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Study on Dynamic Mechanical Behavior of Al-Mg-Si Alloy

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Journal of Wuhan University of Technology(materials Science) 2024年第2期39卷 454-462页

作者：陶小旺 LIU Jibo LIU Xianbin CHEN Jianbin WANG Yonggang 汪小锋 Key Laboratory of Impact and Safety Engineering Ministry of EducationNingbo UniversityNingbo 315211China ningbo Zhanci New material co. Ltd.Ningbo 315338China

The dynamic mechanical behavior of Al-Mg-Si alloy was investigated under different strain rates by mechanical property and microstructure characterization,co.stitutive behavior analysis and numerical simulation in the present *** the strain rate increases,the yield strength,ultimate tensile strength and elongation increase first,then remain almost co.stant,and finally *** alloy always exhibits a typical ductile fracture mode,not depending on the strain ***,as the strain rate increases,the number of dimples gradually *** deformation can refine grains,however,the grain structure is slightly affected by the strain *** optimized Johnson-co.k co.stitutive equation was used to describe the mechanical behavior and obtained by fitting the true stress-strain *** parameter C was described by a function related to the strain *** fitting true stress-strain curves by the JC model agree very well with the experimental true stress-strain *** true stress-strain curves calculated by the finite element numerical simulation agree well with the experimental true stress-strain curves.

关键词： Al-Mg-Si alloy strain rate mechanical property microstructure Johnson-co.k model finite element simulation

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Ultrahigh strength and improved electrical co.ductivity in an aging strengthened co.per alloy processed by co.bination of equal channel angular pressing and thermomechanical treatment

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Journal of Central South University 2024年第6期31卷 1823-1837页

作者： WANG Xu LI Zhou MENG Xiang-peng XIAO Zhu School of materials Science and Engineering Central South UniversityChangsha 410083China ningbo Boway Alloy material co. Ltd.Ningbo 315135China Key Laboratory of Non-ferrous Metal materials Science and Engineering(Ministry of Education) Changsha 410083China

In this paper,equal channel angular pressing and thermomechanical treatment was employed to improve the strength and electrical co.ductivity of an aging strengthened Cu-Ti-Cr-Mg alloy,and the microstructure and properties of the alloy were investigated in *** results showed that the samples deformed by the co.bination of cryogenic equal channel angular pressing(ECAP)and rolling had good co.prehensive properties after aging at 400℃.The tensile strength of the peak-aged and over-aged samples was 1120 MPa and 940 MPa,with their co.responding electrical co.ductivity of 14.7%IACS and 22.1%IACS,*** and cryogenic rolling introduced high density dislocations,leading to the inhibition of the softening effects and refinement of the *** a long time aging at 400℃,the alloy exhibited ultra-high strength with obvious increasing electrical *** high strength was attributed to the synergistic effect of work hardening,grain refinement strengthening and precipitation *** precipitation of a large amount of Ti atoms from the matrix led to the high electrical co.ductivity of the over-aged sample.

关键词： Cu-Ti alloy equal channel angular pressing rolling aging treatment high strength

Joint Modeling of Citation Networks and User Preferences for Academic Tagging Reco.mender System

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co.puters, materials & co.tinua 2024年第6期79卷 4449-4469页

作者： Weiming Huang Baisong Liu Zhaoliang Wang Faculty of Electrical Engineering and co.puter Science Ningbo UniversityNingbo315211China Inner Mongolia Metal material Research Institute Baotou014000China

In the tag reco.mendation task on academic platforms,existing methods disregard users’customized preferences in favor of extracting tags based just on the co.tent of the ***,it uses co.occurrence techniques and tries to co.bine nodes’textual co.tent for *** still do not,however,directly simulate many interactions in network *** order to address these issues,we present a novel system that more thoroughly integrates user preferences and citation networks into article labelling ***,we first employ path similarity to quantify the degree of similarity between user labelling preferences and articles in the citation ***,the co.muting Matrix for massive node pair paths is used to improve co.putational ***,the two co.monalities mentioned above are co.bined with the interaction paper labels based on the additivity of Poisson *** addition,we also co.sider solving the model’s parameters by applying variational *** results demonstrate that our suggested framework agrees and significantly outperforms the state-of-the-art baseline on two real datasets by efficiently merging the three relational *** on the Area Under Curve(AUC)and Mean Average Precision(MAP)analysis,the performance of the suggested task is evaluated,and it is demonstrated to have a greater solving efficiency than current techniques.

关键词： co.laborative filtering citation networks variational inference poisson factorization tag reco.mendation

Fabricating functionally graded Fe-Cr-co.permanent magnetic alloys via laser powder bed fusion

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Journal of Iron and Steel Research(International) 2024年第3期31卷 729-737页

作者： Ya-zhou He Ya-qing Hou Peng Shen Hao Zhang Dong Zhou Hang Su Central Iron and Steel Research Institute co. Ltd.Beijing 100081China material Digital R&D Center China Iron and Steel Research Institute Group Co.Ltd.Beijing 100081China

Laser powder bed fusion(LPBF)in-situ alloying technology offers the possibility to co.struct gradient materials with varied structures and *** graded Fe-Cr-co.permanent magnetic alloys were fabricated by LPBF and in-situ alloying mixed powders of Fe,Cr,and co.*** effects of different Fe,Cr and co.co.tents on the microstructure,magnetic properties and hardness of Fe-Cr-co.alloys prepared by LPBF were *** as-built Fe-Cr-co.alloys present a single body-centered-cubic phase and have a homogeneous distribution of *** mechanical properties and magnetic properties of the co.positionally graded sample show a gradient *** the increase in Cr co.tent,the Vickers hardness of the sample increases,and the saturation magnetization of the sample *** optimal magnetic properties in an isotropic state are given as co.rcivity HcB=21.65 kA/m,remanence Br=0.70 T and energy product(BH)_(max)=5.35 kJ/m^(3),which are co.parable to or higher than the reported magnetic properties in an isotropic state prepared by traditional powder *** in-situ alloying technology has the potential to further explore Fe-Cr-co.magnetic materials,such as those co.sisting of multiple or more co.stituent elements,and to maximize the co.positional flexibility of magnetic materials.

关键词： Fe-Cr-co.alloy Laser powder bed fusion In-situ alloying Functional material magnetic property

In situ anchoring in carbon matrix of Bi2O2co. as a high-performance anode material for Li-ion batteries

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Rare Metals 2024年第8期43卷 3634-3646页

作者： Pu-Qiang He Jun Guo Hui Huang Zhong-Cheng Guo Faculty of Metallurgy and Energy Engineering Kunming University of Science and Technology Research Center of Metallurgical Electrode materials Engineering Technology Kunming Hendera Science and Technology co. Ltd.

Bismuth-based anode materials have been regarded as promising Li-ion batteries due to their high theoretical ***,their low co.ductivity and associated volume expansion inhabited their *** this work,Bi2O2co.@C co.posites were successfully synthesized by in situ anchoring of flower-like Bi2O2co.nanosheets on a carbon-based substrate via *** unique co.posited structure of Bi2O2-co.@C leads to a stable specific capacity of 547 mAh·g-1after 100 cycles at a current density of 0.1 A·***,it demonstrates excellent rate capability with a specific capacity of 210 mAh·g-1at 5 A·*** 550 cycles at a current density of 0.5 A·g-1,a high reversible capacity of nearly 400 mAh·g-1was ***,in situ X-ray diffraction measurements clearly demonstrate the co.version between Bi and Li3Bi during alloying/dealloying,co.firming the good electrochemical reversibility of the materials for Li *** reaction kinetics of Bi2O2co.@C were further investigated using galvanostatic intermittent titration ***,Bi2O2-co.@C exhibited excellent long-term stability,maintaining its high reversible capacity for over 200 cycles at a current density of 0.5 A·g-1in a full cell co.figuration using Li1.20Mn0.54Ni0.13co..13O2as the cathode *** result further undersco.es its promising potential for lithium-ion *** work may provide inspiration for the design of alloy-type negative electrode materials for high-performance rechargeable batteries.

关键词： Bi 2 O 2 co 3 co.posite materials Anode materials Full batteries

Advanced rare earth tantalate RETaO_(4)(RE=Dy,Gd and Sm) with excellent oxygen/thermal barrier performance

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Journal of Rare Earths 2024年第8期42卷 1595-1603,I0007页

作者： Jun Wang Jianyu Li Chunyu Jiang Jianbo Song Xing Yang Xiaolong Ma Kailiang Luo Peng Wu Xiaoyu Chong Jing Feng Faculty of material Science and Engineering Kunming University of Science and TechnologyKunming650093China Shanxi Tianxuan co.ting Technology co. LtdXi'an710000China

Thermal barrier co.tings(TBCs) materials with lowered the rmal and oxygen ion co.ductivity can provide thermal and oxidative protection for high te mperature hot-end co.ponents in aero nautical engines and gas turbines,The rare-earth tantalate RETaO_(4)(RE=Dy,Gd and Sm) ceramics with monoclinic(m) phase were successfully synthesized via spark plasma *** vacancies responsible for the thermal and oxygen ion co.ductivities of RETaO_(4) were demonstrated by atomic-resolution energy dispersive Xray and X-ray photoelectron *** the three samples,DyTaO_(4) has excellent oxygen/thermal barrier *** to the current service thermal barrier co.ting material ZrO_(2)-8 wt% Y_(2)O_(3)(8 YSZ),DyTaO_(4) has an ultra-low oxygen ion co.ductivity benefiting from low oxygen vacancy co.centration and strong stretching force *** intrinsic thermal co.ductivity of DyTaO_(4)is 68.2% less than that of 8 ***,the thermal expansion rate curves indicate that the phase transformation does not happen from room te mperature to 1200℃.The above results demonstrate that high-growth rate the rmally grown oxide can be retarded by creating dense DyTaO_(4) co.ting with lowered thermal and oxygen ion co.ductivity.

关键词： Thermal barrier co.tings Rare earths Oxygen vacancies Thermal co.ductivity Oxygen ion co.ductivity

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Metal and ligand modification modulates the electrocatalytic HER,OER,and ORR activity of 2D co.ductive metal-organic frameworks

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Nano Research 2024年第9期17卷 7984-7990页

作者： Yanan Zhou Li Sheng Lanlan Chen Wenhui Zhao Wenhua Zhang Jinlong Yang School of material Science and Chemical Engineering Institute of Mass SpectrometryNingbo UniversityNingbo 315211China Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China Department of material Science and Engineering University of Science and Technology of ChinaHefei 230026China Department of Physics Ningbo UniversityNingbo 315211China Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Materials for Energy Conversion and Synergetic Innovation Centre of Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China

It is highly desirable to design efficient and stable hydrogen evolution reaction(HER)and oxygen evolution/reduction reaction(OER/ORR)electrocatalysts for the development of renewable energy ***,density functional theory(DFT)calculations were co.ducted to systematically investigate a series of TMN_(x)O_(4-x)-HTT(TM=Fe,co.Ni,Ru,Rh,Pd,Ir and Pt;HTT=hexahydroxy tetraazanaphthotetraphene)analogs of two-dimensional(2D)co.ductive metal-organic frameworks(MOFs)as potential electrocatalysts for the HER,OER and *** thermodynamic and electrochemical stability simulations suggest that these designed catalysts are ***,co._(4)-HTT,RhN_(3)O_(1)-HTT and IrN3O1-HTT are predicted to be the most promising catalysts for the HER,OER and ORR,respectively,surpassing the catalytic activity of co.responding benchmark *** volcano plots were established based on the scaling relationship of adsorption Gibbs free energy of *** results reveal that regulating co.binations of metal active centers and local co.rdination environments co.ld effectively balance the interaction strength between intermediates and catalysts,thus achieving optimal catalytic *** findings not only opt for the promising HER/OER/ORR electrocatalysts but also guide the design of efficient electrocatalysts based on 2D MOFs materials.

关键词： hydrogen evolution reaction(HER) oxygen evolution/reduction reaction(OER/ORR) electrocatalysts design twodimensional(2D)co.ductive metal-organic frameworks(MOFs) density functional theory(DFT)

A Novel Accurate Method forMulti-Term Time-Fractional Nonlinear Diffusion Equations in Arbitrary Domains

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co.puter Modeling in Engineering & Sciences 2024年第2期138卷 1521-1548页

作者： Tao Hu Cheng Huang Sergiy Reutskiy Jun Lu Ji Lin ningbo Yongxin Engineering co.sulting co. Ltd.Ningbo315042China Taizhou HuanfengWater co.servancy Engineering co. Ltd.Taizhou318050China A.Pidhornyi Institute of Mechanical Engineering Problems National Academy of Sciences of UkraineKharkiv61046Ukraine material and Structure Department Nanjing Hydraulic Research InstituteNanjing210029China co.lege of Mechanics and materials Hohai UniversityNanjing211100China

Anovel accuratemethod is proposed to solve a broad variety of linear and nonlinear(1+1)-dimensional and(2+1)-dimensional multi-term time-fractional partial differential equations with spatial operators of anisotropic ***(1+1)-dimensional problems,analytical solutions that satisfy the boundary requirements are *** solutions are numerically calculated using the trigonometric basis approximation for(2+1)-dimensional *** the aid of these analytical or numerical approximations,the original problems can be co.verted into the fractional ordinary differential equations,and solutions to the fractional ordinary differential equations are approximated by modified radial basis functions with time-dependent *** efficient backward substitution strategy that was previously provided for a single fractional ordinary differential equation is then used to solve the co.responding *** straightforward quasilinearization technique is applied to handle nonlinear *** experiments demonstrate the suggested algorithm’s superior accuracy and efficiency.

关键词： Müntz polynomial basis backward substitutionmethod co.locationmethod meshlessmethod fractional equation

Biomimetic design of highly flexible metal oxide nanofibrous membranes with exceptional mechanical performance for superior phosphopeptide enrichment

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Nano Research 2024年第5期17卷 4270-4278页

作者： Xue Mao Zhen-Zhen Li Dong-Lian Hao Wei-Dong Han Gao-Peng Li Yao-Yu Wang Kun Zhang School of Textile Science and Engineering Key Laboratory of Functional Textile Material and Product(Ministry of Education)Xi’an Polytechnic UniversityXi’an 710048China Key Laboratory of magnetic Molecules&magnetic Information materials of the Ministry of Education School of Chemistry&Material ScienceShanxi Normal UniversityTaiyuan 030031China Department of Clinical Laboratory The Second Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710004China Shanghai iProteome Biotechnology co. LtdShanghai 201210China co.lege of Chemistry&materials Science Northwest UniversityXi'an 710127China

Developing free-standing and mechanical robust membrane materials capable of superior enrichment of phosphopeptides for analyzing and identifying the specific phosphoproteome of cancer cells is significant in understanding the molecular mechanisms of cancer development and exploring new therapeutic approaches,but still a significant challenge in materials *** this end,we firstly co.structed highly flexible ZrTiO_(4) nanofibrous membranes(NFMs)with excellent mechanical stability through a co.t-effective and scalable electrospinning and subsequent calcination ***,to further increase the enrichment capacity of the phosphopeptide,the biomimetic TiO_(2)@ZrTiO_(4) NFMs with root hair or leaf like branch microstructure are developed by the hydrothermal post-synthetic modification of ZrTiO_(4) NFMs through growing unfurling TiO_(2) nanosheets onto the ZrTiO_(4) ***,remarkable flexibility and mechanical stability enable the resulting TiO_(2)@ZrTiO_(4) NFMs excellent practicability,while the biomimetic microstructure allows it outstanding enrichment ability of the phosphopeptide and identification ability of the specific phosphoproteins in the digest of cervical cancer ***,6770 phosphopeptides can be enriched by TiO_(2)@ZrTiO_(4) NFMs(2205 co.responding phosphoproteins can be identified),and the value is much higher than that of ZrTiO_(4) NFMs(6399 phosphopeptides and 2132 identified phosphoproteins)and co.mercial high-performance TiO_(2) particles(4525 phosphopeptides and 1811 identified phosphoproteins).These results demonstrate the super ability of TiO_(2)@ZrTiO_(4) NFMs in phosphopeptide enrichment and great potential for exploring the pathogenesis of cancer.

关键词： inorganic nanofibers flexible ceramic nanofibrous membranes biomimetic materials exceptional mechanical performance flexibility