Precipitation behavior and its effect on the dynamic recrystallization of a novel extruded Al-Cu-Li alloy

Wang, Kuizhao; Meng, Zijie; Cheng, Zinan; Chen, Liang; Zhao, Guizhe

doi:10.1016/j.matdes.2022.111135

Cited by 32 publications

(5 citation statements)

References 78 publications

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“…Careful observation of Figure 9 a–d shows that there are fine DRXed grains at the initial grain boundary (as shown by the yellow arrows). The formation of these DRXed grains is related to the original grain boundary bulging, which is a typical DDRX [ 39 ]. The number and size of fine DRXed grains at the initial grain boundaries gradually increase with the decrease in lnZ value.…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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

Liu

et al. 2023

Materials

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“…At the same time, the precipitation behavior is also affected during hot deformation. Wang et al have studied the dynamic precipitation behavior of Al-Cu-Li alloy at deformation temperatures of 300 • C and 400 • C and strain rates of 0.01 s −1 and 0.1 s −1 , finding that the precipitated phase will not affect the recrystallization mechanism but will significantly change the dynamic recrystallization fraction [15]. At the same time, it has been long believed that the coarse insoluble phases in Al-Cu-Li alloy can promote particle stimulated nucleation (PSN) and significantly increase the volume fraction of dynamic recrystallization and flow stress at low temperatures (<400 • C) [16].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Recrystallization Nucleation Mechanism and Precipitation Behavior of Homogeneous Al-Zn-Mg-Cu Alloy during Hot Deformation

Zhao,

Cao,

Fang

et al. 2024

Metals

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The hot deformation behavior of Al-Zn-Mg-Cu alloy was investigated by flow stress curves in isothermal hot compression experiments with deformation temperatures of 350–450 °C and strain rates of 0.01 s−1 to 1 s−1, and the constitutive equation of homogeneous alloy was obtained. At the same time, the dynamic recrystallization and precipitation behavior during hot deformation and the relationship between them and the Z parameters were studied by using EBSD and TEM. DRV is the main mechanism of dynamic softening. With the decrease in Z parameter, the softening mechanism changes from dynamic recovery to discontinuous dynamic recrystallization or continuous dynamic recrystallization. At a higher Z parameter, the dislocation density and precipitated phase density are also higher because the high dislocation density provides heterogeneous nucleation sites of the precipitated phase. A large number of precipitates in the alloy also inhibit the nucleation and growth of dynamic recrystallization by hindering dislocation movement and grain boundary migration.

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“…[ 36 ] In contrast, precipitates which became soft at 500 °C could be cut through by dislocations, making dislocations accumulated at the grain boundaries. [ 12 ] And due to the difference of dislocation density, grain boundaries might bow out to areas with high dislocation density, which promoted the occurrence of DDRX. The precipitation sequence for aged Al–Zn–Mg–Cu alloy was summarized as follows: Guinier–Preston zones→ η ′ → η (MgZn 2 ).…”

Section: Introductionmentioning

confidence: 99%

“…With the application of Al-Zn-Mg-Cu alloy more and more widely, the influence of processing parameters and service conditions on its microstructure and properties deserved more in-depth study, such as hot processing properties, multistage hot forging, extrusion, automobile crash, and the bird hit the fuselage or wings of the aircraft during flight. [12,13] Among them, thermal deformation has attracted extensive attention due to the following advantages: 1) lower deformation resistance and better workability were beneficial for processing; 2) relatively uniform and fine equiaxed grains were obtained compared with the original microstructure; 3) high temperature could enhance the atomic thermal movement ability and help to reduce the inhomogeneity of the chemical composition of ingots. [12,14] Therefore, a large amount of research has been conducted to analyze the thermal deformation behavior of aluminum alloys in the process of thermal deformation according to the true strain-stress diagrams.…”

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confidence: 99%

“…[12,13] Among them, thermal deformation has attracted extensive attention due to the following advantages: 1) lower deformation resistance and better workability were beneficial for processing; 2) relatively uniform and fine equiaxed grains were obtained compared with the original microstructure; 3) high temperature could enhance the atomic thermal movement ability and help to reduce the inhomogeneity of the chemical composition of ingots. [12,14] Therefore, a large amount of research has been conducted to analyze the thermal deformation behavior of aluminum alloys in the process of thermal deformation according to the true strain-stress diagrams. [15,16] Previous publications have shown that work hardening, dynamic softening, and dynamic precipitation (DPN) could coexist…”

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confidence: 99%

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The Dynamic Recrystallization in a Hot‐Compressed Al–Zn–Mg–Cu–Sc–Zr Alloy: The Role of Strain Rate

Zhao,

Huang,

Chen

et al. 2023

Adv Eng Mater

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The effects of strain rates (0.001–1 s−1) on the microstructures and mechanical performance of the novel Al–Zn–Mg–Cu alloy through hot compression at 300 °C are investigated in detail. With the increase of strain rate, the dislocation density increases from 0.06 × 1013 to 3.77 × 1013 m−2, which promotes the dynamic precipitation kinetics. And the volume fraction of η precipitates is calculated by the differential scanning calorimetry curves increasing from 1.36% to 3.94%. Both dislocations and precipitates promote to increase the hardness of the Al–Zn–Mg–Cu alloy. The large number of η precipitates in high‐strain‐rate samples hinders the recrystallization process by impeding the movement of dislocations and grain boundaries, decreasing the volume fraction of recrystallized grains to 3.1%. Continuous/discontinuous dynamic recrystallization occurs preferentially at low strain rates, and discontinuous dynamic recrystallization is rarely observed in high‐strain‐rate samples. In addition, because the process of continuous dynamic recrystallization promotes the transformation from low‐angle grain boundaries to high‐angle grain boundaries, more continuous dynamic recrystallized grains and less low‐angle grain boundaries can be observed in low‐strain‐rate samples.

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Precipitation behavior and its effect on the dynamic recrystallization of a novel extruded Al-Cu-Li alloy

Cited by 32 publications

References 78 publications

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

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

Dynamic Recrystallization Nucleation Mechanism and Precipitation Behavior of Homogeneous Al-Zn-Mg-Cu Alloy during Hot Deformation

The Dynamic Recrystallization in a Hot‐Compressed Al–Zn–Mg–Cu–Sc–Zr Alloy: The Role of Strain Rate

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