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Low-stress activation of plasticity at various twist grain boundaries in nanocrystalline aluminum: an atomistic study.

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Τίτλος: Low-stress activation of plasticity at various twist grain boundaries in nanocrystalline aluminum: an atomistic study.
Συγγραφείς: Manukhina, K. D.1 (AUTHOR), Mayer, A. E.1 (AUTHOR), Krasnikov, V. S.1 (AUTHOR) vas.krasnikov@gmail.com
Πηγή: Journal of Materials Science. Aug2026, Vol. 61 Issue 29, p21116-21128. 13p.
Θεματικοί όροι: *Crystal grain boundaries, *Material plasticity, *Crystallinity, *Dislocations in crystals, *Shear (Mechanics), *Molecular dynamics
Περίληψη: This work provides atomistic-scale observations that twist GBs act as low-stress plasticity sources. MD simulations of shear deformation in aluminum demonstrate that metastable twist GBs activate plastic sliding at remarkably low stresses, in contrast to tilt GBs. Plastic relaxation proceeds via two distinct mechanisms: LAGBs and IAGBs slide via conservative glide of intrinsic GB dislocations, while HAGBs deform through localized amorphization. GBs deforming by amorphization suppress high local stress, inhibiting subsequent dislocation emission. This suppression, coupled with hardening from grain rotation, allows such systems to reach exceptional flow stresses (> 1300 MPa). Existence of low-stress activation of twist GBs offers a plausible mechanism to reconcile macroscopic flow stress of nanocrystalline metals with Hall–Petch prediction. GB type, specifically the propensity of twist GBs to amorphize, is a key factor controlling strength. [ABSTRACT FROM AUTHOR]
Βάση Δεδομένων: Academic Search Index
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  – Url: https://dx.doi.org/doi:10.1007/s10853-026-13069-0
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  – Url: https://resolver.ebsco.com/c/fiv2js/result?sid=EBSCO:asx&genre=article&issn=00222461&ISBN=&volume=61&issue=29&date=20260801&spage=21116&pages=21116-21128&title=Journal of Materials Science&atitle=Low-stress%20activation%20of%20plasticity%20at%20various%20twist%20grain%20boundaries%20in%20nanocrystalline%20aluminum%3A%20an%20atomistic%20study.&aulast=Manukhina%2C%20K.%20D.&id=DOI:10.1007/s10853-026-13069-0
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  Data: Low-stress activation of plasticity at various twist grain boundaries in nanocrystalline aluminum: an atomistic study.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Materials+Science%22">Journal of Materials Science</searchLink>. Aug2026, Vol. 61 Issue 29, p21116-21128. 13p.
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  Data: *<searchLink fieldCode="DE" term="%22Crystal+grain+boundaries%22">Crystal grain boundaries</searchLink><br />*<searchLink fieldCode="DE" term="%22Material+plasticity%22">Material plasticity</searchLink><br />*<searchLink fieldCode="DE" term="%22Crystallinity%22">Crystallinity</searchLink><br />*<searchLink fieldCode="DE" term="%22Dislocations+in+crystals%22">Dislocations in crystals</searchLink><br />*<searchLink fieldCode="DE" term="%22Shear+%28Mechanics%29%22">Shear (Mechanics)</searchLink><br />*<searchLink fieldCode="DE" term="%22Molecular+dynamics%22">Molecular dynamics</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This work provides atomistic-scale observations that twist GBs act as low-stress plasticity sources. MD simulations of shear deformation in aluminum demonstrate that metastable twist GBs activate plastic sliding at remarkably low stresses, in contrast to tilt GBs. Plastic relaxation proceeds via two distinct mechanisms: LAGBs and IAGBs slide via conservative glide of intrinsic GB dislocations, while HAGBs deform through localized amorphization. GBs deforming by amorphization suppress high local stress, inhibiting subsequent dislocation emission. This suppression, coupled with hardening from grain rotation, allows such systems to reach exceptional flow stresses (> 1300 MPa). Existence of low-stress activation of twist GBs offers a plausible mechanism to reconcile macroscopic flow stress of nanocrystalline metals with Hall–Petch prediction. GB type, specifically the propensity of twist GBs to amorphize, is a key factor controlling strength. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1007/s10853-026-13069-0
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      – Code: eng
        Text: English
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        PageCount: 13
        StartPage: 21116
    Subjects:
      – SubjectFull: Crystal grain boundaries
        Type: general
      – SubjectFull: Material plasticity
        Type: general
      – SubjectFull: Crystallinity
        Type: general
      – SubjectFull: Dislocations in crystals
        Type: general
      – SubjectFull: Shear (Mechanics)
        Type: general
      – SubjectFull: Molecular dynamics
        Type: general
    Titles:
      – TitleFull: Low-stress activation of plasticity at various twist grain boundaries in nanocrystalline aluminum: an atomistic study.
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            NameFull: Manukhina, K. D.
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            NameFull: Mayer, A. E.
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            – D: 01
              M: 08
              Text: Aug2026
              Type: published
              Y: 2026
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              Value: 29
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            – TitleFull: Journal of Materials Science
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