Friction stir welding (FSW) of ME20M magnesium alloy without and with preheating in different temperatures is carried out. The thermal histories of different preheating temperatures are investigated; the microstructure and mechanical properties of the weld joints are studied. The results show that by increasing the preheating temperature, the peak temperature, the grain size as well as the precipitate size are increased, and the precipitation is reduced. After FSW, the preferred orientation of the
0001
crystal direction changes not to parallel but to normal direction, and the texture intensity improves. The microhardness and the tensile strength of the joints first increase and then decrease with the increase of the preheating temperature.
MisesRV.Mechanik der plastischen formänderung von Kristallen [Mechanics of the plastic deformation of crystals]. Z Ange Math Mech. 1928; 8(3):161–185. doi: 10.1002/zamm.19280080302
2.
LiX, QiW.Effect of initial texture on texture and microstructure evolution of ME20 Mg alloy subjected to hot rolling. Mater Sci Eng A. 2013; 560:321–331. doi: 10.1016/j.msea.2012.09.074
3.
ChinoY, KadoM, MabuchiM.Compressive deformation behavior at room temperature – 773K in Mg–0.2mass%(0.035at.%)Ce alloy. Acta Mater. 2008; 56(3):387–394. doi: 10.1016/j.actamat.2007.09.036
PoongkundranR, SenthilkumarK.Effect of preheating on microstructure and tensile properties of friction stir welded AA7075 aluminium alloy joints. Braz Arch Biol Technol. 2016; v.59:e161056.
6.
TangJM, ShenYF.Effects of preheating treatment on temperature distribution and material flow of aluminum alloy and steel friction stir welds. J Manuf Process. 2017; 29:29–40. doi: 10.1016/j.jmapro.2017.07.005
7.
VermaS, MisraJP, GuptaM.Effect of preheating and water-cooling on the wear properties of FS welded AA6082 joint. J Phys Conf Ser. 2019; 1240:012116. doi: 10.1088/1742-6596/1240/1/012116
8.
ZhangZ, ZhangHW.Numerical studies of preheating time effect on temperature and material behaviours in friction stir welding process. Sci Tech Weld Join. 2007; 12(5):436–448. doi: 10.1179/174329307X214386
9.
RobsonJD, HenryDT, DavisB.Particle effects on recrystallization in magnesium–manganese alloys: particle pinning. Mater Sci Eng A. 2011; 528(12):4239–4247. doi: 10.1016/j.msea.2011.02.030
10.
ShiG, ZhangD, ZhaoX, Precipitate evolution in Mg-6 wt%Zn-1 wt%Mn alloy. Rare Metal Mater Eng. 2013; 42(12):2447–2452. doi: 10.1016/S1875-5372(14)60036-9
11.
ChenY, ZhangRF, HeC, Effect of texture and banded structure on the crack initiation mechanism of a friction stir welded magnesium alloy joint in very high cycle fatigue regime. Int J Fatigue. 2020; 136:105617. doi: 10.1016/j.ijfatigue.2020.105617
12.
CerriE, GhioE.Effect of friction stir processing at high rotational speed on aging of a HPDC Mg9Al1Zn. Metals2020; 10:1014. doi: 10.3390/met10081014
13.
VermaS, GuptaM, MisraJP.Effect of preheating and water cooling on the performance of friction-stir-welded aviation-grade aluminum alloy joints. J Mater Eng Perform. 2019; 28:4209–4220. doi: 10.1007/s11665-019-04183-z
14.
GargA, BhattacharyaA.Friction stir spot welding of AA6061-T6 and Cu with preheating: strength and failure behavior at different test temperatures. Int J Adv Manuf Tech. 2020; 108:1613–1629. doi: 10.1007/s00170-020-05498-1
15.
YangC, WuCS, ShiL.Effect of ultrasonic vibration on dynamic recrystallization in friction stir welding. J Manuf Process. 2020; 56:87–95. doi: 10.1016/j.jmapro.2020.04.064
16.
ZhangJ, FengXS, GaoJS, Effects of welding parameters and post-heat treatment on mechanical properties of friction stir welded AA2195-T8 Al-Li alloy. J Mater Sci Tech. 2018; 34(1):219–227. doi: 10.1016/j.jmst.2017.11.033
0001
crystal direction changes not to parallel but to normal direction, and the texture intensity improves. The microhardness and the tensile strength of the joints first increase and then decrease with the increase of the preheating temperature.