On the microstructure and mechanical properties of similar and dissimilar AA7075 and AA2024 friction stir welding joints: Effect of rotational speed

Zhang, Chenghang; Huang, Guangjie; Cao, Yu; Zhu, Yulong; Liu, Qing

doi:10.1016/j.jmapro.2018.12.014

Cited by 61 publications

(35 citation statements)

References 41 publications

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“…The filling stud is a single-stage process where the stud is placed onto the prefabricated hole in the joint. Weld joint strength was increased with an increase in TRS which was studied and reported in dissimilar AA7075-AA2024 Al-alloy FSW joints [13].…”

Section: Introductionmentioning

confidence: 79%

Enhancement of Mechanical Properties on Novel Friction Stir Welded Al-Mg-Zn Alloy Joints Reinforced with Nano-SiC Particles

Natrayan

RavichandranM.²,

VeemanDhinakaran³

et al. 2021

Journal of Nanomaterials

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Friction stir welding (FSW) is a solid-state technique used to join Al-Zn-Mg alloys effectively compared with other conventional welding methods. Al-Zn-Mg alloy was processed for welding because they significantly demanded various engineering applications. A novel method of this research work is to characterize the unique mechanical properties of Al-Zn-Mg alloy reinforced with 1 to 3 wt% of nano silicon carbide (nano-SiC) particles developed by novel interlock friction-stir welding. The process parameters chosen for welding are rotational tool speed 1100 rpm, weld speed 25 mm/min, and triangular pin profile. The weld joint properties such as tensile strength, yield strength, and hardness were tested per ASTM standard. The microstructure of weld joints was studied with XRD and optical and scanning electron microscopy. The existence of silica particles in the weld joints and uniformed and homogeneous distribution of the particulates in the weld was verified by EDS analysis and microstructure. Al-Zn-Mg reinforced with nano-SiC joints has better static properties due to intensive softening in the stir region. Al-Zn-Mg with 3 wt% nano-SiC exhibits maximum tensile strength, yield strength, and nugget hardness of 191 MPa, 165 MPa, and 171 HV. Weld microstructures showed a pinning mechanism because nano-SiC particles were used as reinforcement during friction stir welding.

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Section: Introductionmentioning

confidence: 79%

Enhancement of Mechanical Properties on Novel Friction Stir Welded Al-Mg-Zn Alloy Joints Reinforced with Nano-SiC Particles

Natrayan

RavichandranM.²,

VeemanDhinakaran³

et al. 2021

Journal of Nanomaterials

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“…This suggests the creation of weak regions in the FSW weld joints that cause their premature failure (Fig. 7) [17]. Furthermore, it is noticed that, whatever the deviation tool value, fixing AA7075 alloy in AS reduces the mechanical properties of all the weld joints (maximum is 5.62%).…”

Section: Effect Of Tool Deviation and Materials Positioning On The Global Mechanical Properties Of The Dissimilar Fsw Jointsmentioning

confidence: 96%

“…In addition, the extent of the HAZ-2 (located on the AA2024 alloy side) increases when the AA2024 alloy is positioned in the AS. Furthermore, the width of the TMAZ is greater in the RS than it is in the AS because of the accumulation of the plastic deformation in the RS during friction welding [17]. Figure 3a-f illustrates the microstructures of the different zones in the 2AS_0mm specimen where different magnifications were used to better highlight the microstructure in each zone.…”

Section: Effect Of Tool Deviation and Materials Positioning On The Microstructure Of The Dissimilar Weld Jointsmentioning

confidence: 99%

“…In contrast to fusion welding, the low working temperature, experienced during the FSW process, leads to avoid some irreversible defects, such as hot cracking, which are responsible in most cases, on the deterioration of the mechanical properties of the weld joint [12]. The literature reports numerous research works dealing with the effect of FSW parameters, material positioning and tool geometry on microstructure and mechanical properties of the dissimilar FSW of AA2024 and AA7075 aluminum alloys [13][14][15][16][17][18]. H. Abd El-Hafez and A. El-Megharbel [19] pointed out that the welding parameters have a significant effect on mechanical and microstructural behavior of the AA2024 and AA7075 friction stir welds.…”

Section: Introductionmentioning

confidence: 99%

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Dissimilar FSW of AA2024 and AA7075: effect of materials positioning and tool deviation value on microstructure, global and local mechanical behavior

Hadji

Badji

Gaceb

et al. 2021

Int J Adv Manuf Technol

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In this work, the effect of material location and tool deviation on global and local mechanical behavior of dissimilar AA2024/ AA7075 friction stir weld joints was investigated. The results showed that increasing the tool deviation value up to 1 mm towards the soft material, fixed in the advancing side, improved the material mixing quality and enhanced the grain refinement in the stir zone. It was found that the highest ultimate tensile strength was obtained when the AA7075 alloy was fixed in the retreating side for 1-mm tool deviation towards the AA2024 alloy. Above this deviation value, a gradual decrease of the global mechanical properties of the weld joints was noticed. The digital image correlation (DIC) technique coupled to tensile testing revealed an improvement of local strain in the stir zone as well as the heat-affected zones of the dissimilar joints when the AA2024 alloy was positioned in the advancing side.

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“…According to their observation, some Zn, Mg, and Cu-rich θ and T phases were formed at the GBs on the AA7475 side of the SZ. Zhang et al [ 28 ] performed EBSD analyses of the FSW joints of AA2024-AA7075 and documented that the AA7475 side had higher residual stress and more intensive texture. With respect to the particle’s evolutions in AA2XXX-AA7XXX joints, it seems that AA7XXX is more prone to the nucleation and coarsening of precipitates during PWHT of such dissimilar joints.…”

Section: Introductionmentioning

confidence: 99%

Comparative Insight into the Interfacial Phase Evolutions during Solution Treatment of Dissimilar Friction Stir Welded AA2198-AA7475 and AA2198-AA6013 Aluminum Sheets

et al. 2021

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In the current research, dissimilar friction stir welded (FSW) sheets of AA2198-AA7475 and AA2198-AA6013 were solution treated at 460–580 °C for 1 h. Annealing at 580 °C led to complete degradation of both dissimilar weldments from the AA2198 side. According to the microstructure inspection, solution treatment triggered abnormal grain growth within the stir zone (SZ), and applying higher treatment temperatures enhanced the fraction of transformed grains. SEM analysis revealed that the pre-melting of grain boundaries (GBs) over 540 °C encouraged the diffusion of solute atoms to the GBs. The massive diffusion of Cu to the GBs led to the formation of Cu-rich eutectic phases in AA7475 and AA2198 and dense Cu-rich particles in AA6013. In the meantime, the diffusion of Mg and Zn to the GBs of AA7475 and Fe and Si to the GBs of AA6013 eventuated in the formation of coarse particles at the GBs which, in return, attenuated the bonding adhesion of the grains at SZ. The formation of remarkable Cu-rich phases in the pre-melted regions and significant contraction of the eutectic phase while cooling as well as the formation of particles at GBs resulted in intergranular failure of the joints from the AA2198 side of the SZ.

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On the microstructure and mechanical properties of similar and dissimilar AA7075 and AA2024 friction stir welding joints: Effect of rotational speed

Cited by 61 publications

References 41 publications

Enhancement of Mechanical Properties on Novel Friction Stir Welded Al-Mg-Zn Alloy Joints Reinforced with Nano-SiC Particles

Enhancement of Mechanical Properties on Novel Friction Stir Welded Al-Mg-Zn Alloy Joints Reinforced with Nano-SiC Particles

Dissimilar FSW of AA2024 and AA7075: effect of materials positioning and tool deviation value on microstructure, global and local mechanical behavior

Comparative Insight into the Interfacial Phase Evolutions during Solution Treatment of Dissimilar Friction Stir Welded AA2198-AA7475 and AA2198-AA6013 Aluminum Sheets

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