The joint properties of dissimilar formed Al alloys by friction stir welding according to the fixed location of materials

Lee, Wonbae; Yeon, Yun-Mo; Jung, Seung‐Boo

doi:10.1016/s1359-6462(03)00301-4

Cited by 167 publications

(101 citation statements)

References 5 publications

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“…Average grain size increases with increasing rotation speed. On the other hand, as represented by previous works on dissimilar friction stir welded joints, [19][20][21] the SZ zone had dynamically recrystallized fine structure with a periodic change of grain size which is clearly observed Fig. 5(c).…”

Section: Macrostructure Of Jointsmentioning

confidence: 50%

“…These differences in the compositions of Cu and Zn observed in the SZ suggested that the microstructure of the SZ mainly depend on the material fixed at the advancing side. In contrast, the microstructure of SZ in the dissimilar joints of A356 and AA6061 aluminum alloys 21) was reported to be affected mainly by the material fixed on the retreating side. This result indicates that the different combination of aluminum alloys causes different metal flows which in turn affect dominant structure in SZ.…”

Section: Eds Analysis Of Jointsmentioning

confidence: 92%

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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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Section: Macrostructure Of Jointsmentioning

confidence: 50%

Section: Eds Analysis Of Jointsmentioning

confidence: 92%

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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“…At the same time, there have been a number of experimental studies focusing on the material flow during FSW , particularly on the formation of weld nugget zones [1][2][3][4][5][6][7][8]. The upper weld zone is primarily the result of the interaction between the workpiece and the tool shoulder but the detailed forming mechanism is yet to be fully determined [71.…”

Section: Introductionmentioning

confidence: 99%

Material Flow and the Shear Layer in the Upper Weld Zone during Friction Stir Welding of Aluminium Alloys

Chen

Peris

Maginness

et al. 2006

Int. J. Soc. Mater. Eng. Resour

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Friction stir welding (FSW) experiments were conducted using three different aluminium alloys (a work hardened alloy, an age hardened alloy and a cast alloy) followed by metallographic examination focusing on the upper weld zone and the surface layer. The examination has revealed the features of the major forward flow resulting from the forward motion of the tool shoulder. A thin shear layer due to tool rotation was identified between the tool shoulder and the workpiece with a distinctive shear flow direction . The thickness of the shear layer was alloy dependent. An embedded layer in the upper weld zone has also been identified. The flow phenomena leading to this will be discussed. A velocity profile in the shear layer, based on the apparent alignment of Si particles in the cast alloy after welding, has suggested a dominant sliding contact condition.

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“…The main salient feature of FSW of dissimilar metals and alloys is thought to be the variation in asymmetry or the degree of symmetry with reference to the weld centerline [16]. For example, Lee et al evaluated the joint microstructure of the dissimilar welds between cast A356 and wrought 6051 aluminum alloys produced at various welding speeds [17]. Palanivel et al [18] studied the effect of the tool rotational speed and pin profile on the microstructure and tensile strength of dissimilar FSW between the AA5083-H111 and AA6351-T6 aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Dissimilar Friction Stir Welding between Ultrafine Grained 1050 and 6061-T6 Aluminum Alloys

Yangshan

Tsuji

Fujii

2016

Metals

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Abstract:The ultrafine grained (UFGed) 1050 Al plates with a thickness of 2 mm, which were produced by the accumulative roll bonding technique after five cycles, were friction stir butt welded to 2 mm thick 6061-T6 Al alloy plates at a different revolutionary pitch that varied from 0.5 to 1.25 mm/rev. In the stir zone, the initial nano-sized lamellar structure of the UFGed 1050 Al alloy plate transformed into an equiaxial grain structure with a larger average grain size due to the dynamic recrystallization and subsequent grain growth. However, an equiaxial grain structure with a much smaller grain size was simultaneously formed in the 6061 Al alloy plates, together with coarsening of the precipitates. Tensile tests of the welds obtained at different welding speeds revealed that two kinds of fracture modes occurred for the specimens depending on their revolutionary pitches. The maximum tensile strength was about 110 MPa and the fractures were all located in the stir zone close to the 1050 Al side.

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The joint properties of dissimilar formed Al alloys by friction stir welding according to the fixed location of materials

Cited by 167 publications

References 5 publications

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

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

Material Flow and the Shear Layer in the Upper Weld Zone during Friction Stir Welding of Aluminium Alloys

Microstructure and Mechanical Properties of Dissimilar Friction Stir Welding between Ultrafine Grained 1050 and 6061-T6 Aluminum Alloys

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