检索结果-内蒙古大学图书馆

Interfacial microstructure and mechanical behavior of Mg/Cu bimetal composites fabricated by compound casting process

引用

Transactions of Nonferrous Metals Society of China 2019年第6期29卷 1233-1241页

作者： De-xing XU Chang-lin YANG Kang-ning ZHAO Hong-xiang LI Ji-shan ZHANG State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi’an 710072 China

Mg/Cu bimetal composites were prepared by compound casting method, and the microstructure evolution, phase constitution and bonding strength at the interface were *** is found that a good metallurgical bonding can be achieved at the interface of Mg and Cu,which consists of two sub-layers,i.e.,layer I with 30μm on the copper side composed of Mg2Cu matrix phase, on which a small amount of dendritic MgCu2 phase was randomly distributed;layerⅡ with 140μm on the magnesium side made up of the lamellar nano-eutectic network Mg2Cu+(Mg) and a small amount of detached Mg2Cu phase. The average interfacial shear strength of the bimetal composite is measured to be 13 *** study provides a new fabrication process for the application of Mg/Cu bimetal composites as the hydrogen storage materials.

关键词： Mg/Cu bimetal composites compound casting interfacial bonding mechanism interfacial microstructure interfacial mechanical behavior

来源：评论

学校读者我要写书评

暂无评论

Rational design of TA/rGO/CNFs aerogel films as self-supporting cathodes for high-performance zinc-ion hybrid capacitors

引用

Journal of Energy Storage 2025年 125卷

作者： Yu, Xiuwen Liu, Qifan Shi, Shuangyu Zang, Limin Qiu, Jianhui He, Minhua Yang, Chao MOE Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guangxi Colleges and Universities Key Laboratory of Natural and Biomedical Polymer Materials Guilin University of Technology Guilin541004 China Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization Guangxi Minzu University Nanning530006 China Department of Machine Intelligence and Systems Engineering Faculty of Systems Science and Technology Akita Prefectural University Yurihonjo015-0055 Japan Guangxi Huazheng New Energy Technology Co. Ltd. Chongzuo532299 China

Wearable flexible electronic devices have been developed rapidly driven by their distinctive characteristics, such as portability, flexibility, comfort, and diverse forms. However, the accelerated pace of technological advancement leads to a considerable increase in non-biodegradable electronic waste, which has a detrimental impact on the natural environment. In this study, flexible aerogel films consisting of tannic acid (TA), reduced graphene oxide (rGO) and cellulose nanofibers (CNFs) were prepared through a simultaneous hydrothermal reduction and self-assembly strategy. As a natural polyphenol, TA can serve as a reducing agent for GO and provide extra capacity owing to its catechol and pyrogallol units. CNFs with large length-to-diameter ratio and oxygen groups can effectively prevent rGO restacking and promote electrolyte penetration. The flexible zinc-ion hybrid capacitors based on the aerogel film cathode and zinc foil anode have excellent electrochemical properties and flexibility. In light of environmentally friendly components, green preparation processes and superior electrochemical performance, this research can pave the way for further development of environmentally friendly aerogel film electrodes for high-performance wearable electronics. © 2025 Elsevier Ltd

关键词： Cellulose films

来源：评论

学校读者我要写书评

暂无评论

Cavity-Quantum Electrodynamics with Moiré Flatband Photonic Crystals

arXiv

引用

arXiv 2024年

作者： Wang, Yu-Tong Ye, Qi-Hang Yan, Jun-Yong Qiao, Yufei Chen, Chen Cheng, Xiao-Tian Li, Chen-Hui Zhang, Zi-Jian Huang, Cheng-Nian Meng, Yun Zou, Kai Zhan, Wen-Kang Zhao, Chao Hu, Xiaolong Tee, Clarence Augustine T.H. Sha, Wei E.I. Huang, Zhixiang Liu, Huiyun Jin, Chao-Yuan Ying, Lei Liu, Feng State Key Laboratory of Extreme Photonics and Instrumentation College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China School of Physics Zhejiang Key Laboratory of Micro-nano Quantum Chips and Quantum Control Zhejiang University Hangzhou310027 China School of Precision Instrument and Optoelectronic Engineering Tianjin University Tianjin300072 China Key Laboratory of Optoelectronic Information Science and Technology Ministry of Education Tianjin300072 China Laboratory of Solid State Optoelectronics Information Technology Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Science Beijing101804 China College of Physics and Electrical Information Engineering Zhejiang Normal University Hangzhou310058 China Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei230039 China Department of Electronic and Electrical Engineering University College London LondonWC1E 7JE United Kingdom International Joint Innovation Center Zhejiang University Haining314400 China

Quantum emitters are a key component in photonic quantum technologies. Enhancing their single-photon emission by engineering the photonic environment using cavities can improve the overall efficiency in quantum information processing. However, this enhancement is often limited by the need for precise nanoscale control over emitter’s position within micro/nano-cavities. Inspired by the fascinated physics of moiré pattern, we present an approach to strongly modify the spontaneous emission rate of a quantum emitter using fine-designed multilayer moiré photonic crystal with a robust isolate-flatband dispersion. Theoretical analysis reveals that due to its nearly infinite photonic density of states, the moiré cavity can simultaneously possess high Purcell factor and large tolerance over emitter’s position. We experimentally demonstrate the coupling between this moiré cavity and a quantum dot via the cavity-determined polarization of the dot’s emission. The radiative lifetime of the quantum dot can be tuned by a factor of 40 from 42 ps to 1692 ps, attributed to strong Purcell enhancement and Purcell inhibition effects. Our findings pave the way for moiré flatband cavity-enhanced quantum light sources, quantum optical switches and quantum nodes for quantum internet. Copyright © 2024, The Authors. All rights reserved.

关键词： Particle beams

来源：评论

学校读者我要写书评

暂无评论

Deformation behavior of metastable Ti-10V-2Fe-3Al alloy subjected to varying pre-strain levels: Mechanism and microstructural adaptations

引用

Journal of Alloys and Compounds 2025年 1029卷

作者： Zhu, E. Li, Fuguo Zhao, Qian Yuan, Zhanwei You, Junda Hashmi, Anisah Farooq State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Xi'an710072 China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical University Xi'an710072 China School of Materials Science and Engineering Chang'an University Shaanxi Xi'an710061 China

This study examined the deformation behavior of the full β metastable Ti-10V-2Fe-3Al (Ti-1023) alloy under tensile loading and unloading conditions, with varying levels of pre-strain. The effects of tensile deformation on the microstructure were investigated using X-ray diffraction (XRD), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) techniques. The results indicated that there is nonlinear recovery in the unloading curve of metastable Ti-1023 alloy. With the increase of pre-strain, the degree of stress-induced martensite transformation (SIMT) increases, and a significant amount of residual α" phase persisted in the alloy following unloading, thereby inducing a gradual reduction in the recovery strain. The stress-induced martensite transformation (SIMT) occurs at the onset of the deformation process, with the α" martensite penetrating the β grain boundaries as it extends, and martensite with different orientations coordinates local strain through reorientation twins, which affects the variant selection of martensite. As the strain increases, the deformation twinning associated with plastic deformation, namely {130} α" and {110} α", also increases. Through the calculation of the complexity of atomic shuffling and the shear magnitude, the mechanism of the simultaneous observation of the {130}α" and its reciprocal {110}α" twinning mode during the deformation of metastable Ti-1023 alloy was elucidated. © 2025 Elsevier B.V.

关键词： Metastable β titanium alloy Microstructural adaptations Strain recovery Twinning Variant selection

来源：评论

学校读者我要写书评

暂无评论

Hierarchical MgAl 2 O 4 /Al 3 Ti nucleating agents induce full equiaxed grains in laser-powder-bed-fused Al alloys

引用

Scripta Materialia 2025年 266卷

作者： Zhendong Jia Qiaonan Shu Biao Chen Fangqi Liu Lei Jia Pingxiang Zhang Jinshan Li State Key Laboratory of Solidification Processing School of Materials Northwestern Polytechnical University Xi’an 710072 China School of Materials Science and Engineering Xi'an University of Technology Xi'an 710048 China Superconducting Materials Research Center Northwest Institute for Non-ferrous Metal Research Xi'an 710016 China

Laser powder bed fusion (LPBF) provides high design freedom for high-strength aluminum alloys in aerospace and automotive industries. However, the rapid solidification of LPBF results in a critical microstructural challenge in aluminum alloys: coarse columnar grains with anisotropy and cracking. In this work, we employ the synergistic effect of magnesium and titanium elements in aluminum alloys for building self-assembled MgAl 2 O 4 /Al 3 Ti hierarchical architectures as a highly efficient nucleation agent. In-situ MgAl 2 O 4 nanoparticles offer coherent interfaces (lattice mismatch: 0.05 %) for the nucleation of L1 2 -structured Al 3 Ti phase, facilitating the formation of fully equiaxed grains with random orientations in aluminum alloys. Aberration-corrected transmission electron microscopy demonstrates atomic-scale coherence at MgAl 2 O 4 /Al 3 Ti interfaces, confirming MgAl 2 O 4 as effective nucleation substrates for Al 3 Ti phase. Our study provides a new microstructure-design strategy for LPBF, achieving aluminum alloys with fully equiaxed grains.

关键词： Aluminum alloys

来源：评论

学校读者我要写书评

暂无评论

Effect of wire feed rate on microstructure and mechanical properties of Mg-Gd-Y-Zn-Zr alloy fabricated via cold metal transfer wire-arc additive manufacturing(CMT-WAAM)

引用

Journal of Alloys and Compounds 2025年 1029卷

作者： Ju, Ruifeng Li, Yunlong Zhao, Zhanyong Wang, Liqing Ma, Kai Zhang, Dongdong Wei, Shouzheng Zhang, Zhen Fan, Wei Lin, Xin Bai, Peikang School of Materials Science and Engineering North University of China Taiyuan030051 China Taiyuan University of Science and Technology Taiyuan030602 China State Key Laboratory of Solidification Processing Northwestern Polytechnical University Shanxi Xi'an710072 China

Cold Metal Transfer Wire-Artic Additive Manufacturing (CMT-WAAM) demonstrates significant potential for magnesium alloy fabrication, particularly for large-scale and geometrically complex components, owing to its low heat input, high deposition efficiency, and capability for direct complex structure production. This study systematically examines the influence of varied wire feeding rates (11, 12, 13, and 14 m/min) on the microstructural evolution and mechanical performance of Mg-Gd-Y-Zn-Zr alloy fabricated via CMT-WAAM. Crucially, heat input variations induced by different wire feeding rates were found to substantially dictate material characteristics. Microstructural characterization revealed equiaxed grain formation in the as-deposited Mg-Gd-Y-Zn-Zr alloy, with grain size exhibiting an increasing gradient along the deposition direction across all tested parameters. Phase analysis identified three primary constituents: the α-Mg matrix, β-(Mg, Zn)3(Gd, Y) eutectic phase, and rare earth (RE)-enriched cubic phases. Notably, increased heat input correlated with expanded regions containing long-period stacking ordered (LPSO) phases. The mechanical properties of CMT-WAAM processed Mg-Gd-Y-Zn-Zr alloy surpassed those of traditionally cast Mg-RE counterparts under all tested conditions. Optimal performance was achieved at a wire feeding rate of 13 m/min, demonstrating exceptional anisotropic uniformity with ultimate tensile strengths (UTS) of 260 MPa (build direction) and 259 MPa (travel direction), yield strengths (YS) of 195 MPa and 192 MPa, and elongations (EL) of 7.95 % and 8.92 %, respectively. These findings highlight the critical role of wire feeding rate in regulating thermal dynamics and resultant material properties for CMT-WAAM processed Mg-RE alloys. © 2025 Elsevier B.V.

关键词： Tensile strength

来源：评论

学校读者我要写书评

暂无评论

Enhanced ablation resistance and mechanical properties of C MP /C-HfC composites contributed by dual-skeleton reinforcement and coating protection

引用

Composites Part B: Engineering 2025年

作者： Huafeng Quan Wei Li Dong Huang Woqian Gao Shanying Sui Yuefeng Zhang Hua Liu Ziwen Gu Zhen Fan Jinshui Liu Chong Ye College of Materials Science and Engineering Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Changsha 410082 PR China Hunan Province Engineering Research Center for High Performance Pitch-based Carbon Materials Hunan Toyi Carbon Material Technology Co. Ltd. Changsha 410000 PR China Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science College of Chemistry and Chemical Engineering Central South University Changsha 410083 PR China Key Laboratory of Advanced Functional Composite Materials Aerospace Research Institute of Materials and Processing Technology Beijing 100076PR China

High-thermal-conductivity mesophase pitch-based carbon fiber reinforced carbon (HTC-C MP /C) composites encounter severe challenges with intrinsic oxidation and thermal ablation at ultra-high temperature, thus enhancing their thermal protection performance is crucial for stable operation. In this study, a dual-skeleton reinforced C MP /C-HfC composites were fabricated via reactive melt infiltration, and the ZrC/SiC@C MP /C-HfC composites were simultaneously prepared based on a coating-matrix integration strategy. The results show that the prepared C MP /C-HfC composites exhibit flexural strengths of =169.03 MPa and =247.15 MPa, representing 52.8% and 63.04% improvements over C MP /C composites, respectively. The mass ablation rate and linear ablation rate are 0.367 mg·s -1 and -1.167 μm·s -1 , showing 86.1% and 107.5% reductions compared to C MP /C composites. Moreover, the ZrC/SiC coating further effectively mitigates ablation-induced powdering and spalling in C MP /C-HfC composites while enhancing both thermal conductivity and flexural mechanical properties. This balanced enhancement of mechanical-thermal-ablative protection performances relies on the synergistic effects of the dual-skeleton structure combining continuous HfC framework and HTC-C MP /C skeleton, and effective thermal protection of the coating system. This work provides novel insights and valuable references for thermal protection design in C MP /C composites.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Introducing a Single Crystal Structure in Polycrystalline Inconel 718 Superalloy Via Laser Directed Energy Deposition

SSRN

引用

SSRN 2022年

作者： Li, Zuo Lin, Xin Zhao, Xuan Ma, Xu Hao, Zhiwei Yao, Bo Zhong, Chongliang Gasser, Andres Tan, Hua Sui, Shang Chen, Jing State Key Laboratory of Solidification Processing Northwestern Polytechnical University 127 Youyixilu Shaanxi Xi’an710072 China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT China Northwestern Polytechnical University 127 Youyixilu Shaanxi Xi’an710072 China Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Polytechnical University Shaanxi Xi’an710072 China Fraunhofer Institute for Laser Technology ILT Steinbachstr. 15 Aachen52074 Germany Northwestern Polytechnical University China

The grain boundaries have always been the accomplice in deteriorating high-temperature mechanical properties of alloys because the bonding strength of grain boundaries is lower than that of internal grains at high temperature. Reducing or even eliminating the transverse grain boundary perpendicular to the stress axis is the best choice to boost the high-temperature mechanical properties of Inconel 718 alloy without changing the alloy composition. Herein, Inconel 718 single-wall specimen (height: 20 mm) with a single crystal (SX) structure was successfully prepared by laser directed energy deposition (LDED) for the first time. Except for few stray grains (SGs) on the top region, the rest are all SX structure. Subsequently, the stress rupture life at 650 °C of sample subjected to direct aging treatment was tested and up to 180 h, far exceeding the measured value of the forging (110 h). This indicates that imparting SX structure to Inconel 718 polycrystalline alloy is beneficial to improve high-temperature mechanical properties. At last, the formation of SG during LDED process were elucidated combined numerical simulation and solidification theory, revealing that it is primarily affected by the angle ψmax between normal direction to the side edge of melt pool and [001] direction. The melt pool with shallower and flatter shape could facilitate the formation of SX. Moreover, the effect of liquid flow on the dendrite deflection was also investigated and found that employing reciprocating scanning strategy between layers could inhibit this affection. © 2022, The Authors. All rights reserved.

关键词： Grain boundaries

来源：评论

学校读者我要写书评

暂无评论

Focus on performance of perovskite light-emitting diodes

引用

Frontiers of Optoelectronics 2020年第3期13卷 235-245页

作者： Peipei DU Liang GAO Jiang TANG State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China

Perovskite-based optoelectronic devices,espe-cially perovskite light-emitting diodes(PeLEDs)and perovskite solar cells,have recently attracted considerable *** National Renewable Energy laboratory(NREL)chart inspires us to develop a counterpart for *** this study,we collect the record performance of PeLEDs including several new entries to address their latest external quantum efficiency(EQE),highest lumi-nance,and stability *** hope that these performance tables and future updated versions will show the frontiers of PeLEDs,assist researchers in capturing the overview of this field,identify the remaining challenges,and predict the promising research directions.

关键词： metal halide perovskite light-emiting diode(LED) performance table

来源：评论

学校读者我要写书评

暂无评论

Giant 2D Skyrmion Topological Hall Effect with Ultrawide Temperature Window and Low-Current Manipulation in 2D Room-Temperature Ferromagnetic Crystals

arXiv

引用

arXiv 2023年

作者： Zhang, Gaojie Luo, Qingyuan Wen, Xiaokun Wu, Hao Yang, Li Jin, Wen Li, Luji Zhang, Jia Zhang, Wenfeng Shu, Haibo Chang, Haixin State Key Laboratory of Material Processing and Die & Mold Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Wuhan National High Magnetic Field Center Institute for Quantum Science and Engineering Huazhong University of Science and Technology Wuhan430074 China College of Optical and Electronic Technology China Jiliang University Hangzhou310018 China School of Physics Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China Shenzhen R&D Center of Huazhong University of Science and Technology Shenzhen518000 China

The discovery and manipulation of topological Hall effect (THE), an abnormal magnetoelectric response mostly related to the Dzyaloshinskii-Moriya interaction (DMI), are promising for next-generation spintronic devices based on topological spin textures such as magnetic skyrmions. However, most skyrmions and THE are stabilized in a narrow temperature window either below or over room temperature with high critical current manipulation. It is still elusive and challenging to achieve large THE with both wide temperature window till room temperature and low critical current manipulation. Here, by using controllable, naturally-oxidized, sub-20 and sub-10 nm 2D van der Waals room-temperature ferromagnetic Fe3GaTe2-x crystals, robust 2D THE with ultrawide temperature window ranging in three orders of magnitude from 2 to 300 K is reported, combining with giant THE of ~5.4 μΩ·cm at 10 K and ~0.15 μΩ·cm at 300 K which is 1-3 orders of magnitude larger than that of all known room-temperature 2D skyrmion systems. Moreover, room-temperature current-controlled THE is also realized with a low critical current density of ~6.2×105 A·cm-2. First-principles calculations unveil natural oxidation-induced highly-enhanced 2D interfacial DMI reasonable for robust giant THE. This work paves the way to room-temperature, electrically-controlled 2D THE-based practical spintronic devices. © 2023, CC BY-NC-ND.

关键词： Room temperature

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：