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Sequential hardening mechanisms in additive-manufactured NiTi shape memory alloys that can significantly delay compressive failure

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materials Today 2025年 87卷 36-48页

作者： Ma, Huwen Zhao, Yanchun Luo, Junhui Su, Yu Zheng, Tengfei Yu, Zhiqi Wu, Yuan Gao, Yanfei State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China School of Advanced Materials and Nanotechnology Xidian University Xian710071 China Department of Materials Science and Engineering University of Tennessee KnoxvilleTN37996 United States

Most material design strategies devoted to the strength-ductility synergy in tension are based on the delay of the necking instability. However, the counterpart investigations under compression remain elusive. Recent developments in simulating the failure process reveal that microscopic voids or cavities under compression/shear-dominated loadings will evolve sequentially as flattened to a micro-crack, rotating and elongating into kinks, and then interacting and coalescing with neighboring micro-cracks. This entire process can be significantly slowed down if the matrix material sustains a high work hardening exponent. Motivated by this novel micromechanical understanding, this work successfully realized hierarchically heterostructured microstructures in NiTi shape memory alloys (SMA) by using the selective laser melting (SLM) additive manufacturing technique. It is the sequential or progressive transition from the martensitic phase transformation, to heterogeneous deformation induced hardening, and then to amorphous lamellae hardening at later stage that sustains a high work hardening rate which results into an exceptionally high failure strain of the as-fabricated (without post-treatment) SMA under compression. The occurrence of amorphization at high strains is attributed to the high dislocation density and to the oxygen-assisted energy barrier reduction. This work thus offers an unprecedent design approach for the development of high performance SMAs. © 2025 Elsevier Ltd

关键词： Strain hardening

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Large‑scale Fabrication of Snake‑skin‑inspired Protective Composite Textiles

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advanced Fiber materials 2024年第4期6卷 978-992页

作者： Qing Liu Fengxiang Chen Tingting Dong Woong‑Ryeol Yu Chaoyu Chen Gaoming Jiang Zhijia Dong Pibo Ma Engineering Research Center of Knitting Technology Ministry of EducationCollege of Textile Science and EngineeringJiangnan UniversityWuxi 214122P.R.China State Key Laboratory of New Textile Materials and Advanced Processing Technologies/National Local Joint Laboratory for Advanced Textile Processing and Clean Production/Hubei Key Laboratory of Digital Textile Equipment Wuhan Textile UniversityWuhan 430200P.R.China Department of Materials Science and Engineering and Research Institute of Advanced Materials Seoul National UniversitySeoul 08826Republic of Korea

Inspired by the overlapping structure of snake scales,a reinforced scale-like knitted fabric(R-SLKF)was created in this *** achieve this,short carbon fibers in an epoxy resin(ER)matrix were incorporated into the scales of an *** resulting textile is a highly stable protective composite that is flexible,warm,and thermally *** addition,supe-rior stab-resistance is ensured through rigid protective blocks in the R-SLKF,making up a hard overlapping scale region,besides satisfactory flexibility via soft twisted ultra-high-molecular-weight polyethylene yarn-based *** R-SLKF achieves high stab resistance(peak load of approximately 600 N for a single scale thickness of 2 mm),good flexibility(~290 mN cm),and breathability(100 MPa,423 mm/s),coupled with good warmth retention and thermal insulation prop-erties(0.28℃/s),which are superior to previously reported protective composite *** the results,the combination of desirable individual protection,excellent wearability and comfort enables human beings to survive in extremely danger-ous *** element simulations provided valuable insights into the factors influencing the stab resistance of R-SLKF and elucidated the underlying anti-puncture mechanism in accordance with the experimental *** study presents a novel strategy for the facile industrial fabrication of flexible and lightweight protective composite textiles,which is expected to enhance the structure and material design for future innovations and provide advantages for personal protec-tive equipment in various industrial fields.

关键词： Scale-like knitted fabric Stab-resistance Flexibility Air permeability Warmth retention and thermal insulation properties

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Enhancing energy density of poly(vinylidene fluoride) composite film via addition of N-doped carbon modified boron nitride and sandwich-structural engineering

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Applied Surface Science 2023年第1期640卷

作者： Huang, Huabo Mei, Wentao Wang, Yucong Huang, Juan Li, Liang Ji, Jiayou Xiong, Chuanxi Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Key Laboratory for Green Chemical Process of Ministry of Education School of Materials Science and Engineering Wuhan Institute of Technology Wuhan430205 China Key Laboratory of Green Processing and Functional New Textile Materials of Ministry of Education School of Textile Science and Engineering Wuhan Textile University Wuhan430200 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

It is a challenge to simultaneously enhance dielectric constant and breakdown strength of dielectrics and achieve a greatly elevated energy density. Herein, polyaniline was first coated onto the surface of boron nitride nanosheets (BN), and then nitrogen-doped carbon (NC) was formed through a carburization process, resulting in BN@NC composite, which was subsequently added to poly(vinylidene fluoride) (PVDF) to prepare a composite film with high dielectric performance. The characterization showed that BN@NC effectively preserved the nanosheet structure of BN and formed strong hydrogen bonding interactions with the PVDF matrix, promoting the β-PVDF formation. This not only improved the compatibility but also enhanced the interfacial polarization between conductive NC and the polymer, leading to a high dielectric constant. Moreover, the electrically insulating BN prevented the formation of leakage current, resulting in a high breakdown strength. Finally, a sandwich-structured film was constructed, and exhibited a dielectric constant of 10.2 (at 1 kHz), a breakdown strength of 380 MV m−1, and an energy density of 6.1 J cm−3, which were 20%, 36%, and 74% higher, respectively, than those of pure PVDF film (8.5, 280 MV m−1, and 3.5 J cm−3). This work highlights significant potential for applications in low-cost and high-energy density dielectric composites. © 2023 Elsevier B.V.

关键词： Boron nitride

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Review of functionally graded materials processed by additive manufacturing

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China Welding 2023年第3期32卷 41-50页

作者：宋学平黄健康樊丁 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China School of Mechanical Engineering Lanzhou Petrochemical University of Vocational TechnologyLanzhou 730060China

Additive manufacturing(AM)technology makes parts through layer-by-layer deposition,which can regulate the microstructure and properties of different parts of a single part *** provides a new idea for the preparation of functionally gradient materials(FGM),and has become a research hotspot at *** referring to and analyzing the recent research achievements in the additive manufacturing tech-nology of FGM,the latest research progress at domestic and abroad from four aspects were summaried:selective laser melting additive man-ufacturing,electron beam additive manufacturing,arc additive manufacturing,path planning,and material ***,the existing problems in the research are pointed out,and the future research direction and focus are prospected.

关键词： functionally graded materials additive manufacture research progress

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原位渗硼激光熔覆FeCoCrNiMn涂层的摩擦学性能研究及其在齿轮修复中的应用

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表面工程与再制造 2024年第3期24卷 65-67页

作者： Dongya Zhang[a] Xiaoyu Suo[a] JinYuan Liu[a] Zhongwei Li[a] Yanchao Zhang[a] Hongxing Wu[b] Key Laboratory of Manufacturing Equipment of the Shaanxi Province School of Mechanical and Precision Instrument EngineeringXi'an University of TechnologyXi'anChina State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi'an710072China

高速重载的机械作业中,齿轮易发生点蚀、粘着和磨损,从而导致轮齿断裂和磨损失效。本文通过激光熔覆与渗硼集成的方式对失效齿轮进行修复实验,并对其摩擦学性能和修复后振动特性进行了系统研究。与母材相比,硼化物表面的平均硬度提高了8... 详细信息

高速重载的机械作业中,齿轮易发生点蚀、粘着和磨损,从而导致轮齿断裂和磨损失效。本文通过激光熔覆与渗硼集成的方式对失效齿轮进行修复实验,并对其摩擦学性能和修复后振动特性进行了系统研究。与母材相比,硼化物表面的平均硬度提高了8.37倍,耐磨性提高了15.60倍。

关键词：激光熔覆平均硬度渗硼硼化物机械作业摩擦学性能磨损失效高速重载

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Biomimetic brain-like nanostructures for solid polymer electrolytes with fast ion transport

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Science China materials 2022年第6期65卷 1476-1484页

作者： Ahmed Eissa Abdelmaoula Lulu Du Lin Xu Yu Cheng Amir AMahdy Muhammad Tahir Ziang Liu Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200China Mining and Metallurgical Department Faculty of EngineeringAl-Azhar UniversityCairo 11884Egypt

The intrinsic drawbacks of electrolytes and the growth of lithium dendrites limit the development of commercial lithium *** address the aforementioned challenges,a novel biomimetic brain-like nanostructure(BBLN)solid polymer electrolyte was created by manipulating the shape of the incorporated *** designed BBLN solid polymer electrolyte was created by incorporating spherical core-shell(UIO-66@67)fillers into polymer electrolyte,which is significantly different from traditional polymer-based composite ***-66@67 spherical nanoparticles are highly favorable to eliminating polymer electrolyte stress and deformation during solidification,indicating a great potential for fabricating highly uniform BBLN solid polymer electrolytes with a substantial number of continuous ***,spherical nanoparticles can significantly reduce the crystalline structure of polymer electrolytes,improving polymer chain segmental movement and providing continuous pathways for rapid ion *** a result,BBLN solid polymer electrolyte shows excellent ionic conductivity(9.2×10^(−4)S cm^(−1)),a high lithium transference number(0.74),and outstanding cycle stability against lithium electrodes over 6500 h at room *** concept of biomimetic brain-like nanostructures in this work demonstrates a novel strategy to enhance ion transport in polymerbased electrolytes for solid-state batteries.

关键词： brain structure spherical nanoparticles continuous interphase nanophase separation MOF-in-MOF

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High‑Energy and High‑Power Pseudocapacitor–Battery Hybrid Sodium‑Ion Capacitor with Na^(+) Intercalation Pseudocapacitance Anode

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Nano-Micro Letters 2021年第3期13卷 209-221页

作者： Qiulong Wei Qidong Li Yalong Jiang Yunlong Zhao Shuangshuang Tan Jun Dong Liqiang Mai Dong‑Liang Peng Department of Materials Science and Engineering Fujian Key Laboratory of Materials GenomeCollege of MaterialsXiamen UniversityXiamen 361005People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055People’s Republic of China Advanced Technology Institute University of SurreyGuildford Surrey GU27XHUK

High-performance and low-cost sodium-ion capacitors(SICs)show tremendous potential applications in public transport and grid energy ***,conventional SICs are limited by the low specific capacity,poor rate capability,and low initial coulombic efficiency(ICE)of anode ***,we report layered iron vanadate(Fe5V15O39(OH)9·9H2O)ultrathin nanosheets with a thickness of~2.2 nm(FeVO UNSs)as a novel anode for rapid and reversible sodium-ion *** to in situ synchrotron X-ray diffractions and electrochemical analysis,the storage mechanism of FeVO UNSs anode is Na+intercalation pseudocapacitance under a safe potential *** FeVO UNSs anode delivers high ICE(93.86%),high reversible capacity(292 mAh g^−1),excellent cycling stability,and remarkable rate ***,a pseudocapacitor–battery hybrid SIC(PBH-SIC)consisting of pseudocapacitor-type FeVO UNSs anode and battery-type Na3(VO)2(PO4)2F cathode is assembled with the elimination of presodiation *** PBH-SIC involves faradaic reaction on both cathode and anode materials,delivering a high energy density of 126 Wh kg^−1 at 91 W kg^−1,a high power density of 7.6 kW kg^−1 with an energy density of 43 Wh kg−1,and 9000 stable *** tunable vanadate materials with high-performance Na+intercalation pseudocapacitance provide a direction for developing next-generation highenergy capacitors.

关键词： Sodium-ion capacitors Pseudocapacitance Hybrid capacitors Two-dimensional materials Iron vanadate

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Atomically dispersed Zn-Co-N-C catalyst boosting efficient and robust oxygen reduction catalysis in acid via stabilizing Co-N bonds

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Fundamental Research 2023年第6期3卷 909-917页

作者： Feng Ma Xuan Liu Xiaoming Wang Jiashun Liang Jianyu Huang Cameron Priest Jinjia Liu Shuhong Jiao Tanyuan Wang Gang Wu Yunhui Huang Qing Li State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanHubei 430074China State Key Laboratory of Refractories and Metallurgy Institute of Advanced Materials and NanotechnologyKey Laboratory of Hubei Province for Coal Conversion and New Carbon MaterialsSchool of Chemistry and Chemical EngineeringWuhan University of Science and TechnologyWuhan 430081China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Department of Chemical and Biological Engineering University at BuffaloThe State University of New YorkBuffaloNY 14260United States State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China National Energy Center for Coal to Clean Fuels Synfuels China Co.LtdHuairou DistrictBeijing 101400China Department of Materials Science and Engineering Key Laboratory of Materials for Energy Conversion Chinese Academy of Science(CAS)University of Science and Technology of ChinaHefei 230026China Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province Shantou UniversityShantou 515063China

Transition metal supported N-doped carbon(M-N-C)catalysts for oxygen reduction reaction(ORR)are viewed as the promising candidate to replace Pt-group metal(PGM)for proton exchange membrane fuel cells(PEMFCs).However,the stability of M-N-C is extremely challenging due to the demetalation,H_(2)O_(2)attack,*** the strongly oxidative conditions of *** this study,we demonstrate the universal effect of Zn on promoting the stability of atomically dispersed M-Nx/C(M=Co,Fe,Mn)catalysts and the enhancement mechanism is unveiled for the first *** best-performing dual-metal-site Zn-Co-N-C catalyst exhibits a high half-wave potential(E1/2)value of 0.81 V *** hydrogen electrode(RHE)in acid and outstanding durability with no activity decay after 15,000 accelerated degradation test(ADT)cycles at 60℃,surpassing most reported Co-based PGM-free catalysts in acid *** comparison,the Co-N-C in the absence of Zn suffers from a rapid degradation after ADT due to the demetalation and higher H_(2)O_(2)yield.X-ray adsorption spectroscopy(XAS)and density functional theory(DFT)calculations suggest the more negative formation energy(by 1.2 eV)and increased charge transfer of Zn-Co dual-site structure compared to Co-N-C could strength the Co-N bonds against the demetalation and the optimized d-band center accounts for the improved ORR kinetics.

关键词： Electrocatalysis Oxygen reduction reaction Non-noble metal catalysts Metal-nitrogen carbon catalysts Demetalation Structural stability

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Recovering Platinum Black Nanoparticles via Photodeposition for Industrial Catalysis

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ACS Applied Nano materials 2025年第24期8卷 12548-12560页

作者： Zhan, Faqi Li, Ruixin Zhao, Haiyan Chen, Dalin Liu, Yisi La, Peiqing State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals School of Materials Science and Engineering Lanzhou University of Technology Lanzhou 730050 China State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization Jinchang 737100 China Institute of Advanced Materials Hubei Normal University Huangshi 415000 China

During the Cu or Ni smelting process, carbonylation slag is subjected to pressurized leaching. The resulting leachate typically contains low concentrations (3) was prepared by calcination as a photocatalyst to achieve... 详细信息

During the Cu or Ni smelting process, carbonylation slag is subjected to pressurized leaching. The resulting leachate typically contains low concentrations (<20 mg/L) of precious metals such as Pt and Au. Therefore, there is an urgent need to develop efficient methods for extracting these low-concentration precious metals. This article introduces an environmentally friendly method for recovering and preparing nanoplatinum black from a solution with a low concentration of Pt ions by using the photodeposition technique. The nano tungsten oxide (WO3) was prepared by calcination as a photocatalyst to achieve efficient recovery of Pt in a low-concentration precious metal Pt ion solution through ultraviolet (UV) irradiation. The study showed that the optimal experimental conditions were an ethanol concentration of 0.2 M, WO3 concentration of 0.5 g/L, and pH of 1.0, with a Pt reduction efficiency up to 99.75% after 20 min of illumination. The applicable range for Pt ion concentration is 0.01-10.0 mM. Further alkali leaching treatment yielded high-purity nano Pt black particles with an average particle size of 3.5 nm, a purity of 99.9%, and a total extraction efficiency of 96.75%. Under ultraviolet light, WO3 generated electrons captured by surface platinum ions. These ions were reduced to Pt nanoparticles, which deposited onto the WO3 surface. Nanoplatinum black was then separated by dissolving WO3 in alkaline conditions. This method is efficient, environmentally friendly, and nonpolluting, providing theoretical guidance and technical support for recovering and extracting Pt from low-concentration noble metal solution.

关键词： nano WO3 noble metals photodeposition Pt black recovery and extraction

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Interwoven Poly(Anthraquinonyl Sulfide)Nanosheets-Decorated Carbon Nanotubes as Core-Sheath Heteroarchitectured Cathodes for Polymer-Based Asymmetrical Full Batteries

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Energy & Environmental materials 2023年第5期6卷 468-476页

作者： Yonglin Wang Kai Chen Yunhai Zhu Jiazhi Wang Nan Jiang Yingkui Yang Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education&Hubei Key Laboratory of Catalysis and Materials Science South-Central Minzu UniversityWuhan 430074China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026China

Organic redox-active polymers provide promising alternatives to metal-containing inorganic compounds in Li-ion batteries(LIBs),whereas suffer from low actual capacities,poor rate/power capabilities,and inferior cycling ***,poly(anthraquinonyl sulfide)-coated carbon nanotubes(CNT@PAQS)are readily performed by in situ polymerization to form core-sheath ***,flower-like PAQS nanosheets are interwoven around CNTs to synergistically create robust 3D hierarchical networks with abundant cavities,internal channels,and sufficiently-exposed surfaces/edges,thereby promoting electron transport and making more active sites accessible for electrolytes and guest ***,the as-fabricated CNT@PAQS cathode delivers the large reversible capacity(200.5 mAh g^(-1)at 0.05 A g^(-1)),high-rate capability(161.5 mAh g^(-1)at 5.0 A g^(-1)),and impressive cycling stability(retaining 88.0%over 1000 cycles).In addition,an asymmetric full-battery using CNT@PAQS as a cathode and cyclized polyacrylonitrile-encapsulated CNTs as an anode is assembled that delivers a high energy density of 86.3 Wh kg^(-1),and retains 81.3%of initial capacity after 1000 *** work opens up an efficient strategy to combine highly conductive and redox-active phases into core-sheath heterostructures to unlock the barrier of high-rate charge *** further integration of two polymer-based electrodes into asymmetric full cells would also consolidate the development of low-cost,sustainable,and powerful batteries.

关键词： all-organic batteries core-sheath heterostructures lithium-ion batteries polymer electrode materials

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