Comparative experiments of friction stir welding (FSW) of Al/Mg alloys were conducted with and without ultrasonic assistance. The copper powders were preset inside the workpieces as the marker material, and computer tomography technique was employed to obtain the three-dimensional information of material flow around the tool. The top view of copper powders distribution inside the weldments shows that the distribution zones of marker material at the retreating side and the trailing side were all widened by the exerted ultrasonic vibration (UV). The front view and side view of marker material distribution demonstrated that UV also enhanced the vertical material flow. Such detection results are helpful to elucidate the mechanism of ultrasonic-assisted FSW of dissimilar Al/Mg alloys.
ShahLH, OthmanNH, GerlichA.Review of research progress on aluminium-magnesium dissimilar friction stir welding. Sci Tech Weld Join. 2018; 23:256–270.
2.
SinghVP, PatelSK, RanjanA, Recent research progress in solid state friction-stir welding of aluminium–magnesium alloys: a critical review. J Mater Res Tech. 2020; 9(3):6217–6256.
3.
LiuL, RenD, LiuF.A review of dissimilar welding techniques for magnesium alloys to aluminium alloys. Materials (Basel). 2014; 7:3735–3757.
4.
LiuF, WangH, LiuL.Characterization of Mg/Al butt joints welded by gas tungsten arc filling with Zn–29.5Al–0.5Ti filler metal. Mater Character. 2014; 90:1–6.
5.
WangX, PanY, LoadosDA.Friction stir welding of dissimilar Al/Al and Al/non-Al alloys: a review. Metall Mater Trans B. 2018; 49(8):2097–2117.
6.
LvXQ, WuCS, PadhyGK.Diminishing intermetallic compound layer in ultrasonic vibration enhanced friction stir welding of aluminum alloy to magnesium alloy. Mater Lett. 2017; 203:81–84.
7.
ZhaoJ, WuCS, SuH.Ultrasonic effect on thickness variations of intermetallic compound layers in friction stir welding of aluminium/magnesium alloys. J Manufac Process. 2021; 62:388–402.
8.
MengX, JinY, JiS, Improving friction stir weldability of Al/Mg alloys via ultrasonically diminishing pin adhesion. J Mater Sci Technol. 2018; 34(10):1817–1812.
9.
ZhaoJ, WuCS, SuH.Acoustic effect on the tensile properties and metallurgical structures of dissimilar friction stir welding joints of Al/Mg alloys. J Manufac Process. 2021; 65:328–341.
10.
LvX, WuCS, YangC, Weld microstructure and mechanical properties in ultrasonic enhanced friction stir welding of Al alloy to Mg alloy. J Mater Process Technol. 2018; 254:145–157.
11.
SchmidtH, HattelJ.A local model for the thermomechanical conditions in friction stir welding. Model Simul Mater Sci Eng. 2005; 13(1):77–93.
12.
WangT. Experimental study on material flow during friction stir welding of dissimilar Al/Mg alloy [MS thesis]. Shandong University; 2021.
13.
XuSM, DengXM.A study of texture patterns in friction stir welds. Acta Mater. 2007; 56(6):1326–1341.
14.
SeidelTU, ReynoldsAP.Visualization of the material flow in AA2195 friction-stir welds using a marker insert technique. Metall Mater Trans A. 2001; 32(11):2879–2884.
15.
LiuXC, SunYF, NagiraT, Experimental evaluation of strain and strain rate during rapid cooling friction stir welding of pure copper. Sci Tech Weld Join. 2019; 24(4):352–359.
16.
EdwardsDP, RamuluM.Material flow during friction stir welding of Ti-6Al-4V. J Mater Proc Tech. 2015; 218:107–115.
17.
ZettlerR, LomolinoS, dos SantosJF, Effect of tool geometry and process parameters on material flow in FSW of an AA 2024-T351 alloy. Weld World. 2005; 49(3-4):41–46.
18.
LiuX, ZhaoS, ChenK, Material flow visualization of dissimilar friction stir welding process using nano-computed tomography. J Manufac Sci Eng. 2018; 140(11):111010.
19.
KarA, YadavD, SuwasS, Role of plastic deformation mechanisms during the microstructural evolution and intermetallics formation in dissimilar friction stir weld. Mater Character. 2020; 164:110371.
20.
WuCS, WangT, SuH.Material flow velocity, strain and strain rate in ultrasonic vibration enhanced friction stir welding of dissimilar Al/Mg alloys. J Manufac Process. 2022; 75:13–22.
21.
RusinkoA.Analytical description of ultrasonic hardening and softening. Ultrasonics. 2011; 51(6):709–714.
22.
YaoZH, KimGY, WangZH, Acoustic softening and residual hardening in aluminum: modeling and experiments. Int J Plasticity. 2012; 39:75–87.
23.
ShiL, WuCS, GaoS, Modified constitutive equation for use in modeling the ultrasonic vibration enhanced friction stir welding process. Scr Mater. 2016; 119:21–26.
24.
ZhaoWZ, WuCS.Constitutive equation including acoustic stress work and plastic strain for modeling ultrasonic vibration assisted friction stir welding process. Int J Mach Tool Manufac. 2019; 145:103434.
25.
WangX, WangC, LiuY, An energy based modeling for the acoustic softening effect on the Hall-Petch behavior of pour titanium in ultrasonic vibration assisted micro-tension. Int J Plasticity. 2021; 136:102879.
