Microstructure Analysis on Friction Stir Welding of Magnesium Alloys

2019 ◽  
Vol 23 (4) ◽  
pp. 198-205
Author(s):  
Manikandan J ◽  
Surya Ramanjaneyulu D
Keyword(s):  
Friction Stir Welding ◽  
Magnesium Alloys ◽  
Microstructure Analysis ◽  
Friction Stir

Microstructural and Mechanical Behaviour Evaluation of Mg-Al-Zn Alloy Friction Stir Welded Joint

2020 ◽  
Vol 17 (3) ◽  
pp. 8150-8159
Author(s):  
Kulwant Singh ◽  
Gurbhinder Singh ◽  
Harmeet Singh
Keyword(s):  
Heat Treatment ◽  
Friction Stir Welding ◽  
Magnesium Alloys ◽  
Mechanical Performance ◽  
Fuel Efficiency ◽  
Research Work ◽  
Grain Structure ◽  
Tensile Fracture ◽  
Friction Stir ◽  
The Impact

The weight reduction concept is most effective to reduce the emissions of greenhouse gases from vehicles, which also improves fuel efficiency. Amongst lightweight materials, magnesium alloys are attractive to the automotive sector as a structural material. Welding feasibility of magnesium alloys acts as an influential role in its usage for lightweight prospects. Friction stir welding (FSW) is an appropriate technique as compared to other welding techniques to join magnesium alloys. Field of friction stir welding is emerging in the current scenario. The friction stir welding technique has been selected to weld AZ91 magnesium alloys in the current research work. The microstructure and mechanical characteristics of the produced FSW butt joints have been investigated. Further, the influence of post welding heat treatment (at 260 °C for 1 h) on these properties has also been examined. Post welding heat treatment (PWHT) resulted in the improvement of the grain structure of weld zones which affected the mechanical performance of the joints. After heat treatment, the tensile strength and elongation of the joint increased by 12.6 % and 31.9 % respectively. It is proven that after PWHT, the microhardness of the stir zone reduced and a comparatively smoothened microhardness profile of the FSW joint obtained. No considerable variation in the location of the tensile fracture was witnessed after PWHT. The results show that the impact toughness of the weld joints further decreases after post welding heat treatment.

Friction Stir Welding Magnesium Alloys

2013 ◽  
pp. 285-292 ◽  
Author(s):  
G. Kohn ◽  
S. Antonsson ◽  
A. Munitz
Keyword(s):  
Friction Stir Welding ◽  
Magnesium Alloys ◽  
Friction Stir

The next generation material for lightweight railway car body structures: Magnesium alloys

2016 ◽  
Vol 232 (1) ◽  
pp. 25-42 ◽  
Author(s):  
Woo Geun Lee ◽  
Jung-Seok Kim ◽  
Seung-Ju Sun ◽  
Jae-Yong Lim
Keyword(s):  
Friction Stir Welding ◽  
Magnesium Alloys ◽  
Structural Performance ◽  
Rolling Stock ◽  
Next Generation ◽  
Friction Stir ◽  
Car Body ◽  
Body Construction ◽  
Gradient Based ◽  
Low Stiffness

While magnesium alloys have the attractive attributes of low density, the application of the metal in transportation industries has been restricted by its low stiffness and strength. The aim of this study was to examine the possibility of lightweight railway car body construction using magnesium alloys from the structural and manufacturing perspectives. Extruded members, making up a car body, were designed employing a gradient-based optimization algorithm. And then, numerical simulations were conducted to confirm the structural performance of the newly designed car body. In addition, one of the designed members was extruded and joined with another via friction stir welding in order to verify its fabrication potential. The work demonstrated that, with just 85% of the weight of an aluminium car body currently in operation, a magnesium-based railway car body can be potentially constructed by extrusion followed by friction stir welding for the next generation rolling stocks; that is to say, the weight saving amount is 10% of the total bare frame weight, or 2% of its total rolling stock weight.

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