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Atomic-scale investigation of precipitate phases in QE22 Mg alloy

Journal of materials science & Technology 2024年第10期177卷 114-127页

作者： Xiaojun Zhao Zhiqiao Li Aiping Zhang Longlong Hao Houwen Chen Jian-Feng Nie Key Laboratory of Advanced Technologies of Materials Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China International Joint Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Department of Materials Science and Engineering Monash UniversityVictoria 3800Australia

Precipitation-hardenable commercial Mg alloy QE22(***-0.7Zr,wt.%)has excellent mechan-ical properties,but precipitates in this alloy have not been well *** this work,precipitate phasesγ",γ,andδformed during the isothermal ageing process at 150,200,250,and 300℃have been characterized using atomic-resolution high-angle annular dark-field scanning transmission electron mi-croscopy and atomic-scale energy-dispersive X-ray *** morphology,crystal structure,and orientation relationship of these precipitate phases have been *** boundaries usually exist in a singleγparticle,which can be characterized by a separation vector of[1(1)01]_(α).Theδphase forms in situ from its precursorγphase,consequently leading to the formation of three different variants within a single 8 *** nucleation of theδphase is strongly related to the domain boundaries of the y *** formation of theγphase may be promoted by its precursorγ"*** similarities in atomic structures of theγ",γ,andδphases are described and discussed,indicating that transfor-mations between these precipitate phases can be accomplished through the diffusion of added alloying elements.

关键词： Magnesium alloy Precipitation Phase identification Phase transformation Electron microscopy

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Elements gradient doping in Mn-based Li-rich layered oxides for long-life lithium-ion batteries

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材料科学技术（英文版） 2025年第4期207卷 266-273页

作者： Yinzhong Wang Shiqi Liu Xianwei Guo Boya Wang Qinghua Zhang Yuqiang Li Yulong Wang Guoqing Wang Lin Gu Haijun Yu Institute of Advanced Battery Materials and Devices College of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China Key Laboratory of Advanced Functional Materials Ministry of EducationBeijing University of TechnologyBeijing 100124China Institute of Advanced Battery Materials and Devices College of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China Key Laboratory of Advanced Functional Materials Ministry of EducationBeijing University of TechnologyBeijing 100124China Beijing Create Energy & Benefit Future Co. Ltd.Beijing 100176China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China National Center of Electron Microscopy in Beijing School of Materials Science and EngineeringTsinghua UniversityBeijingChina

The cobalt-free Mn-based Li-rich layered oxide material has the advantages of low cost,high energy den-sity,and good performance at low temperatures,and is the promising choice for energy storage ***,the long-cycling stability of batteries needs to be ***,the Mn-based Li-rich cath-ode materials with small amounts of Li2MnO3 crystal domains and gradient doping of Al and Ti elements from the surface to the bulk have been developed to improve the structure and interface *** the batteries with a high energy density of 600 Wh kg-1,excellent capacity retention of 99.7％with low voltage decay of 0.03 mV cycle-1 after 800 cycles,and good rates performances can be ***,the structure and cycling stability of low voltage Mn-based Li-rich cathode materials can be significantly improved by the bulk structure design and interface regulation,and this work has paved the way for developing low-cost and high-energy Mn-based energy storage batteries with long lifetime.

关键词： Mn-based Li-rich layered oxide cathode Li2MnO3 crystal domain Elemental gradient Lithium-ion batteries Energy storage

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Recent progresses in thermal treatment of β-Ga_(2)O_(3) single crystals and devices

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International Journal of Minerals,Metallurgy and materials 2024年第7期31卷 1659-1677页

作者： Yuchao Yan Zhu Jin Hui Zhang Deren Yang State Key Laboratory of Silicon and Advanced Semiconductor Materials and School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Zhejiang Provincial Key Laboratory of Power Semiconductor Materials and Devices ZJU-Hangzhou Global Scientific and Technological Innovation CenterHangzhou 311200China

In recent years,ultra-wide bandgap β-Ga_(2)O_(3) has emerged as a fascinating semiconductor material due to its great potential in power and photoelectric *** semiconductor industrial,thermal treatment has been widely utilized as a convenient and effective approach for substrate property modulation and device ***,a thorough summary of β-Ga_(2)O_(3) substrates and devices behaviors after high-temperature treatment should be *** this review,we present the recent advances in modulating properties of β-Ga_(2)O_(3) substrates by thermal treatment,which include three major applications:(ⅰ)tuning surface electrical properties,(ⅱ)modifying surface morphology,and(ⅲ)oxidating ***,regulating electrical contacts and handling with radiation damage and ion implantation have also been discussed in device *** each category,universal annealing conditions were speculated to figure out the corresponding problems,and some unsolved questions were proposed *** review could construct a systematic thermal treatment strategy for various purposes and applications of β-Ga_(2)O_(3).

关键词： β-gallium oxide thermal treatment substrates devices

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Simple and effective:Superlubricity behaviour of the G-quadruplex hydrogel with high selectivity for K^(+) ions based on the ocular environment

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Friction 2024年第11期12卷 2548-2562页

作者： Hongdong WANG Jian WU Kunpeng WANG Yunjuan SU Xiacong ZHANG Yuhong LIU Jianhua ZHANG School of Mechatronic Engineering and Automation and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China Department of Polymer Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

Hydrogels have been the subject of significant research in the field of friction due to their exceptional lubricating *** this study,the G-quadruplex hydrogel with high selectivity for K^(+) ions was formed by introducing a mixture of G,2-formylphenylboronic acid,and polyethylene glycol diamine into simulated artificial tears solution with high transparency,and an ultra-low coefficient of friction(COF)of about 0.004 was obtained based on the simulated ocular environment,thus achieving macroscopic *** friction pairs simulating the ocular environment,to assess the frictional performance of the G-quadruplex hydrogel as both a lubricant and a friction pair based on the simulated ocular environment,we conducted experiments considering various factors such as concentration,sliding speed,and *** these experiments,it was found that superlubricity was achieved when the G-quadruplex hydrogel was applied as lubricant or friction *** effect was attributed to the three-dimensional network structure and hydrophilicity of the hydrogel,which facilitated the formation of a highly bearing and flowing hydration layer,promoting macroscopic *** to the G-quadruplex hydrogel with low concentration,the high concentration hydrogel(75 mM)exhibited increased mechanical strength and robustness in *** with biocompatibility experiments,our synthesized G-quadruplex hydrogel has excellent biocompatibility and offers a novel approach to achieve superlubricity in ocular drug delivery.

关键词： superlubricity ocular environment G-quadruplex hydrogel bio-compatibility

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High strength and high work hardening rate in oxygen gradient Ti-15Mo alloy

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Journal of materials science & Technology 2024年第31期198卷 56-62页

作者： Zhixin Wang Kai Yao Binkai Du Suyun He Xiaohua Min Shewei Xin Shijian Zheng Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin 300130China School of Materials Science and Engineering Dalian University of TechnologyDalian 116024China Northwest Institute for Non-Ferrous Metal Research Xi'an 710016China

The low work hardening is a prominent deficiency for high-strength titanium(Ti)*** gradient design of oxygen content was adopted to realize the coupling deformation of{332}twinning and dislocation slip in the Ti-15Mo ... 详细信息

The low work hardening is a prominent deficiency for high-strength titanium(Ti)*** gradient design of oxygen content was adopted to realize the coupling deformation of{332}<113>twinning and dislocation slip in the Ti-15Mo *** oxygen gradient alloy exhibited an optimal balance of yield/tensile strength(700 and 848 MPa)and elongation(25%),with remarkable work hardening *** dominated dislocation slip deformation and the solution strengthening of oxygen atoms in the oxygen-rich region resulted in a remarkable increase in yield *** successive formation of{332}<113>twins and piled-up geometrically necessary dislocations around the twin boundaries in the oxygen-free region induced remarkable back stress strengthening,maintaining the high work hardening rate,which resulted in a stable increase in *** twins and dislocations formed at the crack tips effectively hindered the cracking behavior,avoiding premature *** present study provides a novel idea for designing oxygen layer-distributed Ti alloys,which further improves the strength-ductility tradeoff.

关键词： Titanium alloys Oxygen gradient Work hardening Heterogeneous material Ductility

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Organic interfacial engineering of gold nanowires for selective glycerol electrooxidation

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Chinese Chemical Letters 2024年第3期35卷 502-507页

作者： Zhe Wang Qingling Hong Boqiang Miao Tianjiao Wang Yu Ding Pujun Jin Pei Chen Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry(Ministry of Education)Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710062China

The selective electrochemical conversion of glycerol into value-added products is a green and sustainable strategy for the biomass *** this work,Au nanowires(Au-NW)modified with polyethyleneimine(PEI)molecule(Au-NW@PEI)is obtained by an up-bottom post-modification *** characterization,molecular dynamics simulation and density functional theory demonstrate that the loose-packed PEI monolayer firmly and uniformly distribute on the Au-NW surface due to the strong Au-N *** experiments and product analysis display that PEI modification significantly enhance the electro-activity of Au-NW for the glycerol electro-oxidation reaction(GEOR)due to the electronic ***,the steric hindrance and electrostatic effect of PEI layer make the optimizing adsorption of intermediates ***,the selectivity of C3 product glyceric acid over Au-NW@PEI is increased by nearly 20%.The work thus indicates that the rational design of metal-organic interface can effectively elevate the electro-activity and selectivity of Au nanostructures,which may have wide application in biomass development.

关键词： Glycerol electrooxidation reaction Organic interface engineering Gold-based nanomaterials Electrocatalysis Selectivity

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Surface chemistry of electrode materials toward improving electrolyte-wettability:A method review

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InfoMat 2024年第11期6卷 31-65页

作者： Lei Zhao Yuanyou Peng Peiyao Dou Yuan Li Tianqi He Fen Ran State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Department of Polymeric Materials Science and EngineeringSchool of Materials Science and EngineeringLanzhou University of TechnologyLanzhouthe People's Republic of China

The electrolyte-wettability at electrode material/electrolyte interface is a criticalfactor that governs the fundamental mechanisms of electrochemical reactionefficiency and kinetics of electrode materials in practical electrochemicalenergy storage. Therefore, the design and construction of electrode materialsurfaces with improved electrolyte-wettability has been demonstrated to beimportant to optimize electrochemical energy storage performance of electrodematerial. Here, we comprehensively summarize advanced strategies and keyprogresses in surface chemical modification for enhancing electrolytewettabilityof electrode materials, including polar atom doping by post treatment,introducing functional groups, grafting molecular brushes, and surfacecoating by in situ reaction. Specifically, the basic principles, characteristics,and challenges of these surface chemical strategies for improving electrolytewettabilityof electrode materials are discussed in detail. Finally, the potentialresearch directions regarding the surface chemical strategies and advancedcharacterization techniques for electrolyte-wettability in the future are *** review not only insights into the surface chemical strategies forimproving electrolyte-wettability of electrode materials, but also provides strategicguidance for the electrolyte-wettability modification and optimization ofelectrode materials in pursuing high-performance electrochemical energy storagedevices.

关键词： chemical modification electrochemical energy storage electrode materials electrode/electrolyte interface surface chemistry

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Beam oscillating parameters on pore inhibition,recrystallization and grain boundary characteristics of laser-arc hybrid welded AZ31 magnesium alloy

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Journal of Magnesium and Alloys 2024年第6期12卷 2489-2502页

作者： Kangda Hao Yongkang Gao Lianyong Xu Yongdian Han Lei Zhao Wenjin Ren Hongyang Jing School of Materials Science and Engineering Tianjin UniversityTianjin300350PR China Tianjin Key Laboratory of Advanced Joining Technology Tianjin300350PR China

Oscillating laser-arc hybrid welding of AZ31B magnesium alloy was carried out,the effects of beam oscillation parameters on pore inhibition,microstructure,grain boundary characteristics and tensile properties were *** results showed that the pore formation can be inhibited with oscillating frequency higher than 75 Hz and radius smaller than 0.5 *** columnar grains neighboring the fusion line can be broken by the beam oscillation behavior,while the grain growth was promoted with the increase of frequency or *** should be noted that the coincidence site lattice(CSL)boundaries were mainlyΣ13b andΣ29 boundaries,which were contributed by{10■2}tensile twins and{11■2}compression twins,*** total fraction of CSL boundaries reached maximum at radius of 0.25 mm and frequency of 75 Hz,which was also confirmed as the optimized *** this case,the elongation rate increased up to 13.2%,12.8%higher than that of the weld without beam ***,the pore formation and inhibition mechanisms were illustrated according to the state of melt flow and keyhole formation,the abnormal growth was discussed basing on secondary recrystallization,and the relationship among the pore formation,grain size,boundary characteristics and weld toughness were finally established.

关键词： Magnesium alloy Laser-arc hybrid welding Beam oscillation Recrystallization Mechanical properties

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Crystalline/Non-Crystalline Carbon Co-Modified Strategy to Construct N,S Co-Doped Carbon Layer Wrapped Fe_(0.95)S_(1.05)/Carbon Nanotubes for Enhanced Lithium Storage Property

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Acta Metallurgica Sinica(English Letters) 2025年第1期38卷 93-101页

作者： Liang Chen Lan−Yun Yang Li−Ting Zeng Xu Liu Xin−Rui Li Yu−Shan Tian Wei Wang Gang−Yong Li Chen−Xi Xu Zhao−Hui Hou Key Laboratory of Hunan Province for Advanced Carbon‒based Functional Materials School of Chemistry and Chemical EngineeringHunan Institute of Science and TechnologyYueyang414006China College of Materials Science and Engineering Central South University of Forestry and TechnologyChangsha410004China

Due to their high theoretical capacity and abundant resources,transition metal sulfides are regarded as a prospering alternative to replace the commercial graphite anode in lithium-ion batteries(LIBs),particularly for large-scale energy storage and conversion ***,low conductivity,easy agglomeration and obvious volume change greatly impede their practical *** this work,a novel crystalline/non-crystalline carbon co-modified strategy is proposed to fabricate N,S co-doped carbon(NSC)layer wrapped Fe_(0.95)S_(1.05)/carbon nanotubes(CNTs)composite(Fe_(0.95)S_(1.05)/CNTs@NSC)through a simple Fenton reaction followed by a sulfurization *** characterizations and analyses reveal that this strategy well combines the advantages of crystalline CNTs and non-crystalline NSC,ensuring good conductivity and a high contribution to capacity from the carbon ***,the joint encapsulation of Fe_(0.95)S_(1.05)by both CNTs and NSC can significantly mitigate the agglomeration and volume change of Fe_(0.95)S_(1.05)during the continuous charge/discharge *** from these advantageous features,the resultant Fe_(0.95)S_(1.05)/CNTs@NSC composite displays much improved cycling stability and rate capability when compared to the ***,our research offers a distinct and innovative approach to design and construct advanced transition metal sulfides/carbon composite anodes for LIBs.

关键词： Lithium-ion batteries Crystalline/non-crystalline carbon Joint encapsulation Fe_(0.95)S_(1.05)/CNTs@NSC Lithium storage property

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Tailoring mechanical heterogeneity,nanoscale creep deformation and optical properties of nanostructured Zr-based metallic glass

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Rare Metals 2023年第10期42卷 3430-3442页

作者： Jing-Xian Cui Qiang Luo Zheng-Guo Zhang Jing-Tao Zhu Bao-Long Shen School of Materials Science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing211189China School of Physics Science and Engineering Tongji UniversityShanghai200092China

Metallic glasses are spatially heterogeneous at the nanometer ***,the effects of external excitation on their structural and mechanical heterogeneity and the correlation to their properties are still ***,atomic force microscopy(AFM) and high-resolution transmis sion elec tron micro scopy(HRTEM) were carried out to explore the effects of cryogenic thermal cycling(CTC) on mechanical/structural heterogeneity,nano sc ale creep deformation and optical properties of nano structured metallic glass thin films(MGTFs).The results indicate that CTC treatment alters the distribution fluctuations of hardness/modulus and energy dissipation and results in an increase-then-decrease variation in mechanical *** applying Maxwell-Voigt model,it can be shown that CTC treatment results in a remarkable activation of more defects with longer relaxation time in soft regions but has only a slight effect on defects in hard *** addition,CTC treatment increases the transition time from primary-state stage to steady-state stage during creep *** enhanced optical reflectivity of the MGTFs after 15 thermal cycles can be attributed to increased aggregation of Cu and Ni *** results of this study shed new light on understanding mechanical/structural heterogeneity and its influence on nanoscale creep deformation and optical characteristics of nanostructured MGTFs,and facilitate the design of high-performance nanostructured MGTFs.

关键词： Metallic glass thin films(MGTFs) Cryogenic thermal cycling(CTC) Structural heterogeneity Mechanical and creep properties Optical characteristics

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