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Preparation of Core-Shell Nanoparticles and Their Application in Precision Machining

稀有金属材料与工程 2024年第12期53卷 3348-3357页

作者： Wang Youliang Kang Yating Zhang Wenjuan Jiang Zhe Yin Xincheng School of Mechanical and Electrical Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China

Preparation method of magnetic nanoparticles with core-shell structure was introduced,especially focusing on the preparation principle of sol-gel method,microemulsion method,and self-assembly *** application of core-shell nanoparticles in precision machining was *** Fe_(3)O_(4)@SiO_(2)composite particles were prepared by sol-gel method and were applied to the magnetorheological polishing of titanium alloy *** show that core-shell nanoparticles with higher surface quality can be obtained after processing,compared with those after conventional *** polishing for 20 min,the surface roughness of the workpiece reaches 23 nm and the scratches are effectively ***,the preparation and application of coreshell nanoparticles are summarized and prospected to provide a reference for further research on core-shell nanoparticles.

关键词： core-shell structure magnetic composite nanoparticles preparation precision machining applications

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Fabrication and compressive behavior of open-cell aluminum foams via infiltration casting using spherical CaCl_(2) space-holders

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China Foundry 2022年第2期19卷 89-98页

作者： Tan Wan Gang-qiang Liang Zhao-ming Wang Can-xu Zhou Yuan Liu School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Tsinghua UniversityBeijing 100084China

The infiltration casting fabrication process based on spherical CaCl_(2) space-holders and the compressive behavior including the mechanical performance and energy absorption capacity of open-cell aluminum foams were ***-cell aluminum foams with different porosities in the range of 63.1%to 87.3%can be fabricated by adjusting compression ratios of CaCl_(2) preforms prepared by precision *** compression tests show that a strain-hardening phenomenon always occurs especially for open-cell aluminum foam with low porosity,resulting in the inclining stress-strain curve in the plateau *** energy absorption capacity of open-cell aluminum foam decreases with increasing porosity when compared at the same ***,when compared at a given stress,each foam can absorb the maximal energy among the five foams in a special stress ***,open-cell aluminum foam possesses the maximum energy absorption efficiency at its optimum operating *** this stress condition,the foam can absorb the highest energy compared with other foams at the same stress *** optimum operating stress and the corresponding maximal energy absorption decrease with increasing the *** optimum operating stress for energy absorption can also be determined similarly when taking into consideration of the lightweight extent of foams.

关键词： open-cell aluminum foam CaCl_(2)space-holder infiltration casting energy absorption

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Mechanism of yttrium in deep desulfurization of NiCoCrAIY alloy during vacuum induction melting process

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Rare Metals 2022年第1期41卷 218-225页

作者： Jin-Peng Li Hua-Rui Zhang Ming Gao Qing-Ling Li Jie Zhang Bo Yang Hu Zhang School of Materials Science and Engineering Beihang UniversityBeijing 100191China Beijing Key Laboratory for Advanced Functional Material and Thin Film Technology Beihang UniversityBeijing 100191China

In this study,yttrium as desulfurizer on the purification of Ni-20Co-20Cr-10Al-Y alloy during vac-uum induction melting(VIM)process using Y_(2)O_(3)cru-cibles was investigated *** is found that Y plays an important role on the desulfurizing of the NiCo-CrAIY *** any addition of Y,merely the employment of Y_(2)O_(3)crucibles could effectively reduce S content of the alloy melts from 28×10^(-6)to 6×10^(-6)-7×10^(-6).With addition of 0.8 wt%Y in the alloy,the concentration of S could further reduce 2×10^(7)3×10^(-6).The primary interactive mechanism between Y and molten alloy was concluded to be the synthesis reac-tion of NisY phase,Y2S3 phases and YAIO_(3)*** the desulfurize slags,Y2S3 phases and Y_(2)O_(3)phase are *** secondary contamination is present in the alloy melts after addition of Y.

关键词： Yttrium Desulfurization Vacuum induction melting Y_(2)O_(3)crucibles NiCoCrAIY alloy

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Growth of magnetic metals on carbon microspheres with synergetic dissipation abilities to broaden microwave absorption

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Journal of materials Science & technology 2022年第12期107卷 100-110页

作者： Biao Zhao Yang Li Qingwen Zeng Bingbing Fan Lei Wang Rui Zhang Renchao Che Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200438China Department of Materials Science Fudan UniversityShanghai 200438China Henan Key Laboratory of Aeronautical Materials and Application Technology School of Material Science and EngineeringZhengzhou University of AeronauticsZhengzhouHenan 450046China School of Material Science and Engineering Zhengzhou UniversityZhengzhouHenan 450001China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

Microwave absorption(MA) materials have been captured extensive attentions due to the serious electromagnetic(EM) pollution. Numerous interests focus on the MA performances of core-shell structural composites with magnetic constituents as cores and dielectric constituents as shells, which inevitably suppressed the magnetic coupling causing the decrease of magnetic loss to some extent. Herein, the coreshell structural carbon(C) microsphere/magnetic metal composites were fabricated through the combination of an electrostatic assembly approach and subsequent in-situ reduction reaction. The complex permittivity and permeability of core-shell C@magnetic metal composite system can be effective adjusted by the constituent and microstructure of shells. Thanks to the distinct magnetic coupling from the subtle designed structures and the promotion of the magnetic-dielectric synergy, the C@magnetic metal composite exhibited enhanced MA properties. The optimal reflection loss(RL) of C@Ni composite was-54.1 dB with a thickness of 3.4 mm, meanwhile the effective absorbing band could reach over 5.5 GHz at only a1.8 mm thickness. Broad absorption bandwidth with RL below-10 d B could achieve 6.0 GHz and 6.7 GHz for C@Co and C@Ni Co composites with a thin 2.1 mm thickness, respectively. Our exciting findings might lead a guide on the novel structure design for the functional core-shell structural composites used for microwave absorption.

关键词： Microwave absorption Core-shell structure C@magnetic metal composite Interfacial polarization Magnetic coupling

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Anomalous enhancing effects of electric pulse treatment on strength and ductility of TC17 linear friction welding joints

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Journal of materials Science & technology 2024年第36期203卷 155-166页

作者： Xin Zhang Junjie Zhang Yunkui Yao Qingsong Qiao Lixing Zhao Leichang Liu Feng Jin Mei Zhan Hongwei Li Key Laboratory of High-Performance Manufacturing for Aero Engine Ministry of Industry and Information TechnologyNorthwestern Polytechnical UniversityXi’an 710072China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Mechanical properties of TC17 titanium alloy undergo a significant reduction after linear friction welding(LFW),of which the strength and ductility are hard to be improved simultaneously by traditional aging heat treatment(AHT),seriously limiting the application of LFW in the manufacturing of TC17 titanium alloy *** this end,the present work proposes to use electric pulse treatment(EPT)to enhance the strength and ductility of TC17 LFW joints simultaneously by improving its *** results show that,in comparison to the uneven distribution ofαphases in the welding zone(WZ),heat-affected zone(HAZ),and base metal(BM)zone after AHT,EPT can selectively homogenize theαphase distribution of WZ and HAZ without impacting the *** selective effect of EPT is reflected as the synergistic influence of the local Joule heating effect and the electron wind effect,which promotes the diffusion ofβphase stabilizing element Mo and leads to a competitive precipitation ofβphase andαphase in theαphase transition temperature *** ratio ofαphase toβphase in the WZ and HAZ finally approaches an equilibrium point which is similar to that of BM,leading to a uniform distribution ofαphase and realizing the synergy of strength-ductility of LFW joint:the maximum strength increase observed is 12.9%,accompanied by a corresponding elongation increase of 122%(by AHT&EPT),and the maximum plasticity improvement is 185%,accompanied by a corresponding strength increase of 4.3%(by EPT for 1 h).This study provides essential insights for improving the strength and ductility of LFW TC17 titanium alloy blisks and enhancing the applications of LFW in aeroengine components.

关键词： Linear friction welding TC17 titanium alloy Electric pulse treatment Phase transformation Local joule heating effect

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Effect of removing Al and Ti elements on peak flow stress of nickel-based heat-resistant alloy 617

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Journal of Iron and Steel Research International 2023年第2期30卷 384-391页

作者： Chen Dong Zheng-zong Chen Zheng-dong Liu Han-sheng Bao Zhen Liu Zheng-jun Wang Faculty of Mechanical and Material Engineering Huaiyin Institute of TechnologyHuaian223003JiangsuChina Jiangsu Key Laboratory of Advanced Manufacturing Technology Huaiyin Institute of TechnologyHuaian223003JiangsuChina Institute for Special Steels Central Iron and Steel Research Institute Co.Ltd.Beijing100081China

The hot deformation behavior and the microstructure characteristics of alloy 617 and alloy C-HRA-2 were compared and *** removal of Al and Ti elements has a significant change in the hot deformation of the alloy,and there are two opposite effects on the flow stress before and after *** results show that the removal of Al and Ti elements increases the flow stress of the alloy under high temperature or low strain rate deformation *** is mainly due to the increase in the stacking fault energy of the alloy so that the alloy contains a higher twin boundary fraction after dynamic recrystallization(DRX).However,before DRX occurs,that is,at low temperature and high strain rate,the flow stress of this alloy is relatively *** is due to the reduction in Peierls-Nabarro stress,making the alloy more prone to dislocation slip.

关键词： Peak flow stress Nickel-based heat-resistant alloy Slip band Stacking fault energy

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Femtosecond laser writing of low-loss three-dimensional waveguide coupler in LiNbO_(3) crystal

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Chinese Optics Letters 2023年第11期21卷 118-122页

作者：吕金蔓李戈马钰洁陈峰 Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Advanced Material Diagnostic Technologyand College of Engineering PhysicsShenzhen Technology UniversityShenzhen 518118China School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China

With different interactions between material and femtosecond lasers,two-dimensional(2D)and three-dimensional(3D)waveguide couplers,whose separation distances are fabricated in z-cut lithium niobate crystal by femtosecond laser writing,are *** and numerically,it is shown from results that the guidance is only propagating along TM polarization due to the Type I modification and holds equal splitting ratios,which are the same as power splitters at632.8 *** propagation losses of 2D and 3D waveguide couplers exhibit better transmission properties than those of the previously reported Type I Y-junction waveguide splitters.

关键词： femtosecond laser writing beam splitters lithium niobate

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Discovery of new MAX-phase-like layered ternary carbide V_(8)P_(6)C:Crystal structure,thermal expansion,and elastic properties

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Journal of materials Science & technology 2024年第7期174卷 55-62页

作者： H.X.Chen L.Sheng Z.L.Zhang X.C.Wen D.L.Yang X.Y.Ye P.Q.Dai School of Materials Science and Engineering Fujian University of TechnologyFuzhou 350118China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of ScienceBeijing 100049China Fujian Provincial Key Laboratory of Advanced Materials Processing and Application Fuzhou 350118China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Due to the laminated structure,MAX phases and MAX-phase-like compounds possess outstanding dam-age tolerance capability with good thermal/electrical conductivity and other charming functional prop-erties,showing a bright future for structural-functional ***,a new MAX-phase-like ternary car-bide V_(8)P_(6)C with layered characteristics was *** to the alternate stacking of hexagonal-arranged M/A/X atom layers in MAX phases,V_(8)P_(6)C has a layered structure formed by a repeated stacking of the slabs consisting of V_(6)C-octahedrons and VP 6-distorted-octahedrons in three-atomic layers *** thermal expansion anisotropy was revealed,with the thermal expansion coefficients(TECs)along a-axis,c-axis,and the average value,equal toα_(a)=8.55(5)μK^(−1),α_(c)=10.23(5)μK^(−1),andα_(L)=9.14(5)μK^(−1),*** dilation along the c-axis was mainly dominated by out-plane V-P bonds be-tween layered *** to the pressure-dependent lattice parameters,the polycrystalline bulk modulus(B_(0)=185(9)GPa)and high compressibility anisotropy factor(B_(a)/B_(c)=1.64)was ***-while,the second-order elastic constants were calculated,and the elastic moduli,E=303 GPa,B=198 GPa,G=122 GPa,andν=0.246,were *** the weak connection between layer slabs by out-plane V1-P bond was revealed by the bond stiffness model,with a bond stiffness close to the M-A bond in MAX ***,good damage tolerance capability was predicted according to Paugh’s ratio(G/B=0.616)and Cauchy pressure(P_(a)=0 GPa,P_(c)=-7.5 GPa),even better than those of typical MAX *** discovery of V_(8)P_(6)C provides a new member of MAX-phase-like damage-tolerant ceramic with relatively low density,moderate thermal expansion,and anisotropic compressibility,and the unique lay-ered structure is inspiring for exploring new layered ternary ceramics.

关键词： New ternary carbide MAX phase Thermal expansion Elastic constants Anisotropy

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Effects of Silica-Modified Aluminum on the Microstructure and Properties of Diamond/Al-Si Composites 75

Effects of Silica-Modified Aluminum on the Microstructure an...

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75th World Foundry Congress, WFC 2024

作者： Fu, Jiaping Zhou, Canxu Liu, Yuan School of Materials Science and Engineering Tsinghua University Beijing100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Beijing100084 China

To improve the wettability of the Diamond/Aluminum (Dia/Al) composites interface and prevent the excessive formation of Al4C3, this study used silicon-modified aluminum as the matrix. The composites with different silicon content in the matrix were fabricated by the vacuum-assisted pressure infiltration method, and the effects of silicon content on the microstructure and properties of the composites was systematically studied. The results showed that the Dia/Al-Si composites had a uniform and dense microstructure with good interfacial bonding. With the increase in silicon content, both the thermal conductivity and bending strength of the composites first increased and then decreased, while the coefficient of thermal expansion decreased monotonically. When the silicon content was 12 wt.%, the composites prepared with 180 μm diamond particles exhibited the highest thermal conductivity and bending strength, reaching 654 W · m-1·K-1 and 296 MPa, respectively, and the coefficient of thermal expansion was as low as 6.13 × 10-6 ·K-1. This study indicates that the silicon-modified aluminum matrix can effectively suppress the excessive formation of Al4C3, and the coexisting of appropriate amount of Al4C3 or SiC at the interface enhances interfacial bonding, thereby improving the performance of the composites. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Bending strength

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Biomimetic lubricant-grafted surfaces on laser-textured microwell arrays with multifunctionality

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Friction 2024年第12期12卷 2707-2725页

作者： Xiaorui SONG Zhiqiang HOU Zhehao GAN Yuyao HU Hongyu ZHENG Yongling WU Mingming LIU Centre for Advanced Laser Manufacturing(CALM) School of Mechanical EngineeringShandong University of TechnologyZibo 255000China School of Environmental and Material Engineering Yantai UniversityYantai 264405China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Recently,various slippery liquid-infused porous surfaces(SLIPS)have been fabricated for the protection of various ***,these SLIPSs are limited by their underlying storage structure and superficial lubricant layer,showing poor ***,inspired by the high-strength structure of Shell nacre’s“brick-mud”layer,we fabricated an all-inorganic composite coating by using wet chemically etched MXene as a brick and an aluminum phosphate binder(AP)as ***,a series of microwell-array structures were designed and prepared on the coating via nanosecond ultrafast laser writing ablation ***,the textured surface was modified by a silane coupling ***-terminated polydimethylsiloxane(PDMS)was tightly grafted onto the porous surface through a thiol-ene click reaction to obtain lubricant grafted texture surface(LGTS).The prepared LGTS showed good lubrication properties for multiple phases,including various liquids,ice crystals,and *** exhibits excellent chemical stability and mechanical durability under deionized water impact,centrifugal test,strong acid solutions,anti/de-icing cycles,and high-intensity ***,the proposed strategy for constructing robust LGTS will greatly promote theoretical research on super wetting interfacial materials and their applications in the fields of antifouling,anti/de-icing,and lubricating protection.

关键词： laser texture lubricant covalent grafting omniphobicity anti-icing

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