检索结果-内蒙古大学图书馆

A comparative study on Al-Mg-Sc-Zr alloy fabricated by wire arc additive manufacturing with controlling interlayer temperature and continuous printing:Porosity,microstructure,and mechanical properties

引用

Journal of Materials science & technology 2024年第26期193卷 199-216页

作者： Xuru Hou Lin Zhao Shubin Ren Yun Peng Chengyong Ma Zhiling Tian Xuanhui Qu Beijing Advance Innovation Center for Materials Genome Engineering Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Central Iron and Steel Research Institute Beijing 100081China The Chinese Society for Metals Beijing 100081China

Wire arc additive manufacturing(WAAM)technique is a promising approach to producing large-scale metal components due to high deposition efficiency and low production ***,fundamental research about WAAM-processed Al-Mg-Sc-Zr alloy was still *** this study,Al-6.54Mg-0.36Sc-0.11Zr(wt%)components were successfully manufactured by WAAM with an interlayer temperature at 100℃(named IW)and continuous printing(named CP),and the corresponding porosity,microstructure,and mechanical properties of components were studied in *** porosity of components as-deposited was relatively low,about 0.385%and 0.116%,*** microstructures of the two components exhibited the same distribution characteristics in XZ and YZ planes:fine equiaxed grains(FEG)at remelted zone+FEG and coarse equiaxed grain(CEG)alternative distribution at middle zone+FEG at the top zone of the molten *** average grain size of component IW was about 10.51±6.01μm,and that of component CP significantly increased,to about 11.85±5.86μ*** short-circuit transition mode of cold metal transfer technology and the heterogeneous nucleation effect of primary Al3(Sc,Zr)and Al3(Sc,Zr,Ti)phases together promoted the formation of equiaxed grains and refined the *** heat treatment at 325℃and 6 h,nano-Al3Sc precipitated with a size of about 15-50 *** yield strength(YS)of components IW and CP increased from 171±3 to 261±1 MPa and 168±7 to 240±17 MPa,*** IW had the highest ultimate tensile strength,about 400±1 *** WAAMprocessed Al-Mg-Sc-Zr alloys,the contribution of the strengthening mechanism to YS was solid solution strengthening>precipitation strengthening>fine grain strengthening>dislocation strengthening.

关键词： Wire arc additive manufacturing Al-Mg-Sc-Zr alloy Porosity Microstructure Second phase Mechanical property

来源：评论

学校读者我要写书评

暂无评论

Low-cycle fatigue behavior of solutionized and aged WE43 magnesium alloys at room temperature

引用

Journal of Magnesium and Alloys 2024年第6期12卷 2284-2297页

作者： Yong Cai Jianxiong Wei Hong Yan Yipeng Chen Rongshi Chen School of Materials Science and Engineering University of Science and Technology of China72 Wenhua RoadShenyang 110016China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdaoShandong 266590China

The low-cycle fatigue behavior of solutionized(T4)and aged(T6)WE43 magnesium alloys was studied at room *** total strain amplitudes(△ε_(t)/2)were 0.4%,0.5%,0.6%,0.7%and 1.0%.Detailed microstructure evolution was characterized by scanning electron microscope(SEM),electron backscattered diffraction(EBSD)and transmission electron microscopy(TEM).The results showed that plastic strain amplitude decreased with the increasing cycle number in T4 alloy,which is due to the dense persistent slip bands(PSBs)and dynamic precipitates hinderingdislocation *** contrast,the plastic strain amplitude increases gradually in T6 alloy,which is attributed to the enhanced activation of pyramidal *** low-cycle fatigue life of T6 alloy with larger fatigue ductility coefficient is longer than that of T4 *** Coffin-Manson model can accurately predict the fatigue life of T4 and T6 alloys compared to Jahed-Varvani(JV)energy *** T4 alloy,the fatigue damage mechanism was dominated by basal *** T6 alloy,the enhanced pyramidal slip plays an important role to accommodate plastic deformation.

关键词： Low-cycle fatigue WE43 alloy Cyclic hardening/softening JV model Dislocation

来源：评论

学校读者我要写书评

暂无评论

Organic X-Ray Image Sensors Using a Medium Bandgap Polymer Donor with Low Dark Current

引用

Energy & Environmental Materials 2024年第6期7卷 230-237页

作者： Jong-Woon Ha Seung Hun Eom Bo Kyung Cha Seyeong Song Hyeong Ju Eun Jong H.Kim Jong Mok Park BongSoo Kim Byoungwook Park Seo-Jin Ko Sung Cheol Yoon Changjin Lee In Hwan Jung Do-Hoon Hwang Department of Chemistry Chemistry Institute for Functional MaterialsPusan National UniversityBusan 46241Korea Division of Advanced Energy Materials Research Center Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Korea Electro-Medical Device Research Center Korea Electrotechnology Research Institute(KERI)Ansan 15588Korea Graduate School of Carbon Neutrality School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Molecular Science and Technology Ajou UniversitySuwon 16449Korea Research Center for Advanced Specialty Chemicals Korea Research Institute of Chemical TechnologyUlsan 44412Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Organic and Nano Engineering Human-Tech Convergence ProgramHanyang University222 Wangsimni-roSeongdong-guSeoul 04763Korea

The development of portable X-ray detectors is necessary for diagnosing fractures in unconscious patients in emergency ***,this is quite challenging because of the heavy weight of the scintillator and silicon *** weight and thickness of X-ray detectors can be reduced by replacing the silicon layer with an organic *** study presents a novel bithienopyrroledione-based polymer donor that exhibits excellent photodetection properties even in a thick photoactive layer(~700 nm),owing to the symmetric backbone and highly soluble molecular structure of *** ability of bithienopyrroledione-based polymer donor to strongly suppress the dark current density(Jd~10−10 A cm^(−2))at a negative bias(−2.0 V)while maintaining high responsivity(R=0.29 A W−1)even at a thickness of 700 nm results in a maximum shot-noise-limited specific detectivity of D_(sh)^(*)=2.18×10^(13)Jones in the organic *** organic photodetectors are developed by slot-die coating for use in X-ray detectors,which exhibit D_(sh)^(*)=2.73×10^(12)Jones with clear rising(0.26 s)and falling(0.29 s)response times upon X-ray *** reliability is also proven by linear response of the X-ray detector,and the X-ray detection limit is 3 mA.

关键词： low dark current low detection limit organic photodetector printable X-ray

来源：评论

学校读者我要写书评

暂无评论

Chlorinated Effects of Double-Cable Conjugated Polymers on the Photovoltaic Performance in Single-Component Organic Solar Cells

引用

Chinese Journal of Polymer science 2023年第2期41卷 187-193页

作者： Han-Yi Bao Zhao-Fan Yang Yan-Jiao Zhao Xiang Gao Xin-Zhu Tong Yi-Nuo Wang Feng-Bo Sun Jian-Hong Gao Wei-Wei Li Zhi-Tian Liu Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials Hubei Key Laboratory of Plasma Chemistry and Advanced MaterialsSchool of Materials Science and EngineeringWuhan Institute of TechnologyWuhan430205China Beijing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-Inorganic Composite Beijing University of Chemical TechnologyBeijing100029China

The recently emerged double-cable conjugated polymers have come into focus due to their significantly improved power conversion efficiencies (PCEs) in single-component organic solar cells (SCOSCs). In this work, the effect of chlorination in double-cable conjugated polymers with linear benzodithiophene backbone and pendant perylene bisimide on the photovoltaic performance in SCOSCs has been studied. After introducing chlorine atoms into conjugated side chains, the highest occupied molecular orbital level of the conjugated polymers is down-shifted, thus resulting in a higher open-circuit voltage. As a result, the chlorinated double-cable conjugated polymer exhibits improved photovoltaic performance from 3.46% to 3.57%.

关键词： Double-cable conjugated polymer Chlorination Single-component organic solar cells

来源：评论

学校读者我要写书评

暂无评论

Design and Implementation of a High-Efficiency 5W Ku-Band Power Amplifier Using a Bare Die GaN HEMT for Satellite Uplink Applications 11

Design and Implementation of a High-Efficiency 5W Ku-Band Po...

引用

11th International Symposium on Telecommunication, IST 2024

作者： Rafiei, Ehsan Azimi, Amin Nayyeri, Vahid Baee, Roghieh Karimzadeh Iran University of Science and Technology School of Advanced Technologies Tehran Iran ICT Research Institute Communication Technology Research Center Tehran Iran

ISBN: (纸本)9798350356250

This paper presents a Ku-band 5W Power Amplifier (PA) using a bare die Gang high electron mobility transistor (HEMT). The circuit was implemented using microwave-integrated circuit (MIC) technology. Wirebonds have been implemented using 25-micron gold wire on a Rogers 4003C substrate with a thickness of 0.1 mm. Simulation modeling of wirebonds was validated using passive test circuits. Experimental results demonstrate that the PA operates in the 12.5 to 13.5 GHz frequency range, with output power, drain efficiency, and gain of higher than 5W, 40%, and 5 dB, respectively under continuous wave (CW) operation, which is suitable for uplink satellite communication applications. © 2024 IEEE.

关键词： Gallium nitride

来源：评论

学校读者我要写书评

暂无评论

Efficient generation of polarization multiplexed OAM using levitated metasurfaces

引用

Frontiers of physics 2025年第1期20卷 253-261页

作者： Sihan Cui Xiaojun Huang Cuizhen Sun Helin Yang Xiaoyan Li College of Communication and Information Engineering Xi’an University of Science and TechnologyXi’an 710054China Engineering Research Center of Smart Coal Mine Advanced Communication Technology Universities of Shaanxi ProvinceXi’an 710054China College of Physical Science and Technology Central China Normal UniversityWuhan 430079China College of Physical Science and Technology Northwestern Polytechnical UniversityXi’an 710129China

Dual-polarization(DP)vortex waves(VWs)are widely applied in optical,electromagnetic,and quantum science owing to their ability to simultaneously convey two distinct and non-interfering orbital angular momentums(OAMs).Here,we propose a lightweight levitated meta-atom to achieve 360°phase control with a difference of no more than 1°while maximizing the reflection *** combination with convergent phase modulation,a OAM metasurface array that facilitates the generation of DP VWs with high mode purity and low divergence angles was *** measured DP VW bearing mode l=1 had only 4°divergence angle and 84%mode purity at 5.8 ***,DP VWs with integer,fractional(l=1.5)and higher order(l=8)modes are discussed based on an OAM purity spectrum *** experimental results were consistent with the simulation results,demonstrating the practicality of the proposed DP OAM metasurface and its potential applications in the field of multithreaded communication systems.

关键词： dual-polarization orbital angular momentum low divergence angles high mode purity

来源：评论

学校读者我要写书评

暂无评论

Effective CO_(2)activation of enriched oxygen vacancies for photothermal CO_(2)methanation

引用

Journal of Materials science & technology 2024年第22期189卷 203-210页

作者： Peipei Du Guoqiang Deng Zhonghua Li Junchuan Sun Lu Wang Yongqiang Yang Jun Wang Yaguang Li Xiaoming Xu Yuanming Zhang Wangxi Liu Gang Liu Zhigang Zou Zhaosheng Li Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State MicrostructuresCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210093China Jiangsu Key Laboratory of Nano Technology Nanjing UniversityNanjing 210093China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Science and Engineering The Chinese University of Hong KongShenzhen 518172China Research Center for Solar Driven Carbon Neutrality Engineering Research Center of Zero-carbon Energy Buildings and Measurement TechniquesMinistry of EducationThe College of Physics Science and TechnologyInstitute of Life Science and Green DevelopmentHebei UniversityBaoding 071002China

Oxygen vacancies have been widely concerned with the facilitation effects of CO_(2)activation for CO_(2)***,little attention has been paid to the generation of active intermediate species induced by enriched oxygen ***,we discovered that CeNiO_(3−δ)catalyst enriched oxygen vacancies can efficiently activate CO_(2)and realize high activity for photothermal CO_(2)*** situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)proved that oxygen vacancies are beneficial to the formation of reactive intermediate species of polydentate carbonate over CeNiO_(3−δ),which is crucial for efficient CO_(2)*** results revealed mechanistic insights into how effective CO_(2)activation induced by oxygen vacancies can be manipulated by adjusting the adsorption intermediate species.

关键词： Oxygen vacancies CO_(2)activation Active intermediate species Photo-thermal CO_(2)methanation CeNiO_(3)

来源：评论

学校读者我要写书评

暂无评论

The atomic interface effect of single atom catalysts for electrochemical hydrogen peroxide production

引用

Nano research 2023年第8期16卷 10724-10741页

作者： Kaiyuan Liu Pengwan Chen Zhiyi Sun Wenxing Chen Qiang Zhou Xin Gao State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Advanced Technology Research Institute Beijing Institute of TechnologyJinan 250307China Energy&Catalysis Center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China China Academy of Ordnance Science Beijing 100089China

Producing hydrogen peroxide(H_(2)O_(2))through an electrochemical oxygen reduction reaction(ORR)is a safe,green strategy and a promising alternative to traditional energy-intensive anthraquinone *** and renewable power could be utilized for onsite and decentralized H_(2)O_(2)production,demonstrating significant application ***,single atom catalysts(SACs)have demonstrated significant advantages in the catalytic production of H_(2)O_(2)in 2e−***,the selectivity of SACs in ORR once puzzled *** article reviews the research on the development and achievements of H_(2)O_(2)production by SACs catalysis in recent ***,the structure-performance relationship is a guide to designing new *** advanced characterization techniques and theoretical calculation methods,researchers have a clearer and more thorough understanding of the impact of the atomic interface of SACs on ORR catalytic *** coordination moiety formed between the active metal center atom and the support seriously determines the selectivity of SACs,mainly manifested in the adsorption of*OOH ***,the atomic interface of metal atoms together with O/N co-coordination exhibit high selectivity and mass activity,and heteroatoms or functional groups on carbon supports present synergistic effects to promote the production of H_(2)O_(2)in 2e−*** and accurate regulation of the atomic interface of SACs directly affects the 2e−ORR performance of the ***,it is important to deeply understand the atomic interface of SACs and contribute to the development of novel catalysts.

关键词： single atom catalysts(SACs) atomic interface effect hydrogen peroxide(H_(2)O_(2))production electrochemical catalysis

来源：评论

学校读者我要写书评

暂无评论

Influence of rare earth cerium on the microstructures and performances of Al-Fe alloy

引用

science China(Technological sciences) 2023年第11期66卷 3317-3327页

作者： LI ShiXin JIANG HongXiang LI YanQiang ZHANG LiLi SUN Hao HE Jie JIANG HaiCang ZHAO JiuZhou Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Binzhou Institute of Technology Binzhou 256606China Shandong Key Laboratory of Advanced Aluminium Materials and Technology Binzhou 256606China

The effects of rare earth addition on the microstructures as well as the tensile performances and electrical conductivity of Al alloys have attracted increasing attention ***,little research has been carried out to investigate the influence of minor Ce(the Ce additive amount is below 0.1 wt.%).In this study,experiments have been performed to explore the effects of minor Ce on the microstructures as well as the tensile properties and the electrical conductivity of Al-Fe *** results demonstrate that minor rare earth Ce addition not only leads to the α-Al refinement and the modification of Al_(13)Fe_(4) minority phase,but also decreases the solid solubility of *** grain refinement induced by Ce addition has a negligible influence on the tensile strength and yield strength,while the ductility and conductivity can be simultaneously ascended by adding rare earth *** modification of Al_(13)Fe_(4) minority phase is responsible for the increment of ductility,and the diminution of Si solid solubility in the Al matrix leads to the increase of electrical *** work provides a strategy for concurrently improving the tensile performances and electrical conductivity of aluminum alloy.

关键词： aluminum alloy rare earth cerium microstructure conductivity property tensile performance

来源：评论

学校读者我要写书评

暂无评论

Effects of Al and C content on κ-carbide precipitation and strengthening in high-Mn low-density steels: A quantitative study

引用

China Foundry 2025年

作者： Yu-xiang Liu Tao Xu Jian-lei Zhang Feng-hui An Gang Chen Chang-jiang Song Qi-jie Zhai Center for Advanced Solidification Technology (CAST) School of Materials Science and Engineering Shanghai University Shanghai Engineering Research Center for Integrated Circuits and Advanced Display Materials Shanghai University Jiujiang Engineering Research Center of Advanced Welding Jiujiang University Ningbo Branch of Chinese Academy of Ordnance Science

Fe-28Mn-(10-12)Al-(0.8-1.4)C(wt.%)steelsweredesignedtoinvestigatetheinfluenceof varying Al and C content on precipitation behavior ofκ-carbide and its contribution to the strength of high-Mn low-density steels. Results reveal that both Al and C elements promoteκ-carbide precipitation, with C having a more pronounced effect. In near-rapidly solidified 10Al steel strips, increasing C content from 0.8wt.%to1.4wt.%raises theκ-carbide size from 9.6 nm to 38.2 nm, accompanied by volume fraction increase from10.2vol.%to 29.8vol.%. In comparison, the average size and volume fraction ofκ-carbides in 12Al0.8C steel are only 11.4 nm and 17.8vol.%, respectively. Higher Al and C content reduces the lattice mismatch between austenite andκ-carbides, thus promoting nucleation ofκ-carbides. Notably, the increase in C content results in a greater reduction in the Gibbs free energy ofκ-carbide, leading to a stronger driving force forκ-carbide formation. Consequently, as the C content increases from 0.8wt.%to 1.4wt.%, the interaction betweenκ-carbides and dislocations transforms from particle cutting to bypassing, and the maximum precipitation strengthening ofκ-carbides reaches 583 MPa. The construction of the relationship between Al and C contents andκ-carbide precipitation in this study would provide valuable insights for alloy design of high-Mn steels.

关键词：

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：