Mechanical and microstructural behaviour of 2024–7075 aluminium alloy sheets joined by friction stir welding

Cavaliere, Pasquale; Nobile, R.; Panella, F.W.; Squillace, Antonino

doi:10.1016/j.ijmachtools.2005.07.010

Cited by 246 publications

(131 citation statements)

References 17 publications

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“…In FSW, a tool is embedded on a rotating probe that moves along the length of the plates to be welded and a nugget zone is produced by the interference between the welding tool and the workpieces during the stirring stage. Moreover, the TMAZ is generated by the friction between the tool shoulder and the top plate surface as well as the contact between the adjacent material and the edges of the tool [19]. water.…”

Section: Methodsmentioning

confidence: 99%

A Microstructural Evaluation of Friction Stir Welded 7075 Aluminum Rolled Plate Heat Treated to the Semi-Solid State

Chegeni

Kapranos

2018

Metals

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Two rolled plates of 7075 aluminum alloy were used as starting material. The plates were welded using a simultaneous double-sided friction stir welding (FSW) process. One way of obtaining feedstock materials for Semi-solid processing or thixoforming is via deformation routes followed by partial melting in the semi-solid state. As both the base plate materials and the friction weld area have undergone extensive deformation specimens were subjected to a post welding heat-treatment in the semi-solid range at a temperature of 628 • C, for 3 min in order to observe the induced microstructural changes. A comparison between the microstructural evolution and mechanical properties of friction stir welded plates was performed before and after the heat-treatment in the Base Metal (BM), the Heat Affected Zone (HAZ), the Thermomechanically Affected Zone (TMAZ) and the Nugget Zone (NZ) using optical microscopy, Scanning Electron microscopy (SEM) and Vickers hardness tests. The results revealed that an extremely fine-grained structure, obtained in the NZ after FSW, resulted in a rise of hardness from the BM to the NZ. Furthermore, post welding heat-treatment in the semi-solid state gave rise to a consistent morphology throughout the material which was similar to microstructures obtained by the thixoforming process. Moreover, a drop of hardness was observed after heat treatment in all regions as compared to that in the welded microstructure.

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Section: Methodsmentioning

confidence: 99%

A Microstructural Evaluation of Friction Stir Welded 7075 Aluminum Rolled Plate Heat Treated to the Semi-Solid State

Chegeni

Kapranos

2018

Metals

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“…During the last few years, FSW has been gaining acceptance and has found various applications in aerospace, automotive and naval industries. For example, high strength 2xxx and 7xxx series aluminium alloys can be easily joined using FSW, while these alloys are often considered very difficult to weld using conventional welding techniques [1,2]. In the aerospace industry, stronger and lighter friction stir welded joints are excellent candidates for replacing bonded and riveted joints in the manufacture of large fuselage and other components [3,4].…”

Section: Introductionmentioning

confidence: 99%

Laser ultrasonics for defect detection and residual stress measurement of friction stir welds

Lévesque

Dubourg

Blouin

2011

Nondestructive Testing and Evaluation

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“…The factors studied were welding speed, rotation speed, number of passes, distances between passes, and tool dimensions while no information about microstructures were studied. P. Cavaliere et al 15) investigated microstructure and mechanical properties of dissimilar FSW butt joints of 2024-T3 to 7075-T6 aluminum alloy plates of 2.5 mm thick. But no information about the effect of welding conditions on the properties was reported.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Friction Stir Welded Dissimilar Aluminum Joints of AA2024-T3 and AA7075-T6

Khodir

Shibayanagi

2007

Mater. Trans.

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Dissimilar aluminum alloys such as 2024-T3 and 7075-T6 plates 3 mm thickness were friction stir butt welded. The welding was carried out at a constant welding speed of 100 mm/min and rotation speeds of 400, 800, 1200, 1600 and 2000 min À1 . Effects of rotation speeds and fixed location of two alloys on microstructures especially the homogeneity of elemental distribution in the stir zone (SZ), hardness distributions, and tensile properties of the joints were investigated. The homogeneity of constituents of the two alloys in the SZ was analyzed by a scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectroscopy (EDS).At the lowest rotation speed of 400 min À1 there was no mixing of two alloys in the SZ and a border between them was observed regardless of the fixed location. Increase of rotation speed more than 400 min À1 brought about a mixed structure likewise onion ring with periodic change of equiaxed grain size and heterogeneous distribution of alloying elements in the SZ. At 2000 min À1 of rotation speed the SZ mainly composed of the material fixed on the advancing side. The hardness increased in the zones occupied by 2024-T3 Al alloy and fluctuations took place in the SZ due to the onion ring at the higher rotation speeds till 1600 min À1 . At 2000 min À1 of rotation speed the hardness of SZ mainly depend on the material fixed on the advancing side. Hardness minima was in the heat affected zone (HAZ) on the side of AA2024-T3 Al alloy and the values slightly increased as the rotation speed increased. In the case of transverse tensile test, defect-free joints were fractured at the HAZ on 2024-T3 side and a maximum tensile strength of the joints was achieved at 1200 min À1 of rotation speed when 2024-T3 Al alloy was located on the advancing side. On the other hand, the tensile properties of SZ in the longitudinal direction showed higher values when 7075 Al alloy was located on the advancing side.

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Mechanical and microstructural behaviour of 2024–7075 aluminium alloy sheets joined by friction stir welding

Cited by 246 publications

References 17 publications

A Microstructural Evaluation of Friction Stir Welded 7075 Aluminum Rolled Plate Heat Treated to the Semi-Solid State

A Microstructural Evaluation of Friction Stir Welded 7075 Aluminum Rolled Plate Heat Treated to the Semi-Solid State

Laser ultrasonics for defect detection and residual stress measurement of friction stir welds

Microstructure and Mechanical Properties of Friction Stir Welded Dissimilar Aluminum Joints of AA2024-T3 and AA7075-T6

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