Hot ductility behavior of an extruded 7075 aluminum alloy

Taheri‐Mandarjani, Mahsa; Zarei-Hanzaki, A.; Abedi, H.R.

doi:10.1016/j.msea.2015.03.038

Cited by 61 publications

(19 citation statements)

References 42 publications

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“…However, in this temperature regime, we found that the ductility decreases as the temperature increases (Figure 4). Although this behavior is rather counterintuitive [24], such a phenomenon has been observed in previous works on different types of metallic materials, such as copper [25], steels [26,27] and other aluminum alloys [8,9,26]. We suggest that as the test temperature increases (and approaches the nonequilibrium solidus), diffusion creep becomes more dominant.…”

Section: Deformation Mechanisms and Fracture Behaviorsupporting

confidence: 57%

Tensile mechanical properties, constitutive parameters and fracture characteristics of an as-cast AA7050 alloy in the near-solidus temperature regime

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Miroux

Eskin

et al. 2017

Materials Science and Engineering: A

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The knowledge on constitutive mechanical behavior at the temperatures close to the solidus is essential for predicting high-temperature deformation and fracture, e.g. cold and hot cracking of aluminum alloys. In this work we studied the tensile mechanical properties of an as-cast AA7050 alloy in a near-solidus temperature regime. Tensile tests were carried out using Gleeble-3800 TM system at temperatures from 400 to 465 °C and at strain rates from 0.0005 to 0.05 s -1 . The resultsshow that the strength decreases with increasing temperature and decreasing strain rate.Meanwhile, ductility decreases with the increase of temperature and strain rate. The constitutive parameters were extracted by fitting the test data to the extended-Ludwik and creep-law equations. The parameters for the extended-Ludwik equation are continuous with the values from a lower temperature regime obtained earlier, while the parameters for the creep-law equation are comparable with those obtained on other 7XXX aluminum alloys. We observed a change in fracture mode at 450 °C; from ductile transgranular to intergranular. This temperature coincides with the discontinuity point of the temperature-ductility slope. On the fracture surface of a sample that was deformed at 465 °C with a strain rate of 0.0005 s -1 , we observed features characteristic of micro-superplasticity. Considering the test conditions, viscous flows of incipient melt or liquid-like substances are suggested to be responsible for the formation of this feature.2 Keywords: AA7050, near-solidus temperature, tensile mechanical behavior, constitutive parameters, fracture surface analysis.

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Section: Deformation Mechanisms and Fracture Behaviorsupporting

confidence: 57%

Tensile mechanical properties, constitutive parameters and fracture characteristics of an as-cast AA7050 alloy in the near-solidus temperature regime

Subroto

Miroux

Eskin

et al. 2017

Materials Science and Engineering: A

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“…El-Magd, E. et al [ 16 ] asserted that under tensile loading, nucleation, growth, and the coalescence of microvoids dominates the failure of AA7075 alloy. According to Taheri-Mandarjani, M. et al [ 17 ], the decline of ductility at 350 °C and at strain rates of 10 −2 and 10 −3 s −1 is mainly due to the brittle Fe-rich phases during the deformation process.…”

Section: Introductionmentioning

confidence: 99%

Effects of Temperature and Strain Rate on the Fracture Behaviors of an Al-Zn-Mg-Cu Alloy

et al. 2018

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Effects of temperature and strain rate on the fracture behaviors of an Al-Zn-Mg-Cu alloy are investigated by isothermal uniaxial tensile experiments at a wide range of temperatures and strain rates, from room temperature (RT) to 400 °C and from 10−4 s−1 to 10−1 s–1, respectively. Generally, the elevation of temperature leads to the increasing of elongation to fracture and the reduction of peak stress, while higher strain rate results in the decreasing of elongation to fracture and the increasing of peak stress. Interestingly, we found that the coefficient of strain rate sensitivity (m-value) considerably rises at 200 °C and work of fracture (Wf) fluctuates drastically with the increase of strain rate at RT and 100 °C, both of which signify a non-uniform and unstable deformation state below 200 °C. A competition of work hardening (WH) and dynamic recrystallization (DRX) exists at 200 °C, making it serve as a transitional temperature. Below 200 °C, WH is the main deformation mechanism of flow stress, and DRX dominates the flow stress above 200 °C. It has been found that from RT to 200 °C, the main feature of microstructure is the generation of dimples and microvoids. Above 200 °C, the coalescence of dimples and microvoids mainly leads to the failure of specimen, while the phenomenon of typically equiaxed dimples and nucleation appear at 400 °C. The observations of microstructure are perfectly consistent with the related macroscopic results. The present work is able to provide a comprehensive understanding of flow stress of an Al-Zn-Mg-Cu alloy at a wide range of temperatures and strain rates, which will offer valuable information to the optimization of the hot forming process and structural design of the studied alloy.

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“…Alloys. Wang et al [77][78][79][80][81][82][83][84][85][86] performed superplastic investigation on the friction stir processed (FSP) Al-Zn-Mg-Cu alloy at the temperature of 500°C-535°C and a high strain rate of 0.01/s. e results proved that the FSP Al-Zn-Mg-Cu alloy possesses excellent thermal stability even up to incipient melting temperature; furthermore, a highest elongation of 3250% was obtained at 535°C and 0.01/s.…”

Section: Al-zn-mgmentioning

confidence: 99%

A Review on Superplastic Formation Behavior of Al Alloys

Wang

et al. 2018

Advances in Materials Science and Engineering

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Superplastic formation technology is considered to be an effective and promising method to conquer formation difficulties of Al alloys, especially thin-walled or complex structure. In this paper, fundamentals of superplastic deformation of Al alloys are summarized and the superplastic deformation behaviors of main kinds of Al alloys are summarized and compared, including Al-Mg alloys, Al-Li alloys, and Al-Zn-Mg alloys as well as aluminum matrix composites. Then, the superplastic deformation mechanism for different Al alloys is thoroughly discussed. Last but not the least, the factors affecting the superplastic deformation process are fully analyzed.

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Hot ductility behavior of an extruded 7075 aluminum alloy

Cited by 61 publications

References 42 publications

Tensile mechanical properties, constitutive parameters and fracture characteristics of an as-cast AA7050 alloy in the near-solidus temperature regime

Tensile mechanical properties, constitutive parameters and fracture characteristics of an as-cast AA7050 alloy in the near-solidus temperature regime

Effects of Temperature and Strain Rate on the Fracture Behaviors of an Al-Zn-Mg-Cu Alloy

A Review on Superplastic Formation Behavior of Al Alloys

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