Article
Materials Science, Multidisciplinary
Yifu Jiang, Siyang Xu, Shuang Gao
Summary: The influence of initial alloy temper on corrosion resistance for Al-Zn-Mg-Cu alloy was investigated. The results showed that specimens after pre-ageing and simulated baking treatment exhibited high strength and improved inter-granular corrosion resistance.
Article
Materials Science, Multidisciplinary
Huilong Zhong, Shengci Li, Jiali Wu, Hongling Deng, Jiqiang Chen, Na Yan, Zixin Chen, Liangbo Duan
Summary: The study investigates the effects of different RRA treatments on the microstructure, mechanical properties, and corrosion resistance of a Zr + Er modified Al-Zn-Mg-Cu alloy. It is found that controlling the regression time and temperature can regulate the characteristics of precipitated phases, leading to an optimal balance of mechanical properties and corrosion resistance.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Manufacturing
Tian-Jun Bian, Heng Li, Chao Lei, Chang-Hui Wu, Li-Wen Zhang
Summary: Electrically assisted creep aging (ECA) is a promising forming technology for integral panels, which can achieve a three-step aging process (RRA) to tailor the needed properties balance.
ADVANCES IN MANUFACTURING
(2022)
Article
Nanoscience & Nanotechnology
Yukuan Huang, Yu Liu, Zhengbing Xiao, Yuanchun Huang
Summary: This study investigates the effects of silver alloying and retrogression re-aging heat treatment on the mechanical properties and electrical conductivity of the Al-Zn-Mg-Cu aluminum alloy. A trade-off between mechanical strength and electrical conductivity is achieved, and the heat treatment promotes the precipitation of the second phase, improving both the strength and conductivity of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Zhen Zhang, Zhifei Hao, Hongbin Wang, Di Zhang, Jishan Zhang
Summary: A novel design strategy for stress corrosion cracking-resistant aluminum alloys is proposed in this study, which improves the resistance to corrosion by optimizing the microstructure and microstress distribution.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Metallurgy & Metallurgical Engineering
Peng Nan-hui, Zhan Li-hua, Ma Bo-lin, Wang Qing, Xu Ling-zhi, Yu Wen-fang, Shen Feng
Summary: This study aimed to investigate the impact of regression aging time and regression aging temperature on the creep aging properties of Al-Zn-Mg-Cu alloy. Key findings include the maximum steady creep strain observed at specific conditions and the enhancement of alloy properties, such as electrical conductivity and stress corrosion cracking resistance, after regression aging.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Nanoscience & Nanotechnology
Zhaogang Zhang, Xinwu Ma, Cunsheng Zhang, Guannan Chu, Zijie Meng, Guoqun Zhao, Liang Chen
Summary: This study systematically investigated the effect of stress-aging treatment (SAT) on an Al-Zn-Mg-Cu alloy. It was found that SAT increased the number and reduced the size of matrix precipitates, resulting in higher strength and corrosion resistance in the alloy. Additionally, the presence of large-sized and discontinuous grain boundary precipitates hindered the dissolution of grain boundaries and the propagation of stress corrosion cracking (SCC), improving the alloy's corrosion resistance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Industrial
Lingzhi Xu, Lihua Zhan, Yongqian Xu, Chunhui Liu, Minghui Huang
Summary: The proposed thermomechanical pretreatment technique improves the formability and comprehensive properties of Al-Zn-Mg-Cu alloys subjected to creep-age forming (CAF) processing, with thermomechanically pretreated samples showing greater creep deformation compared to samples treated only with traditional methods.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Guoqiang Zhang, Renbo Song, Junyou Liu, Shuai Zhao, Changhong Cai
Summary: The effect of Mg content on structure and corrosion behavior of novel Hot-dip 55Al-Zn-1.5Si-0.08RE-xMg (wt.%) coatings was investigated. The addition of Mg led to the formation of double-layer or even triple-layer dendrites and generated MgZn2 and Mg2Si phases. Additionally, Mg promoted the conversion of corrosion product film and slowed down the corrosion of Al-rich dendrites. The coating with 1.0 wt% Mg content exhibited the smallest dendrite structure, the most protective corrosion product film, and the best corrosion resistance.
Article
Materials Science, Multidisciplinary
Fuqiang Guo, Shuwei Duan, Yuzhe Pan, Dongting Wu, Kenji Matsuda, Tao Wang, Yong Zou
Summary: The stress corrosion cracking (SCC) behavior of Al-Zn-Mg-Cu alloys in different aging treatment states was dynamically studied by slow strain rate tensile (SSRT) combining in-situ electrochemical impedance spectroscopy (EIS). It was found that the stress corrosion process can be divided into three stages, and the corresponding charge transfer resistance (Rct) shows three evolutionary patterns. The regression re-aging (RRA) treatment improved the SCC resistance of alloys significantly by obtaining coarse and discrete grain boundary precipitates (GBPs) with higher Cu content.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Yongxin Jia, Ruiming Su, Hongyu Liao, Guanglong Li, Yingdong Qu, Rongde Li
Summary: The microstructure, mechanical properties, and wear resistance of Al-Cu-Mg alloy after each stage of RRA treatment were studied. The results showed that the optimal mechanical properties and wear resistance can be achieved under specific RRA conditions. It was also discovered that under-aging during pre-aging promotes the redissolution of S phases, and an appropriate retrogression time benefits the formation of more and finer S phases after RRA treatment.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Fuqiang Guo, Shuwei Duan, Yuzhe Pan, Dongting Wu, Kenji Matsuda, Tao Wang, Yong Zou
Summary: The stress corrosion evolution of friction stir welding joints of Al-Zn-Mg-Cu alloy was studied during slow strain rate tensile testing using in-situ electrochemical impedance spectroscopy. The slow stress corrosion process can be divided into three stages based on the corrosion trend, with corresponding charge-transfer resistance showing three evolutionary patterns. The grain boundary precipitates in the thermal machine affected zone (TMAZ) of the pre-weld RRA treatment are more discrete and coarser, with a higher Cu content, reducing the potential difference with the surrounding substrate and exhibiting higher stress corrosion resistance.
Article
Materials Science, Multidisciplinary
Hui Zhao, Lingying Ye, Quanshi Cheng, Yuan Kang, Wenjing Zhang
Summary: Variable rate non-isothermal aging (VR-NIA) treatment was proposed and applied to optimize the mechanical properties and corrosion resistance of 7055 aluminum alloy. The VR-NIA treated alloy exhibited enhanced hardness, tensile strength, electrical conductivity, and improved corrosion resistance.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Shengxian Li, Yihong Wu, Wei Wang, Xuejian Wang, Huijun Kang, Enyu Guo, Jiehua Li, Yanjin Xu, Zongning Chen, Tongmin Wang
Summary: In this study, the effects of retrogression and re-aging (RRA) treatment and nanoparticle incorporation on the stress corrosion crack (SCC) behavior of 7075 aluminum alloy were investigated. The results showed that both RRA treatment and nanoparticle incorporation improved the SCC resistance of 7075 alloy.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Ting-Jung Hsiao, Po-Han Chiu, Cheng-Lin Tai, Tzu-Ching Tsao, Chien-Yu Tseng, Yi-Xian Lin, Hsueh-Ren Chen, Tsai-Fu Chung, Chih-Yuan Chen, Shing-Hoa Wang, Jer-Ren Yang
Summary: In this study, artificial aging treatments were performed on Al-5.98Zn-2.86Mg-1.61Cu alloy and Al-5.91Zn-2.83Mg-1.98Cu alloy after solid solution treatment. It was found that the optimal strengths were achieved after artificial aging at 120 degrees C for 24 h for both alloys. The average sizes and number density of the major strengthening precipitates, eta', were calculated using transmission electron microscopy (TEM) images and electron energy loss spectroscopy (EELS).
Article
Materials Science, Multidisciplinary
Fuqiang Guo, Shuwei Duan, Yuzhe Pan, Dongting Wu, Kenji Matsuda, Tao Wang, Yong Zou
Summary: The stress corrosion evolution of friction stir welding joints of Al-Zn-Mg-Cu alloy was studied during slow strain rate tensile testing using in-situ electrochemical impedance spectroscopy. The slow stress corrosion process can be divided into three stages based on the corrosion trend, with corresponding charge-transfer resistance showing three evolutionary patterns. The grain boundary precipitates in the thermal machine affected zone (TMAZ) of the pre-weld RRA treatment are more discrete and coarser, with a higher Cu content, reducing the potential difference with the surrounding substrate and exhibiting higher stress corrosion resistance.
Article
Polymer Science
Fuqiang Guo, Shuwei Duan, Dongting Wu, Kenji Matsuda, Tao Wang, Yong Zou
Summary: In this article, a high corrosion-resistant and environmentally stable superhydrophobic layer was fabricated on the surface of 7055 aluminum alloy. This was achieved by surface silanization and constructing a secondary micro-nano structure with polytetrafluoroethylene and SiO2 nanoparticles on the polydimethylsiloxane surface. The superhydrophobic layer exhibited excellent hydrophobic properties, long-lasting stability, corrosion resistance, wear resistance, and antiicing performance, which were discussed in detail.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Shuwei Duan, Yuan Yang, Tao Wang, Fuqiang Guo, Kenji Matsuda, Yong Zou
Summary: The precipitation characteristics of the Al-Cu-Li alloys were compared under different processing states, with a focus on the presence or absence of thermoplastic deformation. Samples of the alloy in different processing states were prepared, and the precipitation behavior during aging at 200 degrees C was examined. The study found that the processing states significantly influenced the precipitation dynamics and characteristics of the alloy, with variations in the types of precipitates and the density and size of the main strengthening phase.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Jinqiu Liu, Fuqiang Guo, Tao Wang, Shuwei Duan, Yong Zou
Summary: The variation of corrosion resistance in narrow areas of FSW joints is difficult to characterize due to large temperature gradient. This study performed welding thermal simulation to simulate the HAZ and TMAZ of FSW 7075-T6 aluminum alloy, and studied the corrosion resistance and microstructure of the simulated samples. Results showed that corrosion potential changed significantly under different thermal simulation temperatures. The corrosion mechanism of HAZ and TMAZ were completely inconsistent, which was related to differences in precipitate and grain characteristics.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Materials Science, Multidisciplinary
Shuwei Duan, Zhongli Liu, Fuqiang Guo, Yuzhe Pan, Kenji Matsuda, Yong Zou
Summary: The aging precipitation behavior and its effects on the mechanical properties of a novel cast Al-Cu-Li alloy were investigated. It was found that during artificial aging, various phases precipitate sequentially, with the T1 phase and cubic phase showing excellent thermal stability. After aging, the alloy's tensile strength increases to 423 MPa, but the elongation decreases significantly.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Shuaishuai Qin, HuiXu Zhou, Xu Huang, Weidong Huang, Guanglei Lin, Taiki Tsuchiya, Seungwon Lee, Kenji Matsuda
Summary: Boundaries are often observed within grains during homogenization/solution cooling of Al-Mg-Si billets. This study confirmed that the formation of these boundaries is caused by a complex but interesting heterogeneous precipitation behavior. This behavior includes both high temperature and low temperature stages, with the latter being rarely observed during aging treatment with deformation induced dislocations. During the high temperature stage (>350 degrees C) of cooling, rod/lath-like precipitates formed at dislocations tend to grow along two or three (100)Al directions; however, as the temperature decreases to around 200 degrees C, the precipitates tend to align and parallel to each other, and string-like precipitates appear along the dislocations between the precipitates.
Article
Materials Science, Multidisciplinary
Tomohito Tsuru, Katsuhiko Nishimura, Kenji Matsuda, Noiro Nunomura, Takahiro Namiki, Seungwon Lee, Wataru Higemoto, Teiichiro Matsuzaki, Masatake Yamaguchi, Kenichi Ebihara, Kazuyuki Shimizu, Hiroyuki Toda
Summary: Although the hydrogen embrittlement susceptibility of high-strength Al alloys is a critical issue in their practical use, identifying hydrogen trapping or distribution has been challenging. In this study, an effective approach based on experiment and simulation is proposed to explore potential trap sites in Al alloys. Zero-field muon spin relaxation experiments were carried out in the temperature range of 5 K to 300 K, providing characteristic peaks corresponding to hydrogen trapping. The atomic configurations of the muon trapping sites were determined using first-principles calculations, enabling the exploration of potential alloying elements with strong binding energies with hydrogen in Al alloys.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Jinqiu Liu, Fuqiang Guo, Kenji Matsuda, Tao Wang, Yong Zou
Summary: This study investigates the effects of compressive pre-deformation and successive pre-artificial aging on the compressive creep aging behavior and microstructure evolution of Al-Cu-Li alloy. It was found that severe hot deformation mainly occurs near the grain boundaries during compressive creep, which later extends to the grain interior. Different precipitation situations exist for different levels of pre-deformation. Increasing the pre-deformation level is more effective in decreasing the total creep strain than pre-aging.
Article
Materials Science, Multidisciplinary
Yuzhe Pan, Shuwei Duan, Fuqiang Guo, Kenji Matsuda, Tao Wang, Yong Zou
Summary: In this article, a novel cryogenic-aging treatment was implemented by introducing deep cryogenic treatment (DCT) prior to artificial aging. The stress corrosion performance of Al-Zn-Mg-Cu alloy after cryogenic-aging treatment was investigated through mechanical properties testing, in-situ electrochemical testing, and microstructure analysis. It was observed that the optimal parameters were DCT-8h and 24h prior to double-stage aging treatment. Cryogenic-aging treatment extended the lifespan of the alloy under stress and corrosion media coupling. Furthermore, it promoted the multiplication of dislocations on the grain boundary or sub-grain boundary, which provided nucleation sites for precipitates and reduced the width of the precipitates-free zone (PFZ). The inhibition mechanism of stress corrosion by cryogenic-aging treatment was analyzed through in-situ electrochemical testing and microstructure observation, effectively preventing oxide film rupture and crack propagation. This study presents a simple and efficient process for enhancing stress corrosion performance, which has significant implications for the application of Al-Zn-Mg-Cu alloys in aerospace and transportation industries.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Shuwei Duan, Yumin Wang, Zhongli Liu, Fuqiang Guo, Kenji Matsuda, Yong Zou
Summary: This study focused on investigating the characteristics of grain boundary T1 precipitate in a rolled Al-Cu-Li alloy. It was found that the T1 phase with a multilayer structure will precipitate at the grain boundary after artificial aging, and it is nearly continuously distributed along grain boundaries in the pre-rolled samples. The habit plane of the intergranular T1 normally parallels a (111) plane of the matrix on one side of the grain boundary.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Fuqiang Guo, Shuwei Duan, Yuzhe Pan, Dongting Wu, Kenji Matsuda, Tao Wang, Yong Zou
Summary: The stress corrosion cracking (SCC) behavior of Al-Zn-Mg-Cu alloys in different aging treatment states was dynamically studied by slow strain rate tensile (SSRT) combining in-situ electrochemical impedance spectroscopy (EIS). It was found that the stress corrosion process can be divided into three stages, and the corresponding charge transfer resistance (Rct) shows three evolutionary patterns. The regression re-aging (RRA) treatment improved the SCC resistance of alloys significantly by obtaining coarse and discrete grain boundary precipitates (GBPs) with higher Cu content.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Taiki Tsuchiya, Kanokwan Uttarasak, Seungwon Lee, Abrar Ahmed, Sarka Mikmekova, Katsuhiko Nishimura, Norio Nunomura, Kazuyuki Shimizu, Kyosuke Hirayama, Hiroyuki Toda, Masatake Yamaguchi, Tomohito Tsuru, Junya Nakamura, Susumu Ikeno, Kenji Matsuda
Summary: The hexagonal tabular ss-Mg2Si phase (hex-ss) co-existed with conventional truncated octagonal shaped ss-Mg2Si (con-ss) in the Al-1.0 mass% Mg2Si alloy containing NMEs at the over-aged condition. The formation of hex-ss was suggested to be related to defects in the Al-matrix. There is no significant difference in the lattice parameter of ss-Mg2Si by added NMEs.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Yongpeng Tang, Toshiki Fujii, Shoichi Hirosawa, Kenji Matsuda, Daisuke Terada, Zenji Horita
Summary: This study demonstrates that the tensile strength and ductility of A1050 commercial-purity aluminum can be improved using the processes of accumulative roll bonding and high-pressure sliding. The increase in strength is attributed to significant grain refinement and well-defined grain boundaries.
MATERIALS TRANSACTIONS
(2023)
Article
Metallurgy & Metallurgical Engineering
R. Gawel, L. Rogal, K. Przybylski, Kenji Matsuda
Summary: This work conducted initial investigations on the oxidation behaviour and phase transformations of equimolar AlCoCrCuNi high entropy alloy with and without 1 at.% silicon addition during 24-hr exposure to air atmosphere at 1273 K. The oxidation kinetics of the samples were determined using thermogravimetric analysis, while the morphology, chemical and phase compositions of the oxidized alloys were analyzed using scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction analysis. The additional cross-section studies were performed using transmission electron microscopy combined with energy dispersive X-ray spectroscopy and selected area electron diffraction. The results indicate that the addition of minor silicon improves the oxidation kinetics and inhibits the formation of an additional FCC structure near the surface of the material.
ARCHIVES OF METALLURGY AND MATERIALS
(2022)
