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In Situ Neutron Diffraction Investigating Microstructure and Texture Evolution upon Heating of Nanostructured CoCrFeNi High-Entropy Alloy.

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Titel: In Situ Neutron Diffraction Investigating Microstructure and Texture Evolution upon Heating of Nanostructured CoCrFeNi High-Entropy Alloy.
Autoren: Xiaojing Liu, Jae-Kyung Han, Yusuke Onuki, Kuzminova, Yulia O., Evlashin, Stanislav A., Megumi Kawasaki, Liss, Klaus-Dieter
Quelle: Advanced Engineering Materials; 3/15/2023, Vol. 25 Issue 6, p1-15, 15p
Schlagwörter: NEUTRON diffraction, MICROSTRUCTURE, FACE centered cubic structure, DISLOCATION density, CRYSTAL grain boundaries
Abstract: Herein, in situ temperature-dependent neutron experiments investigate the microstructural evolution of additively and conventionally manufactured CoCrFeNi high-entropy alloys, as-received, and after grain refinement through high-pressure torsion. The evolution of texture after grain refinement and during heating is consistent with typical fcc metals. Both conventional and modified Williamson-Hall analyses reveal that major contributions of microstresses stem from dislocations. For the nanostructured material, three temperature regimes are identified on a heating ramp, namely, stress recovery up to 800 K, followed by recrystallization at 850-960 K, and normal grain growth above, in line with the physical change of hardness increase on recovery, decrease on recrystallization, and cutback to the as-manufactured values after grain growth. The as-printed material exposes higher dislocation density than as-cast, reducing slightly upon heating, while there is limited temperature dependence on the lower dislocation density of the as-cast specimen. Stored energies have been elaborated for residual stress and Bauschinger contributions, dislocation energy, grain boundary amounts, and vacancy contents with scenarios of vacancy expulsion leading to recrystallization. Ultimately, the fully recrystallized nanostructured material shows the lowest dislocation density, which may render a recipe for stress release in additively manufactured materials. [ABSTRACT FROM AUTHOR]
Copyright of Advanced Engineering Materials is the property of Wiley-Blackwell 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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  Data: In Situ Neutron Diffraction Investigating Microstructure and Texture Evolution upon Heating of Nanostructured CoCrFeNi High-Entropy Alloy.
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  Data: <searchLink fieldCode="AR" term="%22Xiaojing+Liu%22">Xiaojing Liu</searchLink><br /><searchLink fieldCode="AR" term="%22Jae-Kyung+Han%22">Jae-Kyung Han</searchLink><br /><searchLink fieldCode="AR" term="%22Yusuke+Onuki%22">Yusuke Onuki</searchLink><br /><searchLink fieldCode="AR" term="%22Kuzminova%2C+Yulia+O%2E%22">Kuzminova, Yulia O.</searchLink><br /><searchLink fieldCode="AR" term="%22Evlashin%2C+Stanislav+A%2E%22">Evlashin, Stanislav A.</searchLink><br /><searchLink fieldCode="AR" term="%22Megumi+Kawasaki%22">Megumi Kawasaki</searchLink><br /><searchLink fieldCode="AR" term="%22Liss%2C+Klaus-Dieter%22">Liss, Klaus-Dieter</searchLink>
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  Data: Advanced Engineering Materials; 3/15/2023, Vol. 25 Issue 6, p1-15, 15p
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  Data: <searchLink fieldCode="DE" term="%22NEUTRON+diffraction%22">NEUTRON diffraction</searchLink><br /><searchLink fieldCode="DE" term="%22MICROSTRUCTURE%22">MICROSTRUCTURE</searchLink><br /><searchLink fieldCode="DE" term="%22FACE+centered+cubic+structure%22">FACE centered cubic structure</searchLink><br /><searchLink fieldCode="DE" term="%22DISLOCATION+density%22">DISLOCATION density</searchLink><br /><searchLink fieldCode="DE" term="%22CRYSTAL+grain+boundaries%22">CRYSTAL grain boundaries</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Herein, in situ temperature-dependent neutron experiments investigate the microstructural evolution of additively and conventionally manufactured CoCrFeNi high-entropy alloys, as-received, and after grain refinement through high-pressure torsion. The evolution of texture after grain refinement and during heating is consistent with typical fcc metals. Both conventional and modified Williamson-Hall analyses reveal that major contributions of microstresses stem from dislocations. For the nanostructured material, three temperature regimes are identified on a heating ramp, namely, stress recovery up to 800 K, followed by recrystallization at 850-960 K, and normal grain growth above, in line with the physical change of hardness increase on recovery, decrease on recrystallization, and cutback to the as-manufactured values after grain growth. The as-printed material exposes higher dislocation density than as-cast, reducing slightly upon heating, while there is limited temperature dependence on the lower dislocation density of the as-cast specimen. Stored energies have been elaborated for residual stress and Bauschinger contributions, dislocation energy, grain boundary amounts, and vacancy contents with scenarios of vacancy expulsion leading to recrystallization. Ultimately, the fully recrystallized nanostructured material shows the lowest dislocation density, which may render a recipe for stress release in additively manufactured materials. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label:
  Group: Ab
  Data: <i>Copyright of Advanced Engineering Materials is the property of Wiley-Blackwell 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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      – Type: doi
        Value: 10.1002/adem.202201256
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      – Code: eng
        Text: English
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      – SubjectFull: NEUTRON diffraction
        Type: general
      – SubjectFull: MICROSTRUCTURE
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      – SubjectFull: FACE centered cubic structure
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      – SubjectFull: DISLOCATION density
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      – SubjectFull: CRYSTAL grain boundaries
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              Text: 3/15/2023
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              Y: 2023
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