Cristin-resultat-ID: 1025348
Sist endret: 12. juni 2013, 13:34
NVI-rapporteringsår: 2013
Resultat
Vitenskapelig artikkel
2013

TEM study of beta ' precipitate interaction mechanisms with dislocations and beta ' interfaces with the aluminium matrix in Al-Mg-Si alloys

Bidragsytere:
  • Katharina Teichmann
  • Calin Daniel Marioara
  • Sigmund Jarle Andersen og
  • Knut Marthinsen

Tidsskrift

Materials Characterization
ISSN 1044-5803
e-ISSN 1873-4189
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2013
Volum: 75
Sider: 1 - 7

Importkilder

Isi-ID: 000314860900001

Beskrivelse Beskrivelse

Tittel

TEM study of beta ' precipitate interaction mechanisms with dislocations and beta ' interfaces with the aluminium matrix in Al-Mg-Si alloys

Sammendrag

The interaction mechanisms between dislocations and semi-coherent, needle-shaped β′ precipitates in Al–Mg–Si alloys have been studied by High Resolution Transmission Electron Microscopy (HRTEM). Dislocation loops appearing as broad contrast rings around the precipitate cross-sections were identified in the Al matrix. A size dependency of the interaction mechanism was observed; the precipitates were sheared when the longest dimension of their cross-section was shorter than approximately 15 nm, and looped otherwise. A more narrow ring located between the Al matrix and bulk β′ indicates the presence of a transition interface layer. Together with the bulk β′ structure, this was further investigated by High Angle Annular Dark Field Scanning TEM (HAADF-STEM). In the bulk β′ a higher intensity could be correlated with a third of the Si-columns, as predicted from the published structure. The transition layer incorporates Si columns in the same arrangement as in bulk β′, although it is structurally distinct from it. The Z-contrast information and arrangement of these Si-columns demonstrate that they are an extension of the Si-network known to structurally connect all the precipitate phases in the Al–Mg–Si(–Cu) system. The width of the interface layer was estimated to about 1 nm.

Bidragsytere

Katharina Teichmann

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet

Calin Daniel Marioara

  • Tilknyttet:
    Forfatter
    ved Materialer og nanoteknologi ved SINTEF AS

Sigmund Jarle Andersen

  • Tilknyttet:
    Forfatter
    ved Materialer og nanoteknologi ved SINTEF AS

Knut Marthinsen

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet
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