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The unique hybrid precipitate in a peak-aged Al-Cu-Mg-Ag alloy

Abstract

The prevalent hardening phase forming in an Al-Cu-Mg-Ag alloy after peak-aging at 150 and 190 °C has been investigated using transmission electron microscopy methods. The precipitate atomic structure was determined. It is a hybrid precipitate (HP) with plate morphology on {111}Al planes, consisting of orthorhombic and hexagonal structural fragments. Density functional theory calculations suggest that the hybridization reduces structural incompatibility of the HP plates with the Al matrix at the broad interfacial boundaries. Incorporation of Cu, Mg and Ag in the bulk HP structure reduces its formation enthalpy.
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Category

Academic article

Language

English

Author(s)

  • Marat Gazizov
  • A.O. Boev
  • Calin Daniel Marioara
  • Sigmund Jarle Andersen
  • Randi Holmestad
  • Rustam Kaibyshev
  • D.A. Aksyonov
  • V.S. Krasnikov

Affiliation

  • SINTEF Industry / Materials and Nanotechnology
  • Russia
  • Belgorod State National Research University
  • South Ural State University (National Research University)
  • Norwegian University of Science and Technology

Date

17.12.2020

Year

2020

Published in

Scripta Materialia

ISSN

1359-6462

Volume

194

Page(s)

1 - 5

View this publication at Norwegian Research Information Repository