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
Wenjun Ci, Xianhua Chen, Yue Sun, Xu Dai, Guanzheng Zhu, Di Zhao, Fusheng Pan
Summary: The study investigates the impact of different Zn concentrations on the microstructure, corrosion property, and mechanical property of Mg-0.3Sc-xZn alloys. MSZ1 alloy exhibits the highest corrosion resistance and appropriate mechanical properties. The corrosion resistance of Mg-0.3Sc-1Zn alloys is attributed to the homogeneous volta-potential distribution and dense corrosion product film.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Chijioke Kenneth Akuata, Feliksianus Robby Gunawan, Piyada Suwanpinij, Daniela Zander
Summary: The effect of a single addition of 0.1 wt.% Cr on the microstructure evolution and localized corrosion susceptibility of an Al-Zn-Mg-Cu-Zr (7449) alloy was systematically investigated. The addition of 0.1 wt.% Cr resulted in a decrease in recrystallized fraction due to the formation of Cu- and Zn-containing E (Al18Mg3Cr2) dispersoids and larger as-cast grain size. Additionally, the formation of Cu- and Zn-containing E (Al18Mg3Cr2) dispersoids and eta Mg(Zn,Cu,Al)(2) phase depleted alloying elements from solid solution and affected grain-boundary precipitation.
Article
Chemistry, Multidisciplinary
Jinshu Xie, Jinghuai Zhang, Shujuan Liu, Zihao You, Zhi Zhang, Tengfei Zhao, Xiaobo Zhang, Ruizhi Wu
Summary: A high-performance Mg-10Gd-4Dy-1.5Ag-1Zn-0.5Zr (wt.%, EQ142X) alloy was designed using multi-element composite addition, resulting in high yield strength (approx. 396 MPa) and ultimate tensile strength (approx. 451 MPa) after hot extrusion and ageing. The high strength is attributed to fine grains and nano-precipitates, especially beta' and gamma nano-precipitates, which act as the main strengthening phases. The introduction of nano-precipitates network into the fine-grained structure is proposed as an effective strategy for developing high-strength Mg alloys.
Review
Materials Science, Multidisciplinary
Pavel Predko, Dragan Rajnovic, Maria Luisa Grilli, Bogdan O. Postolnyi, Vjaceslavs Zemcenkovs, Gints Rijkuris, Eleonora Pole, Marks Lisnanskis
Summary: Magnesium alloys are in high demand in various industries due to their high specific strength characteristics, but their applicability in aggressive environments is limited by their high chemical reactivity. Effective technologies for corrosion protection are urgently needed to ensure the use of magnesium-containing structures in various fields. Recent advancements in protective coatings using different deposition techniques have been made, enhancing the corrosion resistance of magnesium alloys.
Article
Engineering, Biomedical
Claudia Garcia-Mintegui, Laura Catalina Cordoba, Judit Buxadera-Palomero, Andrea Marquina, Emilio Jimenez-Pique, Maria-Pau Ginebra, Jose Luis Cortina, Marta Pegueroles
Summary: This study investigates the mechanical properties, biodegradability and biocompatibility of Zn-Mg and Zn-Cu alloys for potential use in bioresorbable cardiovascular stents. The addition of Mg or Cu alloying elements refines the microstructure of Zn while improving yield strength and ultimate tensile strength. Both Zn-1Mg and Zn-Cu alloys showed promising results in terms of degradation stability and antibacterial effects.
BIOACTIVE MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Kui Wang, Xinwei Wang, Cong Dang, Shaozhu Wang, Song Huang, Manping Liu, Jingfeng Wang
Summary: Ultrahigh-strength Mg-9.2Gd-4.4Y-1.0Zn-0.8Mn (wt%) alloys were produced through isothermal ageing, resulting in a microstructure characterized by bimodal a-Mg grains and prismatic b' and basal g' phases precipitated during ageing. The peak-aged alloys exhibited the highest tensile strength, with satisfactory ductility, due to dense number distribution co-precipitation that increased critical resolved shear stresses and inhibited microcrack nucleation and propagation. These findings have significant implications for high-strength Mg-Gd-Y-Zn alloys in practical applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Marti Lopez Freixes, Xuyang Zhou, Raquel Aymerich-Armengol, Miquel Vega-Paredes, Lionel Peguet, Timothy Warner, Baptiste Gault
Summary: Crack growth in stress corrosion cracking (SCC) in 7xxx Al alloys is an intermittent process. When crack propagation stops, hydrogen (H) is generated at the crack tip, facilitating further crack advancement through hydrogen embrittlement. CAMs are produced through oxidation at the arrested crack tip, with matrix precipitates dissolving and solute diffusing towards the growing CAM. Residual strain beneath the fracture surface indicates non-localized plastic activity. Findings suggest that H induces crack propagation through decohesion.
SCRIPTA MATERIALIA
(2023)
Article
Crystallography
Lavinia Dragomir (Nicolescu), Iulian Antoniac, Veronica Manescu (Paltanea), Aurora Antoniac, Marian Miculescu, Octavian Trante, Alexandru Streza, Cosmin Mihai Cotrut, Doriana Agop Forna
Summary: This study focuses on the corrosion behavior of two Mg-Zn-Ag alloys (Mg7Zn1Ag and Mg6Zn3Ag) and the Mg1Ca alloy. The experimental results show that simulated body fluid solution (SBF) exhibits a more corrosive nature, and alloys with a higher percentage of silver (2.5 wt.%) demonstrate better corrosion resistance. We consider that the magnesium alloy Mg6Zn3Ag has valuable biodegradation characteristics that can be considered as raw materials for manufacturing small trauma implants.
Article
Materials Science, Multidisciplinary
Polina Metalnikov, Guy Ben-Hamu, Kwang Seon Shin
Summary: This study investigated the effect of varying Zn additions on the corrosion resistance of wrought Mg-5Al alloys, identifying three secondary phases that contribute to changes in the corrosion behavior. While short periods of immersion are characterized by pitting corrosion, long periods lead to the formation of a protective layer and filiform corrosion in alloys with higher Zn content. The micro-galvanic effects continue to play a crucial role in deteriorating corrosion resistance in alloys with relatively high Zn content, depending on the behavior of the cathodic particles and their total number on the alloy's surface.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Chiamaka Okafor, Amit Datye, Shuhan Zhang, Udo D. Schwarz, Yong Cai, Norman Munroe
Summary: This study successfully improved the mechanical and degradation properties of Mg-based bioresorbable stent materials by incorporating lithium. The enhancement was achieved through the reduction of secondary phases, formation of a lithium carbonate surface coating, and phase transformation.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Sohail Shah, Akash Gopal, Elisabeth Thronsen, Constantinos Hatzoglou, Bjorn Holmedal
Summary: Comparison between natural and artificial ageing treatments with cyclic deformation ageing at room temperature revealed different fracture behaviors and mechanical responses for Al-Zn-Mg alloys. Cyclic ageing resulted in early slant shear fracture, while natural ageing improved mechanical properties.
MATERIALS & DESIGN
(2022)
Article
Metallurgy & Metallurgical Engineering
Ke Liu, Feng Lou, Jun-jian Fu, Zi-jian Yu, Shu-bo Li, Zhao-hui Wang, Xian Du, Wen-bo Du
Summary: The corrosion behaviors and mechanism of Mg-xZn-0.5Er (x = 0.5, 2.0, 3.0 and 4.0, in wt.%) alloys were investigated. The potential difference between the second phase and matrix was determined by the type and size of the second phases. The dominated nano-scale W-phase on the matrix induced sharp local pitting corrosion, while an increase in the volume fraction of the coarse W-phase or I-phase resulted in preferential corrosion around them, leading to obvious uniform corrosion and an accelerated corrosion rate.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Materials Science, Multidisciplinary
B. Wei, D. Legut, S. Sun, H. T. Wang, Z. Z. Shi, H. J. Zhang, R. F. Zhang
Summary: The study found that certain elements can reduce the degradation rates of both Mg-based and Zn-based alloys, while others will have the opposite effect. Additionally, both tensile and compressive strains can accelerate degradation rates by reducing the activation energy barrier.
Article
Nanoscience & Nanotechnology
Sohail Shah, Elisabeth Thronsen, Constantinos Hatzoglou, Sigurd Wenner, Calin D. Marioara, Randi Holmestad, Bjorn Holmedal
Summary: Cyclic ageing at room temperature enhances the mechanical properties of aluminum alloys by continuously injecting vacancies and enabling the dynamic precipitation of fine solute clusters. These clusters, uniformly distributed throughout the material, exhibit structural similarities to GPI zones observed after low temperature ageing. The strengthening effect of solute clusters is accelerated during cyclic ageing compared to natural ageing.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Wenbin Tu, Jianguo Tang, Yong Zhang, Lingying Ye, Shengdan Liu, Jinkun Lu, Xin Zhan, Chengbo Li
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2020)
Article
Materials Science, Multidisciplinary
Zhimin Ma, Jia Liu, Zhenshen Yang, Shengdan Liu, Yong Zhang
MATERIALS CHARACTERIZATION
(2020)
Article
Chemistry, Physical
Bin Ke, Lingying Ye, Jianguo Tang, Yong Zhang, Shengdan Liu, Huaqiang Lin, Yu Dong, Xiaodong Liu
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Materials Science, Multidisciplinary
Wenbin Tu, Jianguo Tang, Lingying Ye, Lingfei Cao, Yu Zeng, Qianqian Zhu, Yong Zhang, Shengdan Liu, Lehang Ma, Jinkun Lu, Bing Yang
Summary: The addition of Sn suppresses the natural aging of Al-0.4Mg-1.0Si alloy, but short natural aging time has a positive effect on the subsequent artificial aging, resulting in a fast hardening rate.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Menghan Zhang, Chengbo Li, Yong Zhang, Shengdan Liu, Jingyu Jiang, Jianguo Tang, Lingying Ye, Xinming Zhang
Summary: The study found that the alloy after hot deformation has a different microstructure compared to the one without hot deformation, with more recrystallized grains and subgrains, accompanied by a higher amount of quenching-induced phases. Furthermore, it was observed that hot deformation has a significant impact on the microstructure and precipitation behavior of the alloy.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Lingying Ye, Xiaodong Liu, Jianguo Tang, Shengdan Liu, Yong Zhang
Summary: In an Al-Mg-Li alloy, S-1 phase precipitates in rod-shaped morphology at 300 degrees C, which are not dissolved until coarsening is finished at 400 degrees C. The dissolution of small precipitates and spheroidization of the rod-shaped precipitates reduce the total precipitate-matrix interface energy, providing the driving force for coarsening.
Article
Materials Science, Multidisciplinary
Jinkun Lu, Haichun Jiang, Lingying Ye, Daxiang Sun, Yong Zhang, Xin Zhan, Yuping Li, Lehang Ma, Qingrong Ran, Jianguo Tang
Summary: The study found that the aging time of Al-0.5Mg-0.4Si alloy affects both the localized deformation ductility index and crushing performance, with the two showing the same trend. By adjusting the spacing of Grain Boundary Precipitates, the ductility of the alloy can be increased to improve crushing performance.
Article
Materials Science, Multidisciplinary
Mingyang Chen, Xu Zheng, Kezhun He, Shengdan Liu, Yong Zhang
Summary: The corrosion behavior of quenching-induced eta precipitates in Al-Zn-Mg-Cu alloy was studied, showing that these precipitates act as cathodes triggering corrosion. With decreasing quenching rate, the corrosion morphology changes. After artificial ageing, Zn and Mg atoms migrate into precipitates, enhancing corrosion resistance of aged samples.
Article
Chemistry, Physical
Bin Ke, Lingying Ye, Yong Zhang, Jianguo Tang, Shengdan Liu, Xiaodong Liu, Yu Dong, Ping Wang
Summary: The new variable-rate non-isothermal aging process can achieve higher strength and excellent corrosion resistance by using different heating/cooling rates in different temperature ranges. A higher percentage of fully grown but not coarsened precipitates were obtained within the grains, and the distribution of grain boundary precipitates was discontinuous.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
Zhi-min Ma, Yong Zhang, Sheng-dan Liu, Yun-lai Deng, Xin-ming Zhang
Summary: The quenching sensitivity of AA7136 alloy was studied using time-temperature-property (TTP) diagrams, and the heterogeneous precipitation behavior during isothermal holding was investigated. The precipitation of different phases depending on temperature and time was described in a time-temperature-precipitation diagram. The increase in phase particles during isothermal holding resulted in decreased hardness after aging, with a discussion on the quantitative contribution of grain boundaries/subgrain boundaries and dispersoids to the loss of hardness.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Materials Science, Multidisciplinary
Zhimin Ma, Jia Liu, Shengdan Liu, Yong Zhang, Yunlai Deng
Summary: The exfoliation corrosion behavior of an AlZnMgCu alloy extruded plate changes from layered features to wavy features with the decrease of quenching rate, due to the increase of corroded low angle grain boundaries and rapid development of corrosion along the thickness direction. This change is explained by the quench-induced change of precipitation features at high angle grain boundaries and low angle grain boundaries.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Baoshuai Han, Xu Zheng, Wei Wang, Yong Zhang, Yanjin Xu, Kezhun He, Yuansong Zeng, Xinming Zhang
Summary: This study investigates the comprehensive properties of an Al-Zn-Mg-Cu alloy using a novel heat treatment. The results demonstrate that the alloy achieves the highest fracture toughness and critical stress intensity factor compared to other alloys. Additionally, the fatigue strength of the heat-treated alloy is significantly higher than similar alloys. This superior performance is attributed to the presence of deformed grain structures and age hardening precipitates.
Article
Materials Science, Multidisciplinary
Xu Zheng, Jianguo Tang, Li Wan, Yan Zhao, Chuanrong Jiao, Yong Zhang
Summary: The hot-deformation behavior of medium-strength Al-Zn-Mg alloys with different Zn/Mg ratios was studied, and series-processing maps were constructed. The results showed that alloys with a lower Zn/Mg ratio exhibited problematic hot-deformation capability, while alloys with a higher Zn/Mg ratio showed better workability. The Al3Zr dispersoids had an inhibiting effect on recrystallization, and the Zn/Mg ratios could potentially affect the drag force of the dispersoids.
Article
Chemistry, Physical
Xu Zheng, Yi Yang, Jianguo Tang, Baoshuai Han, Yanjin Xu, Yuansong Zeng, Yong Zhang
Summary: This paper investigates the effect of retrogression time on the fatigue crack growth of a modified AA7475 aluminum alloy. Tests including tensile strength, fracture toughness, and fatigue limits were performed to understand the changes in properties with different retrogression procedures at 180 degrees C. The microstructure was characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The findings indicated that as the retrogression time increased, the yield strength decreased from 508 MPa to 461 MPa, whereas the fracture toughness increased from 48 MPavm to 63.5 MPavm. The highest fracture toughness of 63.5 MPavm was seen after 5 h of retrogression. The measured diameter of ?' precipitates increased from 6.13 nm at the retrogression 1 h condition to 6.50 nm at the retrogression 5 h condition. Prolonged retrogression also increased the chance of crack initiation, with slower crack growth rate in the long transverse direction compared to the longitudinal direction. An empirical relationship was established between fracture toughness and the volume fraction of age-hardening precipitates, with increasing number density of precipitates seen with increasing retrogression time.
Article
Materials Science, Multidisciplinary
Li Ya, Deng Yun-lai, Zhang Jin, Tian Ai-qin, Zhang Yong
CAILIAO GONGCHENG-JOURNAL OF MATERIALS ENGINEERING
(2020)