Effect of TiO2 nanoparticles addition on microstructure and mechanical properties of dissimilar friction stir welded AA6063-T4 aluminum alloy and AZ31B-O magnesium alloy

Singh²,

Proceedings of the Institution of Mechanical Engineers, Part L:

2022

Magnesium (Mg) alloys have been extensively researched to widen their uses due to their outstanding particular features and the fact that they are one of the lightest metals. Mg alloys could be used in a variety of industries, including aircraft, shipbuilding, automobiles, railways, and many more. Mg alloy welding is recognized as one of the most difficult processes in a variety of industries. Because of its ability to generate a high-quality joint, friction stir welding (FSW) of Mg alloys has sparked a lot of research and industry interest. Heat treatment after welding is an effective way to improve the characteristics and performance of welded joints. Therefore, the FSW process was used to prepare Mg alloy weld joints and diverse heat treatment conditions were applied. The microstructure and mechanical properties of as-welded and heat-treated FSW butt-joints made of dissimilar AZ31 and AZ91 plates were studied. It was observed that holding times of 30 min and 60 min were prosperous in recrystallizing the grain and enhancing the microstructure of the weld zones. The holding time of the heat treatment cycle was found to smooth the microhardness profile in this order: 60 min>30 min>15 min. The post-weld heat treatment (PWHT) for 60 min has been found to improve both tensile strength and percentage elongation. Heat treatment enhanced the ductility of joints. As a result, the tensile failure mode was altered from brittle to ductile. PWHT joints had the highest impact energy of 4.2 J for 30 min, which was around 93% that of welded joints.

Section: Tensile Propertiesmentioning

confidence: 82%

The influence of holding time on the characteristics of friction stir welded dissimilar magnesium alloy joints during post welding heat treatment

Singh²,

Proceedings of the Institution of Mechanical Engineers, Part L:

2022

Science and Technology of Welding and Joining

“…The appearance and macrostructure of Al/Mg dissimilar FSW joints with different thicknesses of Ni foil interlayer under the conditions of 750 rev min −1 and 20 mm min −1 are shown in Figure 3. Compared to the Al side, the boundary between TMAZ and WNZ was obviously observed on the Mg side, which was related to placing the magnesium alloy on the AS [26]. In the WNZ, with the action of the shoulder, the matrix material on the AS was squeezed to the RS.…”

Section: Resultsmentioning

confidence: 99%

Effect of Ni interlayer on microstructure and mechanical properties of Al/Mg dissimilar friction stir welding joints

Dong

Lin

Zhu

et al. 2021

In this work, friction stir welding (FSW) was carried out for the flat butt welding tests of Al/Mg dissimilar alloys by introducing Ni foil interlayer with different thickness. The effect of the thickness of interlayer on microstructure and mechanical properties of the FSW joints was explored. The results revealed that with the increase of the thickness of Ni, the effective bearing area of the weld nugget zone (WNZ) increased. It achieved the maximum value when the thickness of interlayer was 0.3 mm, and a dense 'onion rings' structure which was composed of the cross distributions trips of magnesium alloy, aluminium alloy and the intermetallic compounds (IMCs), as well as the Ni particles of varying sizes were formed. Compared to the joint without introducing Ni, the introduction of Ni made the joints generate Mg 2 Ni and the Al 3 Mg 2 was partially replaced and led to the ultimate tensile strength (UTS) increased by 13.5%.

Materials Science and Technology

“…But the addition of the SiC nanoparticles has no effect on the formation of the IMCs and tensile strength of the joint. The SiC particles are only as reinforcement in FSW, the weld microstructure is influenced by the pinning mechanism [72]. In addition, TiO 2 nanoparticles are also used to produce sound Al/Mg butt joints, which employs the strengthening mechanism of nanoparticles to improve the mechanical properties of the joint.…”

Section: Addition Of the Interlayermentioning

confidence: 99%

Friction stir welding of aluminium to magnesium: A critical review

Mao

et al. 2022

Aluminium/magnesium hybrid structure has been paid increasing attention recently due to its excellent lightweight. However, aluminium/magnesium is easy to form pores, cracks, and massive intermetallic compounds when fusion welding is used. Friction stir welding is as solid-state method, which avoids the above-mentioned problems caused by fusion welding. This article systematically reviews recent progress in friction stir welding of aluminium/magnesium from temperature field, metal flow and weld composition. Moreover, the effects of control parameters on the temperature field, metal flow and weld composition are discussed objectively, respectively. Finally, this work puts forward some problems that need to be solved urgently in the future based on summarising the recent progress of friction stir welding of aluminium/magnesium.