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Cu atoms suppress misfit dislocations at the β″/Al interface in Al-Mg-Si alloys

Abstract

The Cu interactions with the Al–Mg–Si alloy main hardening phase β″ are investigated in atomic scale, by using experimental and simulated high angle annular dark-field scanning transmission electron microscopy techniques and density functional theory calculations. Cu is located at or near the β″/Al interface, with the misfit dislocations normally observed for a precipitate of this size being absent. It is proposed that the small Cu volume is crucial to this mechanism. Present supercell based calculations cannot fully model these interactions.
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Category

Academic article

Language

English

Author(s)

  • Takeshi Saito
  • Flemming J H Ehlers
  • Williams Lefebvre
  • David Hernandez-Maldonado
  • Ruben Bjørge
  • Calin Daniel Marioara
  • Sigmund Jarle Andersen
  • Eva Anne Mørtsell
  • Randi Holmestad

Affiliation

  • SINTEF Industry / Materials and Nanotechnology
  • University of Rouen Normandy
  • National Center for Scientific Research
  • Norwegian University of Science and Technology
  • Norsk Hydro ASA

Year

2016

Published in

Scripta Materialia

ISSN

1359-6462

Volume

110

Page(s)

6 - 9

View this publication at Norwegian Research Information Repository