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Control of electromechanical performance in 3d printing latticestructured BaTiO_(3) piezoelectric ceramics

Journal of Advanced Ceramics 2024年第7期13卷 987-1001页

作者： Zhujun Jiang Yinghong Sun Jimin Chen Yong Zeng Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China Beijing Engineering Research Center of 3D Printing for Digital Medical Health Beijing University of TechnologyBeijing 100124China

Barium titanate(BaTiO_(3))piezoelectric ceramics with triply periodic minimal surface(TPMS)structures have been frequently used in filters,engines,artificial bones,and other fields due to their high specific surface area,high thermal stability,and good heat ***,only a limited number of studies have analyzed the effect of various parameters,such as different wall thicknesses and porosities of TPMS structures,on ceramic electromechanical *** this study,we first employed vat photopolymerization(VPP)three-dimensional(3d)printing technology to fabricate high-performance BaTiO_(3) *** investigated the slurry composition design and forming process and designed a stepwise sintering postprocessing technique to achieve a density of 96.3%and a compressive strength of 250±25 MPa,with the piezoelectric coefficient(d_(33))reaching 263 pC/***,we explored the influence of three TPMS structures,namely,diamond,gyroid,and Schwarz P,on the piezoelectric and mechanical properties of BaTiO_(3) ceramics,with the gyroid structure identified as exhibiting optimal ***,we examined the piezoelectric and mechanical properties of BaTiO_(3) ceramics with the gyroid structure of varying wall thicknesses and porosities,thus enabling the modulation of ceramic electromechanical performance.

关键词： three-dimensional(3d)printing piezoelectric ceramics porous structure mechanical properties electrical properties

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Correction to: Investigation of Ti2AlNb-Added TiAl Composite Prepared by direct Laser deposition (Journal of Materials engineering and Performance, (2024), 10.1007/s11665-024-10078-5)

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Journal of Materials engineering and Performance 2024年 1-2页

作者： Zhang, Guohui Qin, Renyao Li, Neng Qu, Zhiqi Wang, Tianyuan Zhou, Biao 3D Printing Research and Engineering Technology Center Beijing Institute of Aeronautical Materials Beijing100095 China

In the originally published version of the article, "decrease" was incorrectly used in place of "increase" in one sentence in the abstract. The sentence has been corrected as follows: Unmelted Ti2AlNb particles could be found in the lamellar colony band, which could increase the dislocation density further to increase the strength. In addition, the inaccurate label "α2-TiAl" has been corrected to "α2-Ti3Al" in Fig. 9a. TEM images of the dLd sample, a γ/α2 lamellar, b γ equiaxed grain in the lamellar colony, c HRTEM image of γ/α2 lamellar interface and d lamellar with dislocation © ASM International 2024.

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Effect of post heat treatment on microstructure, mechanical property and corrosion behavior of AlSi10Mg alloy fabricated by selective laser melting

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Progress in Natural Science:Materials International 2024年第1期34卷 89-101页

作者： Yang Zheng Zihao Zhao Ruize Xiong Guochun Ren Minghui Yao Wei Liu Libin Zang School of Aeronautics and Astronautics Tiangong University School of Mechanical Engineering Tiangong University 3D Printing Research&Engineering Technology Center AECC Beijing Institute of Aeronautical Materials Tianjin Institute of Aerospace Mechanical and Electrical Equipment

The microstructure, mechanical property and corrosion behavior of the AlSi10Mg alloy fabricated by selective laser melting(SLMed-AlSi10Mg) after different post heat treatment(PHT) of direct aging(dA), solid solution(T4)and solid solution + aging(T6) were investigated. The microstructural characterization revealed that the porosity of the SLMed-AlSi10Mg was increased from 0.41 ± 0.04 % to 3.09 ± 0.11 % with increasing temperature. The Asbuilt and dA-treated samples exhibited a microstructure of α-Al matrix surrounded with continuous Si networks,whereas the T4-treated and T6-treated samples presented a microstructure of α-Al matrix surrounded with discrete Si particles. The microhardness, strength and work hardening rate of the SLMed-AlSi10Mg increased in the order of T4-treated sample < T6-treated sample < As-built sample < dA-treated sample(a reverse order was found for the elongation), which was due to the precipitation of nanoscale Si particles after dA treatment and the softening of α-Al matrix after T4 and T6 treatments. The corrosion resistance of the SLMed-AlSi10Mg was obviously deteriorated after T4 and T6 treatments compared with dA treatment, which was caused by the changes in Si morphology, residual stress and porosity.

关键词： Selective laser melting AlSi10Mg alloy Post heat treatment Microstructure Mechanical property Corrosion behavior

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Interfacial Microstructures and Mechanical Properties of TiC Reinforced GH 3230 Superalloy Manufactured by Laser Metal deposition

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Chinese Journal of Mechanical engineering 2024年第6期37卷 43-58页

作者： Yan Wang Neng Li Wei Liu Chonglin Jia Yu Wu Chao Gao Huaping Xiong Division of Welding and Plastic Forming 3D Printing Research and Engineering Technology CenterBeijing Institute of Aeronautical MaterialsBeijing 100095China Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical MaterialsBeijing 100095China

GH 3230 superalloy is a solution strengthening nickel-based superalloy and it is commonly used for fabricating hot components with the service temperature of above 900℃.In order to further improve high-temperature performance,nickel-based alloy matrix composites(NMCs)were ***,it is known that laser additive manufacturing is an optional method for fabricating nickel-based ***,the research on ceramic-reinforced GH 3230 fabricated by laser metal deposition(LMd)are highly *** aim of this study is to develop TiC ceramic particle reinforced GH 3230 composites using laser metal deposition(LMd)method and study the effect of TiC content on their microstructure and tensile *** results showed that TiC particles not only changed the intensity and position of the X-ray diffraction peaks of the alloy matrix but also had a significant effect on the refinement of the cellular ***,it was found that an interfacial layer with sub-micrometer thickness was formed between the TiC ceramic particle and the superalloy matrix,which was identified to be(W,Ti)C_(1-x)phase by the *** terms of the as-built composites,the ultimate tensile strength(UTS)and yield strength(YS)gradually increased,but elongation(EL)decreased with the increase of TiC *** the as-LMded 10 vol.%TiC/GH3230 composites,UTS and EL reached 1077.0 MPa and 12.4%,*** enhancement of the tensile strength for composites was attributed to the combined effect of grain refinement strengthening,Orowan strengthening,dislocation strengthening and loading-bearing strengthening.

关键词： Laser metal deposition GH 3230 superalloy TiC particles Mechanical properties Interfacial layer

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Effect of Post-heat Treatment on Microstructure and Mechanical Properties of Laser Cladded High Co-Ni Secondary Hardening Steel Coating 11

Effect of Post-heat Treatment on Microstructure and Mechanic...

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11th Annual International Conference on Material Science and Environmental engineering, MSEE 2023

作者： Qin, Renyao Chen, Bingqing Zhang, Guohui Liu, Wei Li, Neng Huang, Shuai Gao, Chao 3D Printing Research & Engineering Technology Center Beijing Institute of Aeronautical Materials Huanshancun Haidian District Beijing100095 China

The effect of post-heat treatment on the microstructure and microhardness of laser cladded high Co-Ni secondary hardening steel coating was investigated. The microstructures were analyzed using a SEM equipped with an EdS, and the microhardness was measured with a Vickers indenter. decomposition of the retained austenite in the coating occurred during the post-heat treatment. As the temperature increased from 200 oC to 600 oC, the quantity of the retained austenite at the boundaries decreased significantly, while that of the needle-shaped M3C cementite and M2C carbides increased. The M2C carbides evidently coarsened when the temperature was higher than500 oC. The microhardness of high Co-Ni steel coating increased as the temperature of post-heat treatment increased from 200 oC to 400 oC because the fine-scale M2C carbides were coherent with the matrix and increased distinctly in this temperature range. It decreased sharply when the temperature further increased from 500 oC to 600 oC due to both the incoherency of the coarsened M2C carbides and the recovery of dislocations in the carbon-supersaturated matrix. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Carbides

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Properties and printability evaluation of three-dimensional printing magnesium oxychloride cement by fully utilizing aeolian sand

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Frontiers of Structural and Civil engineering 2023年第11期17卷 1675-1689页

作者： Qinghua WANG Jinggang XU duo FENG Wei LI Yuanyuan ZHOU Qiao WANG School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China Hebei Investigation Design&Research Institute of Water Conservancy&Hydropower Tianjin 300240China Engineering Research Center on Construction 3D Printing of Hebei Tianjin 300401China

Three-dimensional concrete printing(3dCP)is increasingly being applied in harsh environments and isolated ***,the effective utilization of aeolian sand(AS)resources and by-products derived from arid zones for 3dCP is yet to be fully *** study developed a three-dimensional(3d)printing composite using AS and magnesium oxychloride cement(MOC)from local *** effects of the mole ratio of MgO/MgCl_(2)and sand/binder(S/B)ratio on the mechanical properties such as water resistance,drying shrinkage strain,rheology,and printability,were investigated *** results indicated that the optimal mole ratio of MgO/MgCl_(2),was 8,which yielded the desired mechanical performance and water ***,the S/B ratio can be increased to three within the desired printability to increase the AS utilization *** rheological recovery and buildability of the 3d-printed MOC with AS were *** findings provide a promising strategy for construction in remote deserts.

关键词： 3dCP AS magnesium oxychloride cement mechanical behavior drying shrinkage rheological property

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Process,Material,and Regulatory Considerations for 3d Printed Medical devices and Tissue Constructs

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engineering 2024年第5期36卷 146-166页

作者： Wei Long Ng Jia An Chee Kai Chua Singapore Centre for 3D Printing(SC3DP) School of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore 639798Singapore Centre for Healthcare Education Entrepreneurship and Research@SUTD(CHEERS)Singapore University of Technology and DesignSingapore 487372Singapore

Three-dimensional(3d)printing is a highly automated platform that facilitates material deposition in a layer-by-layer approach to fabricate pre-defined 3d complex structures on *** is a highly promising technique for the fabrication of personalized medical devices or even patient-specific tissue *** type of 3d printing technique has its unique advantages and limitations,and the selection of a suitable 3d printing technique is highly dependent on its intended *** this review paper,we present and highlight some of the critical processes(printing parameters,build orientation,build location,and support structures),material(batch-to-batch consistency,recycling,protein adsorption,biocompatibility,and degradation properties),and regulatory considerations(sterility and mechanical properties)for 3d printing of personalized medical *** goal of this review paper is to provide the readers with a good understanding of the various key considerations(process,material,and regulatory)in 3d printing,which are critical for the fabrication of improved patient-specific 3d printed medical devices and tissue constructs.

关键词： 3d printing Bioprinting Biofabrication Medical devices Tissue constructs

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Rapid directionally solidified microstructure characteristic and fracture behaviour of laser melting deposited Nb–Si–Ti alloy

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Progress in Natural Science:Materials International 2021年第1期31卷 113-120页

作者： Wei Liu Xinyu Ren Neng Li Chao Gao Huaping Xiong 3D Printing Research and Engineering Technology Center Beijing Institute of Aeronautical Materials

Aiming at achieving fine and directionally-solidified microstructure of Nb-Si based alloy,Nb,Si and Ti powder particles were utilized as the raw materials,and laser melting deposition（LMd） experiments were conducted with1500 W and 2000 W laser power,*** microstructure characteristic,micro-hardness,and indentation fracture toughness were examined by scanning electron microscope（SEM）,X-ray energy dispersive spectrometer（XEdS） and X-ray diffraction（XRd）.The results showed that the two kinds of as-deposited Nb-17 Si-23 Ti alloy samples were mainly composed of Nbss,（Nb,Ti）3 Si and Ti-rich Nbss,and the microstructure presents rapid directionally-solidified characteristic,in which the <100> crystallographic direction of Nbss and <110> crystallographic direction of（Nb,Ti）3 Si tend to be parallel to the LMd building *** the laser power increasing from 1500 W to 2000 W,the microstructure became more oriented and *** the sample at 2000 W,the dendrite spacing was only about 1-2 μm,and Nbss and（Nb,Ti）3 Si couples grow alternately and they are parallel to the building direction *** the meantime the micro-hardness and indentation fracture toughness reached 1075 HV and 20.3 MPa·m1/2,respectively,indicating significant improvement by the directional growth of fine Nbss and（Nb,Ti）3 Si phases,and the dimple fracture mode of the Nbss dendrites.

关键词： Nb–Si based Alloy Laser melting deposition directional solidification Microstructure characteristic Fracture behaviour

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Progress in Nb-Si ultra-high temperature structural materials:A review

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Journal of Materials Science & technology 2023年第18期149卷 127-153页

作者： Wei Liu Shuai Huang Chengtong Ye Lina Jia Yongwang Kang Jiangbo Sha Bingqing Chen Yu Wu Huaping Xiong 3D Printing Research and Engineering Technology Center Beijing Institute of Aeronautical MaterialsBeijing 100095China School of Materials Science and Engineering Beihang UniversityBeijing 100191China Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical MaterialsBeijing 100095China

Nb-Si based alloys have the greatest potential to replace nickel-based superalloys and become a new gen-eration ultra-high temperature structural material with service temperature of 1200-1400℃ due to their high melting point,high stiffness,low density,and attractive specific mechanical properties at elevated *** article reviewed the recent progress in the development of Nb-Si based refractory *** attention was paid to the property characteristics,preparation techniques,alloying effects,oxidation resistance and fabrication of Nb-Si based alloy ***,the trend of develop-ment in the future was forecasted,including:Optimization of the composition and microstructure of Nb-Si based alloys to achieve a balance of mechanical properties;Comprehensive properties evaluation for Nb-Si based alloys to accumulate sufficient data for engineering applications;development of practical preparation technology for Nb-Si based alloy components with complex shapes;New multilayer compos-ite coatings for Nb-Si based alloy;Joining technology of Nb-Si alloy to itself and to superalloy.

关键词： Nb-Si based alloys Alloying Mechanical property Fracture toughness Oxidation behavior Coating

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Analysis and modelling of damage mechanism in FdM 3d-printed lattice structure under compression loading

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Journal of Mechanical Science and technology 2023年第3期37卷 1089-1095页

作者： Corvi, Alberto Collini, Luca Sciancalepore, Corrado Kumar, Ajeet Department of Engineering and Architecture University of Parma Parma Italy High Speed 3D Printing Research Center National Taiwan University of Science and Technology Keelung Rd Taipei106 Taiwan

Fused filament fabrication (FFF), commercially known as fused deposition modelling (FdM), is a widespread 3d printing process that builds up components by depositing a continuous filament of material, typically a thermoplastic, along a deTermined path. The mechanical performance of such parts is promising, even if strongly influenced by the deposition process. In this work, the mechanical behaviour of a specific lattice structure printed in acrylonitrile butadiene styrene (ABS) is studied and a model of lattice behaviour up to the damage regime is developed, with emphasis on the resulting anisotropy. The investigation starts with the analysis of the anisotropy of simple prismatic samples printed with various filament orientations. deformation and damage of the lattice structure under compressive loading is observed at the meso- and micro-scales. An anisotropic model is then developed within the ABAQUS© environment to reproduce the elasto-plastic behaviour, incorporating onset and evolution of inter- and intra-layer damage. Good agreement is observed between the modelled and experimental response. © 2023, The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature.

关键词： Fabrication

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