检索结果-南通市图书馆

Review on friction stir welding of dissimilar magnesium and aluminum alloys: Scientometric analysis and strategies for achieving high-quality joints

引用

Journal of Magnesium and Alloys 2023年第11期11卷 4082-4127页

作者： Mohamed M.Z.Ahmed Mohamed M.El-Sayed Seleman Dariusz Fydrych Gürel ÇAM Department of mechanical engineering College of Engineering at Al KharjPrince Sattam Bin Abdulaziz UniversityAl Kharj 11942Saudi Arabia Department of Metallurgical and Materials engineering Faculty of Petroleum and Mining EngineeringSuez UniversitySuez 43512Egypt Faculty of mechanical engineering and Ship Technology Institute of Machines and Materials TechnologyGdańsk University of TechnologyGabriela Narutowicza Street 11/12Gdańsk 80-233Poland Department of mechanical engineering Iskenderun Technical UniversityIskenderunHatay 31200Turkiye

Magnesium and aluminum alloys continually attract interest as lightweight structural materials for transport applications. However, joining these dissimilar alloys is very challenging. The main obstacle that hinders progress in dissimilar Mg-Al joining is the formation of brittle intermetallic compounds(IMCs). As a solid-state joining technique, FSW is an excellent candidate to attenuate the deleterious IMC effects in dissimilar Al-Mg joining due to the inherent low heat inputs involved in the process. However, the IMCs, namely Al_(3)Mg_(2) and Al_(12)Mg_(17) phases, have also been reported to form during Al-Mg dissimilar FSW;their amount and thickness depend on the heat input involved;thus,the weld parameters used. Since the heat dissipated in the material during the welding process significantly affects the amount of IMCs,the heat input during FSW should be kept as low as possible to control and reduce the amount of IMCs. This review aims to critically discuss and evaluate the studies conducted in the dissimilar Al/Mg FSW through a scientometric analysis and also with a focus on the strategies recently applied to enhance joint quality. The scientometric analysis showed that the main research directions in Mg/Al FSW are the technological weldability of aluminum and magnesium during FSW, structural morphology, and mechanical properties of dissimilar welded joints. Considering the scope of application of the aforementioned joints, the low share of articles dealing with environmental degradation and operational cracking is surprising. This might be attributed to the need for well-developed strategies for obtaining high-quality and sustainable joints for applications. Thus, the second part of this review is conventional, focusing mainly on the new strategies for obtaining high-quality Mg/Al joints. It can be concluded that in addition to the necessity to optimum welding parameters to suppress the excessive heat to limit the amount and thickness of IMC formed and improv

关键词： Friction stir welding(FSW) Al-alloys Mg-alloys Dissimilar material welding Intermetallics Weld performance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hierarchical polypyrrole@cobalt sulfide-based flexible on-chip microsupercapacitors with ultrahigh energy density for selfcharging system

引用

Nano Research 2023年第1期16卷 555-563页

作者： Yan Zhao Jihua Zheng Jing Yang Wenjie Liu Fen Qiao Jiabiao Lian Guochun Li Tao Wang Jiangwei Zhang Limin Wu college of energy Material and Chemistry College of Chemistry and Chemical EngineeringInner Mongolia UniversityHohhot 010021China Institute for energy Research School of Energy&Power EngineeringJiangsu UniversityZhenjiang 212013China Department of Materials Science Fudan UniversityShanghai 200433China Key Laboratory of Power Station energy Transfer Conversion and System Ministry of EducationNorth China Electric Power UniversityBeijing 102206China

Herein,we prepare the unique hierarchical polypyrrole@cobalt sulfide(PPy-hs@CoS)hollow sphere-based nanofilms as interdigitated electrodes for flexible on-chip micro-supercapacitors(MSC).Benefiting from the excellent flexibility and high electrical conductivity of PPy-hs combined with the great electrochemical activity of CoS,such PPy-hs@CoS composite material can not only inhibit the volume expansion of PPy but also promote the diffusion of the electrolyte *** PPy-hs@CoS filmbased electrode delivers a greatly improved specific capacitance and small *** functional theory calculations infer that OH−prefers to bind to PPy on CoS@PPy and confirms the synergistic effect of each component for enhanced reaction kinetics.A quasi-solid-state on-chip flexible asymmetric MSC based on PPy-hs@CoS and activated carbon(AC)microelectrodes exhibits large areal-specific capacitance(131.9 mF/cm2 at 0.3 mA/cm2),ultrahigh energy density(0.041 mWh/cm2@0.224 mW/cm2 and 25.6 mWh/cm3@140.6 mW/cm3),and long cycle *** demonstrate the possibility to scale up the PPy-hs@CoS nanofilm microelectrode by arranging two of our asymmetric MSC in series and parallel connections,which respectively increase the output voltage and current.A self-charging system by connecting our asymmetric MSCs with a piece of commercial solar cells is developed as a potential possible mode for future highly durable and high-voltage integrated electronics.

关键词： polypyrrole cobalt sulfide adsorption energy on-chip micro-supercapacitor self-charging device

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Parametric optimization of friction stir welding process of age hardenable aluminum alloys-ANFIS modeling

引用

Journal of Central South University 2016年第8期23卷 1847-1857页

作者： D.Vijayan V.Seshagiri Rao Department of mechanical engineering Sri Chandrasekharendra Saraswathi Viswa Maha Vidyalaya Enathur Kanchipuram- 631561 Tamilnadu India St. Joseph's college of engineering Chennai - 600025 Tamilnadu India

A comparative approach was performed between the response surface method(RSM) and the adaptive neuro-fuzzy inference system(ANFIS) to enhance the tensile properties, including the ultimate tensile strength and the tensile elongation, of friction stir welded age hardenable AA6061 and AA2024 aluminum alloys. The effects of the welding parameters, namely the tool rotational speed, welding speed, axial load and pin profile, on the ultimate tensile strength and the tensile elongation were analyzed using a three-level, four-factor Box-Behnken experimental design. The developed design was utilized to train the ANFIS models. The predictive capabilities of RSM and ANFIS were compared based on the root mean square error, the mean absolute error, and the correlation coefficient based on the obtained data set. The results demonstrate that the developed ANFIS models are more effective than the RSM model.

关键词： aluminum alloys response surface method(RSM) adaptive neuro-fuzzy inference system(ANFIS) friction stir welding Box-Behnken design neuro fuzzy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Analysis and modeling of error of spiral bevel gear grinder based on multi-body system theory

引用

Journal of Central South University of Technology 2008年第5期15卷 706-711页

作者：陈书涵严宏志明兴祖 School of mechanical and Electrical engineering Central South UniversityChangsha 410083 China School of mechanical and Electrical engineering Central South University School of mechanical engineering Hunan University of Technology Zhuzhou 412008 China

Six-axis numerical control spiral bevel gear grinder was taken as the object, multi-body system theory and Denavit-Hartenberg homogeneous transformed matrix （HTM） were utilized to establish the grinder synthesis error model, and the validity of model was confirmed by the experiment. Additionally, in grinding wheel tool point coordinate system, the errors of six degrees of freedom were simulated when the grinding wheel revolving around C-axis, moving along X-axis and Y-axis. The influence of these six errors on teeth space, helix angle, pitch, teeth profile was discussed. The simulation results show that the angle error is in the range from -0.148 4 tad to -0.241 9 rad when grinding wheel moving along X, Y-axis; the translation error is in the range from 0.866 0 μm to 3.605 3μm when grinding wheel moving along X-axis. These angle and translation errors have a great influence on the helix angle, pitch, teeth thickness and tooth socket.

关键词： six-axis grinder spiral bevel gear error model analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

In Situ TiC/FeCrNiCu High-Entropy Alloy Matrix Composites:Reaction Mechanism,Microstructure and mechanical Properties

引用

Acta Metallurgica Sinica(English Letters) 2020年第8期33卷 1091-1102页

作者： Hao Wu Si-Rui Huang Cheng-Yan Zhu Ji-Feng Zhang He-Guo Zhu Zong-Han Xie college of Materials Science and engineering Nanjing University of Science and TechnologyNanjing 210094China School of mechanical engineering University of AdelaideSA 5005Australia School of engineering Edith Cowan UniversityJoondalupWA 6027Australia

In situ TiC particles-reinforced FeCrNiCu high-entropy alloy matrix composites were prepared by vacuum induction melting *** reaction mechanisms of the mixed powder(Ti,Cu and C)were analyzed,and the mechanical properties of resultant composites were ***4Tiwere formed in the reaction of Cu and Ti when the temperature rose to 1160 *** the temperature further increased to 1182 K,newly formed Cu4Tireacted with C to give rise to TiC particles as reinforcement *** apparent activation energy for these two reactions was calculated to be 578.7 kJ/mol and 1443.2 kJ/mol,*** hardness,tensile yield strength and ultimate tensile strength of the 15 vol%TiC/FeCrNiCu composite are 797.3 HV,605.1 MPa and 769.2 MPa,respectively,representing an increase by 126.9%,65.9%and 36.0%as compared to the FeCrNiCu high-entropy base alloy at room ***,the elongation-to-failure is reduced from 21.5 to 6.1%with the formation of TiC *** was revealed that Orowan mechanism,dislocation strengthening and load-bearing effect are key factors responsible for a marked increase in the hardness and strength of the high-entropy alloy matrix composites.

关键词： High-entropy alloy matrix composite TiC particle Reaction mechanism mechanical properties Strengthening mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of the radial blade loading distribution and B parameter on the type of flow instability in a low-speed axial compressor

引用

Chinese Journal of Aeronautics 2018年第7期31卷 1470-1479页

作者： Qiushi LI Simin LI Tianyu PAN National Key Laboratory of Science and Technology on Aero-Engine Aerothermodynamics Collaborative Innovation Center for Advanced Aero-Engine School of energy and Power engineering Beihang University Department of mechanical engineering and Materials Science Duke University

Previous studies showed that an axisymmetric hub-initiated disturbance defined as partial surge may initiate the stall of a transonic compressor; to reveal the instability evolution under full-span incompressible flow for different levels of hub loading and B parameter, an experimental investigation is conducted on a single-stage low-speed compressor. Experimental results show that under a uniform inflow condition without inlet flow distortion, a modal-type stall inception dominates in this low-speed compressor. When an inlet screen introducing hub distortion is used to increase the hub loading, a compressor stall is initiated by a modal wave, but large disturbances are present in the hub region before the compressor stall, which become stronger as the hub loading increases. Under high hub loading and large B parameter（implemented by adding hub distortion through an inlet screen and enlarging the outlet plenum volume, respectively）, a compressor stall is triggered by an axisymmetric hub-initiated disturbance, which is much different from the modal-like disturbances. The beginning of this axisymmetric disturbance may be captured over 800 rotor revolutions prior to the onset of stall, and the amplitude grows with time. The disturbance is hub-initiated because the disturbance signal at the hub is detected much earlier than that at the tip; meanwhile, the frequency of this axisymmetric disturbance changes with the length of the inlet duct. The characteristics of instability evolution in the low-speed compressor are also compared with those in a transonic compressor.

关键词： Axisymmetric disturbance B parameter Flow instability Low-speed axial compressor Radial blade loading distribution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

通过低浓度混合有机二硒化物和有机二碲化物有序串联促进安时级高能量密度锂硫电池中的硫氧化还原动力学（英文）

引用

Science China Materials 2025年第1期 207-216页

作者：周江奇舒程勇张千玉唐伟吴宇平 School of Chemical engineering and Technology Xi'an Jiaotong University School of Chemical engineering Kunming University of Science and Technology college of Materials Science and engineering Sichuan University School of energy and Environment Southeast University

均相氧化还原介质可以有效缓解多硫化锂在锂硫电池中的穿梭效应和缓慢的氧化还原动力学,但由于多硫化锂的多步转化需要串联催化的多功能活性位点,因此无法实现多硫化物锂的完美性能.基于氧化还原共介导原理,本文提出了一种混合有机二硒...

均相氧化还原介质可以有效缓解多硫化锂在锂硫电池中的穿梭效应和缓慢的氧化还原动力学,但由于多硫化锂的多步转化需要串联催化的多功能活性位点,因此无法实现多硫化物锂的完美性能.基于氧化还原共介导原理,本文提出了一种混合有机二硒化物和有机二碲化物（混合-Se/Te）的促进剂,以诱导串联催化并提升多硫化锂的有效电化学转化.具体而言,二苯二硒化物促进了多硫化锂与硫之间的固-液和液-液转化,而二苯二碲化物则改善了硫化锂沉积的固-液转化.因此,即使在6.5 mg cm-2的高硫负载和5.88μL mg-1的低电解液/硫比下,10 mM的低浓度混合-Se/Te促进剂也提供了6.6 mAh cm-2的高放电容量和在0.5 C下4.1 mAh cm-2的良好倍率性能.此外,组装的1.5 Ah级锂硫软包电池在0.05 C时提供了332 Wh kg-1的能量密度和良好的循环稳定性.我们的研究展示了利用分离活性位点推动连续硫转化反应的适用性，并预计将激发针对能量相关氧还原反应的动力学促进剂的深度分子设计.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Screw dislocations interacting with two asymmetrical interfacial cracks emanating from an elliptical hole

引用

Chinese Physics B 2013年第1期22卷 356-362页

作者：曾鑫方棋洪刘又文 P. H. Wen State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University college of mechanical and Vehicle engineering Hunan University School of engineering and Material Sciences Queen Mary University of London

The interaction between screw dislocations and two asymmetrical interfacial cracks emanating from an elliptic hole under loads at infinity is studied. The closed-form solution is derived for complex potentials. The stress intensity factor and the critical applied stress for the dislocation emission are also calculated. In the limiting cases, well-known results can be obtained from the present solutions. Moreover, new exact solutions for a screw dislocation interacting with some complicated cracks are derived. The results show that the shielding effect increases with the increase in the length of the other cracks and the minor semi axis, but decreases with the increase of dislocation azimuth. The repulsion acting on the dislocation from the other phase and the other crack extend in the horizontal direction, which makes the dislocation emission at the crack tip take place more easily, but the minor semi axis of the elliptical hole extending in the vertical direction makes it more difficult.

关键词： interfacial crack elliptic hole shielding effect dislocation emission

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Simultaneous measurement of CO_2 sorption and swelling of phosphate-based ionic liquid

引用

Green energy & Environment 2016年第3期1卷 258-265页

作者： Junfeng Wang Camille Petit Xiangping Zhang Ah-Hyung Alissa Park National Key Laboratory of Biochemical engineering Institute of Process Engineering Chinese Academy of Sciences Department of Chemical engineering Imperial College London Department of Earth & Environmental engineering Lenfest Center for Sustainable Energy Columbia University Department of Chemical engineering Lenfest Center for Sustainable Energy Columbia University

The development of alternative CO_2 capture solvents such as ionic liquids(ILs) and nanoparticle organic hybrid materials(NOHMs) have provided interesting options for CO_2 capture. In this study, CO_2 interactions with 1,3-dimethylimidazolium dimethylphosphate([MMIM]DMP),1-ethyl-3-methylimidazolium dimethylphosphate([EMIM]DMP) and 1-ethyl-3-methylimidazolium diethylphosphate([EMIM]DEP) that contain inorganic ester groups based on phosphate, were investigated using ATR FT-IR spectroscopy. CO_2-induced swelling, CO_2 diffusivity and CO_2 capture capacity were simultaneously measured to identify CO_2 capture mechanisms, kinetics and diffusion behaviors as a function of the alkyl chain length of the cation. Henry's law constants of CO_2 were found to be in the range of 4-11 MPa, which is in agreement with those reported in other studies.

关键词： CO2 capture ATR FT-IR spectroscopy Ionic liquids Mechanism Diffusivity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Electrically Conductive Concrete for Heating Using Steel Bars as Electrodes

引用

Journal of Wuhan University of Technology(Materials Science) 2010年第3期25卷 523-526页

作者：侯作富 School of mechanical engineering Yangtze University

The steel bars with good electrical conductivity were used as two kinds of electrodes in the making of carbon fiber（CF） electrically conductive concrete for *** results of the pertinent experiments illustrate the design is *** change in electrical resistivity over three years＇ hydration time was studied when steel bars were used as lateral face electrodes and top bottom surface electrodes *** temperature rise test was conducted to verify the heating properties of two kinds of *** only the study can reduce the CF volume content of electrically conductive concrete for heating to 0.58% or 0.36% according to different design,but also it will enhance the carrying capacity of the concrete roadway for heating.

关键词： steel bar carbon fiber electrical resistivity temperature rise

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：