Effect of rotation speed on microstructure and mechanical properties of bobbin tool friction stir welded AZ61 magnesium alloy

Zhou, Li; Li, G. H.; Zha, G. D.; Shu, Fengyuan; Liu, H. J.; Feng, Jia

doi:10.1080/13621718.2018.1432098

Cited by 38 publications

(10 citation statements)

References 20 publications

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“…At the initial stage in NZ, the grains bend and get elongated. Further, the highly elongated grains break due to increase in the strain, and this process continues until equiaxed grain is formed [36]. The refinement of grain in TMAZ is mainly influenced by the shoulder friction during FSW where the elongated and tilted grain is formed from top to bottom of AS and RS in TMAZ which is elliptical in shape (as shown in Fig.…”

Section: Microstructural Observationmentioning

confidence: 98%

Effect of traverse speed on microstructure and mechanical properties of friction-stir-welded third-generation Al–Li alloy

Kumar

Acharya

Sethi

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The aim of the study is to investigate the consequences of tool traverse speed on force and torque distribution of friction-stirwelded third-generation Al-Cu-Li alloy joints. The microstructure and corresponding mechanical properties of the joints are investigated on force and torque perspective. Thus, the contribution of the present work lies in establishing the relation between traverse speed and mechanical properties of the AA2050-T84 joint. Four welds have been considered at varying traverse speeds from 1 to 4 mm/s at constant tool rotational speed and tool tilt angle of 1400 rpm and 2°, respectively. A tool of H13 steel having a tapered screw-threaded pin profile was used. The investigation reveals that with the increase in traverse speed, longitudinal force (X-force), vertically downward force (Z-force) and spindle torque also increase. The grain size of the nugget zone reduces from 19.84 to 14.86 µm as traverse speed increases. It has been found that the mechanical strength of the joint increases as the traverse speed increases. The Vickers microhardness value increases from 115 HV 0.1 to 131 HV 0.1 in the nugget zone as traverse speed increases from 1 to 4 mm/s. The maximum tensile strength, % elongation and joint efficiency are 403.2 MPa, 7.2% and 75.5% for traverse speed of 4 mm/s. The tensile fracture samples are analyzed by scanning electron microscope and reveal ductile mode of fracture.

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Section: Microstructural Observationmentioning

confidence: 98%

Effect of traverse speed on microstructure and mechanical properties of friction-stir-welded third-generation Al–Li alloy

Kumar

Acharya

Sethi

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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show abstract

“…The requirement for groove, complex treatment prior to welding and residual stress and deformation of post-weld structure involved in the conventional welding method could also be limited. However, the presence of significant plunging force and rigid backing plate/anvil to react process loads makes it difficult for some complex-shaped structures to implement the friction stir welding process [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Influence of Welding Speed on Microstructure and Mechanical Properties of 5251 Aluminum Alloy Joints Fabricated by Self-Reacting Friction Stir Welding

et al. 2021

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In the present study, 8 mm-thick 5251 aluminum alloy was self-reacting friction stir welded (SRFSW) employing an optimized friction stir tool to analyze the effect of welding speed from 150 to 450 mm/min on the microstructure and mechanical properties at a constant rotation speed of 400 rpm. The results indicated that high-quality surface finish and defect-free joints were successfully obtained under suitable process parameters. The microhardness distribution profiles on the transverse section of joint exhibited a typical “W” pattern. The lowest hardness values located at the heat-affected zone (HAZ) and the width of the softened region decreased with increasing welding speed. The tensile strength significantly decreased due to the void defect, which showed mixed fracture characteristics induced by the decreasing welding speed. The average tensile strength and elongation achieved by the SRFSW process were 242.61 MPa and 8.3% with optimal welding conditions, and the fracture surface exhibited a typical toughness fracture mode.

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“…As investigated by Esmaily et al [7], an improved corrosion resistance in BT-FSWed joints was achieved as compared to FSWed joints. For lightweight manufacturing, Zhou et al [8] carried out the BT-FSW of AZ61 magnesium alloy and reported the correlation between mechanical properties and rotational speeds. At the same time, they found a typical region, namely band pattern, where the voids form easily.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Bonding Interface Characteristics and Mechanical Properties of Bobbin Tool Friction Stir Welded Dissimilar Aluminum Alloy Joints

Wen

Patel

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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This study focuses on the bonding interface characteristics and mechanical properties of the bobbin tool friction stir welded dissimilar AA6056 and AA2219 aluminum alloy joints using different welding speeds. Voids arise solely in the stir zone at the AA2219 side. A distinct boundary with limited material mixing develops at the middle section of the bonding interface, while excellent material mixing with an irregularly jagged pattern forms at the top and bottom sections of the bonding interface. Increasing the welding speed, the material mixing is rarely changed at the middle section in comparison with the bottom section. Furthermore, a small difference between Guinier-Preston dissolution and Q phase precipitation leads to rare change of hardness in the heat affected zone (HAZ) at the AA6056 side. The increased hardness of the HAZ at the AA2219 side is attributed to avoidance of the dissolution of θ″ phase precipitates. A maximum tensile strength of 181 MPa is obtained at 300 mm min −1 . Fractures occur at the AA6056 side near the top and bottom surfaces and at the bonding interface in the middle section of the joints. The regions close to the top and bottom surfaces of the joints show a better ductility.

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Effect of rotation speed on microstructure and mechanical properties of bobbin tool friction stir welded AZ61 magnesium alloy

Cited by 38 publications

References 20 publications

Effect of traverse speed on microstructure and mechanical properties of friction-stir-welded third-generation Al–Li alloy

Effect of traverse speed on microstructure and mechanical properties of friction-stir-welded third-generation Al–Li alloy

Influence of Welding Speed on Microstructure and Mechanical Properties of 5251 Aluminum Alloy Joints Fabricated by Self-Reacting Friction Stir Welding

Assessing the Bonding Interface Characteristics and Mechanical Properties of Bobbin Tool Friction Stir Welded Dissimilar Aluminum Alloy Joints

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