Effect of heat treatment on hot deformation behavior and microstructure evolution of 7085 aluminum alloy

Chen, Songyi; Chen, Kanghua; Guo-sheng, Peng; Chen, Xuehai; Ceng, Qinghua

doi:10.1016/j.jallcom.2012.05.052

Cited by 94 publications

(37 citation statements)

References 20 publications

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“…This activation energy is lower than that of the Al-Zn-Mg-Er-Zr alloy reported by Wu [25] (189.67 kJ mol −1 ), but much higher than the bulk self-diffusion activation energy (142 kJ mol −1 ) of pure aluminum, indicating that dislocation cross-slip is the main deformation mechanism. Thus, the softening mechanism is dynamic recovery [26,27].…”

Section: ( ) mentioning

confidence: 99%

Study on rheological behavior and microstructural evolution of Al-6Mg-0.4Mn-0.15Sc-0.1Zr alloy by isothermal compression

Jiang

Liu

et al. 2020

Mater. Res. Express

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The effects of trace amounts of Sc/Zr on rheological properties and microstructural evolution of the Al-6Mg-0.4Mn-0.15Sc-0.1Zr alloy under different deformation conditions were studied by isothermal compression tests at deformation temperatures of 280°C∼460°C and strain rates of 0.001∼10 s −1 . A constitutive model based on the hyperbolic sine function was established. The dependence of the flow stress on strain, strain rate, and deformation temperature was described. Using experimental data and dynamic material model, machining diagrams of the alloy with strains of 0.3 and 0.5 were obtained, and the hot workability of the alloy was verified. The results showed that the deformation temperature and strain rate had significant effects on the deformation behavior of the alloy. The flow stress of the alloy increased with the increase in strain rate and decreased with the increase in deformation temperature. Under high-temperature and low-strain-rate conditions, the alloy tended to undergo dynamic recrystallization, and the volume fraction and grain size increased with the increase in deformation temperature and the decrease in strain rate. Based on the analysis of the microstructural evolution, the construction of the machining diagram, and the solution of the rheological constitutive equation, suitable values of the deformation temperature were determined to be 380°C~460°C. Moreover, suitable values of the strain rate were determined to be 0.001 and 0.3 s −1 . The deformation activation energy of 161.28 kJ mol −1 was obtained.

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Section: ( ) mentioning

confidence: 99%

Study on rheological behavior and microstructural evolution of Al-6Mg-0.4Mn-0.15Sc-0.1Zr alloy by isothermal compression

Jiang

Liu

et al. 2020

Mater. Res. Express

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“…e material constants are listed in Table 1, and equation (8) is the Arrhenius-type constitutive models for the AA6061 alloy under PSC with the activation energy Q of 175.836 kJ/mol. e Q is an important parameter serving as an indicator of difficulty degree in plasticity deformation, which is closely related to deformation mode in addition to alloy content and heat treatment [32,[34][35][36]. [22,37,38].…”

Section: Advances In Materials Science and Engineeringmentioning

confidence: 99%

Study on Constitutive Characteristic of As-Cast AA6061 Alloy under Plane Strain Compression Based on Orthogonal Analysis

Qin

Kang

et al. 2019

Advances in Materials Science and Engineering

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Constitutive relationship and microstructure evolution of as-cast AA6061 alloy were studied using plane strain compression (PSC) under the temperature of 300–450°C, the strain rate of 0.01–5 s−1, and the strain of 0.9. It is found that the flow stress decreases with increasing temperature and decreasing strain rate. The dynamic recovery (DRV) and recrystallization (DRX) are found to easily occur by optical microscopic (OM) techniques. The softening mechanisms are mainly due to DRV that is accompanied by a slight DRX. Based on orthogonal analysis, the strain should be taken into account to derive the constitutive model accurately, and the interaction effect between the strain rate and temperature on the stress can be neglected when compared with the individual effect of the strain rate and temperature. The strain-compensated constitutive models based on orthogonal experiment are established, and the activation energy Q is found to be 158.465 kJ/mol. The correlation coefficient and the average absolute relative error between the experimental and the predicted results are 0.9946 and 4.2656%, respectively. The developed models can be used to predict the stress precisely at a wide range of strains, strain rates, and temperatures.

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“…Although Sitdikov [18] compared the structural evolutionary law and microstructural deformation mechanism of 7475 aluminum alloy under high-temperature, multi-directional, and unidirectional compression, the author did not thoroughly illustrate the production of forging defects. Khaleed [19][20][21] performed a numerical simulation of closed forging of #45 steel connecting rods using three blanks with different shapes and concluded the optimal shape and dimension of blanks. However, the stress-strain field during the forging process was superficially discussed.…”

Section: State Of the Artmentioning

confidence: 99%

High-temperature Rheological Behavior and Numerical Simulation Technology for 6061 Aluminum Alloy Connecting Rods

Zhang¹,

Yu²

2018

JESTR

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Aluminum alloy connecting rods formed by common hot forging usually exhibit many surface defects, including cracks, folding, and disordered metal streamlines. These defects can considerably influence their performance. A thermosimulation compression experiment on 6061 aluminum alloy was conducted to prevent such defects and disclose the law of precise forging. The true stress-strain curves and stress peak under different deformation temperatures and strain rates were also obtained. The constitutive equation for the high-temperature rheological stress of 6061 aluminum alloy was derived. On the basis of this equation, the multi-field coupling problem of 6061 aluminum alloy connecting rods during closed forging deformation was discussed, and the influences of three forging techniques on forging results were analyzed. Results demonstrate that 6061 aluminum alloy is sensitive to positive strain rates. Steady-state flow stress is inversely proportional to temperature given a fixed strain rate, and flow stress is proportional to strain rate when the deformation temperature is fixed. During the closed forging process of aluminum alloy connecting rods, the upper and bottom punches move first, followed by the lateral punches, thereby resulting in a notable forging effect. Forging quality is inversely proportional to the movement order of lateral punches. In addition, the forging load of aluminum alloy connecting rods first increases and then decreases and finally increases. Forging load is proportional to deformation rate. The proposed method provides an excellent prospect to determine the closed forging technique of aluminum alloy.

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Effect of heat treatment on hot deformation behavior and microstructure evolution of 7085 aluminum alloy

Cited by 94 publications

References 20 publications

Study on rheological behavior and microstructural evolution of Al-6Mg-0.4Mn-0.15Sc-0.1Zr alloy by isothermal compression

Study on rheological behavior and microstructural evolution of Al-6Mg-0.4Mn-0.15Sc-0.1Zr alloy by isothermal compression

Study on Constitutive Characteristic of As-Cast AA6061 Alloy under Plane Strain Compression Based on Orthogonal Analysis

High-temperature Rheological Behavior and Numerical Simulation Technology for 6061 Aluminum Alloy Connecting Rods

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