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

Liu, Peng; Liu, Guoliang; Yan, Dingyuan; Li, Jianing; Cainian, Jing; Feng, Kai

doi:10.4149/km_2016_5_363

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…The NZ experienced the dynamic recovery and dynamic recrystallization by a tool pin [11], and a fine equiaxed grain structure shown in this zone (see Fig. 2a).…”

Section: Microstructure Characterizationmentioning

confidence: 99%

Micro-nano structure and characterization in the nugget zone of Al-Cu-Mg alloy under friction stir processing

Sun¹,

Liu²,

Chen³

et al. 2020

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In this paper, the microstructure in the nugget zone of a friction-stir-processed Al-Cu-Mg alloy was analysed. There are the irregular bulk precipitates and micro-voids in the Al-Cu-Mg alloys. These precipitates were the compounds of Al-Cu system, and the size is less than 1 µm. In a local area, the homogeneous amorphous structure of Al-Cu system in some area of the nugget zone was also detected. The amorphous structure with a halo pattern has a structure characteristic of the long-range disorder. The formation of micro-nano and amorphous structure in the nugget zone could be attributed to the severe plastic deformation, breaking effect of stir tool, higher temperature gradient, hydrostatic pressure and shear stress and strain.

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“…The NZ experienced the dynamic recovery and dynamic recrystallization by a tool pin [11], and a fine equiaxed grain structure shown in this zone (see Fig. 2a).…”

Section: Microstructure Characterizationmentioning

confidence: 99%

Micro-nano structure and characterization in the nugget zone of Al-Cu-Mg alloy under friction stir processing

Sun¹,

Liu²,

Chen³

et al. 2020

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Investigation on the impact of parameters of FSW on microstructural transitions and the strength of CDA 101 joints

Yokesh Kumar,

Sevvel,

John Solomon

et al. 2024

Practical Metallography

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Abstact An experimental endeavor was made to fathom the influence of employed parameters on the microstructural transitions and tensile strength of friction stir welded (FSW) joints of CDA 101 Cu alloy. This investigation also aimed at providing insight into the interdependency between the mechanical properties and transformed microstructures. Flat plates of CDA 101 alloy were joined using the FSW process by employing four distinctive speeds of traverse and rotation. Employment of 1500 rpm in combination with 25 mm/min proved to be an exceptional combination, as the zone of nugget of this joint exhibited very fine sized, dynamically recrystallized, exquisite grain structures distributed consistently in equal spaces. A maximum tensile strength of 205.79 MPa was exhibited by this joint. It was confirmed that the employed speed of rotation of 1500 rpm was responsible for the generation of the ideal amount of frictional heat and the employed speed of traverse of 25 mm/min played a vital role in permitting the tool to traverse over the regions of the line of joint for a sufficient time period. Moreover, scanning electron microscopy fractography revealed that this joint exhibited smaller voids and has failed in a purely dimple mode of fracture, indicating the higher ductility of this joint.

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Determination of Process Parameters for Friction Stir Welded Dissimilar Aluminum Alloys: AA 5083 and AA 2024

Kasman

Ozan

2020

Practical Metallography

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In this study, dissimilar friction stir welding (FSW) processes were performed using Taguchi L9 orthogonal layout on AA 5083 H111 and AA 2024 T351 plates. The ultimate tensile strength (UTS) and percentage of elongation (∊t) were evaluated as the performance characteristics of the FS welded joints. A Taguchi based grey relational analysis was conducted using a grey relational grade (GRG) to obtain a welded joint with an optimal combination of high strength and ductility. Taking the largest mean value of GRG into consideration, the optimal welding combination was obtained using a tool with straight-threaded pin shape with the process parameters of 500 min−1 tool rotational speed (TRS) and 63 mm/min welding speed (WS). This combination was obtained from the experimental combinations in the Taguchi L9 orthogonal layout. Additionally, analysis of variance was performed to investigate the effect of parameters on GRG value and significance of the parameters. It was revealed that the effectiveness of each parameter was ranked: TRS (48.02%) > tool type (30.60%) > WS (21.12%). Tunnel and cavity-type defects were found to occur in the welded joints produced with the TRS of 630 and 800 min−1. Notably, the weakest welded joints were produced with the WS of 63 mm/min and 80 mm/min.

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

Cited by 3 publications

References 14 publications

Micro-nano structure and characterization in the nugget zone of Al-Cu-Mg alloy under friction stir processing

Micro-nano structure and characterization in the nugget zone of Al-Cu-Mg alloy under friction stir processing

Investigation on the impact of parameters of FSW on microstructural transitions and the strength of CDA 101 joints

Determination of Process Parameters for Friction Stir Welded Dissimilar Aluminum Alloys: AA 5083 and AA 2024

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