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Effect of austenitizing condition on mechanical properties,microstructure and prec.p.tation behavior of AISI H13 steel

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Journal of Iron and Steel Research International 2024年第1期31卷 143-156页

作者： An-gang Ning Yang Liu Rui Gao Stephen yue Ming-bo Wang Han-jie Guo college of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024ShanxiChina Department of Mining and Materials Engineering McGill UniversityMontrealQCH3A 0C5Canada ASSAB Tooling Technology(chongqing)co. Ltd.Chongqing401120China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China

The effects of austenitizing temperature(1223,1303,and 1373 K)and holding time(1-1500 s)on the microstructure,mechanical properties,and prec.p.tation behavior of the H13 hot work die steel were *** results indicate a softening phenomenon when H13 steel is austenitized at 1303 K beyond 900 s and 1373 K beyond 600 s,*** the sample held for 1200 s,the tensile strength is found c.p.ble of reaching up to 2.2 Gpa when quenched from a temperature above 1303 ***,prior-austenite grain size increases with the increase in austenitizing *** kinetic behavior of the prec.p.tates(mainly Mc-type carbides)in H13 steel could be elaborated through the princ.p.es set forth by the Arrhenius and Avrami ***,the comprehensive strengthening of the H13 steel was discussed in *** results show that the activation energy of the transformed fraction of carbides is higher than that of the diffusion process for common alloying elements(cr,V,Mo,and Ni)found in the *** suggests that it would be difficult for prec.p.tates to dissolve into the matrix when H13 steel is austenitized at high *** the increasing austenitizing temperature,the prec.p.tation fraction decreases,and the dislocation density *** dislocation strengthening is regarded as the dominant strengthening contributed to yield strength in as-quenched H13 steel.

关键词： H13 steel Austenitizing Mechanical property prec.p.tation behavior comprehensive strengthening

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Metal-Organic Framework Enabling poly(Vinylidene Fluoride)-Based polymer Electrolyte for Dendrite-Free and Long-Lifespan Sodium Metal Batteries

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Energy & Environmental Materials 2024年第1期7卷 68-76页

作者： Yusi Lei Liang yue Yuruo Qi Yubin Niu Shujuan Bao Jie Song Maowen Xu Faculty of Materials and Energy Institute for Clean Energy&Advanced MaterialsSouthwest UniversityChongqing 400715China Shandong Zero-One-Four Advanced Materials co. Ltd.Feicheng 271099China

Sodium dentrite formed by uneven plating/stripping can reduce the utilization of active sodium with poor cyclic stability and,more importantly,cause internal short circuit and lead to thermal runaway and ***,sodium dendrites and their related problems seriously hinder the practical application of sodium metal batteries(SMBs).Herein,a design conc.p. for the incorporation of metal-organic framework(MOF)in polymer matrix(polyvinylidene fluoride-hexafluoropropylene)is practiced to prepare a novel gel polymer electrolyte(pH@MOF polymer-based electrolyte[GpE])and thus to achieve high-performance *** addition of the MOF particles can not only reduce the movement hindrance of polymer chains to promote the transfer of Na^(+)but also anchor anions by virtue of their negative charge to reduce polarization during electrochemical reaction.A stable cycling performance with tiny overpotential for over 800 h at a current density of 5 mA cm^(-2)with areal c.p.city of 5 mA h cm^(-2)is achieved by symmetric cells based on the resulted GpE while the Na_(3)V_(2)O_(2)(pO_(4))_(2)F@rGO(NVOpF)|pH@MOF|Nacell also displays impressive specific cycling c.p.city(113.3 mA h g^(-1)at 1 c)and rate c.p.bility with considerable c.p.city retention.

关键词： dendrite-free gel polymer electrolyte metal organic framework sodium batteries

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Dec.p.ering the controlling factors for phase transitions in zeolitic imidazolate frameworks

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National Science Review 2024年第4期11卷 151-163页

作者： Tao Du Shanwu Li Sudheer Ganisetti Mathieu Bauchy Yuanzheng yue Morten M.Smedskjaer Department of chemistry and Bioscience Aalborg University Department of Mechanical Engineering-Engineering Mechanics Michigan Technological University physics of Amo Rphous and Inorganic Solids Laboratory(pARISlab) Department of Civil and Environmental EngineeringUniversity of CaliforniaLos Angeles

Zeolitic imidazolate frameworks（ZIFs） feature complex phase transitions, including polymorphism,melting, vitrification, and polyamorphism. Experimentally probing their structural evolution during transitions involving amorphous phases is a significant challenge, especially at the medium-range length scale. To overcome this challenge, here we first train a deep learning-based force field to identify the structural characteristics of both crystalline and non-crystalline ZIF phases. This allows us to reproduce the structural evolution trend during the melting of crystals and formation of ZIF glasses at various length scales with an accuracy comparable to that of ab initio molecular dynamics, yet at a much lower computational cost. Based on this approach, we propose a new structural descriptor, namely, the ring orientation index, to c.p.ure the propensity for crystallization of ZIF-4(Zn（Im）2, Im = c3H3N2-) glasses, as well as for the formation of ZIF-zni(Zn（Im）2) out of the high-density amorphous phase. This crystal formation process is a result of the reorientation of imidazole rings by sacrificing the order of the structure around the zinc-centered tetrahedra. The outcomes of this work are useful for studying phase transitions in other metal-organic frameworks（MOFs） and may thus guide the development of MOF glasses.

关键词： metal-organic frameworks phase transitions melting glass formation transferable deep learning force field ring orientation

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Metastable face-centered cubic ruthenium-based binary alloy for efficient alkaline hydrogen oxidation electrocatalysis

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Journal of Energy chemistry 2024年第5期92卷 207-215页

作者： Yunbo Li Jianchao yue chaoyi Yang Hongnan Jia Hengjiang cong Wei Luo college of chemistry and Molecular Sciences Wuhan UniversityWuhan 430072HubeiChina

Metastable nanostructured electrocatalyst with a completely different surface environment compared to conventional phase-based electrocatalyst often shows distinctive catalytic *** Ru-based electrocatalysts have been widely investigated toward hydrogen oxidation reaction(HOR)under alkaline electrolytes,these studies are mostly limited to conventional hexagonal-close-packed(hcp)phase,mainly arising from the lack of sufficient synthesis *** this study,we report the precise synthesis of metastable binary RuW alloy with face-centered-cubic(fcc)*** find that the introduction of W can serve as fcc.p.ase seeds and reduce the formation energy of metastable fcc-RuW ***,fcc-RuW exhibits remarkable alkaline HOR performance and stability with the activity of 0.67 mA cm_(Ru)^(-2)which is almost five and three times higher than that of hcp-Ru and commercial pt/c,respectively,which is attributed to the optimized binding strength of adsorbed hydroxide intermediate derived from tailored electronic structure through W doping and phase ***,this strategy can also be applied to synthesize other metastable fcc-Rucr and fcc-RuMo alloys with enhanced HOR performances.

关键词： Hydrogen oxidation reaction Metastable phase Face-centered cubic(fcc) Ru phase engineering

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High-temperature oxidation resistance of Si-coated c/Sic composites

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Rare Metals 2024年第9期43卷 4566-4572页

作者： Jie Xiao Hua-yue Zhang Sheng-Kai Gong Hui-Bin Xu Hong-Bo Guo School of Materials Science and Engineering Beihang UniversityBeijing 100191China Key Laboratory of High-Temperature Structure Materials and protective coatings(Ministry of Industry and Information Technology) Beihang UniversityBeijing 100191China

In this paper,Si coatings were sprayed onto c/Sic composite substrates by atmospheric.p.asma spraying(ApS).The high-temperature oxidation behavior of the substrate and coating at temperatures of 1100 and 1300℃was also *** c/Sic ceramic matrix composite will be damaged seriously and even failed due to the oxidation of carbon fibers in *** Si coating effectively improved the oxidation resistance of the c/Sic substrate in the high-temperature oxidation *** effect of the thickness of the Si coatings on the oxidation resistance was *** 150-μm coating is proved to enable the substrate to have the lowest oxidation weight loss and the best oxidation resistance after static oxidation for 5 h.

关键词： ceramic matrix composites(cMcs) carbon fiber Si coating Oxidation plasma spray

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Synthesis of Anti-pancreatic cancer Natural product Majusculamide D and Analogues Reveals a preliminary Structure-Activity Relationships

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chinese Journal of chemistry 2024年第6期42卷 605-610页

作者： Xiuhe Zhao Mengxue Lv Xiaonan Xi Yaxin Lu Liang Wang yue chen The State Key Laboratory of Medicinal chemical Biology College of PharmacyNankai UniversityTianjin300350 China college of chemistry Nankai UniversityTianjin300071 China

The total synthesis of majusculamide D(1)was achieved from commercially available *** addition,we synthesized eight analogues including three stereoisomers of majusculamide D that differ in the fatty acid *** analogues including a simplified analogue 29 exhibited significant nanomolar-level Ic50 values against panc-1 cells in MTT assays.A preliminary SAR analysis indicated that the hydroxyl group at c10 and c2−c3 unsaturated double bond of majusculamide D were essential in maintaining the high activity against panc-1 cells and the orientation of c40-Me and c42-Me groups was tolerable.

关键词： Majusculamide D Natural products SAR Anti-pancreatic cancer Lipopentapeptide

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Multiple conductive network for KTi_(2)(pO_(4))_(3)anode based on MXene as a binder for high-performance potassium storage

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chinese chemical Letters 2024年第8期35卷 539-544页

作者： Tong Su yue Wang Qizhen Zhu Mengyao Xu Ning Qiao Bin Xu State Key Laboratory of Organic-Inorganic composites Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China

KTi_(2)(pO_(4))_(3)is a promising anode material for potassium storage,but suffers from low conductivity and difficult balance between high c.p.city and good structural ***,the Ti_(3)c_(2)T_(x)MXene is used as a multifunctional binder to fabricate the KTi_(2)(pO_(4))_(3)electrode by the traditional homogenizing-coating *** MXene nanosheets,together with the conductive agent super p nanoparticles,construct a multiple conductive network for fast electron/ion transfer and high electrochemical ***,the network ensures the structural stability of the KTi_(2)(pO_(4))_(3)electrode during the de-intercalation/intercalation of 4 K^(+)ions,which is beneficial for simultaneously achieving high c.p.city and good cycle ***,the MXene-bonded KTi_(2)(pO_(4))_(3)electrode delivers a reversible c.p.city of 255.2 mAh/g at 50 mA/g,outstanding rate c.p.bility with 132.3 mAh/g at 2 A/g,and ex-cellent cycle performance with 151.6 mAh/g at 1 A/g after 2000 *** work not only suggests a high-performance anode material for potassium-ion batteries,but also demonstrates that the MXene is a promising binder material for constructing conductive electrodes in rechargeable batteries.

关键词： MXene Ti_(3)c_(2)T_(x) KTi_(2)(pO_(4))_(3) Anode conductive network potassium storage

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cobalt-doped TiO_(2)@c hierarchical nanocomposites derived from Ti_(3)c_(2) MXene as cathodes for hybrid magnesium-lithium batteries

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Nano Research 2024年第1期17卷 253-261页

作者： Xiaohui Li Yakun Tang Lang Liu yue Zhang Yang Gao Mao Qian Wenjie Ma State Key Laboratory of chemistry and Utilization of carbon Based Energy Resources College of ChemistryXinjiang UniversityUrumqi 830017China

TiO_(2)has been explored in hybrid magnesium-lithium batteries(HMLBs)due to the advantages of low self-discharge and small volume expansion during ion ***,how to improve the inherently low ionic and electrical conductivity of TiO_(2)is the problem that needs to be *** this work,a smart strategy is adopted to prepare cobalt-doped TiO_(2)@c(co^(4+)-TiO_(2)@c)hierarchical nanocomposite derived from co(II)(OH)n@*** with TiO_(2)@c(without cobalt doping),co^(4+)-TiO_(2)@c shows the highest specific c.p.city(154.7 mAh·g^(-1)at 0.1 A·g^(-1)after 200 cycles)and extraordinary rate performance in *** excellent electrochemical performance of co4+-TiO_(2)@c is ascribed to the synergistic effect of the hierarchical structure and *** experimental results and density functional theory(DFT)calculation reveal that the cobalt-doping has effectively improved the electronic conductivity and reduced the Li+migration *** work provides a new insight to design TiO_(2)-based cathode materials with high-performance in HMLBs.

关键词： Ti_(3)c_(2)MXene TiO_(2) hybrid magnesium-lithium batteries hierarchical structure cobalt-doping

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Simulation of the Ecosystem productivity Responses to Aerosol Diffuse Radiation Fertilization Effects over the pan-Arctic during 2001–19

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Advances in Atmospheric Sciences 2024年第1期41卷 84-96页

作者： Zhiding ZHANG Xu yue Hao ZHOU Jun ZHU Yadong LEI chenguang TIAN Jiangsu Key Laboratory of Atmospheric Environment Monitoring and pollution control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science&Technology(NUIST)Nanjing 210044China climate change Research center Institute of Atmospheric Physics(IAP)Chinese Academy of Sciences(CAS)Beijing 100029China University of chinese Academy of Sciences Beijing 100049China State Key Laboratory of Severe Weather&Key Laboratory of Atmospheric chemistry of cMA Chinese Academy of Meteorological SciencesBeijing 100081China

The pan-Arctic is confronted with air pollution transported from lower *** have shown that aerosols help increase plant photosynthesis through the diffuse radiation fertilization effects(DRFEs).While such DRFEs have been explored at low to middle latitudes,the aerosol impacts on pan-Arctic ecosystems and the contributions by anthropogenic and natural emission sources remain less ***,we perform regional simulations at 0.2o×0.2ousing a well-validated vegetation model(Yale Interactive terrestrial Biosphere,YIBs)in combination with multi-source of observations to quantify the impacts of aerosol DRFEs on the net primary productivity(Npp)in the pan-Arctic during *** show that aerosol DRFEs increase pan-Arctic Npp by 2.19 pg c(12.8%)yr^(-1)under clear-sky conditions,in which natural and anthropogenic sources contribute to 8.9% and 3.9%,*** all-sky conditions,such DRFEs are largely dampened by cloud to only 0.26 pg c(1.24%)yr^(-1),with contributions of 0.65% by natural and 0.59% by anthropogenic *** aerosols cause a positive Npp trend of 0.022% yr^(-1)following the increased fire activities in the *** contrast,anthropogenic aerosols induce a negative trend of-0.01% yr^(-1)due to reduced emissions from the middle *** trends in aerosol DRFEs show a turning point in the year of 2007 with more positive Npp trends by natural aerosols but negative Npp trends by anthropogenic aerosols *** affected by modeling uncertainties,this study suggests a likely increasing impact of aerosols on terrestrial ecosystems in the pan-Arctic under global warming.

关键词： diffuse radiation fertilization effects anthropogenic aerosols natural aerosols pan-Arctic net primary productivity

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Growth kinetics of titanium carbide coating by molten salt synthesis process on graphite sheet surface

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1858-1864页

作者： Xiaoyu Shi chongxiao Guo Jiamiao Ni Songsong Yao Liqiang Wang yue Liu Tongxiang Fan State Key Lab of Metal Matrix composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The synthesis of carbide coatings on graphite substrates using molten salt synthesis(MSS),has garnered significant interest due to its cost-effective *** study investigates the reaction process and growth kinetics involved in MSS,shedding light on key aspects of the *** involvement of Ti powder through liquid-phase mass transfer is revealed,where the diffusion distance and quantity of Ti powder play a crucial role in determining the reaction rate by influencing the c content gradient on both sides of the ***,the growth kinetics of the carbide coating are predominantly governed by the diffusion behavior of c within the carbide layer,rather than the chemical reaction *** analyze the kinetics,the thickness of the carbide layer is measured with respect to heat treatment time and temperature,unveiling a parabolic relationship within the temperature range of 700-1300℃.The estimated activation energy for the reaction is determined to be 179283 J·mol^(-1).These findings offer valuable insights into the synthesis of carbide coatings via MSS,facilitating their optimization and enhancing our understanding of their growth mechanisms and properties for various applications.

关键词： titanium carbide graphite molten salt kinetic analysis

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