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Mutual promotion on the mechanical and tribological properties of the nacre-like self-lubricant film designed for demanding green tribological applications

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Friction 2025年第3期13卷 171-185页

作者： Hongbo Ju Jing Luan Yiping Wang Andrey Bondarev Manuel Evaristo Yaoxiang Geng Junhua Xu Albano Cavaleiro Filipe Fernandes School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Department of Mechanical Engineering ARISECEMMPREUniversity of CoimbraCoimbra 3030-788Portugal TINT-Laboratory for Tribology and Interface Nanotechnology Faculty of Mechanical EngineeringUniversity of LjubljanaAškerčeva 6Ljubljana1000Slovenia School of Engineering Bernal InstituteUniversity of LimerickLimerick V94 T9PXIreland ISEP-School of Engineering Polytechnic of PortoPorto 4200-072Portugal

The inverse relationship between the tribological and mechanical properties of environmentally friendly selflubricant films,induced by the addition of soft lubricant agents that can diffuse quickly at elevated temperatures,has hindered the widespread use of these materials in industrial *** paper took this challenge to break through the above established relationship by developing novel nacrelike multilayered Mo_(2)N–SiN_(x)/Ag–SiN_(x)self-lubricant films via an radio frequency(RF)magnetron sputtering system for real applications where harsh conditions at elevated temperatures *** multilayered films,deposited by alternating deposition of Mo_(2)N–SiN_(x)and Ag–SiN_(x)modulation layers,exhibited three phases of face-centered cubic(fcc)Mo_(2)N,fcc Ag and SiN_(x),where SiN_(x)encapsulated the nano-crystalline Mo_(2)N and Ag phases in each layer to successfully induce a“brick and mortar”nacre-like microstructure(in the area without the coherent structure).The epitaxy growth of the Ag–SiN_(x)layers with thickness below 6 nm on the Mo_(2)N template resulted in an extraordinary increase in both the hardness and elastic modulus,which was able to prevent severe degradation of the mechanical properties caused by the addition of *** room-temperature anti-friction property could be enhanced by increasing the Ag–SiN_(x)layer thickness due to the excellent lubricant nature of Ag,which acts in synergy with Mo_(2)N,while the wear rate below 4×10^(−8)mm^(3)/(N·mm)was due to the high mechanical *** tribological properties at 600℃also benefited from the interlocked multilayered architecture,which allowed an extreme low friction coefficient of~0.12 and a negligible wear rate(WR).This behavior was attributed to the synergism between the lubricant action of Ag and Mo_(2)N and the tribo-phase transformation from Ag_(2)Mo_(4)O_(13)to Ag_(2)MoO_(4).

关键词： radio frequency(RF)magnetron sputtering system Mo_(2)N-SiN_(x)/Ag-SiN_(x)self-lubricant films interlocked structure epitaxial growth lubrication synergism tribo-phase transformation

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A First-principles Study on the Adhesion Strength,Interfacial Stability,and Electronic Properties of Mg/Mg_(2)Y Interface

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Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 537-550页

作者： Yunxuan Zhou Wenjun Tian Quan Dong Hailian Wang Jun Tan Xianhua Chen Kaihong Zheng Fusheng Pan College of Materials Science and Engineering National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400044China State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400044China Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China

The interfacial microstructures and configurations directly affect the comprehensive properties of the composites,but their interfacial adhesion mechanism is complicated to expound by experimental *** this work,based on the stacking sequence of the Mg/Mg_(2)Y interface models,nine different Mg/Mg_(2)Y interface configurations with top site,bridge site,and hollow site(HCP)under Mg1,Mg_(2),and Y terminations were successfully constructed and systematically explored by first-principles *** results showed that the Mg_(2)Y(0001)surface with Y termination is the most stable when the yttrium chemical potential()is less than-1.09 eV;otherwise,Mg_(2)Y(0001)surface with Mg1 termination is the most *** seven-layer Mg(0001)and eleven-layer Mg_(2)Y(0001)slabs are employed to reflect the bulk-like interior ***,the Mg(0001)/Mg_(2)Y(0001)with the Y-HCP stacking has the largest interface thermodynamic stability with the value of 2.383 J/m^(2) in all interface configurations owing to its largest work of *** addition,the interfacial energy of Y-HCP stacking is significantly smaller than those of Mg1-HCP when is approximately less than-0.55 eV,showing that it is more *** thermodynamic stability of Mg/Mg_(2)Y with Y-HCP is due to Mg-Y chemical bonds formed between Mg and Y ***,the Mg/Mg_(2)Y interfaces are strong interfaces based on the Griffith fracture theory.

关键词： Mg/Mg_(2)Y interface Interface stability Work of adhesion Electronic structure First-principles calculations

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Microstructure and mechanical properties of SiC/Inconel 718 joints brazed with CoFeCu3.5Mn3.5Cr high-entropy alloy filler

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Journal of Iron and Steel Research International 2024年第10期31卷 2590-2599页

作者： Hong Li Bo-jin Li Yun-yue Li Tian-ran Ding Jian Qin Erika Hodúlová Yi-peng Wang College of Materials Science and Engineering Beijing University of TechnologyBeijing100124China Zhengzhou Research Institute of Mechanical Engineering Co. Ltd.Zhengzhou450001HenanChina Institute of Materials and Machine Mechanics Slovak Academy of SciencesBratislava84513Slovak Republic

Achieving high-quality joining of silicon carbide(SiC)ceramics and Inconel 718 alloy has become a significant challenge for the brazing process,which is strongly dependent on the filler material.A novel composite interlayer consisting of high-entropy alloys(HEAs),HEA/Ni/HEA,was proposed to reduce the formation of intermetallic compounds in the brazed joints of SiC ceramics and Inconel 718 alloy.A reliable SiC/Inconel 718 brazed joint was produced at 1120℃ for 60 *** results showed a significant reduction in the number of NiSi compounds in the brazed *** brazing seam structure near SiC side was filled with face-centered cubic phases with good plasticity and soft Cu-rich phases due to the high-entropy effect,which effectively suppressed the formation of intermetallic *** maximum shear strength of the brazed joint reached 88 MPa,showing excellent tensile *** results provide a valuable basis for improving the joint quality of SiC ceramics and metals by adding high-entropy alloy fillers.

关键词： High-entropy alloy SiC ceramics Inconel 718 alloy Brazing Composite interlayer

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Room and cryogenic deformation behavior of AZ61 and AZ61-xCaO(x=0.5,1 wt.%)alloy

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Journal of Magnesium and Alloys 2024年第5期12卷 1996-2009页

作者： Umer Masood Chaudry Hafiz Muhammad Rehan Tariq Nooruddin Ansari Soo Yeol Lee Tea-Sung Jun Department of Mechanical Engineering Incheon National UniversityIncheon 22012Republic of Korea Research Institute for Engineering and Technology Incheon National UniversityIncheon 22012Republic of Korea Department of Materials Science&Engineering Chungnam National UniversityDaejeon 34134Republic of Korea

This study investigates the influence of CaO(0.5,1(wt.%))alloying on the microstructural evolution,texture development and deformation behavior of AZ61 magnesium *** uniaxial tension tests at room(RT)and cryogenic(CT,-150℃)temperature were performed to investigate the twinability and dislocation behavior and its consequent effect on flow stress,ductility and strain hardening *** results showed that the AZ61-1CaO exhibited superior strength/ductility synergy at RT with a yield strength(YS)of 223 MPa and a ductility of 23% as compared to AZ61(178 MPa,18.5%)and AZ61-0.5CaO(198 MPa,21%).Similar trend was witnessed for all the samples during CT deformation,where increase in the YS and decrease in ductility were *** Mtex tools based in-grain misorientation axis(IGMA)analysis of RT deformed samples revealed the higher activities of prismatic slip in AZ61-CaO,which led to superior ***,subsequent EBSD analysis of CT deformed samples showed the increased fraction of fine{10-12}tension twins and nucleation of multiple{10-12}twin variants caused by higher local stress concentration at the grain boundaries,which imposed the strengthening by twin-twin ***,the detailed investigations on strengthening contributors showed that the dislocation strengthening has the highest contribution towards strength in all samples.

关键词： Magnesium Twinning Twinning variant EBSD Cryogenic deformation

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Electronic characteristic,tensile cracking behavior and potential energy surface of TiC(111)/Ti(0001)interface:A first principles study

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Chinese Journal of Aeronautics 2023年第9期36卷 451-463页

作者： Silong ZHANG Jibo WANG Lixiang RAO Qizhen HE Xiaolei XING Yefei ZHOU Qingxiang YANG State Key Lab of Metastable Materials Science&Technology Hebei Key Lab for Optimizing Metal Product Technology and PerformanceCollege of Materials Science&EngineeringYanshan UniversityQinhuangdao 066004China College of Physics and Mechanical&Electrical Engineering Longyan UniversityLongyan 364012China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

The preparation of TiC coating on Ti alloy surface to improve the wear resistance has attracted attention from researchers in aerospace *** service life of TiC coating is related to the interfacial adhesion properties between TiC coating and Ti alloy ***,it is difficult to explain its interfacial adhesion mechanism by experimental *** on the termination of atoms on the TiC surface,two TiC/Ti interface models named as the C-terminated-TiC(111)/Ti(0001) and Ti-terminated-TiC(11)/Ti(0001) interface were constructed by *** interfacial electronic characteristic of C-Ti bond is a mixture of polar covalent and metal bonds,and that of Ti-Ti bond is the metal *** tensile strains of both C-terminated-TiC(111)/Ti(0001) and Ti-terminated-TiC(111)/Ti(0001) interface in the fracture stage are ranged from 12% to 14%.Their maximum tensile stresses are 16.201 GPa and 15.590GPa,*** sliding potential energy surface maximum of C-terminated-TiC(111)/Ti(0001) and Ti-terminated-TiC(111)/Ti(0001) interface are 5.387 J/m^(2) and 0.271 J/m^(2),*** the sliding potential barriers on the minimum energy path are 2.094 J/m2and 0.136 J/m^(2) with an ideal shear strength of 20.32 GPa and 1.61 GPa,*** summary,the interfacial adhesion property of C-terminated-TiC(111)/Ti(0001) interface is better than that of Ti-terminated-TiC(111)/Ti(0001) interface.

关键词： Electronic First-principles Potential energy surface Tensile TiC/Ti interface

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Development of Fe-Mn-Si-Cr-Ni shape memory alloy with ultrahigh mechanical properties and large recovery strain by laser powder bed fusion

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Journal of materials science & Technology 2023年第19期150卷 201-216页

作者： Xiao Yang Lijin Cheng Huabei Peng Bingnan Qian Lei Yang Yunsong Shi Annan Chen Zhengyan Zhang Libin Zhao Ning Hu Chunze Yan Yusheng Shi State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Mechanical Engineering Hebei University of TechnologyTianjin 300401China School of Mechanical Engineering Sichuan UniversityChengdu 610065China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China School of Transportation and Logistics Engineering Wuhan University of TechnologyWuhan 430070China Department of Orthopaedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China

This work systematically studied the effect of volumetric energy density E on the densification,mi-crostructures,tensile mechanical properties,and shape memory performance of a Fe-Mn-Si-Cr-Ni shape memory alloy(SMA)fabricated by laser powder bed fusion(L-PBF).An E of 90-265 J/mm3 is suggested to fabricate the Fe-Mn-Si-Cr-Ni SMA with minor metallurgical defects and a high relative density of above 99%.The increase in E can promote the formation of the primaryγaustenite and the solid phase trans-formation from the primaryδferrite to theγaustenite,which helps to achieve a nearly complete y austenitic *** increase in E also contributes to fabricating the Fe-Mn-Si-Cr-Ni SMA with superior comprehensive mechanical properties and shape memory performance by *** Fe-Mn-Si-Cr-Ni SMA with a combination of good ductility of around 30%,high yield strength of above 480 MPa,an ultrahigh ultimate tensile strength of above 1 GPa,and large recovery strain of about 6%was manu-factured by L-PBF under a high E of 222-250 J/mm^(3).The good shape memory effect,excellent compre-hensive mechanical properties,and low cost of Fe-Mn-Si-Cr-Ni SMAs,as well as the outstanding ability to fabricate complex structures of L-PBF technology,provide a solid foundation for the design and fabri-cation of novel intelligent structures.

关键词： Shape memory alloys Fe-Mn-Si-based alloys Laser powder bed fusion mechanical property Microstructure

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Temperature-triggered liquid metal actuators for fluid manipulation by leveraging phase transition control

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International Journal of Smart and Nano materials 2024年第4期15卷 730-742页

作者： Hongda Lu Jiayi Yang Mengqing Zhao Qingtian Zhang Jialu Wang Xiangbo Zhou Yipu Guo Liping Gong Zexin Chen Shi-Yang Tang Weihua Li School of Mechanical MaterialsMechatronic and Biomedical EngineeringUniversity of WollongongWollongongAustralia School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijingP.R.China School of Mechanical and Manufacturing Engineering University of New South WalesSydneyAustralia School of Electronics and Computer Science University of SouthamptonSouthamptonUK

Small-scale pumps for controlling microfluidics have promising applications in drug delivery and chemical *** metal(LM)demonstrates excellent flow pumping performance due to its simple structure and the electrocapillary effect under an electric ***,LM droplets risk escaping from constrained structures,which can lead to pump *** regulation is also a critical parameter in optimizing chemical reactions in fluidic systems,however,integrating it into a compact system remains ***,we develop a temperature-triggered gallium-based actuator(TTGA)by introducing a gallium(Ga)droplet wetted on a copper(Cu)plate as the core element for flow *** Cu plate prevents the Ga droplet from escaping the chamber and significantly increases the flow *** leveraging the electrochemical method to inhibit the supercooling effect of Ga,the TTGA enables activation/deactivation for flow actuation at different *** investigate the impact of electrode position,solution concentration,and applied voltage on TTGA’s pumping *** dynamically tuning the Ga droplet’s temperature to control phase transition,TTGA allows for accurate flow actuation ***,placing Ga and eutectic Ga-indium(EGaIn)droplets in different channels enables the expected flow divergence for fluids with different *** development of TTGA presents new opportunities in microfluidics and biomedical treatment.

关键词： Liquid metal actuators temperature sensation phase transition

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Simulation of the Heat Transfer during the Casting Process by Mirror U-Net Models

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Defect and Diffusion Forum 2024年 433卷 97-104页

作者： Kang, Jinwu Zhao, Qichao Wang, Jiwu Han, Xiao Yang, Yahui School of Materials Science and Engineering Key Laboratory for Advanced Materials Processing Technology Tsinghua University Beijing100084 China School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing100044 China

Deep learning has achieved great progress in image recognition, segmentation, semantic recognition, and game theory. It also shows potential to solve scientific computing such as simulation problems in engineering. On the other hand, the numerical simulation method requires constitutive modelling, involves a huge computation volume and takes a long time. In this paper, two mirror U-Net models were proposed for the simulation of the heat transfer during the casting process. These models include an upper U-Net branch for the treatment of the geometries of casting, mold, and chill, and a lower U-Net branch for the treatment of the initial temperature field. Their difference is whether the bottoms of upper and lower U-Nets are shared. These two branches tackle the problems involving the input of a geometrical model which consists of three types of materials and the input of an initial or current temperature field image. These models were trained and validated with a big database with hundreds of casting shapes. The prediction results show that the average accuracy reaches 98.8%. © 2024 Trans Tech Publications Ltd, Switzerland.

关键词： Semantic Segmentation

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An Analytical Model for the Linear Variable Differential Transformer

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IEEE Sensors Journal 2025年第11期25卷 19522-19531页

作者： Gao, Yuan Spirnock, William Ban, Heng University of Pittsburgh Department of Mechanical Engineering and Materials Science PittsburghPA15213 United States

The linear variable differential transformer (LVDT) is widely used for displacement measurement in both industry and research due to its high accuracy and working ability in harsh environments. However, the lack of a precise and detailed analytical model limits the application and development of the LVDT. The traditional LVDT model, the magnetic circuit model, and finite element method (FEM) models all have limitations when it comes to customizing LVDT designs for specific applications. This paper builds an analytical model for the LVDT by solving Maxwell's equations, which can investigate a broader range of parameters to design LVDTs. The truncated region eigenfunction expansion method, based on the magnetic vector potential, is used to solve the finite-length magnetic core problem. The model is validated by experiments, showing the maximum discrepancy is smaller than 1.5%. FEM is used to validate the model in a broader range of parameters, and the maximum discrepancy between the model results and FEM is below 0.9% at different working frequencies and magnetic core permeabilities. The paper presents an example of using the model to investigate LVDT parameters' influences on the output's sensitivity and linearity error, quantifying the impact of the magnetic core's geometric parameters. This model can optimize LVDT design and facilitate the advancement of LVDT-related sensors. © 2001-2012 IEEE.

关键词： Maxwell equations

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An atomic insight into effect of grain boundary on diffusion behavior of Cu/Al dissimilar materials undergoing ultrasonic welding

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Journal of Iron and Steel Research International 2024年第10期31卷 2555-2567页

作者： Jing-wei Yang Chu-hao Xie Jie Zhang Zong-ye Ding Jian Qiao School of Mechatronic Engineering and Automation Foshan UniversityFoshan528225GuangdongChina School of Mechanical Engineering University of Science and Technology BeijingBeijing100083China Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China State Key Laboratory of Advanced Brazing Filler Metals&Technology Zhengzhou Research Institute of Mechanical Engineering Co.Ltd.Zhengzhou450001HenanChina

The diffusion processes in bicrystalline Cu/Al joints,characterized by typical high-angle grain boundaries(GBs),were investigated using molecular dynamics *** was found that GBs facilitated the diffusion of both Cu and Al atoms,predominantly enhancing the migration of Cu atoms into Al *** to mean squared displacement results,the movement of Al atoms within Al matrix was more vigorous than that of Cu *** mechanisms of atomic rearrangement,dislocation movement,stacking fault formation,and dynamic recrystallization were *** the compression and initial welding stages,the mismatch in lattice constants and the twisting of grains initiated a squeeze-induced rearrangement of Al atoms at the interface,leading to the formation of dislocations and *** the advanced stages of welding,the plastic deformation primarily occurred within Al matrix,marked by the emergence of dislocations,stacking faults,and GB ***,the shearing effect during the ultrasonic welding process,combined with GB sliding,collectively induced grain recrystallization at the ***,the diffusion between Cu/Al joints could be enhanced by increasing the vibration frequency,due to a significant rise in the number of amorphous regions.

关键词： Grain boundary Molecular dynamics Diffusion behavior Ultrasonic welding Dissimilar material

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