| 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 |
| precipitation |
| copper addition |
| clusters |
| transmission electron microscopy |
| Issue Date: | 1-Aug-2019 |
| Publisher: | The Japan Institute of Light Metals |
| Journal Title: | MATERIALS TRANSACTIONS |
| 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 |
| URI: | http://hdl.handle.net/2115/76658 |
| 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)
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