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Diffusion mechanism of immiscible Fe-Mg system induced by high-density defects at the steel/Mg composite interface

Journal of materials science & Technology 2023年第13期144卷 150-160页

作者： Yanlan Sun Xuefeng Liu Wenjing Wang Yaohua Yang Weiliang Zhang Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China Key Laboratory for Advanced Materials Processing of Ministry of Education University of Science and Technology BeijingBeijing 100083China

Due to positive mixing heat between Fe and Mg,it is difficult to diffuse for Fe-Mg at the interface of steel/Mg laminated composites,resulting in the inability to achieve high-strength metallurgical *** this paper,20#steel/Mg laminated composites were prepared by large deformation rolling and subse-quent diffusion heat treatment *** interfacial bonding strength was improved by constructing high-density crystal defects at the interface to promote element *** mechanisms of interface morphology evolution and element diffusion were analyzed by finite element simulation and theoretical *** results show after diffusion heat treatment,the bond strength of the large deformation rolled interface was increased from 14 to 30 ***-Mg transition layer with about 80 nm thickness as well as high-density vacancies,dislocations and grain boundaries were formed in the large deforma-tion rolled interface *** diffusion heat treatment,Mg elements diffused into grain interior and grain boundary regions of 20#steel under the effect of heat-force coupling,and the thickness of Fe-Mg transition layer increased to 150 nm,forming an Fe-based supersaturated solid *** in-terface with high-density defects constituted a non-equilibrium *** 20#steel internal energy in the non-equilibrium interface is able to overcome positive mixing heat of immiscible Fe-Mg system and provide the driving force for Mg elements *** elemental diffusion by constructing high-density defects can be a new concept to achieve metallurgical bonding at the interface of immiscible metal laminated composites.

关键词： Steel/Mg composite interface Immiscible Fe-Mg system Non-equilibrium interface Diffusion mechanism

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Doping suppresses lattice distortion of vacant quadruple perovskites to activate self-trapped excitons emission

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Nano Research 2024年第4期17卷 3068-3078页

作者： Zhipeng Chen Fei Zhang Dongwen Yang Huifang Ji Xu Chen Di Wu Xinjian Li Yu Zhang Zhifeng Shi Key Laboratory of Materials Physics of Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China

The vacancy-ordered quadruple perovskite Cs_(4)CdBi_(2)Cl_(12),as a newly-emerging lead-free perovskite system,has attracted great research interest due to its excellent stability and direct band ***,the poor luminescence performance limits its application in light-emitting diodes(LEDs)and other ***,for the first time,an Ag^(+)ion doping strategy was proposed to greatly improve the emission performance of Cs_(4)CdBi_(2)Cl_(12) synthesized by hydrothermal *** functional theory calculations combined with experimental results evidence that the weak orange emission from Cs_(4)CdBi_(2)Cl_(12) is attributed to the phonon scattering and energy level crossing due to the large lattice distortion under excited ***,Ag^(+)ion doping breaks the intrinsic crystal field environment of Cs_(4)CdBi_(2)Cl_(12),suppresses the crossover between ground and excited states,and reduces the energy loss in the form of nonradiative *** a critical doping amount of 0.8%,the emission intensity of Cs_(4)CdBi_(2)Cl_(12):Ag^(+)reaches the maximum,about eight times that of the pristine ***,the doped Cs_(4)CdBi_(2)Cl_(12) still maintains excellent stability against heat,ultraviolet irradiation,and environmental oxygen/*** above advantages make it possible for this material to be used as solid-state phosphors for white LEDs applications,and the Commission International de I’Eclairage color coordinates of(0.31,0.34)and high color rendering index of 90.6 were *** importantly,the white LED demonstrates remarkable operation stability in air ambient,showing almost no emission decay after a long working time for 48 *** believe that this study puts forward an effective ion-doping strategy for emission enhancement of vacancy-ordered quadruple perovskite Cs_(4)CdBi_(2)Cl_(12),highlighting its great potential as efficient emitter compatible for practical applications.

关键词： Cs_(4)CdBi_(2)Cl_(12) self-trapped excitons ion doping emission enhancement stability

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Cyclic oxidation behavior of electron beam physical vapor deposition NiAlHf and NiAlHfCrSi coatings at 1150℃

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Rare Metals 2023年第4期42卷 1408-1413页

作者： Si-Jia Liang Hong-Hai Song Lei Zheng Hong-Bo Guo School of Materials Science and Engineering Beihang UniversityBeijing100191China Key Laboratory of Aerospace Materials and Performance(Ministry of Education) Beihang UniversityBeijing100191China

NiAlHf and NiAlHfCrSi coatings were deposited by electron beam physical vapor deposition(EBPVD).The grain size and orientation of NiAlHf and NiAlHfCrSi coatings were determined by electron backscatter diffraction(EBSD).The NiAlHf coating reveals a more uniform grain size compared to NiAlHfCrSi coating,while the NiAlHfCrSi coating shows a<111>preferential orientation which is parallel to the normal direction of the surface of the *** cyclic oxidation behavior of NiAlHf and NiAlHfCrSi coatings at 1150℃was *** to NiAlHf coating,the NiAlHfCrSi coating shows improved resistance to cyclic oxidation and scale *** effect of grain size and orientation on the cyclic oxidation behavior of NiAlHf and NiAlHfCrSi coatings were investigated at 1150℃.

关键词： Rare earth elements Thermal cycling Coatings Grain size Orientation

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Electron delocalization-enhanced sulfur reduction kinetics on an MXene-derived heterostructured electrocatalyst

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Nano Research 2024年第8期17卷 7153-7162页

作者： Yunmeng Li Yinze Zuo Xiang Li Yongzheng Zhang Cheng Ma Xiaomin Cheng Jian Wang Jitong Wang Hongzhen Lin Licheng Ling State Key Laboratory of Chemical Engineering Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education)East China University of Science and TechnologyShanghai 200237China Institute of New Energy Materials and Engineering College of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education) School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China i-Lab&CAS Key Laboratory of Nanophotonic Materials and Device Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215123China Helmholtz Institute Ulm(HIU) D89081 UlmGermany

Lithium-sulfur(Li-S)batteries mainly rely on the reversible electrochemical reaction of between lithium ions(Li^(+))and sulfur species to achieve energy storage and conversion,therefore,increasing the number of free Li^(+)and improving the Li^(+)diffusion kinetics will effectively enhance the cell ***,Mo-based MXene heterostructure(MoS_(2)@Mo_(2)C)was developed by partial vulcanization of Mo_(2)C MXene,in which the introduction of similar valence S into Mo-based MXene(Mo_(2)C)can create an electron delocalization *** theoretical simulations and electrochemical characterisation,it is demonstrated that the MoS_(2)@Mo_(2)C heterojunction can effectively promote ion desolvation,increase the amount of free Li^(+),and accelerate Li^(+)transport for more efficient polysulfide *** addition,the MoS_(2)@Mo_(2)C material is also capable of accelerating the oxidation and reduction of polysulfides through its sufficient defects and vacancies to further enhance the catalytic ***,the Li-S battery with the designed MoS_(2)@Mo_(2)C electrocatalyst performed for 500 cycles at 1 C and still maintained the ideal capacity(664.7 mAh·g^(−1)),and excellent rate performance(567.6 mAh·g^(−1)at 5 C).Under the extreme conditions of high loading,the cell maintained an excellent capacity of 775.6 mAh·g^(−1)after 100 *** also retained 838.4 mAh·g^(−1)for 70 cycles at a low temperature of 0℃,and demonstrated a low decay rate(0.063%).These results indicate that the delocalized electrons effectively accelerate the catalytic conversion of lithium polysulfide,which is more practical for enhancing the behaviour of Li-S batteries.

关键词： delocalized electron lithium sulfur batteries MXene-based heterostructures catalytic desolvation multi-catalytic sites

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Concurrent toughening and hardening in AgMgNi alloys by internal oxidation

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Rare Metals 2024年第12期43卷 6625-6638页

作者： Bing-Rui Liu Hai-Cheng Zhu Shao-Hong Liu Li-Min Zhou Hao Cui Man-Men Liu Li Chen Ming Wen Hai-Gang Dong Feng Liu Wei Wang Song Li Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang110819China State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals Yunnan Precious Metals Laboratory Co.LtdKunming650106China Sino-Platinum Metals Semiconductor Materials(Yunnan)Co. LtdKunming650106China

Enhancing the ductility of internally oxidized AgMg alloys has posed a longstanding challenge.A new method to achieve simultaneous hardening and toughening of AgMgNi alloys is presented by means of internal *** influence of Ni content on the internal oxidation process and the mechanical behavior of AgMgNi alloys is systematically *** is found that Ni addition induces grain refinement by forming nanoscale Ni particles,which act as heterogeneous nucleation sites and inhibit grain growth during internal *** enhances the plasticity and toughness of the alloys via the Hall-Petch *** alloys exhibit a conductivity of~42 MS·m^(-1)and surface hardness of~HV125,which are insensitive to the variation of Ni content within 0 wt%-2 wt%.The optimal range of Ni content for achieving the best combination of hardness,strength and toughness is0.15 wt%-0.3 wt%,corresponding to alloys with a tensile strength above 300 MPa and a toughness surpassing3300 MJ·m^(-3).Higher Ni contents reduce the internal oxidation depth(from about 340.6 to about 238.4μm)and the tensile strength(from about 342.1 to about 230.1 MPa)of the alloys by generating micrometer-sized Ni-rich particles in the matrix,which consume oxygen,obstruct some of the oxygen diffusion channels and impede the oxidation front *** non-oxidized region,which does not benefit from oxidation strengthening,diminishes the overall strength of the *** results reveal the crucial role of Ni in regulating the internal oxidation dynamics and microstructure evolution of AgMgNi alloys,and suggest a novel approach for designing high-performance alloys with concurrent hardening and toughening.

关键词： Hardening Toughening Internal oxidation AgMgNi alloy Grain refinement

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Chloride Corrosion of Reinforced Calcium Aluminate Cement Mortar

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Journal of Wuhan University of Technology(materials science) 2023年第1期38卷 79-87页

作者：陈钰婷吴凯徐玲琳 WANG Zhongping ZHAO Yating ZHU Zheyu Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education School of Materials Science and EngineeringTongji UniversityShanghai 201804China Henan Provincial Communications Planning&Design Institute Co. LtdZhengzhou 450052China

This paper describes a study on the corrosion behavior of steel reinforcement in CAC mortars via electrochemical methods including corrosion potential,electrochemical impedance,and linear polarization *** indicate that there is a non-linear relationship between the corrosion degree of steel reinforcement in CAC mortar and the concentration of NaCl *** electrochemical parameters of specimens immersed in 3%NaCl solution suddenly drop at 40 days,earlier than 60 days of the *** the charge transfer resistivity of the specimen has decreased by 11 orders of magnitude at 40 days,showing an evident corrosion on steel ***,it is interesting to notice that the corrosion is delayed by high external chloride *** specimens immersed in 9%and 15%NaCl solutions remain in a relatively stable state within 120 days with slight *** great corrosion protection of CAC concrete to embedded steel bars enables its wide application in marine.

关键词： electrochemical impedance calcium aluminate cement mortar chloride corrosion

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Bio-inspired barnacle cement coating of biodegradable magnesium alloy for cerebrovascular application

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Rare Metals 2024年第10期43卷 5164-5185页

作者： Hang Li Fei Wang Xiao-Jing Sun Liu-Jie Qi Jing-An Li Mujahid Iqbal Shao-Kang Guan School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450000China Henan Key Laboratory of Advanced Magnesium Alloy&Key Laboratory of Materials Processing and Mold(Ministry of Education) Zhengzhou UniversityZhengzhou 450000China Department of Physics University of Agriculture FaisalabadFaisalabad 38000Pakistan

Ischemic stroke is increasing worldwide,and stent intervention has gradually become one of the effective *** to its good mechanical properties and biocompatibility,biodegradable Mg-Zn-Y-Nd alloy(ZE21B)has good application prospects in vascular ***,too fast degradation and delayed endothelialization are the bottleneck problem to limit its further *** this study,the bio-inspired coating barnacle cement cp19k is constructed on ZE21B surface through electrostatic spraying to improve the corrosion resistance and pro-endothelialization *** coating was evaluated through electrochemistry,static immersion corrosion,in vitro blood experiments and cell ***19k effectively improved the corrosion resistance of the substrate ZE21B,reduced the degradation rate,improved endothelial cell proliferation and migration capabilities,inhibited smooth muscle cells proliferation and regulated contractile phenotype,inhibited macrophage adhesion,regulated macrophage M2 phenotype,and reduced the expression of inflammatory factor of TNF-a and inhibited fibroplasia in *** data indicated that the barnacle cement cp19k coating had potential application on the surface modification of Mg alloy cerebrovascular stent.

关键词： Cerebrovascular stent Biodegradable magnesium alloy Barnacle cement cp19k Proendothelialization M2 phenotype

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Axon-like aligned conductive CNT/GelMA hydrogel fibers combined with electrical stimulation for spinal cord injury recovery

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Bioactive materials 2024年第5期35卷 534-548页

作者： Shenglian Yao Yongdong Yang Chenyu Li Kaitan Yang Xin Song Chuanhong Li Zheng Cao He Zhao Xing Yu Xiumei Wang Lu-Ning Wang School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Department of Orthopedics Dongzhimen HospitalBeijing University of Chinese Medicine5 Hai Yun CangBeijing100700China

Rehabilitation and regenerative medicine are two promising approaches for spinal cord injury(SCI)recovery,but their combination has been *** biomaterials could bridge regenerative scaffolds with electrical stimulation by inducing axon regeneration and supporting physiological electrical signal ***,we developed aligned conductive hydrogel fibers by incorporating carbon nanotubes(CNTs)into methacrylate acylated gelatin(GelMA)hydrogel via rotating liquid bath *** electrospun CNT/GelMA hydrogel fibers mimicked the micro-scale aligned structure,conductivity,and soft mechanical properties of neural *** in vitro studies,CNT/GelMA hydrogel fibers supported PC12 cell proliferation and aligned adhesion,which was enhanced by electrical stimulation(ES).Similarly,the combination of aligned CNT/GelMA hydrogel fibers and ES promoted neuronal differentiation and axon-like neurite sprouting in neural stem cells(NSCs).Furthermore,CNT/GelMA hydrogel fibers were transplanted into a T9 transection rat spinal cord injury model for in vivo *** results showed that the incorporating CNTs could remain at the injury site with the GelMA fibers biodegraded and improve the conductivity of regenerative *** aligned structure of the hydrogel could induce the neural fibers regeneration,and the ES enhanced the remyelination and axonal *** assessments and electrophysiological results suggest that the combination of aligned CNT/GelMA hydrogel fibers and ES could significantly restore motor function in *** study demonstrates that conductive aligned CNT/GelMA hydrogel fibers can not only induce neural regeneration as a scaffold but also support ESto promote spinal cord injury *** conductive hydrogel fibers enable merging regenerative medicine and rehabilitation,showing great potential for satisfactory locomotor recovery after SCI.

关键词： Conductive hydrogel fibers CNT/GelMA Electrical stimulation NSCs differentiation Spinal cord injury

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Second phase refining induced optimization of Fe alloying in Zn:Significantly enhanced strengthening effect and corrosion uniformity

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International Journal of Minerals,Metallurgy and materials 2022年第4期29卷 796-806页

作者： Zhangzhi Shi Changheng Li Meng Li Xiangmin Li Luning Wang Beijing Advanced Innovation Center for Materials Genome Engineering Key Laboratory for Advanced Materials Processing of Ministry of EducationBeijing Laboratory of Metallic Materials and Processing for Modern TransportationSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Many non-toxic alloying elements,such as Fe,Ca,and Sr,have negligible solid solubilities in Zn matrix,leading to formation of coarse second phase *** exhibit low strengthening effects but highly detrimental to *** refining second phase is a common pursuit for Zn *** present paper takes Zn-0.3Fe alloy suffered from coarse FeZn_(13) second phase particles as a touchstone to testify microstructure refining effect through solidification with an accelerated speed and multi-pass ***_(13) particles are refined from 24 to 2μm,and Zn grains are refined to 5μ*** a result,the strengthening effect of Fe is enhanced significantly,with yield strength and the ultimate tensile strength of the alloy increased from 132 to 218 MPa and from 159 to 264 MPa,***,corrosion non-uniformity and penetration are much *** results show that microstructure refinement,especially on coarse intermetallic second phases,has a great potential to improve mechanical and degradation properties of biodegradable Zn alloys.

关键词： zinc alloys microstructure mechanical properties corrosion uniformity

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A brand new green coating technology for realizing the regulation of spherical propellant energy release process

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Defence Technology（防务技术） 2024年第6期36卷 78-94页

作者： Wenhao Fan Yajun Ding Zhongliang Xiao School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing210094China Key Laboratory of Special Energy Materials Nanjing University of Science and TechnologyMinistry of EducationNanjing 210094China

To achieve the controllable release of energy of nitrocellulose-based propellants,this paper combines the cellulose-based nanocomposites aqueous coating(Surelease®-NC)with fluidized bed coating equipment to successfully prepare the coated spherical propellant for the first *** effects of fluidized bed coating temperature,air velocity,flow speed and atomization pressure on the adhesion rate,coating integrity and coating uniformity of the coated spherical propellant were investigated,and the preparation of coated spherical propellant with homogeneous size and structural integrity was achieved for the first *** microscopic morphology,chemical structure,water vapor adsorption behavior,combustion performance,and ageing resistance property of the coated spherical propellant were systematically investigated by,Fourier transforms infrared spectroscopy(FTIR),Micro confocal raman spectrometer,field scanning electron microscopy(SEM),dynamic vapor adsorption techniques,and closed bomb test,confirming the surface core-shell structure and the tightly bonded interfacial structure of coated spherical ***,the coated spherical propellant has good hygroscopic,excellent progressive burning and long storage stability.

关键词： Nanocomposites aqueous coating Fluidized bed coating equipment Coated spherical propellant Controllable release of energy Long storage stability

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