Investigation on material flow and microstructural evolution mechanism in non-thinning and penetrating friction stir welded Al–Cu aluminum alloy

Li, Dongrui; Liu, Huijie; Du, Shuaishuai; Li, Xuanmo; Gao, Yisong; Zuo, Yingying

doi:10.1016/j.msea.2022.144572

Cited by 12 publications

(3 citation statements)

References 34 publications

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“…The relative misorientation angles along L7 show that the misorientation angles of HAGBs perpendicular to the original grain boundary are 10–20°, which indicate that these HAGBs are transformed by LAGBs [ 23 , 27 ]. These characteristics are consistent with the typical GDRX phenomenon [ 40 , 41 , 42 , 43 ]. Therefore, GDRX is the main dynamic softening mechanism under the condition of lnZ ≤ 15.…”

Section: Resultssupporting

confidence: 86%

Hot Deformation Behavior and Dynamic Softening Mechanism in 7B50 Aluminum Alloy

Liu

et al. 2023

Materials

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The hot deformation behavior and dynamic softening mechanism of 7B50 aluminum alloy were studied via isothermal compression experiments in the range of 320–460 °C/0.001–1.0 s−1. According to the flow curves obtained from the experiments, the flow behavior of this alloy was analyzed, and the Zener–Hollomon (Z) parameter equation was established. The hot processing maps of this alloy were developed based on the dynamic material model, and the optimal hot working region was determined to be 410–460 °C/0.01–0.001 s−1. The electron backscattered diffraction (EBSD) microstructure analysis of the deformed sample shows that the dynamic softening mechanism and microstructure evolution strongly depend on the Z parameter. Meanwhile, a correlation between the dynamic softening mechanism and the lnZ value was established. Dynamic recovery (DRV) was the only softening mechanism during isothermal compression with lnZ ≥ 20. Discontinuous dynamic recrystallization (DDRX) becomes the dominant dynamic recrystallization (DRX) mechanism under deformation conditions of 15 < lnZ < 20. Meanwhile, the size and percentage of DDRXed grains increased with decreasing lnZ values. The geometric dynamic recrystallization (GDRX) mechanism and continuous dynamic recrystallization (CDRX) mechanism coexist under deformation conditions with lnZ ≤ 15.

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Section: Resultssupporting

confidence: 86%

Hot Deformation Behavior and Dynamic Softening Mechanism in 7B50 Aluminum Alloy

Liu

et al. 2023

Materials

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“…Almost all of the aluminum alloys can be joined using FSW. The FSW processes for pure aluminum [4], Al-Li [5,6], Al-Mg [7,8], Al-Mg-Si [9,10], Al-Cu [11,12], Al-Zn [13], and Al-Mn [14,15] aluminum alloys have been widely investigated.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Nonlinear Lap Joint of 6061 Aluminum Alloy by Friction Stir Welding

Qu,

Ma,

Xiao

et al. 2023

Metals

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The microstructure and properties of non-linear friction stir welded lap joints of the AA6061-T6 aluminum alloy were investigated, with a particular focus on the influence of corner curvature on the formability and mechanical properties of the joints. The research results indicate that for the 6061-T6 aluminum alloy lap joint friction stir welding with a smaller radius (R < 7 mm), there is a more severe accumulation of welding material. When the radius exceeds 7 mm, good macroscopic joint formation can be achieved. Various regions at the joint corners are composed of α-Al and intermetallic precipitations β phases. The microstructure of the heat-affected zone (HAZ) appeared relatively coarse, the weld nugget zone (WNZ) had the finest grain, and partial dissolution of the β phase occurred. The grain size in the middle WNZ at the corner was larger than at the ends, and the grain size on the inner side of the corner was larger than on the outer side. The hardness distribution of the joint exhibited a “W” shape, with the lowest hardness in the inner HAZ. When R ≤ 7, with an increase in R, the shear strength of the friction stir welded joints increased, and then the change became relatively small. The maximum shear strength of the joint was 101.32 ± 6.89 MPa at R = 7, and the fracture mode was primarily a ductile mixed fracture.

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“…Specifically, it typically consists of several stages and may involve several different microstructural mechanisms. Those include the geometric effect of strain [3][4][5], continuous recrystallization [6][7][8][9][10][11], or geometric recrystallization [3,[12][13][14][15]. Remarkably, the stir zone material may experience secondary deformation associated with the tool shoulder [16].…”

Section: Introductionmentioning

confidence: 99%

Grain Structure Evolution in 6013 Aluminum Alloy during High Heat-Input Friction-Stir Welding

Kalinenko,

Dolzhenko,

Malopheyev

et al. 2023

Materials

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This work was undertaken to evaluate the influence of friction-stir welding (FSW) under a high-heat input condition on microstructural evolution. Given the extreme combination of deformation conditions associated with such an FSW regime (including the highest strain, temperature, and strain rate), it was expected to result in an unusual structural response. For this investigation, a commercial 6013 aluminum alloy was used as a program material, and FSW was conducted at a relatively high spindle rate of 1100 rpm and an extremely low feed rate of 13 mm/min; moreover, a Ti-6Al-4V backing plate was employed to reduce heat loss during welding. It was found that the high-heat-input FSW resulted in the formation of a pronounced fine-grained layer at the upper weld surface. This observation was attributed to the stirring action exerted by the shoulder of the FSW tool. Another important issue was the retardation of continuous recrystallization. This interesting phenomenon was explained in terms of a competition between recrystallization and recovery at high temperatures. Specifically, the activation of recovery should reduce dislocation density and thus retard the development of deformation-induced boundaries.

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Investigation on material flow and microstructural evolution mechanism in non-thinning and penetrating friction stir welded Al–Cu aluminum alloy

Cited by 12 publications

References 34 publications

Hot Deformation Behavior and Dynamic Softening Mechanism in 7B50 Aluminum Alloy

Hot Deformation Behavior and Dynamic Softening Mechanism in 7B50 Aluminum Alloy

Microstructure and Properties of Nonlinear Lap Joint of 6061 Aluminum Alloy by Friction Stir Welding

Grain Structure Evolution in 6013 Aluminum Alloy during High Heat-Input Friction-Stir Welding

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