Effects of Ag/Sc microadditions on the precipitation of over-aged Al-Zn-Mg-Cu alloys

被引：13
作者：
Kim, Yong-You [1 ,2 ]
Euh, Kwangjun [1 ,2 ]
Kim, Su-Hyeon [1 ]
Son, Hyeon-Woo [1 ]
机构：
[1] Korea Inst Mat Sci, Adv Met Div, Republ Korea, Chang Won 51508, South Korea
[2] Univ Sci & Technol, Adv Mat Engn, Republ Korea, Daejeon 34113, South Korea
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2025年 / 209卷
关键词：
Aluminum alloys; Microalloying; Precipitation; Atom-probe tomography; Thermal stability; MECHANICAL-PROPERTIES; ELECTRON-MICROSCOPY; EARLY-STAGE; SC; MICROSTRUCTURE; SOLUTE; STABILITY; SILVER; NUCLEATION; PHASE;
D O I：
10.1016/j.jmst.2024.05.032
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Microalloying addition plays a significant role in controlling the characteristics of precipitates in Al alloys. This study investigates the effects of Ag and Sc microalloying addition on the thermal stability of Al-Zn- Mg-Cu alloys, via differential scanning calorimetry, transmission electron microscopy, and atom-probe tomography. The results demonstrate that Ag and Sc additions increase the number density of eta-MgZn2 type nano-precipitates (formed during heat treatment) by forming direct (Mg-Ag phase, prototype of precipitate) or indirect precursors (Al2 Sc phase, constituent of precipitate) for the precipitate. In addition, the Ag and Sc elements can effectively prevent the coarsening of eta precipitates and facilitate the highdensity distribution of fine eta precipitates, during the over-aging period, improving the thermal stability of the Al-Zn-Mg-Cu alloys. The thermal stability is particularly improved by Ag addition because Ag atoms directly prevent the coarsening of eta precipitates by hindering Zn diffusion into the precipitate. On the contrary, Sc addition indirectly prevents the coarsening of eta precipitates by depleting the solute species from the Al matrix, enabling abundant precipitates limited growth. Thus Ag addition improves precipitation strengthening by preventing the coarsening of precipitates during over-aging. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ )
引用
收藏
页码：219 / 229
页数：11
相关论文
共 47 条
[21]   The effect of silver addition on 7055 Al alloy [J].
Lee, CW ;
Chung, YH ;
Cho, KK ;
Shin, MC .
MATERIALS & DESIGN, 1997, 18 (4-6) :327-332
[22]   Study of aging stability and precipitation kinetic of the Al-Zn-Mg alloy applied for auto body structures [J].
Li, Hui ;
Sun, Xiangcheng ;
Wang, Jiayi ;
Wang, Liqiang .
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, 2020, 9 (06) :15575-15584
[23]   Crystal structure and phase stability of AlSc in the near-equiatomic Al-Sc alloy [J].
Li, Juan ;
Huang, Li ;
Liang, Yongfeng ;
Ye, Feng ;
Lin, Junpin ;
Shang, Shunli ;
Liu, Zikui .
JOURNAL OF ALLOYS AND COMPOUNDS, 2015, 618 :192-196
[24]   HREM study and structure modeling of the η′ phase, the hardening precipitates in commercial Al-Zn-Mg alloys [J].
Li, XZ ;
Hansen, V ;
Gjonnes, J ;
Wallenberg, LR .
ACTA MATERIALIA, 1999, 47 (09) :2651-2659
[25]   Fine precipitation scenarios of AlZnMg(Cu) alloys revealed by advanced atomic-resolution electron microscopy study Part I: Structure determination of the precipitates in AlZnMg(Cu) alloys [J].
Liu, J. Z. ;
Chen, J. H. ;
Yuan, D. W. ;
Wu, C. L. ;
Zhu, J. ;
Cheng, Z. Y. .
MATERIALS CHARACTERIZATION, 2015, 99 :277-286
[26]   Formation of solute nanostructures in an Al-Zn-Mg alloy during long-term natural aging [J].
Liu, Jizi ;
Hu, Rong ;
Zheng, Jialing ;
Zhang, Yidong ;
Ding, Zhigang ;
Liu, Wei ;
Zhu, Yuntian ;
Sha, Gang .
JOURNAL OF ALLOYS AND COMPOUNDS, 2020, 821
[27]   Formation of β"-related composite precipitates in relation to enhanced thermal stability of Sc-alloyed Al-Mg-Si alloys [J].
Liu, Y. ;
Lai, Y. X. ;
Chen, Z. Q. ;
Chen, S. L. ;
Gao, P. ;
Chen, J. H. .
JOURNAL OF ALLOYS AND COMPOUNDS, 2021, 885
[28]   Effect of cooling aging on microstructure and mechanical properties of an Al-Zn-Mg-Cu alloy [J].
Liu, Yan ;
Jiang, Daming ;
Li, Bingqing ;
Yang, Wenshu ;
Hu, Jie .
MATERIALS & DESIGN, 2014, 57 :79-86
[29]   The effects of a trace addition of silver upon elevated temperature ageing of an Al-Zn-Mg alloy [J].
Maloney, SK ;
Hono, K ;
Polmear, IJ ;
Ringer, SP .
MICRON, 2001, 32 (08) :741-747
[30]   Atomic structure of hardening precipitates in an Al-Mg-Zn-Cu alloy determined by HAADF-STEM and first-principles calculations: relation to η-MgZn2 [J].
Marioara, Calin D. ;
Lefebvre, Williams ;
Andersen, Sigmund J. ;
Friis, Jesper .
JOURNAL OF MATERIALS SCIENCE, 2013, 48 (10) :3638-3651
12345