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Effects of cooling rate on the microstructure and properties of magnesium alloy-a review

Journal of Magnesium and Alloys 2024年第8期12卷 3094-3114页

作者： Huisheng Cai Nannan zhang Liang Liu Juan Su yuguang Li yu Kang feng guo Inner Mongolia Key Laboratory of Thin Film and Coatings School of Material Science and EngineeringInner Mongolia University of TechnologyHohhot 010051China School of Sino-German Engineering Shanghai Technical Institute of Electronics and InformationShanghai 201411China

Magnesium alloy is one of the most widely used lightweight structural materials,and the development of high strength-toughness magnesium alloy is an important research field at present and even in the *** preparation process parameters of magnesium alloy directly affect the microstructure of the magnesium alloy,and then determine the properties of the magnesium *** cooling rate has important effects on the microstructure and properties of the magnesium alloy,and is an important preparation process parameter that cannot be *** the cooling rate from liquid phase to solid phase and the cooling rate of the magnesium alloy after heat treatment will change the microstructure of the magnesium ***,the properties of magnesium alloy will be *** this paper,the effects of cooling rate on the solidification behavior,the rheological behavior,the change of microstructure(the solid solution of alloying elements in matrix,the composition,size,distribution and morphology of second phase,the diffusion and segregation of alloying elements,the grain size,the formation and morphology of dendrite,etc.),and the effects of cooling rate of magnesium alloy after heat treatment on the microstructure and stress distribution are *** reasons for the divergence about the influence of cooling rate on the microstructure of magnesium alloy are analyzed in *** effects of cooling rate on the mechanical properties,corrosion resistance and oxidation resistance of magnesium alloy are also analyzed and discussed ***,the new methods and approaches to study the effects of cooling rate on the microstructure and properties of magnesium alloy are prospected.

关键词： Magnesium alloy Cooling rate Microstructure Mechanical properties Corrosion resistance Oxidation resistance

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In-situ ZrB2-hBN ceramics with high strength and low elasticity

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Journal of Materials Science & Technology 2020年第13期47卷 186-193页

作者： Ji Zou guo-Jun zhang Zheng-Yi fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Metallurgy and Materials University of BirminghamB152TTBirminghamUK State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsDonghua UniversityShanghai 201620China

ZrB2 ceramics with various hexagonal BN(hBN)additions up to 37 vol%were reactively densified by spark plasma sintering using powder mixtures containing ZrB2,ZrN and ***-boron based additives effectively promoted the densification process,ZrB2 ceramics reached>99%relative density at 2000℃and an applied pressure of 60 MPa with only 5 vol%in-situ formed hBN,whereas the relative density of pure ZrB2 was only 91.2%at the same *** thehBN contents,the morphology of hBN grains gradually changed from quasi-spherical to flake dominated,which has substantial influence on their mechanical ***-situ ZrB2-10 vol%hBN ceramics demonstrated high flexural strength of 597±22 MPa,relatively low Young’s modulus of 406 GPa and good machinability,especially for the impressively large strain to failure(1.47×10^-3)which is superior to most of their counterparts in the ZrB2 based particulate reinforced ceramics.

关键词： ZrB2 Reactive sintering Spark plasma sintering Boron nitride containing ceramics Mechanical property

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Self-assembled donor-acceptor hole contacts for inverted perovskite solar cells with an efficiency approaching 22%: The impact of anchoring groups

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Journal of Energy Chemistry 2022年第5期31卷 87-95页

作者： Qiaogan Liao Yang Wang Zilong zhang Kun Yang Yongqiang Shi kui feng Bolin Li Jiachen Huang Peng Gao Xugang guo Department of Materials Science and Engineering Guangdong Provincial Key Laboratory of Functional Oxide Materials and DevicesSouthern University of Science and Technology(SUSTech)Shenzhen 518055GuangdongChina College of Materials Fujian Key Laboratory of Advanced MaterialsXiamen UniversityXiamen 361005FujianChina CAS Key Laboratory of Design and Assembly of functional Nanostructures Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002FujianChina School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

Self-assembled molecules(SAMs) have shown great potential in replacing bulk charge selective contact layers in high-performance perovskite solar cells(PSCs) due to their low material consumption and simple processing. Herein, we design and synthesize a series of donor-acceptor(D-A) type SAMs(MPA-BTCA, MPA-BT-BA, and MPA-BT-RA, where MPA is 4-methoxy-N-(4-methoxyphenyl)-N-phenylaniline;BT is benzo[c][1,2,5]-thiadiazole;CA is 2-cyanoacrylic acid, BA is benzoic acid, RA is rhodanine-3-propionic acid) with distinct anchoring groups, which show dramatically different properties. MPA-BTCA with CA anchoring groups exhibited stronger dipole moments and formed a homogeneous monolayer on the indium tin oxide(ITO) surface by adopting an upstanding self-assembling mode. However, the MPA-BT-RA molecules tend to aggregate severely in solid state due to the sp~3 hybridization of the carbon atom on the RA group, which is not favorable for achieving a long-range ordered self-assembled ***, benefiting from high dipole moment, as well as dense and uniform self-assembled film,the device based on MPA-BT-CA yielded a remarkable power conversion efficiency(PCE) of 21.81%.Encouragingly, an impressive PCE approaching 20% can still be obtained for the MPA-BT-CA-based PSCs as the device area is increased to 0.80 cm^(2). Our work sheds light on the design principles for developing hole selecting SAMs, which will pave a way for realizing highly efficient, flexible, and large-area PSCs.

关键词： Self-assembled molecules Donor-acceptor backbones Hole contacts Perovskite solar cells Anchoring groups

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Benzoselenol as an organic electrolyte additive in Li-S battery

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Nano Research 2023年第3期16卷 3814-3822页

作者： Junpeng Sun Kai zhang Yongzhu fu Wei guo College of Chemistry Zhengzhou UniversityZhengzhou 450001China

Lithium-sulfur(Li-S)battery is one of the promising high-energy battery systems for future ***,the shuttle effect due to the dissolved lithium polysulfides in ether electrolyte hampers its practical *** electrolyte additives in Li-S battery has been widely acknowledged as an effective way to reduce the shuttle effect and improve cycling *** this work,benzoselenol(PhSeH)is used as an organic electrolyte additive in Li-S *** reacts with elemental sulfur to form phenyl selenosulfide,altering the redox pathway of the cathode with the regeneration of S8 at the end of charge and enabling new redox reactions with high *** Li-S coin cell with an optimized amount of PhSeH in the electrolyte delivers a high discharge capacity of 1,436 mAh·g^(−1)and a capacity retention of 92.86%in 200 cycles,and exhibits lower discharge overpotential in comparison to the cell with blank *** Li-S pouch cell with a low electrolyte/sulfur(E/S)ratio of 4.0μL·mg^(−1)shows a discharge capacity of 1,398 mAh and excellent capacity retention for 20 cycles.

关键词： lithium-sulfur(Li-S)battery benzoselenol electrolyte additive sulfur-selenium bond electrochemical performance

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Formation and thermal stability of amorphous Ni-Mo-P alloys

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中国有色金属学会会刊：英文版 2004年第z1期14卷 147-151页

作者： zhang Yi MA Jun FANG Yong-kui DUAN Ji-guo School of Municipal and Environmental Engineering Harbin Institute of TechnologyHarbin 150090 China College of Chemistry and Chemical Engineering Daqing Petroleum Institute Daqing 163318 China College of Chemistry and Chemical Engineering Daqing Petroleum Institute Daqing 163318 China School of Municipal and Environmental Engineering Harbin Institute of TechnologyHarbin 150090 China School of Municipal and Environmental Engineering Harbin Institute of TechnologyHarbin 150090 China

The experimental researches on the chemical deposition of Ni-Mo-P amorphous alloys were carried out by adding Na2 MoO4 into acidic solutions. The optimum technology conditions were obtained by orthogonal design experiments. The structures and the relationship between compositions and their thermal stability were studied by energy spectrum (EC), scanning electron micrograph and X-ray diffraction spectrum. Compared with Ni-P amorphous alloys, the Ni-Mo-P amorphous alloys have high crystallization temperature and thermal stability, and the hardness reaches its peak when the annealing temperature is 500 ℃. With the increase of the heat treatment temperature, the surface morphology of the alloys changes.

关键词： chemical deposition Ni-Mo-P alloy amorphous phase crystallization

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Effect of ternary transition metal sulfide FeNi_(2)S_(4)on hydrogen storage performance of MgH_(2)

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Journal of Magnesium and Alloys 2023年第8期11卷 2927-2938页

作者： Yaokun fu Lu zhang yuan Li Sanyang guo Han yu Wenfeng Wang Kailiang Ren Wei zhang Shumin Han State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Hebei Key Laboratory of Applied Chemistry School of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China

Hydrogen storage is a key link in hydrogen economy,where solid-state hydrogen storage is considered as the most promising approach because it can meet the requirement of high density and ***,magnesium-based materials(MgH_(2))are currently deemed as an attractive candidate due to the potentially high hydrogen storage density(7.6 wt%),however,the stable thermodynamics and slow kinetics limit the practical *** this study,we design a ternary transition metal sulfide FeNi_(2)S_(4)with a hollow balloon structure as a catalyst of MgH_(2)to address the above issues by constructing a MgH_(2)/Mg_(2)NiH_(4)-MgS/Fe ***,the dehydrogenation/hydrogenation of MgH_(2)has been significantly improved due to the synergistic catalysis of active species of Mg_(2)Ni/Mg_(2)NiH_(4),MgS and Fe originated from the MgH_(2)-FeNi_(2)S_(4)*** hydrogen absorption capacity of the MgH_(2)-FeNi_(2)S_(4)composite reaches to 4.02 wt%at 373 K for 1 h,a sharp contrast to the milled-MgH_(2)(0.67 wt%).In terms of dehydrogenation process,the initial dehydrogenation temperature of the composite is 80 K lower than that of the milled-MgH_(2),and the dehydrogenation activation energy decreases by 95.7 kJ·mol-1 compared with the milled-MgH_(2)(161.2 kJ·mol^(-1)).This method provides a new strategy for improving the dehydrogenation/hydrogenation performance of the MgH_(2)material.

关键词： Hydrogen storage materials Magnesium hydride FeNi_(2)S_(4) Hydrogen storage kinetics Catalysts

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Electrode materials for aqueous multivalent metal-ion batteries: Current status and future prospect

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Journal of Energy Chemistry 2022年第4期31卷 563-584页

作者： Na fu yu-Ting Xu Shu zhang Qi Deng Jun Liu Chun-Jiao Zhou Xiong-Wei Wu yu-guo guo Xian-Xiang Zeng School of Chemistry and Materials Science Hunan Agricultural UniversityChangsha 410128HunanChina CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China

In recent years,the pursuit of high-efficiency electrochemical storage technology,the multivalent metalion batteries (MIBs) based on aqueous electrolytes have been widely explored by researchers because of their safety,environmental friendliness,abundant reserves and low price,and especially the merits in energy and power *** review firstly expounds on the problems existing in the electrode materials of aqueous multivalent MIBs (Zn^(2+),Mg^(2+),Al^(3+),Ca^(2+)),from the classical inorganic materials to the emerging organic compounds,and then summarizes the design strategies in bulk and interface structure of electrodes with favorable kinetics and stable cycling performance,especially laying the emphasis on the charge storage mechanism of cathode materials and dendrite-free Zinc anode from the aspect of electrolyte optimization strategies,which can be extended to other aqueous multivalent ***,the possible development directions of the aqueous multivalent MIBs in the future are provided,anticipating to provide a meaningful guideline for researchers in this area.

关键词： Multivalent metal Aqueous batteries Electrode materials Electrolytes Design strategies

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Failure mechanism of a large-scale composite deposits caused by the water level increases

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Journal of Mountain Science 2023年第5期20卷 1369-1384页

作者： zhang Xin TU guo-xiang LUO Qi-feng TANG Hao zhang yu-lin LI An-run State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China

The failure of slope caused by variations in water levels on both banks of reservoirs is *** landslides greatly threaten the safety of reservoir *** large-scale composite deposits located on the Lancang River in Southwest China as a study case,the origin of the deposits was analyzed based on the field investigation and a multi-material model was established in the physical model *** with numerical simulation,the failure mechanism of the composite deposits during reservoir water level variations was *** results indicate that the deformation of the large-scale composite deposits is a staged sliding mode during the impoundment *** first slip deformation is greatly affected by the buoyancy weight-reducing effect,and the permeability of soil and variation in the water level are the factors controlling slope deformation *** high water sensitivity and low permeability of fine grained soil play an important role in the re-deformation of deposits *** the impoundment process,the deformation trend of the deposit slope is decreasing,and vertical consolidation of soil and increasing hydrostatic pressure on the slope surface are the main reasons for deformation *** is considered that the probability of large-scale sliding of the deposits during the impoundment period is *** the damage caused by local bank collapse of the deposit slope still needs *** results of this paper will further improve our understanding of the failure mechanism of composite deposits caused by water level increases and provide guidance for the construction of hydropower stations.

关键词： Composite deposits Reservoir water level rise Physical model test Finite-differencemethod Failure mechanism

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Conductive Biomaterials as Bioactive Wound Dressing for Wound Healing and Skin Tissue Engineering

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Nano-Micro Letters 2022年第1期14卷 1-46页

作者： Rui yu Hualei zhang Baolin guo State Key Laboratory for Mechanical Behavior of Materials and Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710049People’s Republic of China Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of StomatologyXi’an Jiaotong UniversityXi’an 710049People’s Republic of China

Conductive biomaterials based on conductive polymers,carbon nanomaterials,or conductive inorganic nanomaterials demonstrate great potential in wound healing and skin tissue engineering,owing to the similar conductivity to human skin,good antioxidant and antibacterial activities,electrically controlled drug delivery,and photothermal ***,a review highlights the design and application of conductive biomaterials for wound healing and skin tissue engineering is *** this review,the design and fabrication methods of conductive biomaterials with various structural forms including film,nanofiber,membrane,hydrogel,sponge,foam,and acellular dermal matrix for applications in wound healing and skin tissue engineering and the corresponding mechanism in promoting the healing process were *** approaches that conductive biomaterials realize their great value in healing wounds via three main strategies(electrotherapy,wound dressing,and wound assessment)were *** application of conductive biomaterials as wound dressing when facing different wounds including acute wound and chronic wound(infected wound and diabetic wound)and for wound monitoring is discussed in *** challenges and perspectives in designing and developing multifunctional conductive biomaterials are proposed as well.

关键词： Conducting polymers Inorganic nanomaterials Biomaterials Electrotherapy Wound monitoring

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Gain and phase errors active calibration method based on neural network for arrays with arbitrary geometry

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The Journal of China Universities of Posts and Telecommunications 2023年第2期30卷 8-17页

作者： Han Ziwen zhang Zhi guo yu State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

The manifold matrix of the received signals can be destroyed when the array is with the gain and phase errors,which will affect the performance of the traditional direction of arrival(DOA)estimation *** this paper,a novel active array calibration method for the gain and phase errors based on a cascaded neural network(GPECNN)was *** cascaded neural network contains two parts:signal-to-noise ratio(SNR)classification network and two sets of error estimation *** calibration subnetworks are activated according to the output of the SNR classification network,each of which consists of a gain error estimation network(GEEN)and a phase error estimation network(PEEN),*** disadvantage of neural network topology architecture is changing when the number of array elements varies is addressed by the proposed group calibration ***,due to the data characteristics of the input vector,the cascaded neural network can be applied to arrays with arbitrary geometry without repetitive *** results demonstrate that the GPECNN not only achieves a better balance between calibration performance and calibration complexity than other methods but also can be applied to arrays with different numbers of sensors or different shapes without repetitive training.

关键词： active array calibration cascaded neural network direction of arrival(DOA)estimation

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