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High-Superelasticity NiTi Shape Memory Alloy by Directed Energy Deposition-Arc and Solution Heat Treatment

Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 132-144页

作者： Junyi Ma Lin Yu Qing Yang Jie Liu Lei Yang State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430070China School of Transportation and Logistics Engineering Wuhan University of TechnologyWuhan430074China

Directed energy deposition-arc(DED-Arc)technology has the advantages of simple equipment,low manufacturing cost and high deposition rate,while the use of DED-Arc has problems of microstructure inhomogeneity,position dependence of macroscopic mechanical properties and ***,it is necessary to carry out a subsequent heat treatment to improve its microstructure uniformity,mechanical properties and *** this investigation,the DED-Arc 15-layer NiTi alloy thin-walled parts with the solution treatment at different process parameters were studied to analyze the effects of solution heat treatment on microstructure,phase composition,phase transformation,microhardness,tensile and *** temperature range of solution treatment is 800-1050℃,and the treatment time range is 1-5.5 *** results show that after solution treatment at 800℃/1 h,the content of precipitated phase decreases,the grain is refined,the microhardness increases,and the mechanical properties in the 0°direction are *** strain recovery rate after 10 tensile cycles has increased from 37.13%(as-built)to 49.25%(solid solution treatment).This research provides an effective post treatment method for high-performance DED-Arc NiTi shape memory alloys.

关键词： Directed energy deposition-arc(DED-Arc) Cold metal transfer(CMT) NiTi shape memory alloys Microstructure Phase transformation Solution heat treatment

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Dual-salt poly(tetrahydrofuran) electrolyte enables quasi-solid-state lithium metal batteries to operate at -30 ℃

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Journal of Energy Chemistry 2024年第9期96卷 456-463页

作者： Zhiyong Li Zhuo Li Rui Yu Xin Guo School of Materials Science and Engineering State Key Laboratory of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074HubeiChina The State Key Laboratory of Refractories and Metallurgy and Institute of Advanced Materials and Nanotechnology Wuhan University of Science and TechnologyWuhan 430081HubeiChina

The stable operation of solid-state lithium metal batteries at low temperatures is plagued by severe restrictions from inferior electrolyte-electrode interface compatibility and increased energy barrier for Li^(+)***,we prepare a dual-salt poly(tetrahydrofuran)-based electrolyte consisting of lithium hexafluorophosphate and lithium difluoro(oxalato)borate(LiDFOB).The Li-salt anions(DFOB−)not only accelerate the ring-opening polymerization of tetrahydrofuran,but also promote the formation of highly ion-conductive and sustainable interphases on Li metal anodes without sacrificing the Li^(+)conductivity of electrolytes,which is favorable for Li^(+)transport kinetics at low *** of this polymer electrolyte in Li||LiFePO_(4)cells show 82.3%capacity retention over 1000 cycles at 30℃and endow stable discharge capacity at−30℃.Remarkably,the Li||LiFePO4 cells retain 52%of their room-temperature capacity at−20℃and 0.1 *** rational design of dual-salt polymer-based electrolytes may provide a new perspective for the stable operation of quasi-solid-state batteries at low temperatures.

关键词： Poly(tetrahydrofuran) Dual-salt electrolyte Solidel ectrolyte interphase Low-temperature operation Quasi-solid-state battery

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Vapor-Phase Precise-Synthesis of 2D Inorganic materials for Optoelectronics

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Chinese Journal of Chemistry 2023年第7期41卷 825-834页

作者： Xing Zhou Fuwei Zhuge Han Wang Tianyou Zhai State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Sciences and EngineeringHuazhong University of Science and TechnologyWuhanHubei430074 China

Comprehensive Summary 2D materials have attracted intensive attention due to their unique electrical and optical properties associated with their strictly defined low *** provide a wide range of basic building blocks for future electronics and *** chemical vapor deposition(CVD)has been proposed to be efficient to realize the controllable thickness,scalable size,which are necessary for both industrial applications and fundamental ***,we share our research works to realize the controllable growth of 2D *** found that stable growth microenvironment can regulate the growth of 2D ***,we developed near-steady source supply,space-confined,and additive-assisted passivated growth methods to solve the problem of unstable growth environment caused by uneven source and mass ***,we developed several strategies to precisely control the parity,separation,and transport of the carriers in 2D materials including fabricating defect-free interface via van der Waals dielectrics,modulating the parity of carriers via ferroelectric-field,and the separation of carriers via band *** future development,we highlight the opportunities and challenges inthis field.

关键词： 2D materials Heterostructures Chemical vapor deposition Photoelectric performances Nanostructures photodetectors

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Conjugated phthalocyanine-based framework as artificial SEI for over 400 Wh kg-1 lithium-metal battery

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National Science Review 2025年第2期12卷 155-164页

作者： Ying Zang Peng Peng Fei Pei Run-Han Li Lin Wu Di-Qiu Lu Yi Zhang Kai Huang Yue Shen Yun-Hui Huang Ya-Qian Lan School of Chemistry South China Normal University Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster MaterialsGreen Catalysis Center College of Chemistry Zhengzhou University State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology

High-voltage lithium-metal batteries（HVLMBs） are appealing candidates for next-generation high-energy rechargeable batteries, but their practical applications are still limited by the severe capacity degradation,attributed to the poor interfacial stability and compatibility between the electrode and the electrolyte. In this work, a 2D conjugated phthalocyanine framework（CPF） containing single atoms（SAs） of cobalt（CoSAs-CPF） is developed as a novel artificial solid–electrolyte interphase（SEI） in which a large amount of charge is transferred to the CPF skeleton due to the Lewis acid activity of the Co metal sites and the strong electron-absorbing property of the cyano group（-CN）, greatly enhancing the adsorption of the Li+and regulating the Li+distribution toward dendrite-free LMBs, which are superior to most of the reported SEI membranes. As a result, the Li||Li symmetrical cell with CoSAs-CPF-modified Li anodes（CoSAs-CPF@Li） exhibits a low polarization with an area capacity of 1.0 mAh cm-2over 3500 h. The LiFePO4（LFP） ||CoSAs-CPF@Li(LFP: 20 mg cm-2) delivers an ultra-long cycling life of ≤1000 cycles with a high capacity retention of 98.6%. Remarkably, the high-voltage LiNi0.8Co0.1Mn0.1O2||Li@CoSAs-CPF(NCM811: 10 mg cm-2) demonstrates a long cycling life of >800 cycles with a high capacity retention of 80%. Meanwhile, in situ ultrasonic transmission technology confirms the admirable ability of artificial CoSAs-CPF SEI to stabilize the Li-anode interface in pouch cells during cycling. Remarkably, the NCM811||Li@CoSAs-CPF pouch cell exhibits an energy density of 421 Wh kg-1and keeps 130 cycles with a low electrolyte/capacity ratio of 2.5 g Ah-1. The strategy of constructing the CoSAs-CPF-reinforced Li anode provides a promising direction for high-energy-density HVLMBs with long cycling stability.

关键词： conjugated phthalocyanine artificial SEI high energy density lithium-metal battery

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Arc additive manufacturing of gradient hot forging die with shaped waterways

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China Welding 2024年第1期33卷 27-39页

作者：余圣甫林海涛邱源 State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China

Under the working environment of high temperature and strong load impact,hot forging die is prone to failure which reduces the service life of *** arc additive manufacturing in the die cavity,a gradient material hot forging die with high precision,superior per-formance,and conformal cooling channels is *** improves the toughness of the die cavity and reduces the working temperature,thereby forming an isothermal field,which is an effective method to enhance the lifespan of the hot forging *** kinds of gradient flux-cored wires are designed for the surface of 5CrNiMo steel,and the microstructure and mechanical properties between gradient interfaces were *** on the spatial curved structure of shaped waterways in the hot forging die cavity,a study was conducted on the strategy of partitioned forming for the manufacturing of the die with shaped *** order to avoid interference with the arc gun,the hot for-ging die is divided into four regions,namely the transition region,upper,middle,and lower region,based on a combination of cavity depth and internal U-shaped and quadrilateral *** results show that the developed flux-cored wires have good moldability with straight sides of deposited metal under different process parameters and flat surface without cracks,pores and other *** the same working conditions,the life of hot forging die formed by the gradient materials is more than multiple times that of the single material hot forging die,and the temperature gradient field of the shaped waterway die is 7℃/cm smaller than that of traditional straight waterway.

关键词： gradient materials shaped waterways arc additive manufacturing mechanical property

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Van der Waals epitaxial growth of single-crystal molecular film

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National Science Review 2024年第11期11卷 194-202页

作者： Lixin Liu Penglai Gong Kailang Liu Bingrong Huang Zhihao Zhang Yingshuang Fu Yu Wu Yinghe Zhao Meihui Wang Yongshan Xu Huiqiao Li Tianyou Zhai State Key Laboratory of Materials Processing and Die &Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology Key Laboratory of Optic-Electronic Information and Materials of Hebei Province College of Physics Science and Technology Hebei University Wuhan National High Magnetic Field Center School of Physics Huazhong University of Science and Technology

Epitaxy is the cornerstone of semiconductor technology, enabling the fabrication of single-crystal *** advancements in van der Waals（vd W） epitaxy have opened new avenues for producing wafer-scale single-crystal 2D atomic crystals. However, when it comes to molecular crystals, the overall weak vd W force means that it is a significant challenge for small molecules to form a well-ordered structure during *** we demonstrate that the vd W epitaxy of Sb2O3molecular crystal, where the whole growth process is governed by vd W interactions, can be precisely controlled. The nucleation is deterministically modulated by epilayer–substrate interactions and unidirectional nuclei are realized through designing the lattice and symmetry matching between epilayer and substrate. Moreover, the growth and coalescence of nuclei as well as the layer-by-layer growth mode are kinetically realized via tackling the Schwoebel-Ehrlich barrier. Such precise control of vd W epitaxy enables the growth of single-crystal Sb2O3molecular film with desirable thickness. Using the ultrathin highly oriented Sb2O3film as a gate dielectric, we fabricated MoS2-based field-effect transistors that exhibit superior device performance. The results substantiate the viability of precisely managing molecule alignment in vd W epitaxy, paving the way for large-scale synthesis of single-crystal 2D molecular crystals.

关键词： van der Waals epitaxy inorganic molecular crystal layer-by-layer growth single-crystal film dielectric

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Study of microstructure evolution of magnesium alloy cylindrical part with longitudinal inner ribs during hot flow forming by coupling ANN-modified CA and FEA

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Journal of Magnesium and Alloys 2024年第8期12卷 3229-3244页

作者： Jinchuan Long Gangfeng Xiao Qinxiang Xia Xinyun Wang State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology1037 Luoyu RoadWuhan 430074China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510640China

Hot flow forming(HFF)is a promising forming technology to manufacture thin-walled cylindrical part with longitudinal inner ribs(CPLIRs)made of magnesium(Mg)alloys,which has wide applications in the aerospace ***,due to the thermo-mechanical coupling effect and the existence of stiffened structure,complex microstructure evolution and uneven microstructure occur easily at the cylindrical wall(CW)and inner rib(IR)of Mg alloy thin-walled CPLIRs during the *** this paper,a modified cellular automaton(CA)model of Mg alloy considering the effects of deformation conditions on material parameters was developed using the artificial neural network(ANN)*** is found that the ANN-modified CA model exhibits better predictability for the microstructure of hot deformation than the conventional CA ***,the microstructure evolution of ZK61 alloy CPLIRs during the HFF was analyzed by coupling the modified CA model and finite element analysis(FEA).The results show that compared with the microstructure at the same layer of the IR,more refined grains and less sufficient DRX resulted from larger strain and strain rate occur at that of the CW;various differences of strain and strain rate in the wall-thickness exist between the CW and IR,which leads to the inhomogeneity of microstructure rising firstly and declining from the inside layer to outside layer;the obtained Hall-Petch relationship between the measured microhardness and predicted grain sizes at the CW and the IR indicates the reliability of the coupled FEA-CA simulation results.

关键词： Magnesium alloy cylindrical part with longitudinal inner ribs Hot flow forming Microstructure evolution Artificial neural network Cellular automaton Finite element

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Enhancing constitutive description and workability characterization of Mg alloy during hot deformation using machine learning-based Arrhenius-type model

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Journal of Magnesium and Alloys 2024年第7期12卷 3003-3023页

作者： Jinchuan Long Lei Deng Junsong Jin Mao Zhang Xuefeng Tang Pan Gong Xinyun Wang Gangfeng Xiao Qinxiang Xia State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology1037 Luoyu RoadWuhan 430074China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510640China

Hot deformation is a commonly employed processing technique to enhance the ductility and workability of Mg ***,the hot deformation of Mg alloy is highly sensitive to factors such as temperature,strain rate,and strain,leading to complex flow behavior and an exceptionally narrow processing window for Mg *** overcome the shortcomings of the conventional Arrhenius-type(AT)model,this study developed machine learning-based Arrhenius-type(ML-AT)models by combining the genetic algorithm(GA),particle swarm optimization(PSO),and artificial neural network(ANN).Results indicated that when describing the flow behavior of the AQ80 alloy,the PSO-ANN-AT model demonstrates the most prominent prediction accuracy and generalization ability among all ML-AT and AT ***,an activation energy-processing(AEP)map was established using the reconstructed flow stress and activation energy fields based on the PSO-ANN-AT *** validations revealed that this AEP map exhibits superior predictive capability for microstructure evolution compared to the one established by the traditional interpolation methods,ultimately contributing to the precise determination of the optimum processing *** findings provide fresh insights into the accurate constitutive description and workability characterization of Mg alloy during hot deformation.

关键词： Constitutive description Workability characterization Machine learning Mg alloy Hot deformation

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Anisotropic Size Effect on the Plastic Deformation Behavior of α-Ti 14th

Anisotropic Size Effect on the Plastic Deformation Behavior ...

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14th International Conference on technology of Plasticity, ICTP 2023

作者： Zhang, Haidong Deng, Lei Wang, Xinyun Tang, Xuefeng Jin, Junsong State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783031413407

α-Ti sheets are widely used in manufacturing miniaturized components for the outstanding specific strength, corrosion resistance, and formability. However, the size effect brings severe challenges to the deformation and the service of micro parts, and the plastic anisotropy of α-Ti makes the micro-forming process more complicated. Therefore, a series of in-situ experiments and full-field crystal plasticity simulations were carried out to investigate the coupling effect of geometric size and plastic anisotropy of α-Ti. Anisotropic size effect on the plastic deformation was observed, and Diagonal Direction (DD) specimen shows a higher size effect sensitivity than that of RD (rolling direction) and TD (transverse direction) specimens. The flow stress and fracture strain decrease as the geometric size decreases, and the DD specimen shows a higher fracture strain reduction. Evident surface roughing and a higher proportion of hard-oriented grains in DD4 results in stronger intergranular strain heterogeneity, which leads to the formation of through-thickness shear bands as the geometric size decreases. The fracture mechanism in α-Ti transforms from a micro-void coalescence ductile mode to a brittle one as the geometric size decreases. These findings provide a fundamental understanding of the anisotropic size effect on the tensile behavior of α-Ti. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Textures

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Asymmetric Mesoporous Carbon Microparticles by 3D-Confined Self-Assembly of Block Copolymer/Homopolymer Blends and Selective Carbonization

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Chinese Journal of Polymer Science 2023年第5期41卷 787-793,I0010页

作者： Jing-Ye Liu Hao-Rui Song Mian Wang Shao-Hong Jin Zheng Liang Xi Mao Wang Li Ren-Hua Deng Jin-Tao Zhu State Key Laboratory of Materials Processing and Die&Mould Technology Key Laboratory of Material Chemistry for Energy Conversion and Storage of Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Shape control of mesoporous carbon microparticles(MCMPs)is of critical importance;in particular,asymmetric shapes that can yield unique properties have attracted significant ***,the tailored synthesis of asymmetric MCMPs with ordered structures remains ***,we report a facile route to prepare asymmetric MCMPs by dynamic neutral interface-guided 3D-confined self-assembly(3D-CSA)of block copolymer/homopolymer(BCP/hP)blends,followed by a self-templated selective direct carbonization ***/h P Janus microparticles with ordered hierarchical mesostructures were prepared with emulsion solvent evaporation-induced *** continuous phase of BCP domains was then *** asymmetric MCMPs are successfully generated after selective carbonization of the crosslinked continuous *** method allows tuning the shape of MCMPs easily by varying the blending ratio of BCP/h *** composite asymmetric MCMPs combine the advantages of asymmetric shape,ordered structure,high specific surface area,chemical inertness and thermal stability and could provide great possibilities for applications in catalysis,drug delivery,energy conversion and storage.

关键词： 3D-confined self-assembly Block copolymer Phase separation Mesoporous carbon spheres Janus

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