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EBSd parameter assessment and constitutive models of crept Hr3C austenitic steel

Journal of Iron and Steel research International 2023年第4期30卷 772-781页

作者： Jie Zhang Zheng-fei Hu Zhen Zhang Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials School of Materials Science and EngineeringTongji UniversityShanghai 201804China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167JiangsuChina

Creep damage and evolution of Hr3C steel at 650℃ were investigated using electron backscatter diffraction(EBSd),and EBSd-based parameter assessments were *** analyses show that the grain size is almost unchanged and no obvious texture formed after creep at different creep *** lowest proportion of low Σ coincidence site lattice grain boundaries under 150 MPa implies that the primary twin structures are preserved under the low stress level,while some twin structures evolved into general grain boundaries at the high creep *** main damage features of microcracks and cavities can be seen along the grain boundaries:the former emerged at higher stress levels,while the latter appeared at the lower stress level,and both were shown under medium *** contrast shows that the most severe creep damage is present at 170 *** implies that the creep mechanism differs distinctly under different stress levels,and the transition point is around 170 *** average misorientation is better to describe the local plastic deformation related to the strain distribution while grain reference orientation deviation describes the inhomogeneous strain *** lifetime prediction models including the isothermal method,Larson-Miller parameter method and Monkman–Grant relation were evaluated by the experimental data and literature data,and they are valid for predicting creep behavior.

关键词： Austenitic heat-resistant steel Creep damage Electron backscatter diffraction Creep constitutive model Creep lifetime prediction

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Built-in electric field induced by defected carbons adjacent to graphitic nitrogen valley for efficient oxygen reduction reaction and zinc-air batteries

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Journal of Energy Chemistry 2025年第4期103卷 813-825页

作者： Na Li Tingting Ma Huihui Wang Jiayi Li dingrong Qiu Zhen Meng Jiangdu Huang Lijun Sui Faming Han Huidan Lu Yongping Liu Sundaram Chandrasekaran Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional MaterialsCollege of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004GuangxiChina Guangxi Colleges and Universities Key Laboratory of Surface and Interface Electrochemistry College of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004GuangxiChina Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials Institute of New Energy for VehiclesSchool of Materials Science and EngineeringTongji UniversityShanghai 201804China

rational design of defected carbons adjacent to nitrogen(N)dopants is a fascinating but challenging approach for enhancing the catalytic performance of N-doped ***,the combined effect of heteroatom doping and defect engineering can efficiently increase the oxygen reduction reaction(Orr)ability of inactive carbons through charge ***,we report that an enhanced built-in electric field caused by the combined effect of N-doping and carbon defects in the twodimensional(2d)mesoporous N-doped carbon nano flakes(NCNF)is a promising technique for improving Orr *** a result,the NCNF exhibits more promising Orr activity than Pt/C and similar performance with reported robust *** experimental and theoretical investigations suggest that topologically defected carbon adjacent to the graphitic valley nitrogen is a real active site,rendering optimal energy for the adsorption of Orr intermediates and lowering the total energy barrier for ***,NCNF-based Zn-air batteries exhibited an excellent power density and specific capacity of~121.10 mW cm^(-2)and~679.86 mA h g_(Zn)^(-1),*** study not only offers new insights into defected carbons with graphitic valley N for Orr but also proposes novel catalyst design principles and provides a solid grasp of the built-in electric field effect on the Orr performance of defective catalysts.

关键词： defective carbon Built-in electric field Graphitic valley nitrogen-doped carbon defects Oxygen reduction reaction Zn-air batteries

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Inhibiting Voltage decay in Li-rich Layered Oxide Cathode:From O3-Type to O2-Type Structural design

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Nano-Micro Letters 2024年第12期16卷 81-102页

作者： Guohua Zhang Xiaohui Wen Yuheng Gao renyuan Zhang Yunhui Huang Institute of New Energy for Vehicles Shanghai Key Laboratory for R&D and Application of Metallic Functional MaterialsSchool of Materials Science and EngineeringTongji UniversityShanghai 201804People’s Republic of China Contemporary Amperex Technology Co. LtdNingde 352100People’s Republic of China State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiPeople’s Republic of China

Li-rich layered oxide(LrLO)cathodes have been regarded as promising candidates for next-generation Li-ion batteries due to their exceptionally high energy density,which combines cationic and anionic redox ***,continuous voltage decay during cycling remains the primary obstacle for practical applications,which has yet to be fundamentally *** is widely acknowledged that voltage decay originates from the irreversible migration of transition metal ions,which usually further exacerbates structural evolution and aggravates the irreversible oxygen redox ***,constructing O2-type structure has been considered one of the most promising approaches for inhibiting voltage *** this review,the relationship between voltage decay and structural evolution is systematically *** to suppress voltage decay are systematically ***,the design of O2-type structure and the corresponding mechanism of suppressing voltage decay are comprehensively ***,the reported O2-type LrLO cathodes still exhibit partially disordered structure with extended ***,the factors that may cause the irreversible transition metal migrations in O2-type LrLO materials are also explored,while the perspectives and challenges for designing high-performance O2-type LrLO cathodes without voltage decay are proposed.

关键词： Lithium-ion batteries Li-rich layered oxide Voltage decay Migration of transition metal ions O2-type structural design

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Mutual Self‑regulation of d‑Electrons of Single Atoms and Adjacent Nanoparticles for Bifunctional Oxygen Electrocatalysis and rechargeable Zinc‑Air Batteries

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Nano-Micro Letters 2023年第4期15卷 40-57页

作者： Sundaram Chandrasekaran rong Hu Lei Yao Lijun Sui Yongping Liu Amor Abdelkader Yongliang Li Xiangzhong ren Libo deng College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China College of Chemistry and Bioengineering Guilin University of TechnologyGuilin 541004People’s Republic of China Shenzhen Key Laboratory of Special Functional Materials Shenzhen Engineering Laboratory for Advanced Technology of CeramicsCollege of Materials Science and EngineeringGuangdong Research Center for Interfacial Engineering of Functional MaterialsShenzhen UniversityShenzhen 518060People’s Republic of China Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials Institute of New Energy for VehiclesSchool of Materials Science and EngineeringTongji UniversityShanghai 201804People’s Republic of China Department of Design and Engineering Faculty of Science&TechnologyBournemouth UniversityPoole BH125BBDorsetUK

rechargeable zinc-air batteries(ZABs)are a promising energy conversion device,which rely critically on electrocatalysts to accelerate their rate-determining reactions such as oxygen reduction(Orr)and oxygen evolution reactions(OEr).Herein,we fabricate a range of bifunctional M-N-C(metal-nitrogen-carbon)catalysts containing M-Nx coordination sites and M/MxC nanoparticles(M=Co,Fe,and Cu)using a new class ofγ-cyclodextrin(Cd)based metal-organic framework as the *** the two types of active sites interacting with each other in the catalysts,the obtained Fe@C-FeNC and Co@C-CoNC display superior alkaline Orr activity in terms of low half-wave(E1/2)potential(~0.917 and 0.906 V,respectively),which are higher than Cu@C-CuNC(~0.829 V)and the commercial Pt/C(~0.861 V).As a bifunctional electrocatalyst,the Co@C-CoNC exhibits the best performance,showing a bifunctional Orr/OEr overpotential(ΔE)of~0.732 V,which is much lower than that of Fe@C-FeNC(~0.831 V)and Cu@C-CuNC(~1.411 V),as well as most of the robust bifunctional electrocatalysts reported to *** X-ray absorption spectroscopy and density functional theory simulations reveal that the strong electronic correlation between metallic Co nanoparticles and the atomic Co-N4 sites in the Co@C-CoNC catalyst can increase the d-electron density near the Fermi level and thus effectively optimize the adsorption/desorption of intermediates in Orr/OEr,resulting in an enhanced bifunctional electrocatalytic *** Co@C-CoNC-based rechargeable ZAB exhibited a maximum power density of 162.80 mW cm^(−2) at 270.30 mA cm^(−2),higher than the combination of commercial Pt/C+ruO2(~158.90 mW cm^(−2) at 265.80 mA cm^(−2))*** the galvanostatic discharge at 10 mA cm^(−2),the ZAB delivered an almost stable discharge voltage of 1.2 V for~140 h,signifying the virtue of excellent bifunctional Orr/OEr electrocatalytic activity.

关键词： Cyclodextrin Cd-MOF Single-atom catalyst Orr/OEr Zinc-air battery

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Fully carbonate-electrolyte-based high-energy-density Li–S batteries with solid-phase conversion

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Carbon Energy 2024年第11期6卷 14-26页

作者： Takashi Hakari Yuto Kameoka Kaihei Kishida Shinji Ozaki Chihiro Murata Minako deguchi ryo Harada Tomoki Fujisawa Yusuke Mizuno Heisuke Nishikawa Tomoyuki Tamura Yiqun Wang Hikari Takahara Takashi Aoki Tokuo Inamasu daisuke Okuda Masashi Ishikawa Department of Chemistry and Materials Engineering Faculty of ChemistryMaterials and BioengineeringKansai UniversitySuitaOsakaJ apan R&D Center GS Yuasa International Ltd.Minami-kuKyotoJapan Department of Physical Science and Engineering Nagoya Institute of TechnologyNagoyaAichiJapan Application Laboratory X-ray Product DivisionRigaku CorporationTakatsukiOsakaJapan

Carbonate-electrolyte-based lithium–sulfur(Li–S)batteries with solid-phase conversion offer promising safety and scalability,but their reversible capacities are *** addition,large-format pouch cells are paving the way for large-scale *** study demonstrates the in situ formation of a solid-electrolyte interphase(SEI)as a protective layer using vinylene carbonate(VC),highlighting its industrial adaptability.A high reversible capacity is achieved by the lithiated poly-VC SEI formed inside the cathode particles as a nanoscale ionic conduction path,along with the traditional surface protective ***,the severe dissolution of poly-VC is mitigated by LiF derived from fluorine ethylene carbonate as a co-solvent,enabling high rate performance and a long cycle life.A large 8 Ah pouch cell is successfully developed,which shows a high energy density of 400 Wh kg^(−1) based on the cell *** work demonstrates the high performance of large-scale Li–S batteries with the in situ formation of a protective layer as a scalable technique for future applications.

关键词： lithium-sulfur batteries pouch cells solid-electrolyte interphase

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Using multiple regression analysis to predict directionally solidified TiAl mechanical property

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Journal of materials Science & technology 2022年第9期104卷 285-291页

作者： Seungmi Kwak Jaehwang Kim Hongsheng ding Xuesong Xu ruirun Chen Jingjie Guo Hengzhi Fu National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Carbon Materials Application R&D Group Korea Institute of Industrial TechnologyJeonju 54853 Republic of Korea

The mechanical properties of TiAl alloy prepared by directional solidification were predicted through a machine learning algorithm *** composition,input power,and pulling speed were designated as input variables as representative factors influencing mechanical properties,and multiple linear regression analysis was conducted by collecting data obtained from the *** this study,the r^(2)value of the tensile strength prediction result was 0.7159,elongation was 0.8459,nanoindentation hardness was 0.7573,and interlamellar spacing was *** the r^(2)value of the elongation obtained through the analysis was higher than the r^(2)value of the tensile strength,it was confirmed that the elongation had a closer relationship with the input variables(composition,input power,pulling speed)than the tensile *** adding the elongation to the tensile strength as an input variable,it was observed that the r^(2)value was further *** tensile test prediction results were divided into four groups:The group with the lowest residual value(predicted value-actual value)was designated as group A,and the group with the largest residual value was designated as group *** comparing the values of group A and group d,more overpredictions occurred in group A,while more under predictions occurred in group *** the residuals and r^(2)values,the cause of the well-prediction was studied,and through this,the relationship between the mechanical properties and the microstructure was quantitatively investigated.

关键词： directionally solidified TiAl alloy Microstructure control Tensile strength Interlamellar space Prediction Multiple linear regression

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Fluorophosphates and fluorosulfates cathode materials: Progress towards high energy density sodium-ion battery

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Nano research 2024年第3期17卷 1427-1440页

作者： Mohammed Hadouchi Jingrong Hou Toshinari Koketsu Abdelilah Lahmar Jiwei Ma Laboratoire de Chimie Appliquée des Matériaux Centre des Sciences des MatériauxFaculty of ScienceMohammed V University in RabatAvenue Ibn BattoutaBP 1014RabatMorocco Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials Institute of New Energy for VehiclesSchool of Materials Science and EngineeringTongji UniversityShanghai 201804China Battery Materials Development Section Business Creation Sector R&D CenterMitsui Mining&Smelting Co.Ltd.362-0021 SaitamaJapan Laboratoiry of Condensed Matter Physics University of Picardie Jules Verne33 Rue Saint-Leu 80039AmiensFrance

The rapid diffusion of renewable energy boosts the wide deployment of large-scale energy storage *** the low cost and high crustal abundance,sodium-ion battery(SIB)technology is expected to become a dominant technology in that area in the *** the practical application,novel cathode materials are urged to develop that show high energy density without sacrificing their cost and benignity to the *** the years of many studies,this still remains a huge challenge to battery *** this review,we discuss recent breakthroughs in SIB cathode materials with high energy density,namely fluorphosphates and *** design of materials,the crystal structure,the electrochemical performance,and the underlaying intercalation mechanism are systematically *** strategies and research directions are also provided to advance future high-energy,low-cost,and ecofriendly cathode materials for next generation SIB.

关键词： fluorophosphates fluorosulfates crystal structure intercalation mechanism high energy density sodium-ion battery

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recovery of rare earth elements and thorium from acid leaching residue of ionic rare earth concentrates

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Journal of rare Earths 2025年第4期43卷 794-804,I0006页

作者： Qiaofa Lan Xiaolin Zhang Fei Niu donghui Liu Leiting Shen Youming Yang Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China National Engineering Research Center for Ionic Rare Earth Ganzhou341000China School of Metallurgy and Environment Central South UniversityChangsha410083China Guangdong Provincial Key Lab of R&D for Resource Utilization and Disposal of Hazardous Liquids Shenzhen518057China School of Rare Earth and New Materials Engineering Gannan University of Science and TechnologyGanzhou341000China Key Laboratory of Development and Application of Ionic Rare Earth Resources(Jiangxi University of Science and Technology) Ministry of EducationGanzhou341000China

The acid leaching residue(ALr)of ionic rare earth(IrE)concentrates containing radioactive elements such as thorium(Th)is classified as low-level radioactive *** holds valuable strategic resources such as rare earth and Th,while improper long-term heaping storage of ALr poses a substantial environmental *** paper proposes a comprehensive process involving low-temperature roasting,hydrochloric acid leaching,single extractant enrichment,and stepwise stripping to recover rare earth elements and thorium from *** achieved leaching efficiencies are 80.11%of LnY,99.43%of Sc(Ⅲ),and 98.67%of Th(Ⅳ)after the carbonization of the organic phase in the ALr through low-temperature *** large amounts of acid and impurities present in the leachate,2-ethylhexyl phosphonic acid mono 2-ethylhexyl ester(HEHEHP)still exhibits nearly 100%extraction efficiency for Sc(Ⅲ)and Th(Ⅳ).The effective separation of LnY,Th(Ⅳ),and Sc(Ⅲ)was achieved by implementing fractional extraction enrichment of Th(Ⅳ)and Sc(Ⅲ),followed by Th(Ⅳ)removal through H_(2)SO_(4)and Sc(Ⅲ)removal via NaOH from the loaded organic *** scheme successfully achieves a recovery of rE and Th and offers a viable solution for the safe disposal of ALr.

关键词： Low-level radioactive waste rare earths Thorium Solvent extraction resource recovery

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Microstructure and mechanical properties of Fe/NbC composite layer prepared by in-situ reaction

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China Foundry 2023年第4期20卷 356-364页

作者： Le Chen Ji-lin Li Meng-jun Wang Jie Zheng Yao Zhu Zhuo-lin Liu Bing-gui Lü School of Materials Science and Engineering Central South UniversityChangsha 410083China School of Materials Science and Engineering Xi'an University of TechnologyXi'an 710048China Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application Guangzhou 510650China Guangdong Guangyun New Material Co. Ltd.Yunfu 527527GuangdongChina Yunfu Guangyun Technology R&D Co. Ltd.Yunfu 527527GuangdongChina

NbC ceramic surface-reinforced steel matrix composites were prepared by an in-situ reaction method at different temperatures(1,050℃,1,100℃and 1,150℃)for different times(1 h,2 h and 3 h).The phase constitution,microstructure and fracture morphology of NbC ceramic surface-reinforced steel matrix composites were analyzed by Xrd,SEM and EdS,and the effects of the in-situ reaction temperature and time on the mechanical properties were systematically *** results indicate that the NbC reinforcement layer is formed through the reaction between Nb atoms and carbon atoms diffused from the steel matrix to the Nb *** thickness of this reinforcement layer increases as the reaction time ***,an increase in reaction temperature results in a thicker reinforcement layer,although the rate of increase gradually *** relationship among the thickness of the Nb C reinforcement layer,the reaction time and temperature was established by data *** optimal tensile performance is achieved at 1,100℃for 1 h,with a tensile strength of 228 *** is also found that the defects between the reinforcement layer and the steel matrix are related to reaction *** 1,100℃,these defects are *** mostly occurs in the NbC reinforced layer of the composites,and the fracture mode is characterized by typical intergranular brittle fracture.

关键词： in-situ reaction NbC reinforcement layer microstructure mechanical property

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Mechanical densification synthesis of single-crystalline Ni-rich cathode for high-energy lithium-ion batteries

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Journal of Energy Chemistry 2023年第4期79卷 562-568页

作者： Gwonsik Nam Jaeseong Hwang donghun Kang Sieon Oh Sujong Chae Moonsu Yoon Minseong Ko Division of Convergence Materials Engineering Pukyong National UniversityBusan 48547Republic of Korea Namyang R&D Center Hyundai Motor CompanyHwaseong 18280Republic of Korea Division of Industrial Chemistry and Polymer Engineering Pukyong National UniversityBusan 48547Republic of Korea Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA

The intergranular microcracking in polycrystalline Ni-rich cathode particle is led by anisotropic volume change and stress corrosion along grain boundary,accelerating battery performance ***,we have suggested a simple but advanced solid-state method that ensures both uniform transition metal distribution and single-crystalline morphology for Ni-rich cathode synthesis without sophisticated ***-assisted mechanical densification(PAMd)process on solid-state precursor mixture enables the dynamic mass transfer through the increased solid-solid contact area which facilitates the grain growth during sintering process,readily forming micro-sized single-crystalline ***,the improved chemical reactivity by a combination of capillary effect and vacancyassisted diffusion provides homogeneous element distribution within each primary *** a result,single-crystalline Ni-rich cathode with PAMd process has eliminated a potential evolution of intergranular cracking,thus achieving superior energy retention capability of 85%over 150 cycles compared to polycrystalline Ni-rich particle even after high-pressure calendering process(corresponding to electrode density of~3.6 g cm^(-3))and high cut-off voltage *** work provides a concrete perspective on developing facile synthetic route of micron-sized single-crystalline Ni-rich cathode materials for high energy density lithium-ion batteries(LIBs).

关键词： Lithium-ion batteries Ni-rich cathode materials Mechanical densification Solid-state synthesis

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