检索结果-内蒙古大学图书馆

Effects of AlCoCrFeNiTi high-entropy alloy on microstructure and mechanical properties of pure aluminum

Journal of materials Science & technology 2020年第17期52卷 1-11页

作者： Qinglin Li Shang Zhao Xuepeng Bao Yushi Zhang Yuqian Zhu Chuangzao Wang Yefeng Lan Yuxin Zhang Tiandong Xia School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China

A new kind of AlCoCrFeNiTi high-entropy alloy(HEA)as a grain refiner was prepared by vacuum arc *** this work,the effects of HEA(1.0 wt.%,2.0 wt.%and 3.0 wt.%)on the microstructure and mechanical properties of pure aluminum were *** microstructure was characterized and examined by scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDS),X-ray diffraction(XRD),electron probe micro-analyzer(EPMA)and transmission electron microscopy(TEM)to indicate the refining abilities and mechanism of HEA on pure *** show that the addition of HEA refined both the macrostructure and microstructure of pure *** 1.0 wt.%HEA was added,most coarse columnar grains were refined into equiaxed crystals,and as the amount of HEA increased to 2.0 wt.%and3.0 wt.%,aluminum grains were further refined,and the grain boundaries were nearly ***,the morphology ofα-Al transformed from coarse columnar crystals to equiaxed grains,and the mean size ofα-Al grains decreased from 374μm to 27μ*** Al3Ti,Al3Ni,and nano-phase precipitated from the aluminum alloy with HEA in the *** typical rod-like nano-phases distributed interdendritic regions ofα-*** average length of nano-phases is 2568 nm,4372 nm,and 6907 nm and the average diameter is 112 nm,103 nm,and 92 nm when 1.0 wt.%,2.0 wt.%and 3.0 wt.%HEA were added to the pure aluminum,*** ultimate tensile strength(UTS)and yield strength(YS)were improved in all samples,whereas the elongation(El)was decreased with increasing HEA *** 3.0 wt.%HEA was added into the aluminum melt,the UTS was improved by 145.2%from62 MPa to 152 MPa,the YS was increased by 173.8%from 42 MPa to 115 MPa,and the El was decreased by 33.3%from 39%to 26%.

关键词： Pure aluminum High-entropy alloy α-Al phases Nano-phases Mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Peridynamic stress is the static first Piola-Kirchhoff Virial stress

arXiv

引用

arXiv 2022年

作者： Li, Jun Li, Shaofan Lai, Xin Liu, Lisheng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Civil and Environmental Engineering University of California BerkeleyCA94720 United States Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of Technology Wuhan430070 China

The peridynamic stress formula proposed by Lehoucq and Silling [1, 2] is cumbersome to be implemented in numerical computations. Here, we show that the peridynamic stress tensor has the exact mathematical expression as that of the first Piola-Kirchhoff static Virial stress originated from Irving-Kirkwood-Noll formalism [3, 4] through the Hardy-Murdoch procedure [5, 6], which offers a simple and clear expression for numerical calculations of peridynamic stress. Several numerical verifications have been carried out to validate the accuracy of proposed peridynamic stress formula in predicting the stress states in the vicinity of the crack tip and other sources of stress concentration. The peridynamic stress is evaluated within the bond-based peridynamics with prototype microelastic brittle (PMB) material model. It is found that the PMB material model may exhibit nonlinear constitutive behaviors at large deformations. The stress fields calculated through the proposed peridynamic stress formula show good agreements with finite element analysis results, analytical solutions, and experimental data, demonstrating the promising potential of derived peridynamic stress formula in simulating the stress states of problems with discontinuities, especially in the bond-based peridynamics. Copyright © 2022, The Authors. All rights reserved.

关键词： Continuum mechanics

来源：评论

学校读者我要写书评

暂无评论

Zn-doping enhances the photoluminescence and stability of PbS quantum dots for in vivo high-resolution imaging in the NIR-II window

引用

Nano Research 2020年第8期13卷 2239-2245页

作者： Xiulei Shi Song Chen Meng-Yao Luo Biao Huang Guozhen Zhang Ran Cui Mingxi Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology430070WuhanChina Key Laboratory of Analytical Chemistry for Biology and Medicine(Ministry of Education) College of Chemistry and Molecular SciencesWuhan UniversityWuhan430072China iChEM(Collaborative Innovation Center of Chemistry for Energy Materials) Hefei National Laboratory for Physical Science at the MicroscaleUniversity of Science and Technology of ChinaHefei230026China

Lead sulfide(PbS)quantum dots(QDs)are important near infrared(NIR)luminescent materials with tunable and strong emission covering a broad NIR ***,their optical properties are quite sensitive to air,water,and high temperature due to the surface oxidation,thus limiting their applications in optoelectronic devices and biological ***,a cation-doping strategy is presented to make a series of high-quality Zn-doped PbS QDs with strong emission covering whole second near-infrared window(NIR-II,1,000-1,700 nm).First-principle calculations confirmed that Zn dopants formed dopant states and decreased the recombination energy gap of host ***,the Zn dopants significantly improved the quantum yield,photoluminescence lifetime and thermal stability of PbS ***,the PEGylated Zn-doped PbS QDs emitting in the NIR-llb window(1,500-1,700 nm)realized the noninvasive imaging of cerebral vascular of mouse with high resolution,being able to distinguish blood *** material not only provides a new tool for deep tissue fluorescence imaging,but is also promising for the development of other NIR related devices.

关键词： quantum dots doping second near-infrared window(NIR-II window) tunable emission in vivo imaging

来源：评论

学校读者我要写书评

暂无评论

Solid-state Stepwise Temperature-Programmable synthesis of Bioinspired Fe-N-C Oxygen Reduction Electrocatalyst Featuring Fe-N5 Configuration

SSRN

引用

SSRN 2024年

作者： Sang, Wei Chaemchuen, Somboon Zhang, Longyang Wang, Zechen Li, Xingchuan Nagasaka, Cocoro Andrew Xiong, Mo Ogiwara, Naoki Chen, Cheng Verpoort, Francis Mu, Shichun Kou, Zongkui State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan430070 China Department of Basic Science School of Arts and Sciences The University of Tokyo Komaba Meguro-ku Tokyo153-8902 Japan MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter School of Physics Xi’an Jiao tong University Xi’an710049 China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya572000 China

The bioinspired Fe-N-C features an asymmetric Fe-N5 configuration to produce active metal-oxygen intermediates by introducing axial N ligand into a symmetric Fe-N4 structure, enabling highly active oxygen reduction reaction (ORR). However, the artificial creation of active Fe-N5 configuration with a direct, facile and green method is still pendent, as current techniques involve complex processes and costly precursors. Herein, we develop a novel solid-state stepwise temperature-programmable (SST) route to directly produce bioinspired Fe-N5-C. We then demonstrate that Fe-N5-C exhibit a quite higher half-wave potential (0.92 V) with 22-fold faster ORR kinetics (15.6 mA cm−2 @ 0.85 V) than that of the commercial Pt/C counterpart. Indeed, we perform density functional theory (DFT) to find that the Fe is charged with an extra 0.1 e− through the axially coordinate N ligand, which significantly enhances the ability to activate O2 and enables an easier desorption of the crucial intermediate *OH on the Fe-N5 configuration over the conventional Fe-N4 structure. © 2024, The Authors. All rights reserved.

关键词： Density functional theory

来源：评论

学校读者我要写书评

暂无评论

Body-Comfort Cellulose Acetate-Based Textiles-Triboelectric Nanogenerators with Radiation Cooling and Moisture Permeability

SSRN

引用

SSRN 2024年

作者： Xu, Mei Chen, Zhicheng Hu, Ziyao Zhou, Cheng Fu, Xinming Song, Yiheng Wen, Xianjie Wang, Jinfeng Yin, Xianze College of Materials Science and Engineering National Local Joint Laboratory for Advanced Textile Processing and Clean Production Wuhan Textile University Wuhan430200 China Department of Anesthesiology The Second People’s Hospital of Foshan City Guangdong Province Foshan528000 China State Key Laboratory of New Textile Materials & Advanced Processing Technology Wuhan Textile University 430200 China

Wearable textile-triboelectric nanogenerators (t-TENGs) faced impediments in terms of the inadequate heat dissipation and moisture permeability performance. Specifically, actively heat-dissipating TENG devices exhibited intricacies, while passively heat-dissipating t-TENGs were considered unsatisfactory in sustaining optimal body temperature ranges for comfort. Herein, solvent-free titanium dioxide nanofluids (TiO2 nfs) were prepared to in-situ enhance the radiation cooling performance of electrospun TiO2 nfs@cellulose acetate (TiO2 nfs@CA) t-TENGs by grafting flexible chains on the TiO2 surface. TiO2 in the core layer of TiO2 nfs enhanced the infrared emission, hydrophilicity, and dielectric properties of TiO2 nfs@CA t-TENGs. Moreover, TiO2 nfs demonstrated a phase transition by absorbing energy within the physiological temperature ranges of the human body. TiO2 nfs enhanced the infrared emission, hydrophilicity, and dielectric properties of TiO2 nfs@CA t-TENGs by grafting flexible long chains ion on the TiO2 surface. The large-scale fabricated TiO2 nfs@CA membranes showcased remarkable radiation cooling performance (dropped 4 °C ~ 8 °C under 45 °C environments) in authentic and humid environments (like indoors, house and car). And TiO2 nfs@CA endowed a substantial enthalpy change within body temperature ranges, manifesting an exceptionally comfortable skin temperature (34 °C ~ 38 °C) even under scorching sunlight. Besides, TiO2 nfs@CA t-TENGs accurately monitored and pridicted foot movements in humid and enclosed environments by support vector machine (SVM). This made it promising as self-powered wearable devices. TiO2 nfs@CA t-TENGs provided a novel strategy for large scale fabricating of t-TENGs with comfort. © 2024, The Authors. All rights reserved.

关键词： Textiles

来源：评论

学校读者我要写书评

暂无评论

Interfacial Reaction Behavior of Titanium/Steel Composite Plate Formed by Cold-Hot Rolling

SSRN

引用

SSRN 2023年

作者： Bai, Yu-Liang Liu, Xue-Feng State Key Laboratory of Vanadium Titanium Resources Comprehensive Utilization Sichuan Panzhihua617000 China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Beijing100083 China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology Beijing Beijing100083 China Key Laboratory for Advanced Materials Processing of Ministry of Education University of Science and Technology Beijing Beijing100083 China

Titanium/steel composite plate was prepared by cold-hot rolling method. The influence of temperature on the interfacial reaction behavior of titanium/steel composite plate was studied by double beam focused ion beam system and spherical aberration correction transmission electron microscopy. The results show that the interfacial reaction of the cold-rolled titanium/steel composite plate mainly occurs in the heating stage, and the continuous intermetallic compounds layer formed at the interface during heating fractures during hot rolling. An interfacial layer composed of submicron TiC layer and α-Ti/α-Fe is formed when the hot rolling temperature is not higher than 850°C, and the interfacial bonding strength increases with the increase of rolling temperature. An interface layer composed of micro (FeTi+TiC)/Fe2Ti layer, nano FeTi/Fe2Ti layer and micro pores is formed when the hot rolling temperature exceeds 900°C. The interfacial micro (FeTi+TiC)/Fe2Ti layer and micro pores will seriously damage the interfacial bonding quality. © 2023, The Authors. All rights reserved.

关键词： Cold rolling

来源：评论

学校读者我要写书评

暂无评论

Hollow Multishelled Structure: synthesis Chemistry and Application

引用

Chemical Research in Chinese Universities 2024年第3期40卷 346-393页

作者： MAO Dan WANG Chao LI Wei ZHOU Liang LIU Jian ZHENG Zjian ZHAO Yong CAO An-min WANG Shutao HUANG Jiaxing HUO Fengwei CHEN Hongyu MAI Liqiang YU Ranbo WANG Lianzhou LU Yunfeng YU Chengzhong YANG Qihua YANG Zhenzhong ZENG Hua Chun ZHAO Hujun TANG Zhiyong ZHAO Dongyuan WANG Dan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChineseAcademy of SciencesBeijing 100190P.R.China Key Laboratory of Biopharmaceutical Preparation and Delivery Chinese Academy of SciencesBejing 100190P.R.China School of Fashion and Textiles The Hong Kong Polytechnic UniversityHong Kong SARP.R.China Department of Chemistry Fudan UniversityShanghai 200433P.R.China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070P.R.China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023P.R.China School of Chemistry Beihang UniversityBejing 100191P.R.China CAS Key Laboratory of Molecular Nanostructure and Nanotechnology and Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100190P.R.China CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190P.R.China School of Engineering Westlake UniversityHangzhou 310024P.R.China School of Flexible Electronics(Future Technologies) Nanjing Tech UniversityNanjing 211816P.R.China School of Science Westlake UniversityHangzhou 310024P.R.China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070P.R.China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083P.R.China School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbaneQueensland 4072Australia College of Life Science and Technology Bejing University of Chemical TechnologyBejing 100029P.R.China School of Chemistry and Molecular Engineering East China Normal UniversityShanghai 200241P.R.China College of Life Sciences Zhejiang Normal UniversityJinhua 321004P.R.China Department of Chemical Engineering Tsinghua UniversityBeijing 100

Hollow multishelled structure(HoMS),a promising and complex multifunctional structural system,features at least two shells that are separated by internal *** unique structure endows it with numerous advantages including low density,high loading capacity,large specific surface area,facilitated mass transport,and multiple spatial confinement *** the past twenty years,benefiting from the booming development of synthesis methods,various HoMS materials have been prepared and show promising applications in diverse areas.

关键词： Hollow multishelled structure synthesis chemistry Energy storage Catalysis Electromagnetic wave absorption Drug delivery Sensor

来源：评论

学校读者我要写书评

暂无评论

Deep Cryogenic Treatment on the Mechanical Properties of AlCrxFeNi1.5Cu0.5 High-Entropy Alloys

引用

Transactions of the Indian Institute of Metals 2025年第7期78卷 1-9页

作者： Li, Chunyan Chen, Tianyu Tang, Zihui Zhang, Shuyan Li, Xiaocheng Kou, Shengzhong State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of Technology Lanzhou China School of Materials Science and Engineering Lanzhou University of Technology Lanzhou China Wenzhou Engineering Institute of Pump & Valve Lanzhou University of Technology Wenzhou China National Institute of Extremely-Weak Magnetic Field Infrastructure Hangzhou China

High-entropy alloys (HEAs) have attracted extensive attention due to their unique compositional design and outstanding mechanical properties. Research indicates that these alloys maintain exceptional performance even at low temperatures, demonstrating great potential as structural materials for extreme environments. Recent studies reveal that deep cryogenic treatment can effectively enhance the ductility of HEAs. This work systematically investigates the influence of deep cryogenic treatment on the mechanical properties of AlCrxFeNi1.5Cu0.5 (x = 1.25,1.5) HEAs. The results show that deep cryogenic treatment significantly improves hardness and compressive strength. Specifically, the AlCr1.25FeNi1.5Cu0.5 alloy subjected to 48-h deep cryogenic treatment achieves a compressive strength of 2315.18 MPa while retaining a plastic strain of 17.4%. These findings suggest that optimized deep cryogenic treatment processes can enable HEAs to serve as high-performance, long-life next-generation structural materials.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Al-based metal-organic frameworks with densely hydroxyl-functionalized surface for one-step ethylene purification

引用

Separation and Purification technology 2025年 375卷

作者： Li, Zheng Zeng, Yilu Wu, Zeng Wang, Hao Liu, Ying Wang, Taohong Chen, Jingwen Chang, Ganggang Bao, Zongbi School of Chemistry Chemical Engineering and Life Science & State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China Key Laboratory of Biomass Chemical Engineering of the Ministry of Education College of Chemical and Biological Engineering Zhejiang University Hangzhou310027 China Co. Ltd. No. 19 Qiema North Road High-tech Zone Hebei Province Shijiazhuang City China School of Chemistry and Chemical Engineering Nanchang University Nanchang330031 China

Separating C2H6 from C2H6/C2H4 mixture holds significant importance in chemical manufacturing processes, yet remains technically demanding with substantial energy requirements. Metal-organic frameworks (MOFs), featuring tailorable pore sizes and functionalities, are highly effective in separating these mixtures. However, the lack of specially designed adsorption sites in C2H6-selective MOFs leads to weak interactions with C2H6 molecules, limiting their selectivity and productivity for C2H4. In addition, the traditional synthesis method yields MOF material as crystalline powder, causing dust and pressure drop in fixed beds, which hinder further applications. Actually, hydrogen bonds can function as highly efficient adsorption sites for gases, significantly enhancing the intermolecular hydrogen bonding interactions. Therefore, we proposed a "hydroxyl gradient regulation" strategy to successfully prepare the CAU-1 isomorphs employing organic linkers with varying number of hydroxyl functional groups, and their C2H6/C2H4 separation properties were investigated. Gas adsorption experiments and theoretical calculations confirmed that the obvious C2H6 selective adsorption of all CAU-1 isomorphs, among which CAU-1-(OH)2 exhibited moderate-high C2H6 uptake (3.61 mmol g−1) and selectivity (2) of C2H6/C2H4 (50:50, v:v) at 298 K and 1 bar, exceeding many previously reported materials. These outstanding results can be attributed to the favorable pore environments within the MOF, greatly strengthening the interactions with C2H6 through the incorporation of specific functional groups in the confined space. The precise binding sites for C2H6 were distinctly identified through density functional theory (DFT). Additionally, by using eco-friendly carboxymethyl cellulose (CMC) binder, the robust CAU-1-(OH)2@CMC maintained the excellent properties of one-step C2H4 purification (>99.9 %) during breakthrough tests, enhancing its industrial separation potential of C2H6/C2H4. © 2025 Elsevier

关键词： Binding sites

来源：评论

学校读者我要写书评

暂无评论

Body-Comfort Cellulose Acetate-Based Textiles-Triboelectric Nanogenerators with Radiation Cooling and Moisture Permeability

SSRN

引用

SSRN 2024年

关键词： Textiles

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：