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Optimized Combinatorial Properties of an AlMgSi(Cu) Alloy Achieved by a Mechanical-Thermal Combinatorial Process

Acta Metallurgica Sinica(English Letters) 2020年第5期33卷 751-758页

作者： Li-Mei Liu Yu-Xiang Lai Chun-Hui Liu Jiang-Hua Chen Center for High-Resolution Electron Microscopy College of Materials Science&EngineeringHunan UniversityChangsha 410082China Hunan Province Key Laboratory for Spray Deposition Technology and Application Hunan UniversityChangsha 410082China

Enhancing combinatorial properties,such as excellent corrosion resistance,high strength and good ductility combined,is an important issue for manufacturing high-quality AlMgSi(Cu)***,we show that this can be achieved by optimizing a combinatorial process consisting of pre-ageing,cold-rolling and post-ageing to tailor the hierarchical microstructures of the *** electron microscopy analysis reveals that the enhanced combinatorial properties of corrosion resistance,strength and ductility are owing to modification of grain boundary microstructure in good association with changes of precipitate microstructures and a more homogenous distribution of solute atoms,as compared with the microstructures of the alloy processed by thermal ageing only.

关键词： Al alloy Corrosion resistance Mechanical property Ageing Deformation

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Evolution of the Stoichiometry of Cxshy and its Bonding Behavior During Co2 Sequestration of Γ-C2s

SSRN

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SSRN 2023年

作者： Xu, Qingyuan Huo, Zhen Sun, Jinfeng Lu, Bao Jiang, Ruiyu Zhang, Zhonglun Hou, Guihua Shi, Caijun Key Laboratory for Advanced Technology in Environment Protection of Jiangsu Province Yancheng Institute of Technology Jiangsu Yancheng224051 China China National Building Material Group Technology Innovation Academy Zaozhuang277100 China Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University Changsha410082 China

This paper reports the stoichiometric evolution of the carbonation product xCaO-SiO2-yH2O (CxSHy) produced by carbonation of γ-dicalcium silicate (γ-C2S) and the bonding behavior between CxSHy with calcium carbonate (CC) - another carbonation product of γ-C2S. The x and y in CxSHy were determined with three methods, that is, backscattered electron-energy dispersive spectroscopy (BSE-EDS), thermogravimetric (TG) tests combined with quantitative X-ray diffraction (QXRD), and transmission electron microscopy-energy dispersive spectroscopy (TEM-EDS), respectively. The results showed that the ranges of x and y in CxSHy were 0.13-0.24and 0.09-0.17, respectively after carbonation for 48 h. After 96 h, the x is nearly 0. The collapse of the local CC shell layer was observed by SEM, and analyses of fractures formed in tensile testing showed cracks at the junctions of CxSHy with CC. This result indicates that the interface of their two phases is the weak part of the block material. © 2023, The Authors. All rights reserved.

关键词： Carbon dioxide

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Journey into Automation: Image-Derived Pavement Texture Extraction and Evaluation

arXiv

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arXiv 2025年

作者： Lu, Bingjie Dan, Han-Cheng Zhang, Yichen Huang, Zhetao School of Civil Engineering Central South University Changsha Hunan410075 China National Engineering Research Center for High-speed Railway Construction Technology Central South University Hunan Changsha410075 China Rail Data Research Application Key Laboratory of Hunan Province Central South University Hunan Changsha410075 China

Mean texture depth (MTD) is pivotal in assessing the skid resistance of asphalt pavements and ensuring road safety. This study focuses on developing an automated system for extracting texture features and evaluating MTD based on pavement images. The contributions of this work are threefold: firstly, it proposes an economical method to acquire three-dimensional (3D) pavement texture data;secondly, it enhances 3D image processing techniques and formulates features that represent various aspects of texture;thirdly, it establishes multivariate prediction models that link these features with MTD values. Validation results demonstrate that the Gradient Boosting Tree (GBT) model achieves remarkable prediction stability and accuracy (R2 = 0.9858), and field tests indicate the superiority of the proposed method over other techniques, with relative errors below 10%. This method offers a comprehensive end-to-end solution for pavement quality evaluation, from images input to MTD predictions output. Copyright © 2025, The Authors. All rights reserved.

关键词： Image texture

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Editing the Shape Morphing of Monocomponent Natural Polysaccharide Hydrogel Films

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Research 2021年第1期2021卷 835-846页

作者： Hao Hu Chao Huang Massimiliano Galluzzi Qiang Ye Rui Xiao Xuefeng Yu Xuemin Du Institute of Biomedical&Health Engineering Shenzhen Institute of Advanced Technology(SIAT)Chinese Academy of Sciences(CAS)Shenzhen 518035China Key Laboratory of Polymeric Materials and Application Technology of Hunan Province Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of EducationSchool of ChemistryXiangtan UniversityXiangtan 411105China Institute of Advanced Materials Science and Engineering Shenzhen Institute of Advanced Technology(SIAT)Chinese Academy of Sciences(CAS)Shenzhen 518035China State Key Laboratory of Fluid Power&Mechatronic System Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceDepartment of Engineering MechanicsZhejiang UniversityHangzhou 310027China

Shape-morphing hydrogels can be widely used to develop artificial muscles,reconfigurable biodevices,and soft ***,conventional approaches for developing shape-morphing hydrogels highly rely on composite materials or complex manufacturing techniques,which limit their practical ***,we develop an unprecedented strategy to edit the shape morphing of monocomponent natural polysaccharide hydrogel films via integrating gradient cross-linking density and geometry *** to the synergistic effect,the shape morphing of chitosan(CS)hydrogel films with gradient cross-linking density can be facilely edited by changing their geometries(length-to-width ratios or thicknesses).Therefore,helix,short-side rolling,and longside rolling can be easily ***,various complex artificial 3D deformations such as artificial claw,horn,and flower can also be obtained by combining various flat CS hydrogel films with different geometries into one system,which can further demonstrate various shape transformations as triggered by *** work offers a simple strategy to construct a monocomponent hydrogel with geometry-directing programmable deformations,which provides universal insights into the design of shape-morphing polymers and will promote their applications in biodevices and soft robotics.

关键词： effect linking geometry

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Correction to: A flame-retardant densified wood as robust and fire-safe structural material

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Wood Science and technology 2023年第1期57卷 325-328页

作者： Fan, Chuangang Gao, Yuxin Li, Yuhao Yan, Long Zhu, Deju Guo, Shuaicheng Ou, Changhong Wang, Zhengyang Department of Civil Engineering Central South University Changsha China Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University Changsha China Dongfanghong Construction Group Changsha China

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Experimental Study on L-shaped Concrete-filled Steel Tubular Columns under Axial Compression and Eccentric Compression

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Journal of Engineering Science and technology Review 2024年第2期17卷 175-181页

作者： Hu, Zhangqi He, Ran Liu, Jin Wang, Meng Zhang, Junyuan School of Civil Engineering Hunan City University Yiyang413000 China Hunan Engineering Research Center of Development and Application of Ceramsite Concrete Technology Hunan City University Yiyang413000 China Key Laboratory of Green Building and Intelligent Construction in Higher Educational Institutions of Hunan Province Yiyang413000 China Hunan Zhongda Designing Institute Co. Ltd. Changsha411201 China

Special-shaped concrete-filled steel tubular columns are widely utilized in high-rise buildings. In order to further simplify the construction steps and increase the application scope, a novel L-shaped concrete-filled steel tubular column (LCFSTC) was proposed. Nine specimens, scaled at 1:1, were designed and grouped with specimen lengths of 0.5, 1.0, and 2.0 m. Compressive tests were performed on the nine specimens under various experimental parameters, including specimen length, concrete strength, and loading conditions (axial or eccentric loading). The tests aimed to verify the reliability of the LCFSTC and explore its mechanical properties by analysing failure modes, load-vertical deflection curves, load-rotation angle curves, and load-strain curves. Results demonstrate that no specimen experienced weld seam failure, indicating good structural integrity for the LCFSTCs. For the axial-loading specimens, the bearing capacity and ductility increase with the specimen length. As the specimen length increases from 0.5 m to 1.0 and 2.0 m, the ductility coefficient (mean value) decreases by 23.0% and 47.2%, respectively. Increasing the concrete strength can improve the bearing capacity;the average bearing capacity of the specimens with a concrete strength of C40 increases by 17.1% compared with that of the C30 specimens. Eccentric loading increases the lateral deformation and affects the strain distribution and bearing capacity. This study can provide a good reference for the application and design of special-shaped concrete-filled steel tubular columns. © (2024) School of Science, DUTH. All rights reserved.

关键词： Bearing capacity

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Effect of varying shear rates at different resting times on the rheology of 3D printable concrete

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Materials Today: Proceedings 2023年

作者： Giridhar, Greeshma Prem, Prabhat Ranjan Jiao, Dengwu CSIR Structural Engineering Research Centre Taramani Chennai 600 113 Tamil Nadu India Key Laboratory for Green and Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University Changsha 410082 China

3D printing offers a paradigm shift in the construction industry. The material undergoes different stages like mixing, pumping, extruding, and printing with disparate shearing patterns and the effect of shear rates must be brought into consideration. The rheological properties of 3D printable concrete with varying shear rates at different resting times were studied. The designed mix has an ultra-high compressive strength of 110 MPa. Different hystresis curves with shear rates of 0-25 s-1 (P1) and 0-50 s-1 (P2) are studied. The tests were conducted at 10 min intervals up to 30 min resting time. The experimental down flow curves are further analyzed using the Bingham model, the modified Bingham model, and the Herschel-Bulkley model. It is observed that the rheological properties of 3D printable concrete are highly dependent on the resting time, and the applied shear rates and demand judicious selection of rheological models to predict yield stress and plastic viscosity. The comparison between experimental and analytical models indicates better predictability with the modified Bingham and Herschel- Bulkley model. The yield stress values for the modified Bingham model were found to be varying from 95 Pa to 178 Pa and Herschel-Bulkley model from 130 Pa to 177 Pa for P1 and P2, respectively. © 2024 Elsevier Ltd. All rights reserved.

关键词： 3D printing

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Mass Transfer during Hematitization and Implications for Uranium Mineralization in the Zoujiashan Deposit,Xiangshan Volcanic Basin

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Journal of Earth Science 2022年第2期33卷 422-434页

作者： Teng Deng Guoxiang Chi Xiongjie Zhang Zenghua Li Deru Xu Shengmiao Li Pengfei Du Pei Shang Shaohao Zou Wanpeng Zhou Ke Xu Hai Yan MaWen Zhengpeng Ding State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China Key Laboratory of Uranium Geology China Geological SurveyTianjin 300170China School of Earth Sciences East China University of TechnologyNanchang 330013China Department of Geology University of ReginaRegina S4S 0A2Canada Engineering Research Center of Nuclear Technology Application Ministry of EducationEast China University of TechnologyNanchang 330013China Jiangxi Engineering Laboratory on Radioactive Geoscience and Big Data Technology East China University of TechnologyNanchang330013China Geological Bureau of Hunan Province Changsha 410014China Geologic Party No.208 China National Nuclear CorporationBaotou 410014China

The Zoujiashan uranium deposit in the Xiangshan ore field is the largest volcanic-related uranium deposit in ***-and fluorite-type ores are the predominant mineralization *** in the Xiangshan ore field is closely associated with uranium mineralization,mainly occurring as hematitized rocks enclosing fluorite-type vein ores developed in pre-ore illitized porphyritic *** petrographic and mass balance calculation studies were conducted to evaluate the mechanisms for uranium precipitation and mass transfer during *** observations suggest that in the hematitized rocks,orthoclase is more altered than plagioclase,and quartz dissolution is common,whereas in the illitized rocks,pyrite commonly occurs within the altered biotite grains,and chlorite grains are locally *** balance calculations indicate that Na2O and U were gained,K2O,Ca O and Si O2were lost,whereas Fe2O3-t remained more or less constant during *** observations suggest that the hydrothermal fluids were Na-and U-rich and Ca-K-poor,and the Fe2+used for hematitization was locally derived,most likely from biotite,pyrite and chlorite in the host *** Fe2+is inferred to have played the role of reductant to precipitate uranium,and calculation indicates that oxidation of Fe2+provided by host rocks is sufficient to form ores of economic ***,the hematite-type ore is interpreted to be generated by the reaction between oxidized ore fluids and reduced components in host *** development of calcite and pyrite in the fluorite ores suggests that perhaps mixing between the U-rich fluid and another fluid carrying reduced sulfur and carbon may have also contributed to uranium mineralization,in addition to temperature and pressure drop associated with the veining.

关键词： Xiangshan uranium ore field mass transfer uranium precipitation hematitization redox reaction ore deposit geology

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Determination of birefringence of myocardial tissue based on PS-OCT with circularly polarized light as reference 16

Determination of birefringence of myocardial tissue based on...

引用

16th International Conference on Photonics and Imaging in Biology and Medicine, PIBM 2023

作者： Li, Wangbiao Li, Ke Li, Dezi Chen, Haiyu Cao, Wenliang Zhuo, Shufeng Li, Hui Li, Zhifang Key Laboratory of Optoelectronic Science and Technology for Medicine Ministry of Education Fujian Provincial Key Laboratory of Photonics Technology Fujian Provincial Engineering Technology Research Center of Photoelectric Sensing Application College of Photonic and Electronic Engineering Fujian Normal University Fuzhou Fujian350117 China Key Lab. of Intelligent Contr. Technol. for Wuling-Mountain Ecological Agriculture in Hunan Province Huaihua University Huaihua Hunan418000 China Fujian Medical University Department of Cardiovascular Surgery Fujian Provincial Hospital Fuzhou Fujian350001 China The Internet of Thing and Artificial Intelligence College Fujian Polytechnic of Information Technology Fuzhou Fujian350001 China

ISBN: (纸本)9781510667341

In this study, the modified spectral domain polarization-sensitive optical coherence tomography (SD PS-OCT) is proposed for determining the birefringence of the myocardial tissue. In this modified SD PS-OCT, the circular polarization state of light was generated before entering the beam splitter. Thus, the polarization states in the reference and sample arms are both circular, and the symmetry between them is good without using additional quarter-wave plate (QWP), which reduce the dispersion effect. The results demonstrated that theoretical analysis for determination of birefringence including the phase retardance and the fast axis orientation based on Stokes parameters of backscattered from biological tissue, which is different from the traditional SD PS-OCT. In addition, the phase retardance and the fast axis orientation was used to differentiate the myocaridal tissue in the diastole of the cardiac cycle the from that in the systole of the cardiac cycle. The findings suggest that the SD PS-OCT be a potential tool for the real-Time monitoring the change of the myocardial wall during the cardiac cycle. © 2023 SPIE.

关键词： Birefringence

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Strengthening in Al-,Mo-or Ti-doped CoCrFeNi high entropy alloys:A parallel comparison

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Journal of Materials Science & technology 2021年第35期94卷 264-274页

作者： Xi Li Zhongtao Li Zhenggang Wu Shijun Zhao Weidong Zhang Hongbin Bei Yanfei Gao College of Materials Science and Engineering&Hunan Province Key Laboratory for Spray Deposition Technology and Application Hunan UniversityChangsha 410082China Department of Mechanical Engineering City University of Hong KongHong KongChina epartment of Materials Science and Engineering Center of Electron Microscopy and State Key Laboratory of Silicon MaterialsZhejiang UniversityHangzhou 310027China Department of Materials Science and Engineering University of TennesseeKnoxvilleTN 37996United States

In the current work,a parallel comparison of the influence of Al,Mo and Ti,on the microstructure and strengthening of the CoCrFeNi alloy was *** achieve this,inconsistencies on variables including the extent of alloying,thermomechanical processing and property-evaluation method were ***,following cold-rolling,annealing of the 4 at.%Al-doped alloys at 800-1000℃ did not result in phase separation;nevertheless,that of the 4 at.%Mo-and Ti-doped alloys led to the respective formation ofσandηphase and,consequently,caused extra strengthening through the Orowan dislocation bypassing *** systematic qualitative analysis and DFT calculations showed that Al and Ti are more effective than Mo in reducing the stacking fault energy(SFE)of the CoCrFeNi alloy,because they can induce more considerable deformation of electronic density,making the gliding of atomic layers *** identical thermomechnical processing,Al-,Mo-,and Ti-doping causes different extent of solid solution strengthening and grain boundary *** causes the most pronounced solid solution strengthening but does not benefit the grain boundary strengthening;in contrast,the effectiveness of grain boundary strengthening is boosted by the doping Al and *** analyses support that Labusch instead of Fleischer mechanism is applicable to explain the differences in solid solution strengthening,and the observed differences in grain boundary strengthening arise from the different tendency of Al,Mo and Ti to reduce the SFE of *** addition,we determined the value of the dimensionless parameter f in the Labusch model for CoCrFeNi-based alloys and observed a close relation between Hall-Petch slope and *** more in-depth studies are needed to provide full and mechanistic understandings,both these findings in fact presents significant values toward designing novel singlephase high-strength CoCrFeNi-based alloys through manipulating the solid solution an

关键词： CoCrFeNi alloy Compositional effect Solid solution strengthening Grain boundary strengthening Precipitation strengthening Stacking fault energy

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