Effects of strain rate and temperature on hot tensile deformation of severe plastic deformed 6061 aluminum alloy

Khamei, A.A.; Dehghani, K.

doi:10.1016/j.msea.2014.12.081

Cited by 49 publications

(14 citation statements)

References 37 publications

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“…It should be noted that samples deformed at various conditions were ruptured at different strains. Although this fact may have an effect on the accuracy of any comparisons based on the grain size measurements, such an analysis was still found to be appropriate for capturing microstructural evolution and underlying mechanisms [20,29,46,47]. From Table 3, it can be deduced that grain sizes of samples deformed at 200 • C under a strain rate of 0.01 s −1 are similar to those reported before tension, while samples deformed at 400 • C under the strain rate of 0.01 s −1 are characterized by coarser grains and larger dimples.…”

Section: Process-microstructure-property-damage Relationshipsmentioning

confidence: 99%

“…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%

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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: Process-microstructure-property-damage Relationshipsmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…Uniaxial tensile tests at different deformation conditions were used to a great extent to optimize the hot deformation behavior of the alloys, with the aim to prevent the cavitation and fracture of the parts processed [3]. Specifically, the uniaxial tensile test can be used to not only determine the strength of the alloy but also obtain the ductility data, which is valuable to evaluate various factors affecting the formability and performance under complex deformation conditions [4].…”

Section: Introductionmentioning

confidence: 99%

Hot Tensile and Fracture Behavior of 35CrMo Steel at Elevated Temperature and Strain Rate

Xiao

Huang

Liu

et al. 2016

Metals

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Abstract:To better understand the tensile deformation and fracture behavior of 35CrMo steel during hot processing, uniaxial tensile tests at elevated temperatures and strain rates were performed. Effects of deformation condition on the flow behavior, strain rate sensitivity, microstructure transformation, and fracture characteristic were characterized and discussed. The results indicated that the flow stress was sensitive to the deformation condition, and fracture occurs immediately after the peak stress level is reached, especially when the temperature is low or the strain rate is high. The strain rate sensitivity increases with the deformation temperature, which indicates that formability could improve at high temperatures. Photographs showing both the fracture surfaces and the matrix near the fracture section indicated the ductile nature of the material. However, the fracture mechanisms varied according to the deformation condition, which influences the dynamic recrystallization (DRX) condition, and the DRX was accompanied by the formation of voids. For samples deformed at high temperatures or low strain rates, coalescence of numerous voids formed in the recrystallized grains is responsible for fracture, while at high strain rates or low temperatures, the grains rupture mainly by splitting because of cracks formed around the inclusions.

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“…The effect of cold working in AA5xxx sheets have been widely studied [3,4]. The effect of plastic deformation methods-such as equal-channel angular pressing (ECAP), accumulative roll bonding (ARB), high pressure torsion (HPT), and constrained groove pressing (CGP), among others-have been reported for aluminum sheets [5][6][7][8]. However, to date, there are no reports of Al-5754 alloy processed by the so-called Repetitive Corrugation and Straightening (RCS) process, despite showing better forming capacity in comparison with other alloys from the same 5xxx series, and having applications on the automotive industry, e.g., on automotive panels [9].…”

Section: Introductionmentioning

confidence: 99%

Formability of the 5754-Aluminum Alloy Deformed by a Modified Repetitive Corrugation and Straightening Process

et al. 2020

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Sheets of 5754-aluminum alloy processed by a modified repetitive corrugation and straightening (RCS) process were tested in order to measure their formability. For this purpose, forming limit curves were derived. They showed that the material forming capacity decreased after being processed by RCS. However, they kept good formability in the initial stages of the RCS process. The formability study was complemented with microstructural analysis (derivation of texture) and mechanical tests to obtain the strain-rate sensitivity. The texture analysis was done by employing X-ray diffraction, obtaining pole figures, and the orientation distribution function. It was noticed that the initial texture was conserved after successive RCS passes, but the intensity dropped. RCS process did not induce β-fiber, contrary to common deformation process. The strain-rate sensitivity coefficient was measured through tensile tests at different temperatures and strain rates; the coefficient of the samples processed after one and two passes were still relatively high, indicating the capacity to delay necking, in agreement with the good formability observed in the initial passes of the RCS process.

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Effects of strain rate and temperature on hot tensile deformation of severe plastic deformed 6061 aluminum alloy

Cited by 49 publications

References 37 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 Tensile and Fracture Behavior of 35CrMo Steel at Elevated Temperature and Strain Rate

Formability of the 5754-Aluminum Alloy Deformed by a Modified Repetitive Corrugation and Straightening Process

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