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Deformation behavior and microstructural evolution of 7075-T6 aluminum alloy at cryogenic temperatures.

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Title: Deformation behavior and microstructural evolution of 7075-T6 aluminum alloy at cryogenic temperatures.
Authors: Lee, Woei-Shyan1 wslee@mail.ncku.edu.tw, Lin, Ching-Rong1
Source: Cryogenics. Oct2016, Vol. 79, p26-34. 9p.
Subjects: Aluminum alloys, Deformations (Mechanics), Microstructure, Cryogenics, Hopkinson bars (Testing), Strain rate
Abstract: The impact deformation behavior and associated microstructural evolution of 7075-T6 aluminum alloy at cryogenic temperatures are investigated using a compressive split-Hopkinson pressure bar (SHPB) system. Cylindrical specimens are deformed at strain rates of 1 × 10 3 s −1 , 2 × 10 3 s −1 , 3 × 10 3 s −1 and 5 × 10 3 s −1 and temperatures of 0 °C, −100 °C and −196 °C. It is shown that the flow stress is strongly dependent on the strain rate and temperature. For a given temperature, the flow stress varies with the strain rate in accordance with a power law relation with an average exponent of 0.157 and an activation energy of 0.7 kJ/mol. Moreover, the coupled effects of the strain rate and temperature on the flow stress are adequately described by the Zener-Hollomon parameter (Z). For all test temperatures, catastrophic failure occurs only under the highest strain rate of 5 × 10 3 s −1 , and is the result of adiabatic shear. An increasing strain rate or reducing temperature leads to a greater dislocation density and a smaller grain size. Finally, the dependence of the flow stress on the microstructural properties of the impacted 7075-T6 specimens is well described by a specific Hall-Petch constitutive model with constants of K = 108.3 MPa μm 1/2 and K ′ = 16.1 MPa μm, respectively. Overall, the results presented in this study provide a useful insight into the combined effects of strain rate and temperature on the flow resistance and deformability of 7075-T6 alloy and confirm that 7075-T6 is well suited to the fabrication of fuel tanks and related structural components in the aerospace field. [ABSTRACT FROM AUTHOR]
Copyright of Cryogenics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Deformation behavior and microstructural evolution of 7075-T6 aluminum alloy at cryogenic temperatures.
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  Data: <searchLink fieldCode="JN" term="%22Cryogenics%22">Cryogenics</searchLink>. Oct2016, Vol. 79, p26-34. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Aluminum+alloys%22">Aluminum alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Deformations+%28Mechanics%29%22">Deformations (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Cryogenics%22">Cryogenics</searchLink><br /><searchLink fieldCode="DE" term="%22Hopkinson+bars+%28Testing%29%22">Hopkinson bars (Testing)</searchLink><br /><searchLink fieldCode="DE" term="%22Strain+rate%22">Strain rate</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: The impact deformation behavior and associated microstructural evolution of 7075-T6 aluminum alloy at cryogenic temperatures are investigated using a compressive split-Hopkinson pressure bar (SHPB) system. Cylindrical specimens are deformed at strain rates of 1 × 10 3 s −1 , 2 × 10 3 s −1 , 3 × 10 3 s −1 and 5 × 10 3 s −1 and temperatures of 0 °C, −100 °C and −196 °C. It is shown that the flow stress is strongly dependent on the strain rate and temperature. For a given temperature, the flow stress varies with the strain rate in accordance with a power law relation with an average exponent of 0.157 and an activation energy of 0.7 kJ/mol. Moreover, the coupled effects of the strain rate and temperature on the flow stress are adequately described by the Zener-Hollomon parameter (Z). For all test temperatures, catastrophic failure occurs only under the highest strain rate of 5 × 10 3 s −1 , and is the result of adiabatic shear. An increasing strain rate or reducing temperature leads to a greater dislocation density and a smaller grain size. Finally, the dependence of the flow stress on the microstructural properties of the impacted 7075-T6 specimens is well described by a specific Hall-Petch constitutive model with constants of K = 108.3 MPa μm 1/2 and K ′ = 16.1 MPa μm, respectively. Overall, the results presented in this study provide a useful insight into the combined effects of strain rate and temperature on the flow resistance and deformability of 7075-T6 alloy and confirm that 7075-T6 is well suited to the fabrication of fuel tanks and related structural components in the aerospace field. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Cryogenics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.cryogenics.2016.07.007
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      – Code: eng
        Text: English
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        PageCount: 9
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      – SubjectFull: Aluminum alloys
        Type: general
      – SubjectFull: Deformations (Mechanics)
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      – SubjectFull: Microstructure
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      – SubjectFull: Hopkinson bars (Testing)
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      – SubjectFull: Strain rate
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              Text: Oct2016
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