A characterization for the dynamic recrystallization kinetics of as-extruded 7075 aluminum alloy based on true stress–strain curves

Quan, Guo-zheng; Mao, Yuan-ping; Li, Guisheng; Lv, Wen-quan; Wang, Yang; Zhou, Jie

doi:10.1016/j.commatsci.2011.11.031

Cited by 93 publications

(41 citation statements)

References 19 publications

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“…For a certain curve, the flow stress increases to a peak value in the initial stage of the compression, and then decreases gradually to a steady state. Further, from the experimental results shown in Figure 1a-d, it can be seen that the curve is composed of three stages 13 . In the first stage, the flow stress increases at a declining rate as the softening from dynamic recovery (DRV) becomes higher than the work hardening rate.…”

Section: True Stress and True Strainmentioning

confidence: 98%

The flow behavior modeling of as-extruded 3Cr20Ni10W2 austenitic heat-resistant alloy at elevated temperatures considering the effect of strain

Quan

Mao

et al. 2014

Mat. Res.

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In order to investigate the compressive deformation behavior of 3Cr20Ni10W2 alloy, a series of isothermal upsetting experiments were carried out in the temperature range of 1203-1403 K and strain rate range of 0.01-10 s -1 on a Gleeble-1500 thermo-mechanical simulator. The results indicate that the flow stress initially increases to a peak value and then decreases gradually to a steady state. The characteristics of the curves are determined by the interaction of work hardening (WH), dynamic recovery (DRV) and dynamic recrystallization (DRX). The flow stress decreases with increasing temperature and decreasing strain rate. The relationship between microstructure and processing parameters is discussed to give an insight into the hot deformation behavior of 3Cr20Ni10W2 alloy. Then, by regression analysis for constitutive equation, material constants (n, α, β, A and Q) were calculated for the peak stress. Further, the constitutive equation along the flow curve was developed by utilizing an eighth order polynomial of strain for variable coefficients (including n, α, Α and Q). The validity of the developed constitutive equation incorporating the influence of strain was verified through comparing the experimental and predicted data by using standard statistical parameters such as correlation coefficient (R) and average absolute relative error (AARE) that are 0.995 and 4.08% respectively.

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Section: True Stress and True Strainmentioning

confidence: 98%

The flow behavior modeling of as-extruded 3Cr20Ni10W2 austenitic heat-resistant alloy at elevated temperatures considering the effect of strain

Quan

Mao

et al. 2014

Mat. Res.

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“…The studies are limited to the relationship between hot-deformation conditions (deformation temperature and strain rate) and DRX. [7][8][9] There is little study on the impact of rolling deformation on the microstructure and properties of the 3003 aluminum alloy. The DRX of the 3003 aluminum alloy is rarely studied quantitatively, and the DRX state diagram is rarely used to study hot deformation.…”

Section: Introductionmentioning

confidence: 99%

Establishment of dynamic-recrystallization-state diagram for hot deformation of 3003 aluminum alloy

Chen¹,

Fu²,

Wei³

et al. 2018

Mater. Tehnol.

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The 3003 aluminum alloy was deformed with isothermal compression in a range of deformation temperature of 300-500°C at a strain rate of 0.0l-10.0 s -1 with a Gleeble-1500 thermal simulator. The results show that the flow stress of the 3003 aluminum alloy decreases with an increase in the deformation temperature or a decrease in the strain rate. A flow-stress constitutive model was build. The critical strain and steady strain were obtained with the strain-hardening rate. The critical strain increases with an increase in the Zener-Hollomon (Z) parameter, and the steady-state strain decreases with an increase in the Z parameter (a decrease in the deformation temperature or increase in the strain rate). A dynamic-recrystallization (DRX) state diagram was established in accordance with the eigenvalues of the flow-stress curve. Based on a microstructure observation, it was found that the smaller the Z parameter and the greater the strain, more complete was DRX. Keywords: 3003 aluminum alloy, dynamic recrystallization, state diagram, strain-hardening rate Avtorji prispevka so aluminijevo zlitino 3003 izotermno tla~no deformirali v obmo~ju deformacijskih temperatur med 300°C in 500°C pri hitrostih deformacije med 0,0l s -1 in 10,0 s -1 na termi~nem simulatorju Gleeble-1500. Rezultati deformacijskih preizkusov so pokazali, da meja te~enja izbrane zlitine pada z nara{~ajo~o temperaturo deformacije ali z zmanj{evanjem hitrosti deformacije. Na osnovi preizkusov so avtorji izdelali tudi konstitutivni model za mejo te~enja v odvisnosti od temperature in hitrosti deformacije. Kriti~no deformacijo in stalno deformacijo so dobili s hitrostjo deformacijskega utrjevanja. Kriti~na deformacija je nara{~ala z nara{~anjem Zener -Hollomonovega (Z) parametra, in stanje stalne deformacije se je zmanj{evalo z nara{~anjem Z parametra (zmanj{anje temperature deformacije ali pove~evanje hitrosti deformacije). Diagram stanja dinami~ne rekristalizacije (DRX) so izdelali s pomo~jo karakteristi~nih vrednosti krivulj te~enja. S kombinacijo mikrostrukturnih preiskav, manj{ih Z parametrov in ve~jih deformacij, so lahko izdelali bolj celovit DRX.

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“…Deformation behaviors of metal materials are considered as the comprehensive presentation of material properties and processing parameters, such as temperature, strain rate and strain [1][2][3][4]. Since the flow behaviors of materials provide valuable information and crucial instructions for thermoplastic processing, an increasing number of researchers have paid great attention to this field.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Constitutive Relationship of Al–0.62Mg–0.73Si Alloy Based on Artificial Neural Network

Han

Yan

Sun

et al. 2017

Metals

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Abstract:In this work, the hot deformation behavior of 6A02 aluminum alloy was investigated by isothermal compression tests conducted in the temperature range of 683-783 K and strain-rate range of 0.001-1 s −1 . According to the obtained true stress-true strain curves, the constitutive relationship of the alloy was revealed by establishing the Arrhenius-type constitutive model and back-propagation (BP) neural network model. It is found that the flow characteristic of 6A02 aluminum alloy is closely related to deformation temperature and strain rate, and the true stress decreases with increasing temperatures and decreasing strain rates. The hot deformation activation energy is calculated to be 168.916 kJ mol −1 . The BP neural network model with one hidden layer and 20 neurons in the hidden layer is developed. The accuracy in prediction of the Arrhenius-type constitutive model and BP neural network model is eveluated by using statistics analysis method. It is demonstrated that the BP neural network model has better performance in predicting the flow stress.

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A characterization for the dynamic recrystallization kinetics of as-extruded 7075 aluminum alloy based on true stress–strain curves

Cited by 93 publications

References 19 publications

The flow behavior modeling of as-extruded 3Cr20Ni10W2 austenitic heat-resistant alloy at elevated temperatures considering the effect of strain

The flow behavior modeling of as-extruded 3Cr20Ni10W2 austenitic heat-resistant alloy at elevated temperatures considering the effect of strain

Establishment of dynamic-recrystallization-state diagram for hot deformation of 3003 aluminum alloy

Modeling the Constitutive Relationship of Al–0.62Mg–0.73Si Alloy Based on Artificial Neural Network

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