001) Heterogeneity of crystallographic texture in friction stir welds of Aluminum. Metal Mater Trans A 32a:2869–2877
Hjelen J, Orsund R, Nes E (1990) On the origin of recrystallization textures in Aluminium. Act Mater 39(7):1377–1404
Fonda RW, Bingert JF (2007) Texture variations in an aluminium friction stir weld. Scr Mater 57:1052–1055
Fonda RW, Bingert JF, Colligan KJ (2004) Development of grain structure during friction stir welding. Scr Mater 51:243–248
Fonda RW, Knipling KE (2011) Texture development in friction stir welds. Sci Tech Weld Join 16(4):288–294
Shen J, Wang F, Suhuddin UFH, Hu S, Li W, Santos JFD (2015) Crystallographic texture in bobbin tool friction stir welded aluminum. Metal Mater Trans A 46A:2809–2813
Fonda R, Reynolds A, Feng CR, Knipling K, Rowenhorst D (2013) Material flow in friction stir welds. Metal Mater Trans A 44A:337–344
Xu WF, Liu JH, Chen DL, Luan GH, Yao JS (2012) Improvements of strength and ductility in aluminium alloy via rapid cooling during friction stir welding. Mater Sci Eng A 548:89–98
Sato YS, Kokawa H, Ikeda K, Enomoto M, Jogan S, Hashimoto T (2001) Microstexture in the friction stir weld of an aluminum allo. Metal Mater Trans A 32A:941–948
Dutta I, Allen SM (1991) A calorimetric study of precipitation in commercial aluminium alloy 6061. J Mater Sci Lett 10:323–326
Woo W, Balogh L, Ungar T, Choo H, Feng Z (2008) Grain structure and dislocation density measurements in a friction-stir welded aluminum alloy using X-ray peak profile analysis. Mater Sci Engg A 498:308–13
Hansen N (2004) Hall-Petch relation and boundary strengthening. Scr Mater 51(8):801–806
Kamikawa N, Huang X, Tsuji N, Hansen N (2009) Strengthening mechanisms in nanostructured high-purity aluminium deformed to high strain and annealed. Act Mater 57:4198–4208
Ma ZY, Mishra RS, Mahoney MW (2002) Superplastic deformation behavior of friction stir processed 7075 Al alloy. Act Mater 50:4419–4430
Charit I, Mishra RS (2003) High strain rate superplasticity in a commercial 2024 Al alloy via friction stir processing. Mater Sci Engg A 359:290–296
Imam M, Biswas K, Racherla V (2013) On use of weld zone temperatures for online monitoring of weld quality in friction stir welding of naturally aged aluminium alloys. Mater Des 52:730–739
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Imam, M., Racherla, V., Biswas, K. et al. Microstructure-property relation and evolution in friction stir welding of naturally aged 6063 aluminium alloy. Int J Adv Manuf Technol 91, 1753–1769 (2017). https://doi.org/10.1007/s00170-016-9865-9
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DOI: https://doi.org/10.1007/s00170-016-9865-9