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advanced Powder Materials 2023年第3期2卷 77-87页

作者： Xuan Luo Tao Song Feng Wang Haizhou Lu Limei Kang Hongwei Ma Dongdong Li Annett Gebert Chao Yang National Engineering Research Center of Near-net-shape Forming for Metallic Materials Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic MaterialsSouth China University of TechnologyGuangzhou 510640China State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China Institute for Complex Materials Leibniz Institute for Solid State and Materials Research Dresden01069DresdenGermany Guangzhou Railway Polytechnic Guangzhou 510430China

The morphology and distribution of silicides inα/αþβtype titanium alloys impress on their ***,the types of silicide precipitates and their formation mechanisms remain unclear inβ-type Ti–Nb–Zr–Ta *** this study,we report the precipitation behavior of silicides formed upon aging treatment of a laser powder bed fusion(LPBF)-fabricatedβ-type Ti–34.5Nb–6.9Zr–4.9Ta–1.4Si(wt%,TNZTS)*** further discuss their underlying formation mechanism and silicide selection-oriented mechanical properties tailoring for LPBF-fabricated TNZTS *** novel silicide precipitates were formed:a supersaturated Si–richβ–Ti matrix in the form of a network that can further transform into the(Ti,Zr)2Si(S2)phase with the increase of aging temperature;and a short,rod-like S2 precipitate adjacent to pre-existing dot-shaped *** former results from the aggregation of Si solute atoms towards to the dislocation walls/microbands and the subsequent precipitation reaction,while the latter arises from the considerable micro-strain around the phase boundary between the dotshaped S2 andβ-Ti owing to the large difference in their thermal expansion coefﬁ*** aging-treated TNZTS alloy exhibits a good combination of tensile strength(10835 MPa)and fracture strain(5.6%1.0%),which is attributed to precipitation strengthening,grain-boundary strengthening,and discontinuous intergranular silicide derived from phase *** obtained results provide a basis for the design and fabrication of biomedical Sicontainingβ-type Ti alloys with excellent mechanical properties.

关键词： Laser powder bed fusion β-type titanium alloys Silicide precipitates Microstructure Mechanical propertie

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Engineering design of feedstock powder and relevant thermal-mechanical performance of thermal/environmental barrier coatings

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Journal of advanced Ceramics 2025年第2期14卷 37-56页

作者： Xinchang Feng Fangwei Guo Lirong Luo Yuzhang Wang Yun Long Xiaofeng Zhao Fei Pan Lei Guo Qingfeng Zeng Jing Feng Chunlei Wan Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China National Engineering Research Center of Special Equipment and Power System for Ship and Marine Engineering Shanghai 200030China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Advanced Nuclear Energy Technology Nuclear Power Institute of ChinaChengdu 610213China Innovative Sensor Technology IST AG Ebnat-Kappel 9642Switzerland School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Tianmushan Laboratory Hangzhou 311115China School of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

The development of aeroengine with a high thrust-weight ratio poses great challenges for current top-coating thermal barrier coatings (TBCs) and environmental barrier coatings (EBCs) in service. Medium/high-entropy ceramics are highly promising candidate material for advanced TBCs/EBCs owing to their low thermal conductivity, high melting point, high-temperature stability, and calcium–magnesium–alumino–silicate (CMAS) resistance. Most feedstock powder used for medium/high-entropy TBCs/EBCs is prepared via traditional spray drying, which cannot fully exploit the advantages of multicomponent ceramics. The density, sphericity, inner structure, and flowability of feedstock powder affect their melting state during the thermal spraying process, which strongly affects the microstructure and properties of the deposited coatings. Therefore, the deposited coatings exhibit phase segregation, amorphous phases, and microstructure defects owing to unpredictable variations in feedstock powder with random morphologies and structures. Here, the structure and properties of feedstock powder prepared by state-of-the-art granulation technologies and their influences on the deposited coatings were systematically investigated, which can provide guidance for configuration optimization of feedstock powder and the manufacturing accuracy of the deposited coating. This review aims to bridge the gap between cutting-edge ceramics and advanced engineering technologies, thus providing concrete background knowledge and crucial guidelines for designing and developing TBCs/EBCs.

关键词： thermal/environmental barrier coatings(TBCs/EBCs) spraying ceramic powder multiscale structure control high-entropy ceramics thermal-mechanical performance

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Design and Analysis of a Novel Ring Truss Deployable Antenna Mechanism 16th

Design and Analysis of a Novel Ring Truss Deployable Antenna...

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16th International Conference on Intelligent Robotics and Applications, ICIRA 2023

作者： Han, Bo Yuan, Zhantu Zhou, Yuanzhi Liu, Feng Yao, Jiantao Zhao, Yongsheng Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao066004 China

ISBN: (纸本)9789819965038

With the development of astronautics, satellite antenna as an important communication equipment has also gradually developed to large scale. In this paper, a novel ring truss deployable antenna mechanism is proposed. The mechanism has three layers of installation points with height differences between them, which can be used to ensure that all the installation points will be distributed on the profile of the cable network, and this characteristic ensures the mechanism can be utilized to the maximum. Then the degrees of freedom (DOF) and kinematics of the ring truss deployable mechanism are analyzed using screw theory, where the analysis shows that the DOF of the overall ring truss deployable mechanism is equal to one. Following that, the dynamics model about the mechanism unit is established using the second type of Lagrange equations. Based on this dynamic model, the effect of torsion spring stiffness on the deployment process is discussed and the conclusion is verified by simulation. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Trusses

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Microstructure and properties of TiAl/Ti2AlNb joint with TC1 intermediate layer obtained by spark plasma sintering diffusion welding 9

Microstructure and properties of TiAl/Ti2AlNb joint with TC1...

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9th International Conference on Mechanical Engineering, Materials, and Automation technology, MMEAT 2023

作者： Fan, Jiafeng Li, Xiaoqiang Hou, Jinbao Guangdong Key Laboratory for Advanced Metallic Materials Fabrication and Forming National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of Technology Guangzhou510640 China Aeronautical Key Laboratory for Welding and Joining Technologies AVIC Manufacturing Technology Institute Beijing100024 China

ISBN: (纸本)9781510668584

Joining of high Nb content TiAl (TNM) and Ti2AlNb alloy is a research hotspot in aircraft engines. In the work, the TC1 thin was designed as the intermediate layer for joining TNM with Ti2AlNb alloy and the firm joint of TNM/TC1/Ti2AlNb was obtained by spark plasma diffusion welding. The joint was composed of TNM/TNM impacted zone/TC1 with TNM diffusion reaction zone/TC1 with Ti2AlNb diffusion reaction zone/Ti2AlNb impacted zone/Ti2AlNb. The TNM impacted zone consists of γ phase matrix and equiaxed α2 phase and Ti2AlNb impacted zone consists of needle-shaped β phase and α matrix phase. The TC1 diffusion reaction zone was composed of α matrix phase and some large equiaxed β phase and the Nb element from Ti2AlNb is the main reason for the formation of large equiaxed β-phase in this zone. The high temperature tensile strength of the joint at 700 ℃ reached 377 MPa, with the main fracture location at TC1 with TNM diffusion reaction zone. © 2023 SPIE.

关键词： Titanium alloys

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An End-Traction Lower Extremity Rehabilitation Robot: Structural Design, Motion Analysis, and Experimental Validation 23rd

An End-Traction Lower Extremity Rehabilitation Robot: Struct...

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23rd IFToMM China International Conference on Mechanism and Machine Science and Engineering, IFToMM CCMMS 2022

作者： Bian, Hui Yang, Fan Sun, Zhaoliang Li, Jiachen Ding, Jiebin Li, Shuai Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System Yanshan University Hebei Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Ministry of Education of China Hebei Qinhuangdao066004 China

ISBN: (纸本)9789811993978

An end-traction lower extremity rehabilitation robot named ETLER is designed to meet the rehabilitation needs of patients with lower extremity dysfunction at all stages of recovery, while taking into account the ease of operation for the patient. A single robot can meet the needs of a hemiplegic patient on either side for the designed end-change structure. The robots can also be used in pairs for patients with spinal cord injuries. Meanwhile, the adjustable ankle joint limit design provides customized training programs for the ankle joint. To carry out the trajectory planning of the rehabilitation robot, kinematic analysis and control strategy modeling of the robot and human–machine system are carried out. The functionality and universality of the rehabilitation robot are verified through comparative tests. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Machine design

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Study on the effect of fiber tension on the tensile properties of CAF/PA12 composites 9

Study on the effect of fiber tension on the tensile properti...

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9th International Conference on Mechanical Engineering, Materials, and Automation technology, MMEAT 2023

作者： Zou, Dongming Shan, Zhongde Liu, Feng Ren, Yongxin Wu, Siyuan Jiang, Xibin State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology Beijing100044 China Beijing National Innovation Institute of Lightweight Ltd. China

ISBN: (纸本)9781510668584

The lack of fiber restraint during the preparation of continuous fiber-reinforced thermoplastic resin composite filaments makes the fibers inside the composite filaments prone to curl and deflection, which affects the mechanical properties of the composites. This study aimed to investigate the impact of fiber tension on the tensile properties of continuous aramid fiber (CAF)/nylon 12(PA12) resin composite filaments and molded parts. Tensile properties experiments of tensile specimens were conducted in conjunction with acoustic emission (AE) instruments and computed tomography (CT). The results showed that the tensile properties of the CAF/PA12 composite filament and its specimens rose first with the increasing of fiber tension during the filament preparation and then fell. The tensile strength of the CAF/PA12 composite filament reached the maximum value of 1272.05 MPa at the fiber tension of 3 N, which was about 15.92% higher than that without fiber tension, the maximum tensile breaking load of the tensile specimens is 15.31kN, which is about 16.47% higher than that without fiber tension. Using AE to collect the energy signal during the damage process. It is observed that the medium energy signal appears lagged when the fiber tension is too high, when there is a hysteresis in the medium energy signal, which means that the strength of the interfacial bond between the fiber and the resin is increased. CT scans of the composite filaments prepared at different fiber tensions revealed that when the fiber tension increased from 0N to 3N, the bent fibers inside the filaments decreased and the fiber orientation coefficient increased;when the fiber tension was further increased to 5N, some fibers broke and more pores appeared inside the filaments. © 2023 SPIE.

关键词： 3D printing

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Revealing the solid electrolyte interface on calcium metal anodes

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Journal of Energy Chemistry 2022年第7期31卷 174-190,I0005页

作者： Yumeng Zhao Aoxuan Wang Libin Ren Xingjiang Liu Jiayan Luo Key Laboratory for Green Chemical Technology of Ministry of Education State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin UniversityTianjin 300072China Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China National Key Laboratory of Science and Technology on Power Sources Tianjin Institute of Power SourcesTianjin 300384China

Owing to its low potential, crustal abundances and environmental friendliness, calcium metal anode(CMA) is emerging as a powerful contender in post-lithium era. However, the passivation of CMA fatally hinders its development. Recently, several feasible electrolytes have been developed. Nevertheless, as a pivotal part, the solid electrolyte interface(SEI) formed on CMA has not been paid enough attention to. In this review, based on the passivation mechanism of CMA, the favorable composition of SEI is emphasized with the corresponding electrolytes. It is considered that boron-containing and organic–inorganic hybrid SEI might be preferred. By comparing electrolytes and SEI on CMA with lithium and magnesium metal anodes, the root causes of CMA passivation are further elaborated, enlightening rational design rules of suitable SEI. Furthermore, some noteworthy details when assembling secondary calcium metal batteries(CMBs) are put forward. It is expected that deeper understanding of SEI on CMA will promote the development of CMBs.

关键词： Solid electrolyte interface Calcium metal anode Reversible deposition Passivation mechanism

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Grain morphology and plasticizing mechanism of AZ31 magnesium alloy curved profiles by staggered extrusion

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Journal of Central South University 2025年第2期32卷 319-331页

作者： CHEN Zi-yu LI Feng LI Yuan-qi LI Chao SUN Lu School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150040China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin 150080China Heilongjiang Provincial Key Laboratory of Light Metal Materials Modification&Green Forming Technology Harbin 150040China

Traditional manufacturing processes for lightweight curved profiles are often associated with lengthy procedures,high costs,low efficiency,and high energy *** order to solve this problem,a new staggered extrusion(SE)process was used to form the curved profile of AZ31 magnesium alloy in this *** study investigates the mapping relationship between the curvature,microstructure,and mechanical properties of the formed profiles by using different eccentricities of the *** electron microscopy(SEM)and electron backscatter diffraction techniques are employed to examine the effects of different eccentricity values(e)on grain morphology,recrystallization mechanisms,texture,and Schmid factors of the *** results demonstrate that the staggered extrusion method promotes the deep refinement of grain size in the extruded products,with an average grain size of only 15%of the original billet,reaching 12.28μ*** tensile strength and elongation of the curved profiles after extrusion under the eccentricity value of 10 mm,20 mm and 30 mm are significantly higher than those of the billet,with the tensile strength is increased to 250,270,235 MPa,and the engineering strain elongation increased to 10.5%,12.1%,15.9%.This indicates that staggered extrusion enables curvature control of the profiles while improving their strength.

关键词： staggered extrusion eccentricity curved profiles microstructure mechanical properties

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On the oxidation and interdiffusion behavior of an AlCoCrFeNiY high-entropy alloy bond coat on a directionally solidified Ni-based superalloy

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Journal of Materials Science & technology 2024年第19期186卷 64-78页

作者： Xuanzhen Liu Ying Chen Ling Li Aihui Huang Han Zhang Xiancheng Zhang Jie Lu Xiaofeng Zhao Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Materials The University of ManchesterManchester M139PLUnited Kingdom The Henry Royce Institute The University of ManchesterManchester M139PLUnited Kingdom Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China

The oxidation and interdiffusion behavior of a novel AlCoCrFeNiY bond coat deposited on a directionally solidified Ni-based superalloy were systematically studied at 1050,1100 and 1150°C,and compared with a conventional NiCoCrAlY coating deposited on the same *** AlCoCrFeNiY bond coat exhibits lower oxide growth rates due to its large columnar grains and low Al activity at the oxide scale/bond coat ***,AlCoCrFeNiY has higher resistance to oxide spallation than NiCoCrAlY,which is attributed to the formation of a clean and defect-free metal/oxide *** interdiffusion occurs across the AlCoCrFeNiY/superalloy substrate *** experimental evidence and thermody-namic modelling suggest that Fe accelerates interdiffusion and destabilizes theγ’phase,thereby causing the formation of a thick andγ’-depleted interdiffusion *** addition,the AlCoCrFeNiY bond coat un-dergoes more Al depletion and subsequentβtoγtransformation compared with *** on the findings in this work,a novel AlCoCrFeNiY/NiCoCrAlY double-layer bond coat was designed,tested and validated to achieve optimal balance between oxidation and interdiffusion.

关键词： AlCoCrFeNi bond coat Directionally solidified Ni-based superalloy Oxidation Interdiffusion High velocity air-fuel spraying

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Processable Potassium Metal Anode for Stable Batteries

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Energy & Environmental Materials 2022年第4期5卷 1278-1284页

作者： Zhenghang Wei Aoxuan Wang Xuze Guan Guojie Li Zhiwei Yang Chengde Huang Jing Zhang Libin Ren Jiayan Luo Xingjiang Liu Key Laboratory for Green Chemical Technology of Ministry of Education State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Key Laboratory of Materials Processing and Mold Zhengzhou UniversityMinistry of EducationZhengzhou 450002China Jiangxi Key Laboratory of Nanobiomaterials Institute of Advanced MaterialsEast China Jiaotong UniversityNanchang 330013China National Key Laboratory of Science and Technology on Power Sources Tianjin Institute of Power SourcesTianjin 300384China Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The future of high-energy density electrochemical energy storage systems relies on the advancement of rechargeable batteries that utilize reactive metals as *** the alkaline metal,secondary battery systems because of abundant resource,high capacity and low redox potential,potassium(K)metal secondary battery(KMB)is expected to replace the existing lithiumion battery as a versatile platform for high-energy density,cost-effective energy storage ***,the difficulty in processing metal K results in nonstandard electrodes and hinders the development of ***,the mobility of the K metal anode due to its unique lowmelting point character at elevated temperatures in practical conditions leads to severe instability and risks in chemical/electrochemical ***,we fabricate a processable and moldable composite K metal anode by encapsulating K into reduced graphene oxide(rGO).The composite electrode can be engineered into various shapes discretionarily with precise sizes and stabilize the K metal anode at relatively high ***,the composite anode exhibits excellent cycling performance at high current density(8 mA cm^(-2)) with dendrite-free *** with a Prussian blue cathode,the rGO-K composite anode shows much improved electrochemical performance and extended lifetime.

关键词： K metal anode K metal battery processibility reduced graphene oxide stability

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