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Atomic structure of solute clusters in Al-Zn-Mg alloys

Atomic structure of solute clusters in Al-Zn-Mg alloys

Category
Academic article
Abstract
Scanning transmission electron microscopy imaging of Al–Zn–Mg alloys has provided new information on the atomic structures of solute rich clusters forming from a supersaturated solid solution at low temperatures. A unique unit of high Zn/Mg ratio is the fundamental cluster building block. The unit is essentially a partial substitution by Mg and Zn on the cubic aluminium cell and its surrounding truncated cube octahedral shell. A simple set of principles based on Frank–Kasper structures describes how the basic units arrange with respect to each other to form larger clusters. Density functional theory calculations, atom probe tomography and simulated diffraction patterns support the proposed atomic models. The results provide new insight into the very early stages of age-hardening in aluminium alloys.
Client
  • Research Council of Norway (RCN) / 249698
  • Research Council of Norway (RCN) / 269842
  • NORTEM / 197405
  • Norwegian University of Science and Technology / 2060193
  • Research Council of Norway (RCN) / 294933
  • Norwegian University of Science and Technology / Alldesign
  • Notur/NorStore / NN9158K
  • Research Council of Norway (RCN) / 247598
Language
English
Author(s)
Affiliation
  • Norwegian University of Science and Technology
  • SINTEF Industry / Materials and Nanotechnology
  • Toyama University
Year
Published in
Acta Materialia
ISSN
1359-6454
Publisher
Pergamon Press
Volume
205