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Evidence of microstructural evolution linked to non-monotonic distribution of micromechanical properties induced by shot peening

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材料科学技术（英文版） 2025年第4期207卷 238-245页

作者： Guoxin Lu Qiang Wang Bonnie Attard Huhu Su Shijian Zheng Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationSchool of Materials Science and EngineeringShandong UniversityJinan250061China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical MaterialsBeijing100095China Department of Metallurgy and Materials Engineering University of MaltaMSD2080Malta Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin300130China

The residual stress field induced by surface strengthening processes such as mechanical shot peening and other forms of plastic deformation does not generally exhibit a simple"monotonic"distribution *** researchers have analyzed this fact from a mechanical perspective based on Hertz ***,the micro/nano-scale microstructural changes corresponding to the distribution of residual stress fields still appear to be *** this study,we focused on a widely used material in aviation manufacturing,namely nickel-based superalloy GH4169,as our experimental *** subjected GH4169 alloy to me-chanical strengthening treatment using a shot peening intensity of 0.25 mmA,followed by quantitative testing of micromechanical performance indicators such as microhardness and residual *** thor-oughly investigate the relationship between micromechanical properties and microstructure changes,we utilized transmission electron microscopy(TEM)to observe and analyze shot-peened materials at differ-ent *** findings revealed that the most severe microstructural distortion induced by mechanical shot peening in GH4169 alloy was likely to occur within a depth range of 25 to 75 *** observation aligns with the actual phenomenon that the maximum microhardness and maximum residual compres-sive stress did not manifest on the outermost surface of the *** presenting a detailed analysis of deformation defects such as dislocations,stacking faults,and twinning in different depths of mechan-ically strengthened layers,our study contributes to a deeper understanding and practical application of post-processing technologies based on plastic deformation.

关键词： Mechanical shot peening Surface strengthening Residual stress Microstructure

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Effects of friction stir processing and nano-hydroxyapatite on the microstructure,hardness,degradation rate and in-vitro bioactivity of WE43 alloy for biomedical applications

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Journal of Magnesium and Alloys 2024年第1期12卷 209-224页

作者： Bo Wu Farazila Yusof Fuguo Li Huan Miao A.R.Bushroa Mohd Ridha Bin Muhamad Irfan Anjum Badruddin Mahmoud Z.Ibrahim Department of Mechanical Engineering Faculty of EngineeringUniversiti MalayaKuala Lumpur 50603Malaysia Centre of Advanced Manufacturing and Material Processing(AMMP Centre) Universiti MalayaKuala Lumpur 50603Malaysia Center of Foundation studies in Science Universiti MalayaKuala Lumpur 50603Malaysia State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Mechanical Engineering Department College of EngineeringKing Khalid UniversityAbha 61421Saudi Arabia Design and Production Engineering Faculty of EngineeringAin Shams UniversityCairo 11517Egypt

Nowadays,magnesium alloys are emerging in biomedical implants for their similar properties to natural ***,the rapid degradation of magnesium alloys in biological media hinders successful *** of microstructure,as well as reinforcement particles can significantly improve the degradation *** this work,multi-pass friction stir processing(FSP)was proposed to synthesize WE43/nano-hydroxyapatite(n HA)surface composite,the microstructure,reinforced particle distribution,micro-hardness,corrosion behavior and in-vitro bioactivity were *** subsequent FSP passes of WE43 alloy and WE43/n HA composite refined the grain size which was reduced by 94.29%and 95.92%(2.63 and 1.88μm,respectively)compared to base metal after three *** resulted in increasing the microhardness by 120%(90.86 HV0.1)and 135%(105.59 HV0.1)for the WE43 and WE43-n HA,*** is found that increasing FSP passes improved the uniform distribution of n HA particles within the composite matrix which led to improved corrosion resistance and less degradation *** corrosion rate of the FSPed WE43/n HA composite after three passes was reduced by 38.2%(4.13 mm/year)and the degradation rate was reduced by 69.7%(2.87 mm/y).This is attributed to secondary phase(Mg24Y5and Mg41Nd5)particle fragmentation and redistribution,as well as a homogeneous distribution of n ***,the growing Ca-P and Mg(OH)2layer formed on the surface represented a protective layer that reduced the degradation *** wettability test revealed a relatively hydrophilic surface with water contact angle of 49.1±2.2°compared to 71.2±2.1°for base ***,biomineralization test showed that apatite layer grew after immersion 7d in simulated body fluid with atomic ratio of Ca/P 1.60 approaching the stoichiometric ratio(1.67)indicating superior bioactivity of FSPed WE43/n HA composite after three *** results raise that the grain refinement by FSP and introduction of n HA partic

关键词： Friction stir processing Magnesium-based composite Nano-hydroxyapatite Corrosion behavior In-vitro bioactivity

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Operando reconstruction towards stable CuI nanodots with favorable facets for selective CO_(2) electroreduction to C2H4

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Science China Chemistry 2023年第6期66卷 1834-1843页

作者： Wenjie Xue Hongxia Liu Xinqing Chen Xiaoju Yang Ruoou Yang Youwen Liu Minghao Li Xuan Yang Bao Yu Xia Bo You Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry and Chemical Engineering Wuhan Textile UniversityWuhan 430200China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China State Key Laboratory of Materials Processing and Die&Mold Technology and School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

Cu-based electrocatalysts with favorable facets and Cu^(+)can boost CO_(2) reduction to valuable multicarbon ***,the inevitable Cu^(+)reduction and the phase evolution usually result in poor ***,we fabricate CuI nanodots with favorable(220)facets and a stable Cu^(+)state,accomplished by operando reconstruction of Cu(OH)_(2) under CO_(2)-and I--containing electrolytes for enhanced CO_(2)-to-C_(2)H_(4) *** X-ray absorption spectroscopy(XAS),in-situ Raman spectroscopy and thermodynamic potential analysis reveal the preferred formation of *** gas electroresponse and density functional theory(DFT)calculations reveal that CO_(2)-related species induce the exposure of the(220)plane of Cu ***,the small size of nanodots enables the adequate contact with I^(-),which guarantees the rapid formation of Cu I instead of the electroreduction to Cu^(0).As a result,the resulting catalysts exhibit a high C2H4 Faradaic efficiency of 72.4%at a large current density of 800 m A cm^(-2) and robust stability for 12 h in a flow *** in-situ ATR-SEIRS spectroscopic characterizations and DFT calculations indicate that the(220)facets and stable Cu^(+) in CuI nanodots synergistically facilitate CO_(2)/*CO adsorption and*CO dimerization.

关键词： CO_(2)reduction reaction cuprous iodide favorable facets halogen electrolyte reconstruction

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Nitrogen doped porous carbon-based bifunctional oxygen electrocatalyst with controllable phosphorus content for zinc-air battery

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Nano Research 2023年第4期16卷 5887-5893页

作者： Shichang Cai Zihan Meng Gaojie Li Yu An Yapeng Cheng Erjun Kan Bo Ouyang Haining Zhang Haolin Tang School of Material Science and Engineering Henan University of TechnologyZhengzhou 450001China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong LaboratoryXianhu Hydrogen ValleyFoshan 528200China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Applied Physics and Institution of Energy and Microstructure Nanjing University of Science and TechnologyNanjing 210094China

The controllable construction of non-noble metal based bifunctional catalysts with high activities towards oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is of great significance,but remains a ***,we reported an effective method to synthesize cobalt-nitrogen doped mesoporous carbon-based bifunctional oxygen electrocatalyst with controllable phosphorus content(Co-N-P_(X)-MC,X=0.5,1.0,1.5,2.0).The mesoporous carbon substrate endowed the asprepared samples with more exposed active surface(236.50 m^(2)·g^(−1))and the most appropriate doping ratio of phosphorus had been investigated to be 1.5(Co-N-P1.5-MC).For ORR,Co-N-P1.5-MC exhibited excellent catalytic activity with more positive onset potential(1.01 V)and half-wave potential(0.84 V)than the other *** OER,Co-N-P1.5-MC also showed a low overpotential of 415 *** experimental results and density-functional theory(DFT)calculations,the outstanding bifunctional catalytic performance of Co-N-P1.5-MC was due to the synergistic cooperation between the P and N dopants,which could reduce the reaction barriers and was favorable for ORR and ***,the Zn-air battery using Co-N-P1.5-MC as the cathode showed remarkable battery performance with high stability(could operate stably for over 160 h at 10 mA·cm^(−2))and maximum power density(119 mW·cm^(−2)),demonstrating its potential for practical *** work could provide significant enlightenment towards the design and construction of bifunctional oxygen electrocatalyst for next-generation electrochemical devices.

关键词： cobalt-nitrogen doped porous carbon phosphorus doping bifunctional electrocatalyst oxygen reduction reaction(ORR)and oxygen evolution reaction(OER) Zn-air battery

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Microstructure and Mechanical Properties of Extruded Mg-Y-Zn-Ni-Co Alloy 75

Microstructure and Mechanical Properties of Extruded Mg-Y-Zn...

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75th World Foundry Congress, WFC 2024

作者： An, Binxin Jiang, Jing Xu, Haobin Li, Yuandong Chen, Tijun Bi, Guangli Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou730050 China School of Material Science and Engineering Lanzhou University of Technology Lanzhou730050 China

Microstructure and mechanical properties of Mg-2Y-0.5Zn-0.5Ni-0.5Co (MYZNC, at.%) alloy were investigated in the as-cast, homogeneous and extruded states. The as-cast MYZNC alloy mainly consisted of α-Mg matrix, gray lamellar 18R LPSO phase, and white irregular Mg2Y, MgY(Co,Zn,Ni)4, and granular Mg3(Co,Zn,Ni,Y) phases. After homogenization treatment, a large number of strip-like 14H LPSO phases precipitated in the grain interior. After hot extrusion, the alloy occured obvious dynamic recrystallization with a significant grain refinement from 46.5 μm in the homogenized state to 2.98 μm in the extruded state, while the second phases were fragmented and distributed along the extrusion direction. The tensile testing results indicated that the extruded MYZNC alloy exhibited the good tensile strengths as compared with the as-cast and homogenized alloys, whose ultimate tensile strength (σb), yield strength (σ0.2) and elongation to failure (Εf) of were 280 MPa, 225 MPa and 11.7%, respectively. The high tensile properties of the extruded alloy were mainly attributed to the grain refinement and the second-phase strengthening by the high volume fraction of LPSO phase. In addition, the homogenized appeared a more pronounced strain hardening behavior, attributed to its large grain size and higher dislocation density arised from the presence of numerous fine particles and LPSO phases. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Tensile strength

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Effects of moirélattice distortion andπbond on the superlubricity of twist MoS_(2)/graphene and MoS_(2)/BN heterointerfaces

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Journal of materials Science & Technology 2024年第29期196卷 125-136页

作者： Peixuan Li William Yi Wang Xudong Sui Xiaoli Fan Jinshan Li State Key Laboratory of Solidification Processing School of Material Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Innovation Centre NPU ChongqingChongqing 401135China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of ScienceLanzhou 730000China Centre of Advanced Lubrication and Seal Materials Northwestern Polytechnical UniversityXi’an 710072China

Superlubricity,a novel lubricity mode ascribing to moirésuperlattice(MSL),has attracted attention in ultra-precise manufacture,microelectronic devices,and national defense *** on incommensurate MSL,nearly zero friction can be achieved by eliminating sliding lock-in and offsetting lateral force in principle,and the theoretical foundations are still under extensive ***,the effects of MSL-induced lattice distortion onπbond and tribological performance in twist MoS_(2)/graphene and MoS_(2)/BN heterointerfaces were studied by first-principles calculations *** contributions of 2pz orbital electron polarization among AA-,AB-,and AC-stacking symmetry areas in different MSL were reflected by band structures to explain the sensitivity ofπbond to ***πbond perpendicular to the atomic plane depended closely on interfacial distortion,which can not only influence the local distribution of intralayer bond strength but also determine the interlayer charge ***,the interfacial potential energy was changed with the interlayer interaction fluctuation caused by twist angle and atomic stacking *** evaluating the energy barriers and lateral force,MoS_(2)/BN with a twist angle of 20.79°exhibited ***,the connection among sliding energy barriers,twist angles,and specific electronic structures has been bridged paving a path to reveal the superlubricity mechanism of two-dimensional materials withπbond.

关键词： Moirésuperlattice Superlubricity DFT Band structure Heterointerfaces Two-dimensional materials

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Regulating energy storage performances of 0.85NaNbO_(3)-0.15Bi(Zn_(2/3)Nb_(1/3))O_(3) ceramics using BaTiO_(3)

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Journal of Materiomics 2022年第1期8卷 166-173页

作者： Dongyu Lai Zhonghua Yao Wei You Biao Gao Qinghu Guo Ping Lu Amjad Ullah Hua Hao Minghe Cao Hanxing Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and EngineeringWuhan University of TechnologyWuhan430070China International School of Material Science and Engineering Wuhan University of TechnologyWuhan430070China

Recently,NaNbO_(3)-based ceramics with excellent energy storage performances(ESPs)and fast chargedischarge characteristics have attracted great *** this case,BaTiO_(3) modified 0.85NaNbO_(3)-0.15Bi(Zn_(2/3)Nb_(1/3))O_(3)(0.85NN-0.15BZN-yBT)ceramics were designed and successfully fabricated using solid state *** discharge storage density of the ceramics increases from 1.22 J/cm^(3) at y=0-1.84 J/cm^(3) at y=8%,which is 1.5 times higher than pure 0.85NN-0.15BZN *** ceramic reveals excellent temperature stability up to 150℃,good discharge cycling after 10^(5) cycles and high discharge speed of 2.0μs,broadening the scope of NaNbO_(3)-based ceramics for energy storage applications.

关键词： Perovskites Ceramics Dielectric properties Energy storage Capacitors

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Tightened1D/3Dcarbonheterostructure infiltratingphase change materials for solar-thermoelectric energy harvesting:Faster and better

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Carbon Energy 2023年第6期5卷 104-117页

作者： Zhaodi Tang Piao Cheng Panpan Liu Yan Gao Xiao Chen Ge Wang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory of Function Materials for Molecule&Structure ConstructionSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingPR China Institute of Advanced Materials Beijing Normal UniversityBeijingPR China Aerospace Institute of Advanced Material and Processing Technology BeijingPR China Shunde Graduate School University of Science and Technology BeijingShundePR China

Extensive use of thermal energy in daily life is ideal for reducing carbon emissions to achieve carbon neutrality;however,the effective collection of thermal energy is a major ***(TE)conversion technology based on the Seebeck effect and thermal energy storage technology based on phase change materials(PCMs)represent smart,feasible,and research-worthy approaches to overcome this ***,the integration of multiple thermal energy sources freely existing in the environment for storage and output of thermal and electrical energy simultaneously still remains a huge ***,three-dimensional(3D)nanostructured metal-organic frameworks(MOFs)are in situ nucleated and grown onto carbon nanotubes(CNTs)via coordination *** calcination,the prepared core-shell structural CNTs@MOFs are transformed into tightened 1D/3D carbon heterostructure loading Co nanoparticles for efficient solar-thermoelectric energy ***,the corresponding composite PCMs show a record-breaking solar-thermal conversion efficiency of 98.1%due to the tightened carbon heterostructure and the local surface plasmon resonance effect of Co ***,our designed all-in-one composite PCMs are also capable of creating an electrical potential of 0.5 mV based on the Seebeck effect without a TE *** promising approach can store thermal and electrical energy simultaneously,providing a new direction in the design of advanced all-in-one multifunctional PCMs for thermal energy storage and utilization.

关键词： carbon neutrality metal-organic framework phase change materials solar-thermoelectric conversion thermal energy storage

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A Passive Sweat-Responsive Thermoregulatory Textile with the Largest Thermal Comfort Zone

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ACS Nano 2025年第21期19卷 19977-19988页

作者： Wang, Xueyang Du, Xiran Xu, Duo Wei, Tianqi Zhang, Qian Chen, Zipeng Kong, Desheng Wei, Kai Zhou, Lin Zhu, Bin Xu, Weilin Zhu, Jia National Laboratory of Solid State Microstructures College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional Materials Frontiers Science Center for Critical Earth Material Cycling Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China State Key Laboratory of New Textile Materials and Advanced Processing Wuhan Textile University Wuhan430200 China National Engineering Laboratory for Modern Silk College of Textile and Clothing Engineering Soochow University Suzhou215123 China

Maintaining the human body temperature within the thermally comfortable range under volatile temperatures and environments is critical from both the perspectives of human health and energy saving. Therefore, developing thermoregulatory textiles that have a large comfort zone in response to complex environmental temperature changes has been persistently pursued. Here, we demonstrate that a passive sweat-responsive thermoregulatory (PSRT) textile, composed of a unidirectional liquid-transported polycaprolactam (PA6)/metal bilayer, can tune mid-infrared (MIR) radiation and sweat evaporation simultaneously, thus achieving a substantial expansion of the thermal comfort zone in response to dynamic conditions. Specifically, for heating mode, the metalized bilayer PSRT textile intrinsically possesses low emissivity (ϵMIR ∼0.233) for excellent radiative heating. As the environmental temperature increases or during heavy exercise, sweat secretion by the skin increases rapidly, which triggers the autonomous switch to the cooling mode. Sweat rapidly transports to the top PA6 layer, facilitating rapid evaporation through the unidirectional liquid transport design;meanwhile, the PSRT textile automatically switches from low emissivity to high emissivity (ϵMIR ∼0.955) for radiative cooling. As a result, this PSRT textile expands the thermal comfort zone by 24.7 °C (8.3-33.0 °C), setting a performance record among passive thermoregulatory textiles. It is expected that the further advancement of the passive sweat-responsive thermoregulatory textile with an increasing thermal comfort zone can not only provide comfort for the human body with a minimized carbon footprint but also significantly expand the geographic and seasonal restrictions of human activity. © 2025 American Chemical Society.

关键词： Energy efficiency

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Fine grains with high-density annealing twins and precipitates inducing favorable strength and excellent plasticity in laser powder b e d fusion-fabricate d Inconel 718 via deep cryogenic and heat treatments

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Journal of materials Science & Technology 2024年第20期187卷 28-48页

作者： Bo Liu Jiayu Xu Yubi Gao Yong Hu Xiaokang Yang Yutian Ding Dong Zhang Sujun Lu State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Material Science and Engineering Lanzhou University of TechnologyLanzhou 730050China School of Electromechanics and Automobile Engineering Tianshui Normal UniversityTianshui 741001China Jinchuan Nickel Cobalt Research and Design Institute Jinchuan Group Co.LtdJinchang 737100China

Tailoring high-density annealing twins in laser powder bed fusion(LPBF)-fabricated alloys based on their intrinsic residual stress requires high annealing temperatures and/or long-term annealing,result-ing in the abnormal growth of large recrystallized grains,which is detrimental to mechanical *** work proposes a new strategy for achieving a favorable strength-plasticity synergy of the LPBF-fabricated Inconel 718 superalloy by performing a deep cryogenic treatment(DCT)with the subsequent heat treatment(including annealing and double aging)to tailor fine grains with“high-density annealing twins+precipitates”architectures and compares the obtained material with an alloy subjected to a direct heat treatment without a prior *** obtained results reveal that the additional internal stress gen-erated during DCT increases the stored energy and dislocation density,which provide a sufficient driving force for activating high-density annealing twin boundaries(63.2%)with fine grains(31.6μm)within a short annealing *** more homogeneous tailored microstructure with the“finer grains+high-density twins+precipitates”architectures decreases the mean free path of slipping dislocations,pro-moting intensive interactions with dislocations and inducing a strong strain hardening *** mul-tiple deformation modes of stacking faults coupled with Lomer-Cottrell locks,thin primary deformation twins,and secondary twins activated during tensile loading,sustaining a strong work hardening ability and delaying the plastic instability,which exhibits a high strength(yield strength of 1088 MPa and tensile strength of 1369 MPa)and excellent plasticity(elongation of 30%).This work not only describes a fea-sible method for simultaneously enhancing the strength and plasticity in additively manufactured(AM)alloys but also provides new insights into increasing the fraction of twins at a small grain size to improve the grain boundary-related properties without destroying the AM allo

关键词： Laser powder bed fusion Deep cryogenic treatment Stored energy High-density annealing twins Work hardening

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