Article
Nanoscience & Nanotechnology
Chenglu Tang, Binghui Luo, Zhenhai Bai, Wenfeng Mo, Pan Deng
Summary: The study found that the non-isothermal ageing and conventional T6 treatments have an impact on the strength and elongation properties of the Al-Cu-Mg-Ag alloy, mainly due to the variation in PFZs width and microstructural parameters of omega phases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Metallurgy & Metallurgical Engineering
Xiao-feng Wang, Ming-xing Guo, Wen-fei Peng, Yong-gang Wang, Lin-zhong Zhuang
Summary: The experimental results reveal a non-monotonic relationship between solution heating rate, mechanical properties, microstructure, and texture of the Al-Mg-Si-Cu alloy. Increasing heating rate affects strength, work hardening, plastic strain ratio, microstructure transformation, and texture intensity in a complex manner. Both microstructure and texture evolutions are weakly affected by heating rate, indicating that improving heating rate may not always be favorable for certain material properties.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Materials Science, Multidisciplinary
Hyeongsub So, Jae-Hong Shin, Leeseung Kang, Chanuk Jeong, Kyou-Hyun Kim
Summary: The effect of solution temperature (T-sol. = 440-530 degrees C) on the mechanical properties of Al-3.4Cu-0.34Mg-0.3Mn-0.17Ag alloy was investigated. It was found that the alloy showed the highest mechanical strength of sigma(UTS) = ~329 MPa at a T-sol. value of 470 degrees C. The microstructural investigation revealed that the different mechanical properties at different T-sol. values were attributed to grain growth, precipitation hardening, and the formation of large particles at the grain boundaries. The relationships between the microstructural evolution and the mechanical properties were explored with respect to different values of T-sol.
Article
Chemistry, Physical
Ziyao Zhao, Namin Xiao, Zhihao Zhang, Zhilei Wang
Summary: A deliberate pre-annealing followed by solution-aging treatment was proposed to improve the stress relaxation stability of a heat-resistant aluminum alloy. The peak effect on stress relaxation stability was found at a pre-annealing temperature of 325℃, which was attributed to a good balance of recrystallization and precipitation. This heat treatment method provides a route for developing high-performance heat-resistant aluminum alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Y. K. Xiao, Q. Yang, Z. Y. Bian, H. Chen, Y. Wu, Q. Lian, Z. Chen, H. W. Wang
Summary: Selective laser melting (SLM) of aluminium alloys is a research focus for fabricating complex components in aerospace and automotive industries. This study demonstrated the effects of post heat treatment on microstructures and mechanical properties, showing that SLMed TiB2/Al-7Si-Cu-Mg samples can achieve appropriate mechanical properties through post-heat treatments.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Hyeongsub So, Sung-Jae Won, Jihoon Park, Soong Ju Oh, Leeseung Kang, Kyou-Hyun Kim
Summary: This study investigated the effect of different CuxMgx/10 content in Al-Cu-Mg-based alloys, with Cu6.0Mg0.60 alloy showing the highest mechanical properties. The amount of CuxMgx/10 solutes influences the macroscopic and microscopic structures of the fabricated alloys, with higher content leading to grain size refinement and accelerated formation of theta' strengthening phase. Additionally, a higher content of CuxMgx/10 induces significant microscopic structural distortion, impacting the tensile properties of the developed alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Zhou Yang, Meilin Zhang, Longyi Fan, Jingyuan Bai, Xiaolin Chen, Jin Zhang, Zheng Li, Renguo Guan
Summary: The effect of Fe and Ni content, solution treated, and aged process on the microstructure and mechanical properties of Al-Cu-Mg-Fe-Ni alloys were investigated by OM, SEM, hardness and tensile tests. TEM and high-resolution TEM were used to determine the existence of S phase and Al9FeNi precipitates. The solution treatment followed by aged process was found to significantly improve the tensile properties of the alloy at both room and elevated temperature.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Mingdong Wu, Daihong Xiao, Xinkai Wang, Lanping Huang, Wensheng Liu
Summary: The effects of Zn contents on the mechanical properties, corrosion behaviors, and microstructural evolution of extruded Al-Li-Cu-Mg-Ag alloys were investigated. Increasing Zn contents can accelerate hardening kinetics, improve hardness, and enhance corrosion resistance. The addition of 0.57 wt.% Zn to the alloy showed the best combination of tensile strength and corrosion resistance.
Article
Chemistry, Physical
Fuqing Jiang, Lei Tang, Sheng Li, Hengqiang Ye, Moataz M. Attallah, Zhiqing Yang
Summary: A crack-free, strong and ductile Al-Cu-Mg-Ag alloy with TiB2 particles was successfully fabricated using laser powder bed fusion (L-PBF). The microstructure of the alloy was modified and strengthened through subsequent solution and aging. TiB2 particles were found to reduce metallurgical defects and enhance mechanical performance by forming Al3Ti compounds and refining grains. The as-built alloy exhibited excellent combination of strength and ductility, and the heat treatment further improved its yield strength and ultimate tensile strength, while slightly decreasing the elongation to failure. The strengthening mechanisms and plastic instability phenomenon of the alloy were analyzed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Shuai Guo, Zhiyi Liu, Song Bai, Linnan Ou, Jing Zhang, Guangyu He, Juangang Zhao
Summary: The effects of hot rolling temperature on microstructures, mechanical properties, and corrosion resistance of Al-Cu-Mg-Ag alloy were studied. Lowering the rolling temperature improved corrosion resistance without significantly impacting tensile strength, mainly due to the synergistic effect of solution and cluster strengthening. Ag atoms were found to segregate at grain boundaries in the alloy hot rolled at lower temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Ning Fang, Chunming Zou, Zunjie Wei, Hongwei Wang, Rong Zhang, Zheng Ran, Tao Chang
Summary: Increasing solidification pressure leads to reduced SDAS and transformation of eutectic Si morphology in Al alloys. The high pressure promotes the formation of nano-sized particles, enhances hardness and compressive strength, with alloys solidified at 4 GPa showing the highest mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Bingyi Zhang, Shasha Zhang, Haiquan Du, Zhengjun Yao, Xiang-shan Kong, Xuewei Tao
Summary: It has been found that under-aged (UA) treatment can enhance the creep resistance and prolong the creep fracture time in Al-Cu-Mg alloys. The creep deformation mechanism in this alloy is mainly attributed to fracture caused by dislocation slip and grain boundary migration. The longer creep fracture time of the UA alloy is attributed to the interaction between retained solutes (Cu and Mg) and grain boundaries and dislocations, as revealed by first-principles calculations.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Chongchen Xiang, Zhuo Huang, Zijian Wang, Hanlin Ding, Shun Xu
Summary: In this paper, Cu alloying was used to study Mg-Al-Ca-Mn-Cu magnesium alloys, aiming to develop magnesium alloys with higher heat conduction. The mechanical properties and thermal conductivity of the alloys were evaluated simultaneously due to the addition of Cu, meeting the requirements of developing high-strength and high-conductivity magnesium alloys. Compared with the commercial AZ31 magnesium alloy, the strength and plasticity of the alloys were improved through fine grain strengthening. Meanwhile, the amount of solid solution atoms in the alloy decreased and the content of the second phase particles increased, leading to a reduced degree of lattice distortion. On the other hand, the Cu element provided a large amount of free electrons for heat transfer, resulting in high thermal conductivity for the alloys.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Chunqi Yu, Yicheng Feng, Lei Wang, Jinlai Fu, Fuwei Kang, Sicong Zhao, Erjun Guo, Baoxia Ma
Summary: This study investigated the microstructure and properties of Al-Cu-Mg alloy under different deformation treatments. The results showed that the presence of brittle T phases caused stress concentration and decreased the plasticity of the alloy. On the other hand, the evenly distributed tiny GPB zones increased the ultimate tensile strength. Cold-rolled deformed alloy exhibited various texture components, while the fiber texture component disappeared in the pre-stretched deformed alloy. The alloy with a pre-stretching deformation of 1.4% achieved the highest ultimate tensile strength and yield strength, but had a decreased elongation compared to the cold-rolled deformed alloy.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Qi Zhao, Zhiyi Liu
Summary: To obtain a strong Goss texture in Al-Cu-Mg alloy sheet, texture evolution and related mechanisms during solution treatment were studied. It was found that the Goss texture can further develop during solution treatment, which is attributed to the growth of recrystallized Goss grains into deformed Brass grains and the slow growth of recrystallized Goss grains into substructured random grains. The effect of particles stimulated nucleation (PSN) on Goss texture formation and development was also revealed, showing that large Fe-rich phases restrict Goss grain nucleation and growth while relatively small θ and S phases do not hinder the development of Goss texture.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Ceramics
Bing Liu, Lei Li, Kai Xin Song, Min Min Mao, Zhilun Lu, Ge Wang, Linhao Li, Dawei Wang, Di Zhou, Antonio Feteira, Ian M. Reaney
Summary: In this study, a cold sintering process was used to pre-densify LiF ceramics, leading to significant grain growth and an increase in relative density to 92% after post-annealing treatments. The microwave quality factor (Qf) was greatly improved and reached a maximum of 110,800 GHz, making cold sintered LiF a promising component in low temperature co-fired ceramic formulations.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Review
Materials Science, Multidisciplinary
Dawei Wang, Linhao Li, Juan Jiang, Zhilun Lu, Ge Wang, Kaixin Song, Di Zhou, Ian M. Reaney
Summary: MW dielectric ceramics are essential for electronic components in wireless communication systems, but traditional high-temperature sintering methods limit their integration with other materials. Cold sintering, a process at lower temperatures, offers energy-efficient densification and better compatibility with diverse materials. Current research focuses on improving cold-sintered MW materials and devices, addressing challenges like unclear mechanisms and poor mechanical properties.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Materials Science, Ceramics
Yuping Ji, Kaixin Song, Shiyu Zhang, Zhilun Lu, Ge Wang, Linhao Li, Di Zhou, Dawei Wang, Ian M. Reaney
Summary: Composite ceramics of (1-x)wt%CaSnSiO5-xwt%K2MoO4 were fabricated by cold sintering process, where X-ray diffraction, Energy dispersive X-ray, and Raman spectroscopy confirmed the coexistence of CSSO and KMO without intermediate phases. With an increase in KMO weight fraction, the microwave performance of the ceramic composites improved.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Zhilun Lu, Weichao Bao, Ge Wang, Shi-Kuan Sun, Linhao Li, Jinglei Li, Huijing Yang, Hongfen Ji, Antonio Feteira, Dejun Li, Fangfang Xu, Annette K. Kleppe, Dawei Wang, Shi-Yu Liu, Ian M. Reaney
Summary: The study on lead-free Ag1-3xNdxTayNb1-yO3 antiferroelectric ceramics reveals the changes in structure and performance characteristics with doping of Nd and Ta. The doped elements contribute to stabilizing the antiferroelectric structure, increasing the switching field, optimizing polarization, and enhancing energy storage density.
Article
Physics, Multidisciplinary
Kejing Ran, Jinghui Wang, Song Bao, Zhengwei Cai, Yanyan Shangguan, Zhen Ma, Wei Wang, Zhao-Yang Dong, Aermak, A. Schneidewind, Siqin Meng, Zhilun Lu, Shun-Li Yu, Jian-Xin Li, Jinsheng Wen
Summary: This article presents the first polarized inelastic neutron scattering study on alpha-RuCl3 single crystals, revealing the existence of continuous magnetic excitations around the Gamma point, providing evidence for fractional excitations originating from the Kitaev quantum-spin-liquid phase, and supporting the validity of the K-Gamma model.
CHINESE PHYSICS LETTERS
(2022)
Article
Materials Science, Ceramics
Yuanyuan Wang, Hongbo Liu, Tingnan Yan, Jianwei Zhao, Shifeng Guo, Rong Sun, Zhilun Lu, Dawei Wang
Summary: In this study, Nb-doped 0.75SrTiO(3)-0.25BiFeO(3) (ST-BF) lead-free ceramics were designed and synthesized, and the effects of Nb doping on microstructure, dielectric, and electrical properties were investigated. It was found that Nb doping led to changes in crystal structure, grain size, and improved dielectric properties, with the 0.03 Nb-doped ST-BF composition exhibiting low dielectric loss and stable dielectric constant. Impedance spectroscopy analysis showed that Nb doping increased the total resistivity, forming an electrically conductive core and a nonconductive shell with enhanced activation energy.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Yuanyuan Wang, Hongbo Liu, Tingnan Yan, Jianwei Zhao, Junjie Li, Shifeng Guo, Shikuan Sun, Rong Sun, Zhilun Lu, Dawei Wang
Summary: Lead-free dielectric ceramics 0.75SrTiO3-0.25BiFeO3 with excess Bi were synthesized using the solid-state reaction method. The crystal structure remained pseudo-cubic as Bi content increased, leading to a heterogeneous core-shell microstructure. Impedance spectroscopy data showed that increasing excess Bi content improved the shell resistivity, reduced dielectric loss at 1 kHz, and increased breakdown strength.
Article
Materials Science, Ceramics
Yu Jiang, Huan Liu, Zhiyu Xiu, Guofa Wu, Minmin Mao, Xinjiang Luo, Bing Liu, Zhilun Lu, Zeming Qi, Dongyang Sun, Kaixin Song
Summary: Temperature stability is an important property for microwave electronic components and is crucial for evaluating the performance of microwave dielectric ceramics. This article investigates the regulation of the temperature coefficient of high-Q x f garnet-type Y2.95Dy0.05MgAl3SiO12 microwave ceramic through doping with different mass ratios of TiO2. The dielectric loss and theoretical permittivity of Y2.95Dy0.05MgAl3SiO12-9 wt%TiO2 ceramic were calculated using the Kramers-Kronig formula and found to align with experimental results. The fabrication and testing of a 5G millimeter-wave antenna using Y2.95Dy0.05MgAl3SiO12-9 wt%TiO2 ceramic demonstrated excellent temperature stability and radiation characteristics. These findings indicate that the temperature-stable ceramic antenna has promising prospects in 5G millimeter wave communication.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Chen Yang, Xinhua Chen, Minmin Mao, Xinjiang Luo, Weiqin Sheng, Zhilun Lu, Shikuan Sun, Hong He, Weitao Su, Kaixin Song
Summary: Orange-yellow luminescent Y2-xSr1-yAl4SiO12: xCe3+, yMn2+ (x = 0.04-0.06, y = 0.1-0.6, abbreviated as YSAS: xCe3+, yMn2+) phosphors with garnet structure were prepared by the high temperature solid-phase method. The doping of Ce3+/Mn2+ units can enhance the structural rigidity of the YAG host and promote the red-shift of the emission peak position of Mn2+. The thermal stability test of the phosphor showed that the luminous intensity at 473 K still maintained 86% of the room temperature.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Applied
Zhilun Lu, Dongyang Sun, Ge Wang, Jianwei Zhao, Bin Zhang, Dawei Wang, Islam Shyha
Summary: It is crucial to discover lead-free materials with ultrahigh recoverable energy density (W-rec). In this work, a high W-rec of 4.51 J/cm(3) was obtained in lead-free Nd-doped AgNb0.8Ta0.2O3 antiferroelectric ceramics. Nd doping paired with Nb-site vacancies stabilized the antiferroelectric phase and improved energy storage efficiency. Furthermore, Nd and Ta co-doping contributed to electrical homogeneity and large breakdown strengths.
JOURNAL OF ADVANCED DIELECTRICS
(2023)
Article
Physics, Multidisciplinary
Ge Wang, Tengfei Hu, Wenxuan Zhu, Zhilun Lu, Annette Kleppe, Maria Diaz Lopez, Antonio Feteira, Derek C. Sinclair, Zhengqian Fu, Houbing Huang, Dawei Wang, Ian M. Reaney
Summary: For the first time, the origin of large electrostrain in pseudocubic BiFeO3-based ceramics is verified with direct structural evidence backed by appropriate simulations. We employ advanced structural and microstructural characterizations of BiFeO3-based ceramics that exhibit large electrostrain (>0.4%) to reveal the existence of multiple, nanoscale local symmetries, dominantly tetragonal or orthorhombic, which have a common, averaged direction of polarization over larger, meso-or microscale regions. Phase-field simulations confirm the existence of local nanoscale symmetries, thereby providing a new vision for designing high-performance lead-free ceramics for high-strain actuators.
PHYSICAL REVIEW LETTERS
(2023)
Article
Crystallography
Zhuo Li, Dandan Zhang, Chenbo Wang, Jiayong Zhang, Zixuan Wang, Zhuo Wang, Xin Yan, Tao Ai, Dawei Wang, Zhilun Lu, Yanhui Niu
Summary: NBT-based ceramics are promising for energy-storage applications due to their outstanding dielectric and ferroelectric properties. However, they have high coercive field and large remnant polarization, which are unfavorable for practical use. By doping/forming solid solutions, NBT-based ceramics with relaxation behavior have been studied. In this study, BT was introduced to the NBT-BMN system to form a homogeneous solid solution. The optimal energy storage properties and temperature stability were obtained in BNT-7BT-BMN ceramics, making them promising for pulse power applications.
Editorial Material
Physics, Multidisciplinary
Zhilun Lu
Summary: A detailed understanding of phonon transport is crucial for controlling the thermal properties of materials. It has been shown that a specific doping strategy can lead to good thermoelectric performance with low thermal conductivity.
Article
Materials Science, Multidisciplinary
A. Samartzis, S. Chillal, H. O. Jeschke, D. J. Voneshen, Z. Lu, A. T. M. N. Islam, B. Lake
Summary: The magnetic excitation spectrum and Hamiltonian of the quantum magnet BaCuTe2O6 were investigated using inelastic neutron scattering (INS) and density functional theory (DFT). The INS results showed overlapping spinon continua, indicating an antiferromagnetic spin-1/2 spin chain, while the DFT calculations revealed dominant intrachain interaction (J3) and subleading antiferromagnetic hyperkagome interaction (J2). The study also highlighted the high sensitivity of the interactions to small changes in structure, which may explain the differences observed in sister compounds SrCuTe2O6 and PbCuTe2O6.
Article
Engineering, Multidisciplinary
Zhilun Lu, Yubo Zhu, Dongyang Sun, Bowen Wang, Dawei Wang, Sarah Day, Ge Wang
Summary: This study explores the use of tungsten and tantalum doping in AgNbO3 ceramics to achieve lead-free materials with high recoverable energy density. The co-doping approach effectively maintains electrical homogeneity and stabilizes the antiferroelectric phases at lower temperatures. In-situ high-resolution synchrotron powder x-ray diffraction reveals the phase transformation behavior of the doped ceramics at various temperatures.
RESULTS IN ENGINEERING
(2023)
