Microstructure and nanomechanical behavior of friction stir welded joint of 7055 aluminum alloy

Wang, Wen; Yuan, Shengnan; Qiao, Ke; Wang, Kuaishe; Zhang, Shengyi; Peng, Pai; Zhang, Ting; Han, Pengcheng; Wu, Bing; Yang, Juan

doi:10.1016/j.jmapro.2020.11.016

Cited by 29 publications

(10 citation statements)

References 52 publications

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“…Figure 3 also shows that these equiaxed grains are partially surrounded by HAGBs and partially by LAGBs. The LAGBs were usually formed by the continuous dislocation accumulation and rearrangement during dynamic recovery (DRV) accompanying the deformation [ 42 , 43 ] and subdivided the original large elongated initially cold-rolled grains. The high density of intragranular LAGBs indicated that the DRX was insufficient.…”

Section: Resultsmentioning

confidence: 99%

Restirring and Reheating Effects on Microstructural Evolution of Al–Zn–Mg–Cu Alloy during Underwater Friction Stir Additive Manufacturing

Wei

et al. 2022

Materials

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Friction stir additive manufacturing (FSAM) can be potentially used for fabricating high-performance components owing to its advantages of solid-state processing. However, the inhomogeneous microstructures and mechanical properties of the build attributed to the complex process involving restirring and reheating deserve attention. This study is based on the previous research of the underwater FSAMed 7A04 aluminum alloy and adopts a quasi in situ experimental method, i.e., after each pass of the underwater FSAM, samples were taken from the build for microstructural observation to investigate the restirring and reheating effects on microstructural evolution during the underwater FSAM. Fine-grain microstructures were formed in the stir zone during the single-pass underwater FSAM. After restirring, the grain size at the bottom of the overlapping region decreased from 1.97 to 0.87 μm, the recrystallization degree reduced from 74.0% to 29.8%, and the initial random texture transformed into a strong shear texture composed of the C {110}<11¯0>. After reheating, static recrystallization occurred in the regions close to the new additive zones, increasing the grain size and recrystallization degree. This study not only revealed the microstructural evolution during the underwater FSAM but also provided a guideline for further optimization of the mechanical properties of the Al–Zn–Mg–Cu alloy build.

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Section: Resultsmentioning

confidence: 99%

Restirring and Reheating Effects on Microstructural Evolution of Al–Zn–Mg–Cu Alloy during Underwater Friction Stir Additive Manufacturing

Wei

et al. 2022

Materials

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“…However, as research on the topic has developed, welding technology has become a limiting factor in the application of these materials. When applying conventional welding to fine-grained materials, due to excessive heat input, the grain growth process loses its original characteristics [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of rapid cooling on the microstructure and properties of fine-grained 7075 aluminium alloy under friction stir welding

Luo

Yang

Quan

et al. 2022

Mater. Res. Express

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In this study, 7075 aluminium alloy plates with a fine-grained structure were produced by four-pass equal-channel angular pressing and subsequently joined at room temperature (297 K) using carbon dioxide (CO2)-assisted cooling friction stir welding. Electron backscatter diffraction, X-ray diffraction, Thermocouple measuring instrument,optical microscopy and microhardness testing were used to investigate the microstructural and mechanical characteristics of friction stir welded joints. The results indicated that the maximum temperatures of welded joints at room temperature and CO2 - assisted were 673 K and 568 K, macroscopic surfaces of the welded joints under CO2-assisted cooling were smoother than those created under room temperature; this was because the rapid cooling of liquid CO2 inhibited the growth of grains and, following dynamic recrystallisation, the grain size was finer (~2.9 μm). Compared with the fine-grained base material (BM), the proportion of large-angle grain boundaries in the stir zone region of the welded joints increased under both conditions, and the anisotropy was weakened. The precipitation hardening of the joints was obvious; the welded joints appeared to soften at room temperature, while the hardness of the joints was the same as that of the fine-grained BM under the CO2-assisted cooling condition.

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Section: Introductionmentioning

confidence: 99%

“…The process of FSW have been proved to be an effective joining method for almost all the alloys of aluminium (which could not be welded by employing conventional joining techniques) ranging from 7XXX alloy series to 2XXX series and several alloys of magnesium [23][24][25][26][27][28][29][30][31]. For example, FSW of 7 series Al alloy namely 7075-T6 Al alloy was carried out by Wen et al [25]. During that experimental attempt, he investigated the microstructural and nano-mechanical characterization of the fabricated 7075-T6 Al alloy joints by adopting the technique namely nano-indentation, and a correlation was framed between the micro-hardness and nano-hardness.…”

Section: Introductionmentioning

confidence: 99%

Impact of speed of traverse during joining of CDA101 plates by FSW process

Kumar¹,

Sevvel²

2022

Scientia Iranica

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An experimental investigation was carried out to comprehend the impact of speed of traverse of tool on tensile strength and micro-structural peculiarities of attained joints during friction stir welding of Cu alloy namely CDA 101 flat plates, with other parameters namely spinning speed of tool (1100 rpm) and downward force (6kN) being constant. A tool with cylindrical tapered pin geometry was made to traverse at distinctive speeds from 20 mm/min to 45 mm/min. It was observed that, the CDA 101 joints fabricated at 20 mm/min was found to be entirely free flaws, with joints fabricated at other speeds of tool traverse possessing several weld flaws. Grains in the center of the zone of stir of the joints obtained at 20 mm/min was uniformly distributed and homogeneous, due to the experience of the exemplary volume of frictional heat and sufficient amount of stirring force. Highest tensile strength of 200.65 MPa (nearly 85.38% of base metal)was exhibited by joint attained at 20 mm/min.

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Microstructure and nanomechanical behavior of friction stir welded joint of 7055 aluminum alloy

Cited by 29 publications

References 52 publications

Restirring and Reheating Effects on Microstructural Evolution of Al–Zn–Mg–Cu Alloy during Underwater Friction Stir Additive Manufacturing

Restirring and Reheating Effects on Microstructural Evolution of Al–Zn–Mg–Cu Alloy during Underwater Friction Stir Additive Manufacturing

Effect of rapid cooling on the microstructure and properties of fine-grained 7075 aluminium alloy under friction stir welding

Impact of speed of traverse during joining of CDA101 plates by FSW process

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