Flow behavior modeling of the 7050 aluminum alloy at elevated temperatures considering the compensation of strain

Li, Jiang; Li, Fuguo; Cai, Jun; Wang, Ruiting; Yuan, Zhanwei; Xue, Fei

doi:10.1016/j.matdes.2012.06.032

Cited by 93 publications

(39 citation statements)

References 40 publications

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“…Readers can refer to Reference [23][24][25] for more details about the identification process of material constants. The calculated n is roughly the same as that calculated in [26]. However, there are some deviations in other material constants.…”

Section: Constitutive Modelsupporting

confidence: 78%

“…However, there are some deviations in other material constants. The calculated Q is 172.078 KJ/mol for the alloy, which is higher than that of commercial purity aluminum (105-135 KJ/mol) [5], cast A356 aluminum alloy (152-172 KJ/mol) [27] and 7050 aluminum alloy (130-153 KJ/mol) [26]. These differences are mainly due to the different material states, the content of the material element and the computational errors.…”

Section: Constitutive Modelmentioning

confidence: 81%

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Application of the Constitutive Model in Finite Element Simulation: Predicting the Flow Behavior for 5754 Aluminum Alloy during Hot Working

Liu

2017

Metals

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Abstract:The flow behavior of 5754 aluminum alloy was researched using the plane strain compression test for the range of 300-500 • C and 0.1-10 s −1 . The experimental flow curves acquired directly from Gleeble-3500 show that deformation parameters have a significant effect on the flow curves. All curves show a broad peak due to the dynamic softening after the work hardening. In addition, the flow curves display a slight downward trend after reaching the peak stress at low and medium strain rates. This softening mechanism has been further investigated by the work hardening rate and the results show that the flow characteristics of 5754 aluminum alloy are mainly controlled by the mechanism of competition between hardening, dynamic recovery and continuous dynamic recrystallization. Based on the corrected true strain-stress curves, the constitutive model of the corresponding softening mechanism has been established by a linear regression method. Then, the developed model was embedded in the finite element (FE) analysis software (ABAQUS) by encoding the UHARD subroutine and the hot compression process of the alloy was simulated and analyzed. The simulation results show that the sample has an uneven flow in the deformation zone, which is consistent with the grain morphology of the corresponding region of the test sample. In addition, the simulated load-stroke values were well fitted to the experimental data. The predictive ability of the model was quantified by statistical indicators. It emerged that the FE of the embedded constitutive model effectively simulates the hot working process of 5754 aluminum alloy, which has reference value for actual processing.

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Section: Constitutive Modelsupporting

confidence: 78%

Section: Constitutive Modelmentioning

confidence: 81%

Application of the Constitutive Model in Finite Element Simulation: Predicting the Flow Behavior for 5754 Aluminum Alloy during Hot Working

Liu

2017

Metals

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“…In fact, strain has a significant influence on flow behaviors during hot working processing. Thus, a modified Arrhenius model considering the compensation of strain was proposed to predict the flow stress in 42CrMo steel [19], Ti-6242s [9], Ti-6Al-4V [20], Ti-6Al-7Nb [21], and 7050 aluminum alloy [22], etc.…”

Section: Introductionmentioning

confidence: 99%

Correction of Flow Curves and Constitutive Modelling of a Ti-6Al-4V Alloy

Dong

Zhang

et al. 2018

Metals

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Abstract:Isothermal uniaxial compressions of a Ti-6Al-4V alloy were carried out in the temperature range of 800-1050 • C and strain rate range of 0.001-1 s −1 . The effects of friction between the specimen and anvils as well as the increase in temperature caused by the high strain rate deformation were considered, and flow curves were corrected as a result. Constitutive models were discussed based on the corrected flow curves. The correlation coefficient and average absolute relative error for the strain compensated Arrhenius-type constitutive model are 0.986 and 9.168%, respectively, while the values for a modified Johnson-Cook constitutive model are 0.924 and 22.673%, respectively. Therefore, the strain compensated Arrhenius-type constitutive model has a better prediction capability than a modified Johnson-Cook constitutive model.

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“…At the early deformation stage, the flow stress increases rapidly with the increase of strain, which results from the work hardening caused by the dislocation generation and multiplication [33]. After a rapid increase, the flow stress begins to increase slowly until the Then, the flow stress tends to decline or maintain a steady state, illustrating a dynamic equilibrium between the work hardening and dynamic softening [34]. When the strain rate is 10/s (Fig.…”

Section: Hot Compression Testsmentioning

confidence: 97%

Numerical and experimental investigation on thermo-mechanical behavior during transient extrusion process of high-strength 7 × × × aluminum alloy profile

Yang

Wang

Zhao

et al. 2016

Int J Adv Manuf Technol

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Aluminum profile extrusion involves complex thermal, tribological, and mechanical interactions; thus, material flow and thermal behavior during extrusion process are very complicated. In this work, the material flow and thermal behavior of a 7 × × × aluminum alloy profile during an entire extrusion cycle are investigated numerically and experimentally. Hot compression tests are firstly carried out, and inverse analysis method is used to identify the material parameters of AA7N01 in Arrhenius constitutive model. The calculated global error is only 6.2 % between the predicted and experimental force-displacement curves, which verifies that the proposed model and obtained material parameters can describe well the rheological behavior of this alloy at elevated temperatures. Then a thermo-mechanical finite element model based on DEFROM-3D is built, and the transient extrusion process of the profile is simulated. By numerically analyzing the nose-end shape of the extruded profile, the evolution curves of exit temperature and of extrusion load, material flow and thermal behavior during extrusion process are investigated, respectively. Practical extrusion experiments verify the numerical model and results. Additional microstructure examination with electron backscatter diffraction (EBSD) technique also shows fine grains with the uniform grain size of about 9 μm on different locations of the extruded profile. Therefore, the material constitutive model and numerical model of extrusion process built in this work are capable enough to provide theoretical guidance in optimizing process parameters and designing extrusion dies.Keywords Thermo-mechanical behavior . Transient extrusion process . Arrhenius constitutive model . Inverse analysis method . High-strength 7 × × × aluminum alloy

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Flow behavior modeling of the 7050 aluminum alloy at elevated temperatures considering the compensation of strain

Cited by 93 publications

References 40 publications

Application of the Constitutive Model in Finite Element Simulation: Predicting the Flow Behavior for 5754 Aluminum Alloy during Hot Working

Application of the Constitutive Model in Finite Element Simulation: Predicting the Flow Behavior for 5754 Aluminum Alloy during Hot Working

Correction of Flow Curves and Constitutive Modelling of a Ti-6Al-4V Alloy

Numerical and experimental investigation on thermo-mechanical behavior during transient extrusion process of high-strength 7 × × × aluminum alloy profile

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