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Dislocation Structure Near the Intergranular Fracture Surface of Cyclically Strained Polycrystalline Copper.

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Title: Dislocation Structure Near the Intergranular Fracture Surface of Cyclically Strained Polycrystalline Copper.
Authors: Polák, Jaroslav1 (AUTHOR) polak@ipm.cz, Poczklán, Ladislav1 (AUTHOR), Vražina, Tomáš1 (AUTHOR)
Source: Fatigue & Fracture of Engineering Materials & Structures. Jul2025, Vol. 48 Issue 7, p3110-3121. 12p.
Subjects: Dislocation structure, Strains & stresses (Mechanics), Surface strains, Stress fractures (Orthopedics), Copper
Abstract: Polycrystalline copper specimens were cycled with strain amplitudes, resulting in fatigue lives ranging from 105 to 107 cycles. The fracture surfaces were inspected in the SEM, and intergranular facets with surface relief were studied. FIB sections were produced, and lamellae for the TEM were prepared using FIB sectioning. Individual persistent slip markings on the facets, consisting of distinctive extrusions and intrusions, were inclined at an angle to the surface corresponding to the trace of the primary slip plane. Dislocation structures close to the surface of the facets were observed and analyzed. The dislocation structure consisted of randomly distributed dislocations and some dislocation sub‐boundaries. Contrary to the dislocation structure below the specimen surface, no specific dislocation structures corresponding to the persistent slip bands were found. The absence of localized cyclic strain‐induced dislocation patterns was discussed and attributed to the complex stress and strain history within the cyclic plastic zone of the propagating crack, where multiple slip systems were active. [ABSTRACT FROM AUTHOR]
Copyright of Fatigue & Fracture of Engineering Materials & Structures 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: Dislocation Structure Near the Intergranular Fracture Surface of Cyclically Strained Polycrystalline Copper.
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  Data: <searchLink fieldCode="DE" term="%22Dislocation+structure%22">Dislocation structure</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+strains%22">Surface strains</searchLink><br /><searchLink fieldCode="DE" term="%22Stress+fractures+%28Orthopedics%29%22">Stress fractures (Orthopedics)</searchLink><br /><searchLink fieldCode="DE" term="%22Copper%22">Copper</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Polycrystalline copper specimens were cycled with strain amplitudes, resulting in fatigue lives ranging from 105 to 107 cycles. The fracture surfaces were inspected in the SEM, and intergranular facets with surface relief were studied. FIB sections were produced, and lamellae for the TEM were prepared using FIB sectioning. Individual persistent slip markings on the facets, consisting of distinctive extrusions and intrusions, were inclined at an angle to the surface corresponding to the trace of the primary slip plane. Dislocation structures close to the surface of the facets were observed and analyzed. The dislocation structure consisted of randomly distributed dislocations and some dislocation sub‐boundaries. Contrary to the dislocation structure below the specimen surface, no specific dislocation structures corresponding to the persistent slip bands were found. The absence of localized cyclic strain‐induced dislocation patterns was discussed and attributed to the complex stress and strain history within the cyclic plastic zone of the propagating crack, where multiple slip systems were active. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Fatigue & Fracture of Engineering Materials & Structures 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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        Value: 10.1111/ffe.14663
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 12
        StartPage: 3110
    Subjects:
      – SubjectFull: Dislocation structure
        Type: general
      – SubjectFull: Strains & stresses (Mechanics)
        Type: general
      – SubjectFull: Surface strains
        Type: general
      – SubjectFull: Stress fractures (Orthopedics)
        Type: general
      – SubjectFull: Copper
        Type: general
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      – TitleFull: Dislocation Structure Near the Intergranular Fracture Surface of Cyclically Strained Polycrystalline Copper.
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            – D: 01
              M: 07
              Text: Jul2025
              Type: published
              Y: 2025
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