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Revolutionizing plasmonic platform via magnetic field-assisted confined ultrafast laser deposition of high-density,uniform,and ultrafine nanoparticle arrays

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International Journal of Extreme Manufacturing 2024年第3期6卷 428-438页

作者： Jin Xu Lingfeng Wang Peilin Yang Haoqing Jiang Huai Zheng Licong An Xingtao Liu Gary J Cheng School of Industrial Engineering Purdue UniversityWest LafayetteIN 47906United States of America Institute of Technological Sciences Wuhan UniversityWuhanHubei 430072People’s Republic of China

The remarkable capabilities of 2D plasmonic surfaces in controlling optical waves havegarnered significant ***,the challenge of large-scale manufacturing of uniform,well-aligned,and tunable plasmonic surfaces has hindered their *** address this,we present a groundbreaking tunable plasmonic platform design achieved throughmagnetic field(MF)assisted ultrafast laser direct deposition in *** precise control of metal nanoparticles(NPs),with cobalt(Co)serving as the model material,employing an MF,and fine-tuning ultrafast laser parameters,we have effectively converted coarse and non-uniform NPs into densely packed,uniform,and ultrafine NPs(~3 nm).This revolutionary advancement results in the creation of customizable plasmonic‘hot spots,’which play a pivotal role insurface-enhanced Raman spectroscopy(SERS)*** profound impact of this designable plasmonic platform lies in its close association with plasmonic resonance and *** the plasmonic nanostructures resonate with incident light,they generate intense local electromagnetic fields,thus vastly increasing the Raman scattering *** enhancement leads to an outstanding 2–18 fold boost in SERS performance and unparalleled sensing sensitivity down to 10^(-10)***,the plasmonic platform also demonstratesrobustness,retaining its sensing capability even after undergoing 50 cycles of rinsing andre-loading of ***,this work adheres to green manufacturing standards,making it an efficient and environmentally friendly method for customizing plasmonic‘hot spots’inSERS *** study not only achieves the formation of high-density,uniform,and ultrafine NP arrays on a tunable plasmonic platform but also showcases the profound relation betweenplasmonic resonance and energy *** outstanding results observed in SERS sensors further emphasize the immense potential of this technology for energy-relatedapplications,including photocatalysis,ph

关键词： magnetic field manipulation laser deposition metasurface SERS

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Variation of crystal orientation during epitaxial growth of dendrites by laser deposition

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Journal of Materials Science & Technology 2018年第4期34卷 732-735页

作者： Guowei Wang Jingjing Liang Yizhou Zhou Libin Zhao Tao Jin Xiaofeng Sun Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Xi'an Aero-engine Control Technology Co.Ltd Xi'an 710077China

A nickel-based superalloy was deposited onto a single crystal substrate based on epitaxial laser metal forming （E-LMF）. The microstructure development in two depositions has been researched. For the first time, the crystal orientation of dendrites varying beyond 20° was found when the dendrites deflected in deposition. In addition, a new grain boundary was found between different orientation dendrites in a grain, and the detected grain boundary angle was 23°. The result shows that flowing field in laser pool is responsible for this phenomenon.

关键词： Crystal orientation Epitaxial growth laser deposition Single crystal Dendrite growth

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Additive manufacturing of a high-strength ZrC-SiC and TC4 gradient structure based on a combination of laser deposition technique and brazing

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Journal of Materiomics 2021年第4期7卷 766-779页

作者： Qian Wang Junmiao Shi Lixia Zhang Jiangtao Xiong Jinglong Li Ninshu Ma Jicai Feng Joining and Welding Research Institute Osaka UniversityIbarakiOsaka567-0047Japan State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an710072China Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical UniversityXi’an710072China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China

A ZrC-SiC and TC4 gradient structure(ZTGS)was additively manufactured through the laser deposition technique and brazing *** research results indicated that SiC-reinforced TC4-based gradient layers could be obtained on the TC4 surface by laser ***-SiC and TC4 coated with gradient layers were brazed using an AgCuTi filler to fabricate the *** effects of the gradient structure and brazing parameters on the ZTGS strength were *** an increase in Layer II and Layer III thickness,the ZTGS shear strength *** brazing temperature and holding time affected the ZTGS shear strength by controlling the formation and distribution of the Cu4Ti phase in the brazing *** strengthening mechanism of the ZTGS was revealed by analyzing the residual stress distribution in the *** residual stress was formed in ZrC-SiC adjacent to the TC4 substrate or the deposited gradient layer,which was found to negatively affect the properties of the *** increase in gradient layer thickness reduced the maximum residual stress in ZrC-SiC,and the effect of Layer III on the residual stress was more significant than that of Layer *** calculated residual stress evolution matched the ZTGS property values well,revealing the strengthening mechanism.

关键词： Gradient structure laser deposition Brazing Residual stress

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Mechanical properties and microstructure of 3D-printed high Co–Ni secondary hardening steel fabricated by laser melting deposition

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International Journal of Minerals,Metallurgy and Materials 2017年第9期24卷 1027-1033页

作者： Hui-ping Duan Xiao Liu Xian-zhe Ran Jia Li Dong Liu School of Materials Science and Engineering Beihang UniversityBeijing 100191China National Engineering Laboratory of Additive Manufacturing for Large Metallic Components Beijing 100191China Engineering Research Center of Ministry of Education on laser Direct Manufacturing for Large Metallic Component Beijing 100191China

The mechanical properties and microstructure of the 3D-printed high Co–Ni secondary hardening steel fabricated by the laser melting deposition technique was investigated using a material testing machine and electron microscopy. A microstructure investigation revealed that the samples consist of martensite laths, fine dispersed precipitates, and reverted austenite films at the martensite lath boundaries. The precipitates are enriched with Co and Mo. Because the sample tempered at 486°C has smaller precipitates and a higher number of precipitates per unit area, it exhibits better mechanical properties than the sample tempered at 498°C. Although the 3D-printed samples have the same phase constituents as Aer Met 100 steel, the mechanical properties are slightly worse than those of the commercial wrought Aer Met 100 steel because of the presence of voids.

关键词： laser deposition high strength steel mechanical properties microstructure

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in situ laser deposition OF HIGH Tc SUPERCONDUCTING THIN FILMS

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Progress in Natural Science:Materials International 1991年第6期 515-519页

作者：安承武范永昌陆冬生李再光 PRC State Key Laboratory of laser Technology Huazhong University of Science and Technology Wuhan 430074

Superconducting Y-Ba-Cu oxides thin films on zirconia substrates with zero resistance temperature of92 K,critical current density of about the order of 10~5 A/cm~2 at 77 K and crystal structure of preferen-tial c-axis orientation perpendicular to its surface have been successfully prepared in situ using pulsedlaser(308 nm,28 ns )ablation of a superconducting Y-Ba-Cu oxides disk without plasma assistance at asubstrate temperature below 600℃.The influences of preparation conditions,such as laser parameters,oxygen ambient,substrate temperature,and deposition time,on the superconductivity of the in situgrown thin films are discussed.

关键词： laser deposition superconducting thin films in situ growth

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Nano-Traceability Study of a Cr Standard Grating Fabricated by laser-Focused Atomic deposition

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Chinese Physics Letters 2014年第7期31卷 46-49页

作者：雷李华李源范国芳翁浚婧邓晓蔡潇雨李同保 School of Physics Science and Engineering Tongji University Shanghai 200092 Shanghai Institute of Measurement and Testing Technology National Center of Measurement and Testing for East China National Center of Testing Technology Shanghai 201203 Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190

A dimensional artifact is developed, which is a chromium （Cr） deposition grating fabricated by a laser-focused atomic deposition technique. The mean pitch of the grating is measured by using a metrological atomic force microscope with a large range, where a series of reference signs have been performed to locate the deposition area. Cosine error of the measurement result is analyzed and eliminated by the iterative angle calibration. The measurement result shows that the mean pitch of the grating is 212.66 ±0.02nm, which is very close to half of the standing laser wavelength （λ = 425.55 nm）. This means that the grating has traceability with high accuracy and can substitute the laser interference technology for instrument calibration. Moreover, using the Cr deposition grating as a nano standard can shorten the traceability chain and improve the practical application.

关键词： CHROMIUM METAL fabrication NANOTECHNOLOGY ATOMIC layer deposition laser deposition

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Underwater laser directed energy deposition of NV E690 steel

Advanced Powder Materials

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Advanced Powder Materials 2023年第3期2卷 69-76页

作者： Mingzhi Chen Kun Yang Zhandong Wang Shibin Wang Erke Wu Zhonghua Ni Jinzhong Lu Guifang Sun School of Mechanical Engineering and Jiangsu Key Lab Design&Mfg Micronano Biomed Ins Southeast UniversityNanjing211189China College of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing210037China School of Mechanical Engineering Jiangsu UniversityZhenjiang212013China

Powder-based laser direct metal deposition(DMD),one of the directed energy deposition,was applied in air andunderwater to repair pre-machined NV E690 steel *** investigations on the effects of underwaterenvironment and ambient pressures(0.01–0.35 MPa)on the microstructure evolution,phase transformation,andmechanical properties were *** water quenching effect reﬁned the grain size and increased thedislocation density and lath martensite *** theoretical models of the underwater pressurized nitridingprocess and the precipitation kinetics of(Ti,V)N particles were ***,the microstructure evolution and the mechanical properties of other underwater DMD repaired samples did not show obvious relationwith the underwater ambient *** investigation not only provides a candidate for the underwaterrestoration technique but also bridges marine engineering and emerging DMD technology.

关键词： laser deposition Microstructure Mechanical property Nitriding Precipitation

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Microstructure and properties of laser direct deposited CuNi17Al3Fe1.5Cr alloy

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International Journal of Minerals,Metallurgy and Materials 2011年第3期18卷 325-329页

作者： Yong-zhong Zhang Can Huang Rui Vilar Center for Composites General Research Institute for Non-ferrous Metals Beijing 100088 China Department of Materials Engineering and Institute of Materials and Surfaces Science and Engineering Instituto Superior Técnico 1049-001 Lisbon Portugal

Thin walls of a copper-base alloy with the nominal composition CuNi17Al3Fe1.5Cr were successfully prepared by laser direct deposition additive manufacturing. The microstructure, as revealed by optical and scanning electron microscopy, indicated that the deposited material was fully dense and with a dendritic microstructure. The dendrites are parallel to the build-up direction, which is also the heat con-duction direction during deposition. X-ray diffraction analysis results show that the deposited material is composed of a single phase and a copper-based solid solution. Some precipitate particles of metal silicides were observed in the interdendritic region by scanning electron mi-croscopy. The ultimate tensile strength along the laser scanning direction reaches 735 MPa. The hardness is about Hv0.1 300.

关键词： copper alloys laser deposition microstructure mechanical properties

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Accelerated exploration of TRIP metallic glass composite by laser additive manufacturing

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Journal of Materials Science & Technology 2021年第19期78卷 68-73页

作者： Zejiang Yu Wei Zheng Zhiqiang Li Yunzhuo Lu Xinbing Yun Zuoxiang Qin Xing Lu School of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116028China Xi'an Space Engine Company Limited Xi'an710100China Engineering Research Center of Continuous Extrusion Ministry of EducationDalian Jiaotong UniversityDalian116028China

Introducing transformation-induced plasticity(TRIP)effect into bulk metallic glass composites(BMGCs)is an effective route to improve their ductility and strain-hardening *** the morphology and structure of the crystalline austenite phases responsible for the TRIP phenomenon are strongly dependent on the alloy composition and cooling rate during freezing,distinguishing the optimal cases from a vast variety of candidates is the primary task of exploring TRIP ***,without a suitable theoretical guidance,the exploration of BMGCs is usually performed via the traditional trial-and-error route,making the BMGC development extremely time consuming and labor ***,we present a novel high-throughput strategy to accelerate the exploration process of TRIP *** efficiency of this strategy was demonstrated on a well-studied Cu-Zr-Al alloy system.A screening library,comprised by121 cylindrical samples with different conditions,was rapidly prepared by laser additive manufacturing(LAM).The phases of the library were efficiently identified by micro-area X-ray diffraction(M-XRD)to screen the optimal compositions and cooling rates that precipitate only B2-Cu Zr *** distribution uniformity of the B2-Cu Zr phase was further evaluated based on digital image processing technology to screen the candidates of better *** high-throughput results are in good agreement with the previous casting investigations of discrete samples,confirming the validity of the present high-throughput strategy.

关键词： Bulk amorphous materials Composites High-throughput laser deposition Metastable phases

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Self-Organized Micro-Columns and Nano-Spheres Generated by Pulsed laser Ablation of Ti/A1 Alloy in Water

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Chinese Physics Letters 2014年第1期31卷 115-118页

作者：崔清强刘向东陈明赵明文王春省李爽 School of Physics and State Key Laboratory of Crystal Materials Shandong University Jinan 250100 School of Chemistry Shandong University Jinan 250100 School of Computer Shandong Xiehe University Jinan 250100

Dense arrays of micro-columns are formed on the surface of Ti-AI alloy by cumulative nanosecond pulsed laser ablation in water. The fabric-like structure characterized by Ti-A1 nano-spheres absorbed on micro-duster in liquid is most likely responsible for the occurrence of laser micro-etching and localized melting, resulting in continuous deepening of micro-holes and the formation of micro-columns. laser induced plasma spectroscopy is carried out to reveal the effect of micro-columns on subsequent pulse laser ablation. The intensity of spectral lines from Ti ions by additional laser ablation of the modified spot is higher than that created over a smooth surface. These results suggest that the micro-columns lead to an enhanced absorption of the following laser energy. The proposed results and relevant discussions are of importance for the development of light-trapping coatings on a metal surface.

关键词： PULSED laser deposition laser deposition PLASMA spectroscopy OPTICAL spectroscopy PLASMA physics SPECTRUM analysis

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