The Hot Deformation Activation Energy of 7050 Aluminum Alloy under Three Different Deformation Modes

Sang, Deli; Fu, Ruidong; Li, Yijun

doi:10.3390/met6030049

Cited by 24 publications

(10 citation statements)

References 18 publications

(25 reference statements)

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“…Elevated temperature response of aluminum alloys is of interest for estimation of critical force levels for any application-oriented loading event as well as for metal forming at elevated temperatures [21,22,[28][29][30][31][32][33]. Many researchers utilized hot compression, tension, and torsion experiments to obtain flow curves at elevated temperatures [21,22,[28][29][30][31][32][33]. Instability phenomena during tensile testing are a barrier toward constitutive analysis.…”

Section: Introductionmentioning

confidence: 99%

Performance of Thermo-Mechanically Processed AA7075 Alloy at Elevated Temperatures—From Microstructure to Mechanical Properties

Sajadifar

Scharifi

Weidig

et al. 2020

Metals

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This study focuses on the high temperature characteristics of thermo-mechanically processed AA7075 alloy. An integrated die forming process that combines solution heat treatment and hot forming at different temperatures was employed to process the AA7075 alloy. Low die temperature resulted in the fabrication of parts with higher strength, similar to that of T6 condition, while forming this alloy in the hot die led to the fabrication of more ductile parts. Isothermal uniaxial tensile tests in the temperature range of 200–400 °C and at strain rates ranging from 0.001–0.1 s−1 were performed on the as-received material, and on both the solution heat-treated and the thermo-mechanically processed parts to explore the impacts of deformation parameters on the mechanical behavior at elevated temperatures. Flow stress levels of AA7075 alloy in all processing states were shown to be strongly temperature- and strain-rate dependent. Results imply that thermo-mechanical parameters are very influential on the mechanical properties of the AA7075 alloy formed at elevated temperatures. Microstructural studies were conducted by utilizing optical microscopy and a scanning electron microscope to reveal the dominant softening mechanism and the level of grain growth at elevated temperatures.

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Section: Introductionmentioning

confidence: 99%

Performance of Thermo-Mechanically Processed AA7075 Alloy at Elevated Temperatures—From Microstructure to Mechanical Properties

Sajadifar

Scharifi

Weidig

et al. 2020

Metals

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“…More generally, the deformation activation energy is an important physical and kinetic parameter indicating plastic deformability and qualitatively reflects the energy barrier to dislocation motion for metals, alloys as well as metal matrix nanocomposites (Li et al ., 2016; Wang et al ., 2017). In this end, it can be rationalised to expect a higher value of this energy signifying higher dragging forces to the movement of the dislocations in hot deformation processes (Sang et al ., 2016). To describe the relationship of flow stress on deformation temperature and strain rate, there are three typical constitutive equations namely the power, the exponential and the hyperbolic sine law.…”

Section: Resultsmentioning

confidence: 99%

Hot deformation behaviour of bimodal sized Al₂O₃/Al nanocomposites fabricated by spark plasma sintering

Sadeghi

Cavaliere

Nosko

et al. 2020

Journal of Microscopy

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The deformation behaviour of bimodal sized Al 2 O 3 /Al nanocomposites were investigated by hot compression tests conducted in the temperature range 350-500°C and strain rates of 0.001, 0.01 and 0.1 s-1. The dynamic recrystallisation behaviour of the nanocomposites strongly depended on the forming parameters. The bimodal sized Al 2 O 3 particles played a crucial role in the recrystallised microstructure. The addition of bimodal sized Al 2 O 3 particles led to a significant increase of activation energy of plastic deformation, corroborating the enhanced resistance of the nanocomposite to hot deformation. This was also reflected by the increased compressive yield strength in the nanocomposite due to both dislocation strengthening caused by n-Al 2 O 3 and preventing the grain growth due to the presence of μ-Al 2 O 3 at grain boundaries. It was found that with the decrease of Z values, local strain induced by deformation was released and the grain size of aluminium matrix gradually increased, indicating that the main softening mechanism of the bimodal sized Al 2 O 3 /Al nanocomposites was dynamic recrystallisation (DRX). The lower the Z value was, the easier the DRX occurred. The highly beneficial role of the bimodal sized Al 2 O 3 reinforcement in improving the high-temperature performance of aluminium matrix nanocomposite was discussed.

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“…ε is the strain rate (s −1 ), and T is the absolute deformation temperature (K). Equation (4) is obtained by taking the logarithm twice on both sides of Equation (2).…”

Section: Srx Kinetic Model Of 5754 Aluminium Alloymentioning

confidence: 99%

“…The heating process used to form materials is of remarkable importance, as it affects the quality of the products [1,2]. However, previous studies have shown that complex metallurgical structural changes that occurred during multi-pass hot rolling and hot compression processes resulted from competing work hardening and softening mechanisms [3,4].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of the Static Recrystallization of 5754 Aluminium Alloy by Cellular Automaton

Jia

Zhang

2018

Metals

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To study the factors that affect the mechanical properties of materials, double-pass hot compression tests were performed under different deformation parameters using a Gleeble-3500 thermo-simulation machine. The static softening behavior of 5754 aluminium alloy during testing was analyzed by the 0.2% offset-stress method. The results show that the static softening fraction was greatly influenced by deformation parameters and rapidly increased with increasing delay time, strain rate and deformation temperature. In addition, a mesoscopic cellular automaton (CA) model was employed to simulate the microstructural evolution of the static recrystallization (SRX) during the double-pass hot compression test of the 5754 aluminium alloy. The results show that the SRX nuclei first formed along the grain boundaries, where the energy was sufficient, and deformation parameters had a significant influence on the SRX of the 5754 aluminium alloy. The recrystallized volume fraction increased with increasing temperature, strain rate, and delay time among deformation stages. The mean recrystallized grain size increased with increasing deformation temperature and delay time. However, the mean grain size was slightly reduced with an increase in the strain rate from 0.1 s−1 to 1 s−1 at constant temperature and delay time.

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The Hot Deformation Activation Energy of 7050 Aluminum Alloy under Three Different Deformation Modes

Cited by 24 publications

References 18 publications

Performance of Thermo-Mechanically Processed AA7075 Alloy at Elevated Temperatures—From Microstructure to Mechanical Properties

Performance of Thermo-Mechanically Processed AA7075 Alloy at Elevated Temperatures—From Microstructure to Mechanical Properties

Hot deformation behaviour of bimodal sized Al₂O₃/Al nanocomposites fabricated by spark plasma sintering

Modeling and Simulation of the Static Recrystallization of 5754 Aluminium Alloy by Cellular Automaton

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The Hot Deformation Activation Energy of 7050 Aluminum Alloy under Three Different Deformation Modes

Cited by 24 publications

References 18 publications

Performance of Thermo-Mechanically Processed AA7075 Alloy at Elevated Temperatures—From Microstructure to Mechanical Properties

Performance of Thermo-Mechanically Processed AA7075 Alloy at Elevated Temperatures—From Microstructure to Mechanical Properties

Hot deformation behaviour of bimodal sized Al2O3/Al nanocomposites fabricated by spark plasma sintering

Modeling and Simulation of the Static Recrystallization of 5754 Aluminium Alloy by Cellular Automaton

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Hot deformation behaviour of bimodal sized Al₂O₃/Al nanocomposites fabricated by spark plasma sintering