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Effect of copper on fine precipitates at the early stage of aging in Al-Mg-X (X=Si, Ge, Zn) alloys

Abstract

Age-hardenable Al–Mg–Si, Al–Mg–Ge, and Al–Zn–Mg alloys including Cu were investigated by transmission electron microscopy to understand extra diffraction spots that appear in their selected area electron diffraction patterns. These alloys containing Cu exhibit similar extra diffracted spots to each other with diffracted spots or streaks for Al matrix and major precipitates in each alloy. The extra spots were not observed in Cu-free alloys. The initial cluster, which is based on the β″-phase in the Al–Mg–Si alloy, is proposed to be MgSi(/Ge)Mg, CuMgSi(/Ge), AlCuMg, and AlZnMg, while the second clusters, which consist of three initial clusters including anti-phase boundary short-range order, are proposed for Cu-containing alloys.

Category

Academic article

Language

English

Author(s)

  • Kenji Matsuda
  • Akihiro Kawai
  • Katsumi Watanabe
  • Seungwon Lee
  • Calin Daniel Marioara
  • Sigurd Wenner
  • Katsuhiko Nishimura
  • Teiichiro Matsuzaki
  • Norio Nunomura
  • Tatsuo Sato
  • Randi Holmestad
  • Susumu Ikeno

Affiliation

  • SINTEF Industry / Materials and Nanotechnology
  • Norwegian University of Science and Technology
  • Tokyo Institute of Technology
  • Toyama University
  • Riken

Year

2017

Published in

Keikinzoku

ISSN

0451-5994

Volume

67

Issue

5

Page(s)

186 - 192

View this publication at Norwegian Research Information Repository