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Nanophase Transformation and Strengthening - Toughening Mechanism of the Cu-15ni-8sn Alloy During Aging

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SSRN 2023年

作者： Jiang, Kai-Xuan Zhou, Yanjun Yang, Ran Song, Kexing Liu, Yahui Zhang, Yanmin Yang, Shaodan Zhou, Fei Huang, Kuan Liu, Dongdong Yang, Wenhao School of Materials Science and Engineering Henan University of Science and Technology Luoyang471023 China Provincial and Ministerial Co-construction Collaborative Innovation Center of Nonferrous New Materials and Advanced Processing Technology Luoyang471023 China Henan Key Laboratory of Advanced Nonferrous Metals Luoyang471023 China School of Medical Technology and Engineering Henan University of Science and Technology Luoyang471023 China Henan Academy of Sciences Zhengzhou450046 China School of Mechatronics Engineering Henan University of Science and Technology Henan Luoyang471023 China School of Material Science & Engineering Zhengzhou University Zhengzhou450001 China

The Cu-15Ni-8Sn alloy ingot was prepared in the medium-frequency induction melting furnace. The hot extruded alloy was treated by solid solution at 840 °C for 60 min and aging at 400 °C for different times (0 min~480 min). The effect of aging time on the evolution of the nanophase of Cu-15Ni-8Sn alloy and the strengthening-toughening mechanism were studied. The results show that at the beginning of aging, the alloy undergoes spinodal decomposition, the wavelength of the modulated structure is approximately 3~7 nm, the ordered phase transformation of D022 and L12 occurs simultaneously, and the ordered phase size is approximately 5 nm. With the extension of aging time, the modulated structure became coarser, and the wavelength of the modulated structure increased to 5~9 nm. At the same time, the D022 ordered phase changed to the L12 ordered phase, and a continuous distribution of elliptical discontinuous precipitation appeared at the grain boundary. The ratio of the long and short axes of the discontinuous precipitation was approximately 4.7. In the late aging period, the D022 ordered phase was basically transformed into the L12 ordered phase, and discontinuous precipitation, which is incompatible with the matrix, extended into the crystal. After 120 min of aging at 400°C, the hardness, strength, and elongation of the alloy are 105.4 HRB, 839.8 MPa and 9.6%, respectively. The peak-aging states D022 and L12 coexist in an orderly phase at the nanoscale, and this nanoscale strengthening phase is completely integrated with the matrix, which improves the strength and toughness of the alloy. The research results can provide support for the development of high-performance copper alloys in the ocean. © 2023, The Authors. All rights reserved.

关键词： Tin alloys

Machine learning aided parameter analysis in Perovskite X-ray Detector

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arXiv

arXiv 2024年

作者： Zhang, Bobo Huang, Endai Du, Xinyi Ma, Xiaokang Zhang, Lu You, Jiaxue Jen, Alex K.Y. Liu, Shengzhong Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi’an710119 China Research Institute of Medical and Biological Engineering Ningbo University Zhejiang315211 China Department of Computer Science and Engineering The Chinese University of Hong Kong 999077 Hong Kong Department of Chemical and Biomolecular Engineering National University of Singapore Singapore Singapore National University of Singapore Singapore Singapore State Key Laboratory of Solidification Processing Northwestern Polytechnical University Shaanxi Xi’an710072 China Department of Materials Science and Engineering Hong Kong Institute for Clean Energy City University of Hong Kong 999077 Hong Kong Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian116023 China University of the Chinese Academy of Sciences Beijing100039 China

Many factors in perovskite X-ray detectors, such as crystal lattice and carrier dynamics, determine the final device performance (e.g., sensitivity and detection limit). However, the relationship between these factors remains unknown due to the complexity of the material. In this study, we employ machine learning to reveal the relationship between 15 intrinsic properties of halide perovskite materials and their device performance. We construct a database of X-ray detectors for the training of machine learning. The results show that the band gap is mainly influenced by the atomic number of the B-site metal, and the lattice length parameter b has the greatest impact on the carrier mobility-lifetime product (μτ). An X-ray detector (m-F-PEA)2PbI4 were generated in the experiment and it further verified the accuracy of our ML models. We suggest further study on random forest regression for X-ray detector applications. © 2024, CC BY.

关键词： Machine learning

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增材制造超材料的发展趋势与挑战（英文）

Engineering 2025年第1期 2-6页

作者：宋波 Shaoji Zhang 张磊史玉升 State Key Laboratory of Materials Processing and Die&Mold Technology School of Materials Science and Engineering Huazhong University of Science and Technology Department of Mechanical Engineering City University of Hong Kong

1. Introduction To design novel architectures with unique properties that surpass those of natural matter, scientists have developed diverse structures/materials by incorporating artificial structures of periodic/aper...

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Development and application of phase diagrams for Li-ion batteries using CALPHAD approach

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Progress in Natural Science:materials International 2019年第3期29卷 265-276页

作者： Na Li Dajian Li Weibin Zhang Keke Chang Feng Dang Yong Du Hans J.Seifert Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University Institute for Applied Materials–Applied Materials Physics (IAM-AWP) Karlsruhe Institute of Technology (KIT) Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences State Key Laboratory of Powder Metallurgy Central South University

Phase diagrams provide fundamental knowledge about design map of new electrode materials for Li-ion batteries. The CALPHAD (CALculation of PHAse Diagrams) approach is widely applied to the development of phase diagrams and property diagrams in a thermodynamic language. Within the CALPHAD framework, the theoretical modeling can be performed to predict phase equilibria, thermodynamics, electrochemical and physical properties of electrodes. This review provides the successful application of high quality calculated phase diagrams and thermodynamic property diagrams in CALPHAD investigation to both cathodes and anodes of Li-ion batteries, including Li–Co–O, Li–Ni–O, Li–Co–Ni–O, Li–Mn–O, Li–Cu–O, Li–Si, Li–Sb and Li–Sn systems with. The intensive CALPHAD-type research may also predict electrochemical properties, cell performance of the Li-ion batteries to achieve more efficient development of electrode materials.

关键词： Li-Ion battery Phase diagram CALPHAD Thermodynamic property Electrochemical behavior

Donor-Acceptor Molecule with Tict Character: A New Design Strategy for Organic Photothermal Material in Solar Energy

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SSRN 2023年

作者： Wang, Chenguang Dai, Jianan Zhao, Meng Qi, Shuo Liu, Jing Jia, Tao Liu, Fangmeng Sun, Peng Li, Bo Zhou, Ji Lu, Geyu State Key Laboratory of Integrated Optoelectronics Key Laboratory of Advanced Gas Sensors of Jilin Province College of Electronic Science & Engineering Jilin University Changchun130012 China Key Laboratory of Forest Plant Ecology Ministry of Education Engineering Research Center of Forest Bio-Preparation College of Chemistry Chemical Engineering and Resource Utilization Northeast Forestry University Harbin150040 China Hebei Key Laboratory of Hazardous Chemicals Safety and Control Technology School of Chemical Safety North China Institute of Science and Technology Langfang065201 China State Kay Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China International Center of Future Science Jilin University Changchun130012 China

Organic photothermal materials, particular the donor-acceptor (D-A) type ones, have attracted increased attention because they could efficiently transform solar energy to heat in an environmentally friendly manner. So far, there are many strategies to improve the fluorescence of D-A type molecules, while how to quench the fluorescence via non-radiative decay process and thus maximize the solar-thermal conversion efficiency is rarely investigated. Herein, a new design strategy is proposed to overcome this bottleneck, that is, formatting a unique twisted intramolecular charge-transfer (TICT) excitation state for the D-A type molecule. To demonstrate this new design strategy, three D-A molecules TPA-BTO, TPA-BTO-Py+ and GTPA-BTO-Py+ are synthesized with the consideration of employing stronger donor/acceptor moieties. The photophysical measurements and theoretical calculations reveal that these molecules display strong tendency to form TICT state, and the stronger donor/acceptor would significantly promote the TICT-based non-radiative decay process. Consequently, the target molecule GTPA-BTO-Py+ is totally non-fluorescent and could efficiently transform the absorbed solar energy to heat. Further combined with the wide absorption up to 1300 nm, GTPA-BTO-Py+ solid displays a high solar-thermal conversion efficiency of 20.5%. Finally, the utility of GTPA-BTO-Py+ as highly efficient photothermal material in solar energy is highlighted by water evaporation and thermoelectric generation. © 2023, The Authors. All rights reserved.

关键词： Molecules

Laser Powder Bed Fusion Process of NiTi Alloys for Orthopedic Implants and Their Superelastic Properties

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Zhongguo Jiguang/Chinese Journal of Lasers 2025年第12期52卷

作者： Zheng, Xu Song, Jun Song, Bo Zhang, Lei Zhong, Shiyu Liu, Yan Zhang, Yuanjie Shi, Yusheng State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Hubei Wuhan 430074 China Department of Mechanical Engineering City University of Hong Kong 999077 Hong Kong

Objective Bone tissue engineering is a crucial approach for treating bone defects. NiTi alloys are regarded as highly promising materials for bone tissue engineering due to their exceptional superelasticity, shape memory effect, high specific strength, excellent corrosion resistance, and biocompatibility. However, their further development is constrained by traditional fabrication methods. Laser powder bed fusion (LPBF) technology can precisely control the porosity, phase transition temperature, and comprehensive properties of NiTi alloys, providing a new approach for preparing NiTi alloy bone scaffolds. Based on the application requirements of bone implants, this study systematically investigates the phase transformation temperature, mechanical properties, and superelastic behavior of LPBF-fabricated NiTi alloys, aiming to provide a theoretical foundation for the development of LPBF-fabricated NiTi alloy bone implants. Methods In this study, near-equiatomic NiTi alloy powder (Ni atomic fraction of 50.8%) is fabricated using an LPBF system. During the printing process, a process window is established by varying the laser power (P of 190‒310 W) and scan speed (v of 900‒1300 mm/s) to produce NiTi alloy samples with dimensions of 8 mm×8 mm×8 mm. The density of the samples is measured using the Archimedes drainage method, and the phase transformation temperatures are determined using differential scanning calorimetry (DSC), with the results visualized in a contour map. Additionally, the phase composition and microstructural evolution are analyzed using X-ray diffraction (XRD) and electron backscatter diffraction (EBSD). The mechanical properties and superelastic behavior are evaluated through uniaxial tensile tests and cyclic loading–unloading experiments. Results and Discussions An analysis of the contour maps of phase transformation temperature and relative density shows that under a constant laser power of 250 W, the phase transformation temperature of the samples is

关键词： laser powder bed fusion laser technique microstructure NiTi alloy phase-transition temperature superelasticity

Surface engineering of ceramic membranes: Unveiling the role of urea-based modifiers in enzyme immobilization

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Separation and Purification technology 2025年 376卷

作者： Katarzyna Knozowska Marta Głodek Izabela Koter Joanna Kujawa Guoqiang Li Xiao Chen Piotr Szczepański Wojciech Kujawski Faculty of Chemistry Nicolaus Copernicus University in Toruń 7 Gagarina Street Toruń 87-100 Poland Institute of Chemical Technology and Engineering Faculty of Chemical Technology Poznan University of Technology Berdychowo 4 Poznan 60965 Poland State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China

This work presents the functionalization of ceramic membranes with novel modifiers to enhance the immobilization efficiency and catalytic performance of Candida antarctica lipase B (CALB). Three newly synthesized urea-based silane modifiers − Si-C 3 H 6 -U-CH 2 CH 3 , Si-C 3 H 6 -U-CH 2 NH 2 , and Si-C 3 H 6 -U-NHCH 3 , were grafted onto Al 2 O 3 powders and ZrO 2 planar ceramic membranes and compared with a commercial alkylsilane (Si-C 8 H 17 ). Comprehensive physicochemical characterization confirmed successful grafting with high efficiency (up to 98 %), tunable surface hydrophobicity, and nanometric control over grafted layer thickness (1.11–1.44 nm). Enzyme immobilization was performed via physical adsorption, and performance was evaluated using a model enantioselective transesterification of (R,S)-1-phenylethanol. Among the tested surfaces, Si-C 3 H 6 -U-CH 2 CH 3 demonstrated the highest lipase loading (0.41 mg) and superior catalytic activity (initial conversion rate: 104 μmol h −1 ), significantly outperforming the commercial modifier (Si-C 8 H 17 ). Enhanced activity correlated with increased surface hydrophobicity, facilitating the lipase’s open conformation and active site accessibility. The membranes also displayed distinct zeta potential profiles and adhesion characteristics, indicating that terminal functional groups play a crucial role in enzyme affinity and surface interaction. Reusability studies revealed that the Si-C 3 H 6 -U-CH 2 CH 3 -functionalized membranes retained 81 % of their initial activity after two cycles, though activity declined to 31 % after five cycles − likely owing to enzyme desorption from the membrane surface. These findings highlight the interplay between surface chemistry, enzyme interaction, and catalytic performance, offering a pathway for tailoring membrane supports for biocatalytic applications. This work provides a valuable insight into designing next-generation enzyme-functionalized membranes for sustainable chemical pr

关键词： Aluminium oxide Candida Antarctica B lipase Enzyme immobilization Spacers Surface modification ZrO2 ceramic membrane

Co and Si Effects on the Cu-Co-Si Alloy Microstructure and Physical Properties

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SSRN 2022年

作者： Zhang, Yi Yang, Pengfei Zhou, Meng Volinsky, Alex A. Jia, Yanlin Tian, Baohong Liu, Yong Li, Xu Rao, Maipai Dai, Xueqin School of Materials Science and Engineering Henan University of Science and Technology Luoyang471023 China Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology Luoyang471023 China Henan Key Laboratory of Nonferrous Materials Science and Processing Technology Luoyang471023 China School of Materials Science and Engineering Central South University Changsha410083 China Center for Advanced Measurement Science National Institute of Metrology Beijing100029 China Department of Mechanical Engineering University of South Florida 4202 E. Fowler Ave. ENG030 Tampa33620 United States

The microstructure transformations and physical properties of Cu-Co-Si alloys with different Co/Si mass ratios and additional amounts of Co and Si were studied under different aging conditions. When the Co/Si mass ratio is close to 4.2, the alloy has good electrical conductivity. Excess amounts of Co or Si degrade the alloys’ electrical conductivity, and Si degrades conductivity more than Co. Compared with Si, excess amounts of Co excess can greatly improve the strength of the alloy. Based on the 4.2 Co/Si mass ratio, proportional additions of Co and Si improve the Cu-Co-Si alloy strength and other physical properties. Increasing the Co/Si mass ratio or adding larger Co and Si amounts can accelerate the precipitation rate of solute atoms and shorten the aging time. Cu-Co-Si alloy is the basis of the Cu-(Ni-Co)-Si alloy. The advantages and disadvantages of the Cu-Co-Si alloys are pointed out in this paper, which provides a theoretical reference for the high-quality Cu-(Ni-Co)-Si alloy development. © 2022, The Authors. All rights reserved.

关键词： Silicon alloys

Polypyrrole-Derived Carbon Nanotubes for Potential Application in Electrochemical Detection of Dopamine

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SSRN 2022年

作者： Wang, Yangyuchuang Yao, Wenzi Huang, Huabo Huang, Juan Li, Liang Yu, Xianghua Key Laboratory for Green Chemical Process of Ministry of Education Engineering Research Center of Phosphorus Resources Development and Utilization Ministry of Education Hubei Key Laboratory of Plasma Chemistry and Advanced Materials School of Materials Science and Engineering Wuhan Institute of Technology Wuhan430205 China Key Laboratory of Green Processing and Functional New Textile Materials Ministry of Education School of Textile Science and Engineering Wuhan Textile University No.1 Sunshine Avenue Wuhan430200 China Key Laboratory of Optoelectronic Chemical Materials and Devices Ministry of Education Jianghan University Wuhan430056 China

A novel electrochemical sensor for dopamine (DA) is developed based on heteroatom-doped carbon nanotubes derived from polypyrrole. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, specific surface analyzer, and cyclic voltammetry are employed to characterize the microstructure and property of the products. The electrochemical catalytic activities of heteroatom-doped carbon nanotubes modified glassy carbon electrode (GCE) towards DA are further investigated by cyclic voltammetry, amperometry, and differential pulse voltammetry. The results indicate that heteroatom-doped carbon nanotubes prepared by pyrolysis of polypyrrole nanotubes at 800 oC possessed higher specific surface area and better electrochemical activity compared with others obtained at different temperatures. Therefore, the electrochemical sensor fabricated by the heteroatom-doped carbon nanotubes shows excellent detection ability towards DA as well as remarkable anti-interference ability and stability. These features collectively endow the polypyrrole-derived carbon nanotubes with a promising application for the fabrication of electrochemical sensors. © 2022, The Authors. All rights reserved.

关键词： Carbon nanotubes