Correlation between microstructure and microhardness in a friction stir welded 2024 aluminium alloy

Jones, Matthew; Heurtier, P.; Desrayaud, Christophe; Montheillet, F.; Allehaux, D.; Driver, J.H.

doi:10.1016/j.scriptamat.2004.12.027

Cited by 151 publications

(97 citation statements)

References 4 publications

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“…Also, increasing cooling rate after welding increases the amount of supersaturated solute which will be available for further precipitation reaction at room temperature. Although, there are some previous works [22][23][24] dealing with the behaviors of the hardening precipitates during welding thermal cycles for each alloy, additional TEM observation will be carried in the future specially in the SZ containing mixed structures of two alloys to investigate the behaviors of the hardening precipitates. Table 5 summarizes the tensile properties and fracture locations measured for dissimilar joints welded at different rotation speeds, together with two types of materials locations.…”

Section: Hardness Of Jointsmentioning

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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Section: Hardness Of Jointsmentioning

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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“…1, it was found to contain two distinct hardness minima on HAZ/TMAZ and TMAZ/WN. This is supposed to be the presence of precipitates in the TMAZ [9][10][11]. Moreover, some precipitates were dissolved (with higher hardness) or produced (with lower hardness), which leads to the phenomenon.…”

Section: Microhardness Distribution and Grain Sizementioning

confidence: 99%

“…The variation of microhardness in the stir zone is also associated with the kind and shape of precipitates [7,8]. Jones et al [9] analysed the correlation between microstructure and microhardness of FSW joint for AA2024-T351 aluminium alloy by using transmission electron microscopy (TEM). It was found that the very fine S precipitates existed between the thermo-mechanically affected zone (TMAZ) and heat-affected zone (HAZ).…”

Section: Introductionmentioning

confidence: 99%

Microstructure and precipitated phase in the thermo-mechanically affected zone of friction stir welded joint for 2024 aluminium alloy

Liu¹,

Liu²,

Yan³

et al. 2016

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The 2024 aluminium alloy sheets in the T4 temper were welded successfully by the friction stir welding techniques. The AlCuMg (U -phase) of metastable precipitates was found to exist in the thermo-mechanically affected zone using TEM analysis. Moreover, the U -phase is likely to induce the formation of two distinct microhardness minima in the stir zone of FSW weld. The AlCu3 and Cu2Mg particles were precipitated on the grain boundary of the thermomechanically affected zone and in the weld nugget region, respectively. K e y w o r d s : aluminium alloys, friction stir welding, microstructure, transmission electron microscopy

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“…Therefore, this solid-state process results in to minimal microstructural changes and better hardness and tensile tests than conventional welding [1][2][3]. The FSW process generates three distinct microstructural zones: the nugget zone (NZ), the thermomechanically affected zone (TMAZ) and the heataffected zone (HAZ) [4]. The HAZ is only affected by heat, without plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

Study on Impact of Microstructure and Hardness of Aluminium Alloy After Friction Stir Welding

Suresh¹

2017

IJAERS

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Correlation between microstructure and microhardness in a friction stir welded 2024 aluminium alloy

Cited by 151 publications

References 4 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

Microstructure and precipitated phase in the thermo-mechanically affected zone of friction stir welded joint for 2024 aluminium alloy

Study on Impact of Microstructure and Hardness of Aluminium Alloy After Friction Stir Welding

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