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Melt viscosity of light alloys:Progress and challenges

Journal of Materials science & Technology 2024年第16期183卷 72-88页

作者： Yu Fu Hongxia Li Kai Tang Shenglan Yang Yue Shi Bin Liu Qun Luo Lijun Zhang Qian Li Fusheng Pan State Key Laboratory of Advanced Special Steel&School of Materials Science and Engineering&Shanghai Key Laboratory of Advanced Ferrometallurgy Shanghai UniversityShanghai 200444China SINTEF Industry N-7465TrondheimNorway National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China National Key Laboratory of Advanced Casting Technologies Chongqing UniversityChongqing 400044China

The viscosity of molten metals is a critical parameter influencing melt fluidity,alloy forming quality,and casting *** is therefore essential to maintain melt viscosity within an optimal range to enhance the fluidity and mold-filling capacity of molten ***,acquiring accurate data on liquid metal viscosity poses significant challenges due to the measurement difficulties and uncertainties in verifying the accuracy of theoretical calculations,hindering in-depth viscosity *** this review,a systematic introduction of experimental methods for viscosity measurement and theoretical models for viscosity prediction was first conducted,together with an analysis on the advantages/disadvantages of each method/***,all the experimental melt viscosities in unary,binary,ternary,and multi-component systems of light alloys especially aluminum alloys were summarized,and employed to verify the prediction accuracy of different theoretical models,ranging from physical,empirical,to geometrical ones.A comprehensive comparison between the predicted viscosities due to the theoretical model and the experimental data indicated that the CALPHAD approach and the machine learning method should be an effective strategy for predicting accurate viscosities in target alloy ***,the conclusions were drawn,and the future development directions for efficiently acquiring accurate viscosities in target alloy melts were also pointed out.

关键词： Viscosity Light alloys Alloy melt CALPHAD

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Sodium-ion conducting polymer electrolytes

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Rare Metals 2023年第1期42卷 1-16页

作者： Zhi-Yong Li Zhuo Li Jia-Long Fu Xin Guo State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China

Almost unlimited reserves and low cost of sodium are accelerating the commercialization of sodiumion ***,serious safety and stability issues,arising mainly from organic liquid electrolytes,hinder further developments of sodium-ion *** electrolytes might be a solution to the safety and stability issues due to the better safety of ***,an overview is provided on recent advances in polymer electrolytes for solid-state sodium batteries,including solid polymer electrolytes,composite polymer electrolytes and gel polymer *** properties,ionic conduction mechanisms and promising applications of polymer electrolytes are discussed,and pending challenges and effective solutions are ***,this review will promote commercial applications of polymer electrolytes in energy storage systems.

关键词： Polymer electrolyte Ionic conductivity Ionic conduction mechanism Sodium-ion battery(SIB) Solidstate battery(SSB)

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Effect of temperature on the mechanical properties of Ni-based superalloys via molecular dynamics and crystal plasticity

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Journal of Materials science & Technology 2024年第36期203卷 126-142页

作者： Y.-Z.Liu Z.-L.Shi Y.-B.Zhang M.Qin S.-P.Hu X.-G.Song W.Fu B.-J.Lee State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066000China Department of Materials Science and Engineering National University of SingaporeSingapore 117576Singapore Shandong Institute of Shipbuilding Technology Weihai 264209China Department of Materials Science and Engineering Pohang University of Science and TechnologyPohang 790784Korea

Study on the influence of temperature on the mechanical properties across multiple scales has been a focus on the research of Hastelloy-X(HX)alloys for the application in high-temperature structure *** this work,Molecular Dynamics(MD)and Crystal Plasticity(CP)are put together to solve it from atomic scale to mesoscopic *** research indicates that the deformation of HX alloy occurs in two stages at temperature below 300 K:initially,as stacking fault deforms,stacking fault can trans-form into twinning with increasing *** the temperature exceeds 300 K,deformation primarily forms a stacking *** twinning deformation path transforms from intrinsic stacking fault to extrin-sic stacking fault and then to twinning.A mesoscopic-scale CP model was developed using atomic-scale deformation mechanisms to bridge the gap between deformation mechanisms and experimental *** CP results indicate a functional relationship between the strength of HX alloy and *** relationship appears insensitive to crystal texture and grain *** grain morphology and texture into the model significantly impacts the strength response of calculating HX *** the ten-sile deformation of HX alloy at 300 and 1173 K,the atomic scale deformation results characterized by transmission electron microscopy are aligned with the MD simulation *** relationship between strength and temperature predicted by CP results has also been validated.A thorough investigation into the deformation behavior of HX alloys across different scales,employing MD and CP models,introduces a novel approach for predicting the mechanical properties of superalloys.

关键词： Molecular dynamics Twinning Superalloy High-temperature strength Crystal plasticity

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A general Boolean semantic modelling approach for complex and intelligent industrial systems in the framework of DES

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Journal of Systems engineering and Electronics 2024年第5期35卷 1219-1230页

作者： XU Changyi WANG Yun DUAN Yiman ZHANG Chao Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education School of Control Science and EngineeringDalian University of TechnologyDalian 116024China State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China

Discrete event system(DES)models promote system engineering,including system design,verification,and *** advancement in manufacturing technology has endowed us to fabricate complex industrial ***,the adoption of advanced modeling methodologies adept at handling complexity and scalability is ***,industrial systems are no longer quiescent,thus the intelligent operations of the systems should be dynamically specified in the *** this paper,the composition of the subsystem behaviors is studied to generate the complexity and scalability of the global system model,and a Boolean semantic specifying algorithm is proposed for generating dynamic intelligent operations in the *** traditional modeling approaches,the change or addition of specifications always necessitates the complete resubmission of the system model,a resource-consuming and error-prone *** with traditional approaches,our approach has three remarkable advantages:(i)an established Boolean semantic can be fitful for all kinds of systems;(ii)there is no need to resubmit the system model whenever there is a change or addition of the operations;(iii)multiple specifying tasks can be easily achieved by continuously adding a new ***,this general modeling approach has wide potential for future complex and intelligent industrial systems.

关键词： industrial complex system operation specifying Boolean semantic discrete event system(DES)theory intelligent operation

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Tailoring sintering-resistant thermal barrier coatings by considering critical healing width of two-dimensional interlamellar pores

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Journal of Advanced Ceramics 2023年第7期12卷 1317-1330页

作者： Guang-Rong Li Tao Liu Xiao-Tao Luo Guan-Jun Yang Chang-Jiu Li State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an 710049China

Large degradation in thermal insulation and strain tolerance is a main headache and a primary cause of the failure for plasma-sprayed thermal barrier coatings(TBCs)during *** mechanism behind such degradation is the healing of interlamellar pores formed by multiple connections between edges of a pore,which significantly speeds up healing during thermal *** objective of this study is to obtain sintering-resistant TBCs by tailoring the width of interlamellar pores to avoid multiple ***,the mechanism responsible for the multiple connections was *** splat surfaces before and after thermal treatments were characterized via an atomic force microscope(AFM).The roughening of the pore surface occurs during thermal exposure,along with the grain growth inside the ***,the local surface height increases,which causes multiple connections and healing of the interlamellar ***,critical widths of the interlamellar pores for avoiding the multiple connections during thermal exposure are established by correlating the extent of surface roughening with the growth of individual *** height increase of the splat surface and the growth of the grain size(D)were found to increase with the exposure temperature and duration.A relationship linking the height increase and the growth of the grain size induced by thermal exposure in plasma-sprayed ceramic splats was ***,composite TBCs were prepared to form wide interlamellar pores in the *** this design,the increases in the thermal conductivity(λ)and the elastic modulus(E)can be prevented to a large ***,sintering-resistant TBCs that maintain high thermal insulation and strain tolerance,even afer long thermal exposure,can be created.

关键词： thermal barrier coatings(TBCs) air plasma spraying(APS) multiple connections grain growth sintering-resistant structure

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Dendrimer-induced synthesis of porous organosilica capsules for enzyme encapsulation

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Frontiers of Chemical science and engineering 2024年第4期18卷 41-48页

作者： Ziyi Chu Boyu Zhang Zhenhua Wu Jiaxu Zhang Yiran Cheng Xueying Wang Jiafu Shi Zhongyi Jiang School of Environmental Science&Engineering Tianjin UniversityTianjin 300072China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Organic matter-induced mineralization is a green and versatile method for synthesizing hybrid nanostructured materials,where the material properties are mainly influenced by the species of natural biomolecules,linear synthetic polymer,or small molecules,limiting their ***,we adopted dendrimer poly(amidoamine)(PAMAM)as the inducer to synthesize organosilica-PAMAM network(OSPN)capsules for mannose isomerase(MIase)encapsulation based on a hard-templating *** structure of OSPN capsules can be precisely regulated by adjusting the molecular weight and concentration of PAMAM,thereby demonstrating a substantial impact on the kinetic behavior of the MIase@OSPN *** MIase@OSPN system was used for catalytic production of mannose from Dfructose.A mannose yield of 22.24% was obtained,which is higher than that of MIase in organosilica network capsules and similar to that of the free *** overall catalytic efficiency(kcat/Km)of the MIase@OSPN system for the substrate D-fructose was up to 0.556 s^(-1)·mmol^(-1)·***,the MIase@OSPN system showed excellent stability and recyclability,maintaining more than 50% of the yield even after 12 cycles.

关键词： enzyme immobilization enzyme catalysis organosilica networks capsules sugar biosynthesis

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Development and Regeneration Performance of LaNiO_(3)Perovskite Oxides for Dry Reforming of Methane

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Journal of Thermal science 2023年第5期32卷 1935-1944页

作者： CAO Dingshan LUO Cong CAI Guoqiu LUO Tong WU Fan LI Xiaoshan ZHENG Ying ZHANG Liqi State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Dry reforming of methane(DRM)process has attracted much attention in recent years for the direct conversion of CH_4 and CO_(2)into high-value-added *** key for DRM was to develop catalysts with high activity and *** this study,LaNiO_(3)was prepared by the sol-gel,co-precipitation,and hydro-thermal methods to explore the influence of preparation methods on the catalyst structure and DRM reaction *** regeneration properties of the used LaNiO_(3)catalysts were also investigated under steam,CO_(2),and air atmospheres,*** results showed that LaNiO_(3)prepared by sol-gel method showed the best DRM performance at 750℃.The DRM performance of the samples prepared by hydro-thermal method was inhibited at 750℃due to the residual of Na^(+)ions during the preparation *** regeneration tests showed that none of the three atmospheres could restore LaNiO_(3)perovskite phase in the samples,but they could eliminate the carbon deposits in the samples during the DRM reaction,so the samples could maintain stable DRM performance at different cycling stages.

关键词： dry reforming of methane perovskite LaNiO_(3) CO_(2)utilization thermal conversion

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Strain engineering of Pt-based electrocatalysts for oxygen reaction reduction

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Frontiers in Energy 2024年第2期18卷 241-262页

作者： Zeyu WANG Yanru LIU Shun CHEN Yun ZHENG Xiaogang FU Yan ZHANG Wanglei WANG State Key Laboratory of Solidification Processing Atomic Control and Catalysis Engineering LaboratorySchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration National Clinical Research Center for Oral DiseasesShaanxi Key Laboratory of StomatologyDepartment of Dental MaterialsSchool of StomatologyThe Fourth Military Medical UniversityXi’an 710032China Institute of New Energy Materials and Engineering School of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China Key Laboratory of Marine Chemistry Theory and Technology(Ministry of Education) College of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China

Proton exchange membrane fuel cells(PEMFCs)are playing irreplaceable roles in the construction of the future sustainable energy ***,the insufficient performance of platinum(Pt)-based electrocatalysts for oxygen reduction reaction(ORR)hinders the overall efficiency of *** the surface strain of catalysts is considered an effective way to tune their electronic structures and therefore optimize catalytic *** this paper,insights into strain engineering for improving Pt-based catalysts toward ORR are elaborated in ***,recent advances in understanding the strain effects on ORR catalysts are comprehensively ***,strain engineering methodologies for adjusting Ptbased catalysts are comprehensively ***,further information on the various challenges and potential prospects for strain modulation of Pt-based catalysts is provided.

关键词： strain engineering Pt-based catalysts oxygen reduction reaction(ORR) catalytic performance proton exchange membrane fuel cells(PEMFCs)

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Synthesis,crystallographic characterization,and potential application of fullerene anisole derivatives as nitrocellulose stabilizer

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Defence Technology（防务技术） 2023年第6期24卷 164-172页

作者： Jie Xiong Bo Jin Xue-mei Yu Ling Liao Ru-fang Peng State Key Laboratory of Environment-friendly Energy Materials School of Materials Science and EngineeringSouthwest University of Science and TechnologySichuanMianyang621010China

A series of fullerene anisole derivative stabilizers was synthesized by nucleophilic substitution reaction using hexachlorofullerene and benzyl alcohol as raw materials to extend the service duration of nitrocellulose(NC)-based ***-crystal X-ray diffraction,nuclear magnetic resonance,highresolution mass spectrometry,Fourier transform infrared(FT-IR)spectroscopy,and UV-Vis spectroscopy were used to characterize the structures of the synthesized fullerene anisole derivative *** violet,differential scanning calorimetry test,isothermal weight loss,vacuum stability test,and adiabatic accelerated test were used to study their compatibility with NC and their ability to stabilize *** results show that the designed and synthesized novel fullerene anisole derivative stabilizer has good compatibility with NC,and their overall stabilizing effects on NC are better than those of the traditional stabilizers,diphenylamine(DPA),and N,N’-dimethyl-N,N’-diphenylurea(C2).The stabilizing effects was ranked as:3b>2d>2a>2c>C2>2b>DPA>*** addition,FT-IR analysis and electron spin resonance spectroscopy were applied to explore the stability mechanism of fullerene-based stabilizers to *** results reveal that the new fullerene stabilizer can adsorb and effectively eliminate the nitrogen oxide free radicals generated by NC degradation;therefore,it can forbid the autocatalytic degradation of NC and stabilize NC.

关键词： Fullerene Nitrocellulose Stability Propellant Mechanism

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Low-power consumption anisotropic CMOS inverters based on n-ReS_(2)and p-WSe_(2)

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Nano Research 2025年第3期18卷 502-509页

作者： Ting Fu Shuai Liu Baoxin Niu Wanfu Shen Chunguang Hu Ruixuan Peng Kai Liu Chengbao Jiang Shengxue Yang School of Materials Science and Engineering Beihang UniversityBeijing 102206China State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin 300072China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

The surge in data volume and algorithmic complexity necessitates the development of highly integrated,low-power,and high-performance electronic *** complementary metal-oxide-semiconductor(CMOS)inverters,which rely solely on isotropic two-dimensional materials,encounter limitations due to their single voltage output,thereby impeding the miniaturization of integrated *** this study,we introduce anisotropic CMOS inverters based on n-ReS_(2)and p-WSe_(2),which demonstrate distinct voltage transfer characteristics across various crystalline *** inverters exhibit the lowest voltage gain along the a-axis of ReS_(2)flakes,whereas they possess the highest voltage gain and the lowest static power consumption along the *** optimizing the gate dielectric on substrates,the inverter achieves an enhanced voltage gain of 30.8 and an ultra-low power consumption of 5.4 pW along the b-axis direction,when fabricated on a 35 nm Al_(2)O_(3)substrate deposited via atomic layer deposition(ALD)***,it captures a clear dynamic switching behavior at a supply voltage of 3 V under a 20 Hz square wave input *** study proposes a potential approach to circuit miniaturization by leveraging anisotropic two-dimensional materials for the integration of diverse voltage transfer characteristics within a single logic device,thereby achieving a combination of low power consumption and high-density integration.

关键词： anisotropic CMOS inverters two-dimensional materials voltage gain low power consumption

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