Characterisation of structural similarities of precipitates in Mg–Zn and Al–Zn–Mg alloys systems

Artenis Bendo, Tomoyoshi Maeda, Kenji Matsuda, Adrian Lervik, Randi Holmestad, Calin D. Marioara, Katsuhiko Nishimura, Norio Nunomura, Hiroyuki Toda, Masatake Yamaguchi, Ken ichi Ikeda, Tomoyuki Homma

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

High angle annular dark field scanning transmission electron microscopy has been employed to observe precipitate structures in Al–Zn–Mg and Mg–Zn alloys. 1 precipitate structures in Al–Zn–Mg are commonly formed by MgZn2 Penrose bricks, but also frequently observed to incorporate Mg6Zn7 elongated hexagons via two different modes. Tilings of MgZn2 and Mg6Zn7 building blocks in both '1 in Mg–Zn and 1 in Al–Zn–Mg alloys, create overall patterns which deviate from the chemical and structural configuration of solely monoclinic Mg4Zn7 or MgZn2 unit cells. Precipitate morphologies were found to be correlated to their internal sub-unit cell arrangements, especially to Mg6Zn7 elongated hexagons. Systematic or random arrangements of Mg6Zn7 elongated hexagons inside precipitates and therefore compositional and structural patterns, were found to be strongly related to the aspect ratio of the precipitates and altering of the precipitate/matrix interfaces.

Original languageEnglish
Pages (from-to)2619-2635
Number of pages17
JournalPhilosophical Magazine
Volume99
Issue number21
DOIs
Publication statusPublished - Nov 2 2019

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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