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Effect of Copper Addition on Precipitation Behavior near Grain Boundary in Al–Zn–Mg Alloy

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Title: Effect of Copper Addition on Precipitation Behavior near Grain Boundary in Al–Zn–Mg Alloy
Authors: Matsuda, Kenji Browse this author
Yasumoto, Toru Browse this author
Bendo, Artenis Browse this author
Tsuchiya, Taiki Browse this author
Lee, Seungwon Browse this author
Nishimura, Katsuhiko Browse this author
Nunomura, Norio Browse this author
Marioara, Calin D. Browse this author
Levik, Adrian Browse this author
Holmestad, Randi Browse this author
Toda, Hiroyuki Browse this author
Yamaguchi, Masatake Browse this author
Ikeda, Ken-ichi Browse this author →KAKEN DB
Homma, Tomoyuki Browse this author
Ikeno, Susumu Browse this author
Keywords: aluminum-zinc-magnesium alloy
copper addition
transmission electron microscopy
Issue Date: 1-Aug-2019
Publisher: The Japan Institute of Light Metals
Volume: 60
Issue: 8
Start Page: 1688
End Page: 1696
Publisher DOI: 10.2320/matertrans.L-M2019828
Abstract: The effect of Cu-addition on age-hardening and precipitation have been investigated by hardness measurement, tensile test, high resolution transmission electron microscopy (HRTEM) and high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) techniques. Higher hardness, strength, and lower elongation were caused by increasing amount of Zn + Mg because of increased number density of precipitates. Cu addition also provided even higher peak hardness, strength, and lower elongation. The alloy containing highest Cu content had fine precipitates of GPB-II zones or the second clusters, in the precipitate free zones (PFZs) and the matrix, together with η′/η in the matrix from the early stage of aging. Two regions have been confirmed as the PFZs in the peak aged alloy containing highest Cu: (i) nearest to grain boundary (GB) about 70 nm in width (n-PFZ) and (ii) conventional PFZ about 400 nm in width which can be confirmed by conventional TEM (con-PFZ). The con-PFZ contains fine precipitates consisting of GPB-II zones or the second clusters, even for 2 minutes of aging at 473 K which were not present in the n-PFZ. The fine precipitates, GPB-II zones or the second clusters in the con-PFZ and the matrix disappeared at overaged condition.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 池田 賢一

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