Numerical simulations of void growth in aluminum alloy AA5083 during elevated temperature deformation

Du, Ningning; Bower, Allan F.; Krajewski, Paul E.

doi:10.1016/j.msea.2010.04.010

Cited by 13 publications

(4 citation statements)

References 48 publications

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“…However, most of the constitutive equations that describe the material behaviour are empirical models, in which all the material constants were determined from macro-scale experiments only. More detailed constitutive models to account for damage or microstructure evolution [11] are therefore needed, by which it is possible to enable an appropriate description of the material behaviour during plastic flow [12]. A physical-based model is suggested to give a better description in some respects of coupling to intrinsic variables and different deformation mechanisms that can fix a large range of applications with temperature and strain rate dependence.…”

Section: Introductionmentioning

confidence: 99%

Finite element modelling of superplastic-like forming using a dislocation density-based model for AA5083

Liu

Edberg

Tan

et al. 2013

Modelling Simul. Mater. Sci. Eng.

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Superplastic-like forming is a newly improved sheet forming process that combines the mechanical pre-forming (also called hot drawing) with gas-driven blow forming (gas forming). Non-superplastic grade aluminium alloy 5083 (AA5083) was successfully formed using this process. In this paper, a physical-based material model with dislocation density and vacancy concentration as intrinsic foundations was employed. The model describes the overall flow stress evolution of AA5083 from ambient temperature up to 550 °C and strain rates from 10−4 up to 10−1 s−1. Experimental data in the form of stress–strain curves were used for the calibration of the model. The calibrated material model was implemented into simulation to model the macroscopic forming process. Hereby, finite element modelling (FEM) was used to estimate the optimum strain-rate forming path, and experiments were used to validate the model. In addition, the strain-rate controlled forming was conducted for the purpose of maintaining the gas forming with an average strain rate of 2 × 10−3 s−1. The predicted necking areas closely approximate the localized thinning observed in the part. Strain rate gradients as a result of geometric effects were considered to be the main reason accounting for thinning and plastic straining, which were demonstrated during hot drawing and gas forming by simulations.

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Section: Introductionmentioning

confidence: 99%

Finite element modelling of superplastic-like forming using a dislocation density-based model for AA5083

Liu

Edberg

Tan

et al. 2013

Modelling Simul. Mater. Sci. Eng.

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“…This implies that diffusion does not contribute to the cavitation behavior. According to Du et al's prediction [24], the fraction of void growth through SDC, GBS and grain boundary diffusion is roughly 0.65, 0.3 and 0.05, respectively. It is therefore reasonable to assume that GBS-controlled deformation occurring in a complementary manner may also cause some damage along grain boundaries.…”

Section: Overall Growth Behaviormentioning

confidence: 95%

Cavitation during high-temperature deformation in Al–Mg alloys

et al. 2013

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It has recently been revealed that high-density pre-existing hydrogen micro pores, formed during production processes, exhibit premature growth and coalescence under external loading at room temperature, thereby inducing ductile fracture. This process is incidentally supplemented by the well-established ductile fracture mechanism based on particle damage. It is reasonable to assume that the pre-existing hydrogen micro pores may also contribute to damage evolution at high temperatures. In the present study, synchrotron X-ray microtomography was applied to the in-situ observation of

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“…As the grain boundaries slide during deformation, space is created in the grain boundary and grain triple junction. These spaces appear as cavities with complex shapes as shown in Figure 11 [30,33]. For this reason, the cavities were observed at grain boundaries and grain triple junctions in the microstructure of the 400 °C and 0.001 s −1 condition.…”

Section: Cavitiesmentioning

confidence: 99%

“…Through the etched microstructure image of the 400 • C and 0.001 s −1 condition shown in Figure 11, it can be seen that the cavities with complex shape were distributed at the grain boundary and grain triple junction. It is known that cavities arranged in a row are caused by the concentration of stress around particles lying along the rolling direction [29,30]. On the other hand, cavities with complex shape appeared due to a different reason.…”

Section: Metallurgical Evolutionmentioning

confidence: 99%

Stretch Forming Behavior and Constitutive Equation of a Modified 5083 Alloy with High Mg Content at Elevated Temperatures

Yang

Lee

Choi

et al. 2021

Metals

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For the purpose of applying a modified 5083 alloy (New 5083M alloy) with high Mg content in various automotive sheet parts, the stretch forming behavior of the 5083M alloy was studied in tensile mode at a wide range of processing conditions. The tensile tests were conducted by using a tensile test machine under the temperature ranges of 100–400 °C and the strain rate ranges of 0.001–1 s−1. The test results showed that the 5083M alloy has superior mechanical properties to that of the commercial 5083 alloy at elevated temperatures. The microstructure before and after the stretch forming was analyzed using optical microscope (OM) equipped with a polarizing filter and electron backscattered diffraction (EBSD) unit. Deformed microstructure was observed under low temperature conditions and dynamic recrystallized microstructure under high temperature conditions. However, regardless of microstructure evolution, developed deformation textures were distributed in orientation distribution functions (ODF) images. In addition, at high temperature and low strain rate condition, complex shaped cavities which were detrimental to mechanical properties appeared at the grain boundary and grain triple junction. Based on the test results data, a constitutive equation predicting the deformation behavior of the 5083M alloy was derived. The calculated curves by the constitutive equation were compared with the measured curves by experiment and agreed well.

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Numerical simulations of void growth in aluminum alloy AA5083 during elevated temperature deformation

Cited by 13 publications

References 48 publications

Finite element modelling of superplastic-like forming using a dislocation density-based model for AA5083

Finite element modelling of superplastic-like forming using a dislocation density-based model for AA5083

Cavitation during high-temperature deformation in Al–Mg alloys

Stretch Forming Behavior and Constitutive Equation of a Modified 5083 Alloy with High Mg Content at Elevated Temperatures

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