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Effect of vacuum heat treatment on microstructure and corrosion behavior of HVOF sprayed AICoCrFeNiCu high entropy alloy

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Journal of Iron and Steel Research International 2023年第8期30卷 1550-1561页

作者： Yong-kuan Zhou l Jia-jie Kang Guo Jin Xiu-fang Cui Jie Zhang Guo-zheng Ma Zhi-qiang Fu Li-na Zhu Ding-shun She Yu-yun Yang School of Engineering and Technology China University of Geosciences(Beijing)Beijing 100083China School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100JiangsuChina Zhengzhou Institute China University of Geosciences(Beijing)Zhengzhou 451283HenanChina College of Material Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001HeilongjiangChina Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK National Key Lab for Remanufacturing Academy of Armored Forces EngineeringBeijing 100072China

To improve the corrosion resistance of coalbed methane drilling equipment,an AICoCrFeNiCu high entropy alloy coating was prepared on the AISI 4135(35CrMo)steel substrate by high velocity oxygen fuel(HVOF)technology,and the coating was subjected to vacuum heat treatment(VHT)at different temperatures(500,700,900 and 1100℃).The corrosion test of the substrate and the coatings after VHT in coalbed methane drilling fluid was carried *** results show that the HVOF sprayed AICoCrFeNiCu high entropy alloy(HEA)coating has a good bonding with the substrate,and the porosity of the coating is about 2.4%.There is partial segregation in the coating,and the coating mainly consists of body-centered cubic *** coating has good thermal stability,and the phase structure and microstructure of the coatings have changed after VHT at different *** with the substrate,the as-sprayed coating has better uniform corrosion resistance,and the corrosion resistance of the coating after VHT is further *** VHT at 500℃,the HVOF-sprayed AICoCrFeNiCu HEA coating has the best corrosion resistance.

关键词： High velocity oxygen fuel AICoCrFeNiCu high entropy alloy coating Vacuum heat treatment Microstructure Corrosion

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Oxidation-induced superelasticity in metallic glass nanotubes

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Nature materials 2024年第1期23卷 52-57页

作者： Li, Fucheng Zhang, Zhibo Liu, Huanrong Zhu, Wenqing Wang, Tianyu Park, Minhyuk Zhang, Jingyang Bönninghoff, Niklas Feng, Xiaobin Zhang, Hongti Luan, Junhua Wang, Jianguo Liu, Xiaodi Chang, Tinghao Chu, Jinn P. Lu, Yang Liu, Yanhui Guan, Pengfei Yang, Yong Department of Mechanical Engineering College of Engineering City University of Hong Kong Kowloon Tong Hong Kong Institute of Physics Chinese Academy of Sciences Beijing China Songshan Lake Materials Laboratory Dongguan China Beijing Computational Science Research Center Beijing China Department of Material Science and Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Materials Science and Engineering College of Engineering City University of Hong Kong Kowloon Tong Hong Kong College of Mechatronics and Control Engineering Shenzhen University Shenzhen China Department of Mechanical Engineering The University of Hong Kong Pok Fu Lam Hong Kong Department of System Engineering College of Engineering City University of Hong Kong Kowloon Tong Hong Kong

Although metallic nanostructures have been attracting tremendous research interest in nanoscience and nanotechnologies, it is known that environmental attacks, such as surface oxidation, can easily initiate cracking on the surface of metals, thus deteriorating their overall functional/structural properties 1–3. In sharp contrast, here we report that severely oxidized metallic glass nanotubes can attain an ultrahigh recoverable elastic strain of up to ~14% at room temperature, which outperform bulk metallic glasses, metallic glass nanowires and many other superelastic metals hitherto reported. Through in situ experiments and atomistic simulations, we reveal that the physical mechanisms underpinning the observed superelasticity can be attributed to the formation of a percolating oxide network in metallic glass nanotubes, which not only restricts atomic-scale plastic events during loading but also leads to the recovery of elastic rigidity on unloading. Our discovery implies that oxidation in low-dimensional metallic glasses can result in unique properties for applications in nanodevices. © 2023, The Author(s), under exclusive licence to Springer Nature Limited.

关键词： Metallic glass

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Grain-refining Co_(0.85)Se@CNT cathode catalyst with promoted Li_(2)O_(2)growth kinetics for lithium-oxygen batteries

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Chinese Chemical Letters 2024年第12期35卷 304-310页

作者： Ruonan Yang Jiajia Li Dongmei Zhang Xiuqi Zhang Xia Li Han Yu Zhanhu Guo Chuanxin Hou Gang Lian Feng Dang School of Materials Science&Engineering State Key Laboratory of Crystal MaterialsShandong UniversityJi’nan 250061China Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon TyneNE18STUnited Kingdom School of Environmental and Material Engineering Yantai UniversityYantai 264005China

Highly active cathode catalysts for efficient formation/decomposition of Li_(2)O_(2)are essential for the performance improvement of lithium-oxygen batteries(LOBs).In this study,a grain-refining Co_(0.85)Se catalyst with a lattice spacing of 2.69 A of(101)plane closely matching with the(100)plane(2.72A)of Li_(2)O_(2)was applied for high-performance ***(101)plane exposed Co_(0.85)Se@CNT was synthesized by a simple one-pot hydrothermal *** Co_(0.85)Se with the lattice matching effect not only led to the efficient conversion and polarized growth of Li_(2)O_(2),but also prevented the formation of *** functional theory(DFT)calculations reveal that Co_(0.85)Se(101)plane has the intrinsic catalytic ability to generate/decompose Li_(2)O_(2)during ORR/OER process,due to its homogeneous electron distribution,suitable adsorption energy,and promoted Li_(2)O_(2)growth *** a consequence,the(101)plane highly exposed Co_(0.85)Se@CNT-80 electrode exhibited remarkable cycle stability over 2400 h at 100 mA/g and 290cycles at 500 mA/g,which is about 2 times longer than other electrodes.

关键词： Lithium-oxygen batteries Co_(0.85)Se@CNT Cathode catalysts Grain-refiner DFT calculation

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Compact solar-powered plasma water generator: enhanced germination of aged seed with the corona dielectric barrierdischarger

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Frontiers of Agricultural science and engineering 2024年第4期11卷 642-651页

作者： Yiting XIAO Yang TIAN Haizheng XIONG Ainong SHI Jun ZHU Biological Engineering University of ArkansasFayettevilleAR 72701USA Program of Material Science and Engineering University of ArkansasFayettevilleAR 72701USA Department of Horticulture University of ArkansasFayettevilleAR 72701USA.

Seed aging adversely affects agricultural productivity by reducing germination rates and seedling vigor,leading to significant costs for seed banks and companies due to the need for frequent seed *** study demonstrated the use of plasma-activated water(PAW),generated by a solar-powered corona dielectric barrier discharger,to enhance germination rates of spinach seeds that had been stored at 4℃ for 23 *** seeds with PAW at 17 kV for 15 min improved germination(by 135%)and seedling growth compared to untreated *** detailed analysis,beneficial PAW properties for seed development were identified,and a molecular mechanism for this rejuvenation is *** solar-powered microreactor used in this study is considered to represent a significant advancement in seed treatment technology,offering a sustainable solution to meet growing food demands while addressing environmental and resource sustainability challenges.

关键词： Non-thermal plasma plant growth reactor design seedgermination

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Hyper-crosslinked Conjugated Microporous Polymers with Increased Micropores Promotes Confining Polymerization for Electromagnetic Absorption Application

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Chinese Journal of Polymer science 2023年第8期41卷 1305-1316,I0011页

作者： Hao Chen Fang-Yuan Chu Hai-Yan Zhuang Lu Wang Zhi-Min Ye Wei Dong Zhi-Peng Xie A-Ming Xie School of Mechanical Engineering Nanjing University of Science&TechnologyNanjing 210094China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research Institute(LSMRI)Xiamen 361100China School of Chemistry and Chemical Engineering Nanjing University of Science&TechnologyNanjing 210094China

Conjugated microporous polymers have excellent skeleton structures but poor electrical conductivity limits their applications in microwave *** solve this problem,a strategy of molecular expansion and confining polymerization is proposed in this work to synthesize conductive hyper-crosslinked conjugated microporous *** topology of the conjugated microporous polymer is changed into a three-dimensional skeleton structure with high specific surface area by using molecular expansion technique,and the controlled growth of polypyrrole in the channel constructs a unique network *** balance of excellent composite backbone structure,proper conductivity,attenuation capability and impedance matching enable the material to exhibit electromagnetic wave absorption *** a result,with low filler loading of 10 wt%,a strongest reflection loss of-52.68 d B and a maximum effective bandwidth of 5.76 ***,CST simulations of the radar scattering cross section have been carried out to verify the excellent material *** study provides new concepts for new conductive polymers and broadens the application of hyper-crosslinked conjugated microporous polymer in the field of electromagnetic wave absorption.

关键词： Hyper-crosslinked conjugated microporous polymer Electromagnetic wave absorbing Molecular expansion Polypyrrole

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Polaron interfacial entropy as a route to high thermoelectric performance in DAE-doped PEDOT:PSS films

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National science Review 2024年第3期11卷 259-270页

作者： Jiajia Zhang Caichao Ye Genwang Wei Liang Guo Yuhang Cai Zhi Li Xinzhi Wu Fangyi Sun Qikai Li Yupeng Wang Huan Li Yuchen Li Shuaihua Wang Wei Xu Xuefeng Guo Wenqing Zhang Weishu Liu Department of Materials Science and Engineering Southern University of Science and Technology Academy for Advanced Interdisciplinary Studies and Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology Department of Mechanical and Energy Engineering Southern University of Science and Technology Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences College of Chemistry and Molecular Engineering National Biomedical Imaging Centre Peking University Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and Technology

Enhancing the thermoelectric transport properties of conductive polymer materials has been a long-term challenge, in spite of the success seen with molecular doping strategies. However, the strong coupling between the thermopower and the electrical conductivity limits thermoelectric performance. Here, we use polaron interfacial occupied entropy engineering to break through this intercoupling for a PEDOT:PSS(poly（3,4-ethylenedioxythiophene）-poly（4-styrenesulfonate）) thin film by using photochromic diarylethene（DAE） dopants coupled with UV-light modulation. With a 10-fold enhancement of the thermopower from 13.5 μV K-1to 135.4 μV K-1and almost unchanged electrical conductivity, the DAE-doped PEDOT:PSS thin film achieved an extremely high power factor of 521.28 μW m-1K-2from an original value of 6.78 μW m-1K-2. The thermopower was positively correlated with the UV-light intensity but decreased with increasing temperature, indicating resonant coupling between the planar closed DAE molecule and PEDOT. Both the experiments and theoretical calculations consistently confirmed the formation of an interface state due to this resonant coupling. Interfacial entropy engineering of polarons could play a critical role in enhancing the thermoelectric performance of the organic film.

关键词： thermoelectric PEDOT: PSS interfacial occupied entropy resonant coupling UV-light modulation

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INCLUDING THERMOCHEMICAL EQUILIBRIUM CALCULATIONS INTO MULTIPHYSICS MODELS - A FINITE VOLUME BASED PHASE CHANGE MODEL 13

INCLUDING THERMOCHEMICAL EQUILIBRIUM CALCULATIONS INTO MULTI...

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13th South African Conference on Computational and Applied Mechanics, SACAM 2024

作者： Bogaers, Alfred E.J. Swanepoel, Jaco J. Roos, Willem A. Zietsman, Johan H. Ex Mente Technologies Pretoria South Africa Department of Mechanical Engineering and Aeronautical Engineering University of Pretoria South Africa Department of Material Science and Metallurgical Engineering University of Pretoria South Africa

ISBN: (纸本)9780797219144

In this paper we present two formulations of the energy equation which facilitates the direct coupling between computational fluid dynamics and computational thermochemistry, to simulate phase-change problems. The two formulations are designed to allow for treating the computational thermochemistry calculation step as a black-box operator, allowing for the methods described in this paper to be generically applicable to any computational thermochemistry tool. The energy equation formulations allow for stable and efficient, implicit in time, convergence behaviour. We present comparisons of the two energy equation formulations using two simple solid-liquid phase change test cases. Copyright 2024 by South African Association of Theoretical and Applied Mechanics. All rights reserved.

关键词： Computational fluid dynamics

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Electrocatalysis for sustainable nitrogen management: materials innovation for sensing, removal and upcycling technologies

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science China Chemistry 2025年第6期 2322-2342页

作者： Mei Yi Hongmei Li Minghao Xie Panpan Li Zhaoyu Jin Guihua Yu Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China College of Materials Science and Engineering and College of Chemistry Sichuan University Materials Science and Engineering Program and Walker Department of Mechanical Engineering The University of Texas at Austin

The global nitrogen cycle holds immense importance due to its crucial role in supporting life, supplying vital nutrients for plant growth, preserving environmental balance, and enabling the proper functioning of ecosystems. However, human activities frequently disrupt this cycle, leading to the accumulation of nitrates and nitrites in water bodies. This accumulation causes environmental pollution and health risks. Traditional methods for treating nitrogen pollution, including biological, physical, and chemical approaches, have inherent limitations. In recent years, electrocatalysis has emerged as a promising and sustainable approach for nitrogen management. This technology offers superior efficiency, high selectivity, and environmental *** not only enables accurate detection of nitrogen pollutants in the environment but also facilitates their conversion into harmless nitrogen gas. Moreover, recent advancements have focused on the upcycling of nitrogen pollutants into valuable compounds,such as ammonia and urea. In this comprehensive review, we showcase the applications of electrocatalysis in sustainable nitrogen management. Specifically, we highlight its use in the sensing, removal, and upcycling of major nitrogen pollutants,including nitrate（NO3-）, nitrite（NO2-）, and nitric oxide（NO）. We discuss the use of catalysts, such as Pd alloys, Cu-based, and Fe-based materials, in electrochemical sensing and catalysis. Additionally, we explore recent advancements in the conversion of nitrogen pollutants into valuable compounds like ammonia and urea. The review also addresses current challenges and future opportunities in the field, including innovations in sensor and catalyst design, as well as large-scale treatment strategies. We anticipate that these perspectives will provide profound insights for effective nitrogen pollution control and sustainable utilization of nitrogen resources.

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AllWeather-UsableWearable Dual Energy Harvester for Outdoor Sustainable Operation

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SusMat 2025年第1期5卷 159-170页

作者： Yeongju Jung Jiyong Ahn Ji-Seok Kim Junhyuk Bang Minwoo Kim Seongmin Jeong Jinwoo Lee Seonggeun Han Il-Kwon Oh Seung Hwan Ko Applied Nano and Thermal Science Lab Department of Mechanical EngineeringSeoul National UniversitySeoulRepublic of Korea National Creative Research Initiative for Functionally Antagonistic Nano-Engineering Department of Mechanical EngineeringSchool of Mechanical and Aerospace EngineeringKorea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea Department of Mechanical Roboticsand Energy EngineeringDongguk UniversitySeoulRepublic of Korea Device Solutions Research Samsung ElectronicsHwaseong-siRepublic of Korea Institute of Engineering Research/Institute of Advanced Machinery and Design(SNU-IAMD) Seoul National UniversitySeoulRepublic of Korea Interdisciplinary Program in Bioengineering Seoul National UniversitySeoulRepublic of Korea

Sustainable power sources for outdoor wearable electronics are essential for the continuous operation of wearable ***,the current lack of engineering design that can harvest energy regardless of weather conditions presents a significant *** this regard,this study introduces a wearable,breathable all-weather usable dual energy harvester(AWuDEH)that can seamlessly generate electrical energy regardless of weather *** this study,the AWuDEH integrated with the thermoelectric generator and the droplet-based electricity generator is *** AWuDEH,especially engineered with a bi-functional top substrate for radiative cooling and electrification,achieves sustainable energy harvesting outdoors,thereby addressing the conventional challenge associated with the necessity for separate energy harvesters tailored to outdoor usage contingent on weather *** device reaches a maximum power output of 14.6μW cm^(-2)under simulated sunny conditions and generates a much more enhanced thermoelectric power of 74.78μW cm^(-2)and a droplet-based electric power of 256.25 mW m^(-2)in rainy *** proof,this study developed self-powered wearable electronics capable of acquiring physiological signals in simulated outdoor *** study presents a promising advancement in wearable technology,offering a potent solution for sustainable energy harvesting independent of weather conditions.

关键词： all-weather usable droplet-based electricity generator hybrid architecture outdoor sustainable operation thermoelectric generator

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Tuning single-phase medium-entropy oxides derived from nanoporous NiCuCoMn alloy as a highly stable anode for Li-ion batteries

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Rare Metals 2023年第9期42卷 2982-2992页

作者： Zhen-Yang Yu Qi Sun Hao Li Zhi-Jun Qiao Wei-Jie Li Shu-Lei Chou Zhi-Jia Zhang Yong Jiang School of Mechanical Engineering Tiangong UniversityTianjin300387China State Key Laboratory for Powder Metallurgy Central South UniversityChangsha410083China School of Material Science and Engineering Tiangong UniversityTianjin300387China School of Electronic and Information Engineering Institute of Quantum Materials and DevicesTiangong UniversityTianjin300387China

Incorporating four cations into a single-phase oxide is beneficial for maintaining structural stability during Li+insertion/desertion because of the produced entropy-dominated phase stabilization effects. However,medium-entropy oxides exhibit inherently poor electron and ion conductivity. As such, in this work, a single-phase medium-entropy oxide of Ni_(x)Cu_(y)CozMn_(1-x-y-z)O(named as NCCM@oxides(H_(2))) is prepared by modified-NiCuCoMn alloy through the epitaxial-growing-based self-combustion and hydrogen reduction. During hydrogen reduction, some Cu ions are reduced to elemental Cu(defined as Cu^(0)),which is distributed among the metal oxides, while generating extensive oxygen vacancies around Cu. The synergetic effect between nanoporous metal-core oxide-shell structure and enriched oxygen/Cu^(0) vacancies greatly enhances the electronic/ionic conductivity. In addition, the lattice of single-phase quaternary metal oxides has the configuration entropy stability, which enables the rock-salt structure to remain stable during repeated conversion reactions. Benefiting from the above-mentioned merits, the anodeforLi-ionbatterieswithentropy-stabled NCCM@oxides(H_(2)) composite shows a high specific capacity of 699 mAh·g^(-1) at 0.1 A·g^(-1) and ultra-stable cycling stability, which maintains 618 and 489 mAh·g^(-1) at 0.1 and 1.0 A·g^(-1) after 200 cycles, respectively. This is the first use of this novel and simple strategy for modifying medium-entropy oxides, which paves the way for the development of high-entropy oxides as high-performance electrodes.

关键词： NiCuCoMn alloy Medium-entropy oxides Li-ion batteries Ultrahigh stability Mechanism

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