Atomic scale HAADF-STEM study of η′ and η 1 phases in peak-aged Al–Zn–Mg alloys

Artenis Bendo, Kenji Matsuda, Seungwon Lee, Katsuhiko Nishimura, Norio Nunomura, Hiroyuki Toda, Masatake Yamaguchi, Tomohito Tsuru, Kyosuke Hirayama, Kazuyuki Shimizu, Hongye Gao, Kenichi Ebihara, Mitsuhiro Itakura, Tomoo Yoshida, Satoshi Murakami

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)


The microstructures of precipitates in Al–Zn–Mg alloys in peak-aged condition have been studied using scanning transmission electron microscope. The same thermo-mechanical treatment was applied in all alloys. Investigation of peak-aged samples revealed that the most commonly found phases were η′ and η1 with their respective habit planes on {111}Al and {100}Al. η′ phases under [110]Al were analyzed and compared with η′ structure models. Furthermore, a close inspection of η1 phase as the second most found precipitate revealed that it incorporates an anti-phase resembling boundary, not observed in other orientation relationships that precipitates create with Al matrix, in addition, differences in matrix-precipitate interfaces between η′/η2 and η1 phases were noticed. This paper addresses the first part to the analysis of η′ phase. Next part is extended to the analysis of the η1 phase.

Original languageEnglish
Pages (from-to)4598-4611
Number of pages14
JournalJournal of Materials Science
Issue number6
Publication statusPublished - Mar 1 2018

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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