Influence of aluminium-rich intermetallics on microstructure evolution and mechanical properties of friction stir alloyed Al Fe alloy system

Sharma, Abhishek; Morisada, Yoshiaki; Fujii, Hidetoshi

doi:10.1016/j.jmapro.2021.05.073

Cited by 20 publications

(5 citation statements)

References 49 publications

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“…In P-FSW techniques, in addition to the dimensions of the tool, the width of this area depends on the tool offset in the first and second welding passes. As the tool offset increases, the overlap area of the first and second weld passes decreases and the width of the SZ increases [30,40,65,66]. Changing the direction of flow (advancing or retreating) and the surface of this region directly leads to changes in the microstructural patterns and mechanical properties of the welding joint.…”

Section: Surface Morphology and Macrographs Of Welding Specimensmentioning

confidence: 99%

“…The most important disadvantage of the linear FSW process is the lack of symmetry on either side of the weld [25][26][27][28]. If the asymmetry in the temperature distribution and material flow in the FSW process can be eliminated and the process turns into a relatively symmetrical process, the mechanical quality of the joint can be improved [29][30][31]. Different solutions have been suggested to eliminate this disadvantage, which includes the use of Reverse Dual-Rotation Friction Stir Welding (RDR-FSW) [32,33], implementation of the FSW process using tandem tools, using Multi-Pass Friction Welding (MP-FSW) [34][35][36] with reverse rotation of the tool and the use of Parallel-Friction Stir Welding (P-FSW) [37].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Mechanical and Microstructural Properties of Welded Specimens of AA6061-T6 Alloy with Friction Stir Welding and Parallel-Friction Stir Welding Methods

et al. 2021

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The present study investigates the effect of two parameters of process type and tool offset on tensile, microhardness, and microstructure properties of AA6061-T6 aluminum alloy joints. Three methods of Friction Stir Welding (FSW), Advancing Parallel-Friction Stir Welding (AP-FSW), and Retreating Parallel-Friction Stir Welding (RP-FSW) were used. In addition, four modes of 0.5, 1, 1.5, and 2 mm of tool offset were used in two welding passes in AP-FSW and RP-FSW processes. Based on the results, it was found that the mechanical properties of welded specimens with AP-FSW and RP-FSW techniques experience significant increments compared to FSW specimens. The best mechanical and microstructural properties were observed in the samples welded by RP-FSW, AP-FSW, and FSW methods, respectively. Welded specimens with the RP-FSW technique had better mechanical properties than other specimens due to the concentration of material flow in the weld nugget and proper microstructure refinement. In both AP-FSW and RP-FSW processes, by increasing the tool offset to 1.5 mm, joint efficiency increased significantly. The highest weld strength was found for welded specimens by RP-FSW and AP-FSW processes with a 1.5 mm tool offset. The peak sample of the RP-FSW process (1.5 mm offset) had the closest mechanical properties to the base metal, in which the Yield Stress (YS), ultimate tensile strength (UTS), and elongation percentage (E%) were 76.4%, 86.5%, and 70% of base metal, respectively. In the welding area, RP-FSW specimens had smaller average grain size and higher hardness values than AP-FSW specimens.

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Section: Surface Morphology and Macrographs Of Welding Specimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Mechanical and Microstructural Properties of Welded Specimens of AA6061-T6 Alloy with Friction Stir Welding and Parallel-Friction Stir Welding Methods

et al. 2021

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“…The cooling rate of the HPDC process particularly in the die cavity, as shown in Figure 4, can reach up to ~100 K s −1 [22]. Hence, the solute concentrations of elements in α-Al solid solutions of die castings are usually higher than those of gravity castings [33]. Additionally, die castings have smaller grain sizes because of rapid solidification and more porosity because of melt turbulence and solidification order.…”

Section: Introductionmentioning

confidence: 99%

Research Progress on Thermal Conductivity of High-Pressure Die-Cast Aluminum Alloys

Liu,

Xiong

2024

Metals

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High-pressure die casting (HPDC) has been extensively used to manufacture aluminum alloy heat dissipation components in the fields of vehicles, electronics, and communication. With the increasing demand for HPDC heat dissipation components, the thermal conductivity of die-cast aluminum alloys is paid more attention. In this paper, a comprehensive review of the research progress on the thermal conductivity of HPDC aluminum alloys is provided. First of all, we introduce the general heat transport mechanism in aluminum alloys, including electrical transport and phonon transport. Secondly, we summarize several common die-cast aluminum alloy systems utilized for heat dissipation components, such as an Al–Si alloy system and silicon-free aluminum alloy systems, along with the corresponding composition optimizations for these alloy systems. Thirdly, the effect of processing parameters, which are significant for the HPDC process, on the thermal conductivity of HPDC aluminum alloys is discussed. Moreover, some heat treatment strategies for enhancing the thermal conductivity of die-cast aluminum alloys are briefly discussed. Apart from experimental findings, a range of theoretical models used to calculate the thermal conductivity of die-cast aluminum alloys are also summarized. This review aims to guide the development of new high-thermal-conductivity die-cast aluminum alloys.

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“…When the welding process is finished, the UFSW tool exits from the joint line. This step is the final stage of the joining process [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Underwater Friction Stir Welding Heat Generation on Residual Stress of AA6068-T6 Aluminum Alloy

et al. 2022

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This article aims to study water-cooling effects on residual stress friction stir welding (FSW) of AA6068-T6 aluminum alloy. For this reason, the FSW and submerged FSW processes are simulated by computational fluid dynamic (CFD) method to study heat generation. The increment hole drilling technique was used to measure the residual stress of welded samples. The simulation results show that materials softening during the FSW process are more than submerged. This phenomenon caused the residual stress of the joint line in the submerged case to be lower than in the regular FSW joint. On the other hand, the results revealed that the maximum residual stresses in both cases are below the yielding strength of the AA6068-T6 aluminum alloy. The results indicated that the residual stress along the longitudinal direction of the joint line is much larger than the transverse direction in both samples.

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Influence of aluminium-rich intermetallics on microstructure evolution and mechanical properties of friction stir alloyed Al Fe alloy system

Cited by 20 publications

References 49 publications

Investigation of Mechanical and Microstructural Properties of Welded Specimens of AA6061-T6 Alloy with Friction Stir Welding and Parallel-Friction Stir Welding Methods

Investigation of Mechanical and Microstructural Properties of Welded Specimens of AA6061-T6 Alloy with Friction Stir Welding and Parallel-Friction Stir Welding Methods

Research Progress on Thermal Conductivity of High-Pressure Die-Cast Aluminum Alloys

Effects of Underwater Friction Stir Welding Heat Generation on Residual Stress of AA6068-T6 Aluminum Alloy

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