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science China(Technological sciences) 2023年第9期66卷 2457-2480页

作者： XIANG HengGao CHEN Yang QI ZhiXiang ZHENG Gong CHEN FengRui CAO YueDe LIU Xu ZHOU Bing CHEN Guang National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China

Intermetallic TiAl alloys attract much attention in advanced engineering fields due to their low density(3.9–4.2 g/cm3) and excellent high-temperature properties. After more than half a century of research and development, TiAl alloys have found applications in aerospace, automotive, and related industries. However, as a kind of semi-brittle materials, intermetallic TiAl alloys exhibit different mechanical behavior from metallic and ceramic materials. Thus, it is necessary to systematically understand their mechanical behavior to ensure further developments and safe engineering applications. In this paper, the principal mechanical behavior of Ti Al alloys was reviewed comprehensively, including tension, creep, fatigue, and strengthening mechanisms. The mechanical performance and the corresponding deformation mechanisms are summarized and discussed in detail. The future directions of mechanical research on TiAl alloys are also overviewed to expedite their extensive utilization in engineering fields.

关键词： TiAl tension creep fatigue strengthening mechanisms

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Perspective about gasoline soot combustion over ceria catalysts:A close look into the"active oxygen"enigma

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Journal of Rare Earths 2025年第4期43卷 641-659,I0001页

作者： Zilin Tu Gongde Wu Changlong Zheng Xiaodong Wu Jie Wan Shuang Liu School of Materials Science and Engineering Ocean University of ChinaQingdao266100China Energy Research Institute Nanjing Institute of TechnologyNanjing211167China Key Laboratory of Advanced Materials of Ministry of Education of China School of Materials Science and EngineeringTsinghua UniversityBeijing100084China

Catalyzed gasoline particulate filters(cGPFs)are being developed to enable compliance with the particulate number limits for passenger cars equipped with gasoline direct injection(GDI)engines in China and Europe,It is appealing to build catalysts with ceria—an irreplaceable"reducible"component in three-way converters—to help eliminate the soot particles trapped in cGPFs via O_(2)-assisted *** research aiming at understanding how these recipes function has continued for more than two decades,a universal model elucidating the roles of different"active oxygen"species is yet to be *** this perspective,by critically assessing the reported data about gasoline soot catalytic combustion over ceria catalysts,it is suggested that ceria ignites soot through contributing its lattice oxygen,giving rise to a"hot ring"region at the periphery of soot-catalyst *** the"re-oxidation"semi-cycles,electrophilic superoxides and/or peroxides(O_(x)^(n-))are produced at the Ce^(3+)and oxygen vacancy sites enriched in this collar-like region,and then work as key reactive phases for soot deep *** on this"O_(x)^(n-)assisted"Mars-van Krevelen mechanism,several guidelines for ceria catalyst designing are proposed,ending with a summary about where future opportunities and challenges may lie in developing efficient and practical cGPF catalysts.

关键词： Gasoline particulate filter Soot combustion Ceria catalysts Rare earths Reaction mechanism Catalyst design

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Anisotropic growth of nano-precipitates governed by preferred orientation and residual stress in an Al-Zn-Mg-Cu alloy

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Journal of materials science & Technology 2024年第21期188卷 234-251页

作者： Runze Wang Hongyun Luo Sujun Wu Tianshu Zhao Xin Wang Robert O.Ritchie School of Materials Science and Engineering Beihang UniversityBeijing 100191China Key Laboratory of Aerospace Materials and Performance Beihang UniversityBeijing 100191China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing 100191China Beijing Advanced Innovation Centre for Biomedical Engineering Beihang UniversityBeijing 100191China Surface Engineering Institution AECC Beijing Institute of Aeronautical MaterialsBeijing 100095China Department of Materials Science and Engineering University of CaliforniaBerkeleyCA 94720USA

Through an understanding of diffusion,precise control of the size distribution of nano-precipitates can be essential to developing superior properties in precipitation-strengthened *** a significant influence of crystallographic orientation on the diffusion process is known to exist in low-symmetry hexagonal close-packed alloys,such anisotropic diffusion is still unidentified in high-symmetry cubic *** this work,we reveal the diffusion-controlled coarsening induced anisotropic growth process of nano-precipitates in an Al-Zn-Mg-Cu *** experimental and theoretical studies demonstrate that with an increase in the residual stress,the diffusion-controlled coarsening rate is slow along the<112>fiber texture in the alloy matrix with smaller grain *** such,we find that the diffusion activation energy will be increased along the preferred orientation with largest residual stress,which leads to a reduced diffusion-controlled coarsening ***,we demonstrate that the increase in the volume fraction of nano-precipitates originates from the rapid grain-boundary controlled coarsening of the grainboundary *** on these results,an underlying microstructural design strategy is proposed,involving the crystallographic orientation,the residual stress and the grain boundaries to manipulate the precipitate size distribution in this class of alloys.

关键词： Aluminum alloy Precipitate coarsening behavior Preferred orientation Diffusion coefficient Residual stress

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Effect of Mn alloying on the hydrogen-assisted cracking behavior in multiphase/duplex stainless steel

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材料科学技术（英文版） 2025年第4期207卷 126-141页

作者： Menghao Liu Cuiwei Du Xiaogang Li Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Key Laboratory for Corrosion and Protection of the Ministry of Education Institute of Advanced Materials & TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China

There remains debate on whether Mn is beneficial or detrimental to hydrogen embrittlement in stainless *** this work,a series of stainless steels were designed to study the change of hydrogen embrit-tlement sensitivity,crack propagation,and hydrogen trapping behaviors upon Mn *** results suggest that adding 4 wt.％Mn increased hydrogen embrittlement susceptibility,whereas adding 8 wt.％Mn decreased hydrogen embrittlement *** banded α'-martensite through austenitic grain is the main reason for the increased hydrogen embrittlement sensitivity when adding 4 wt.％Mn,by ad-sorbing hydrogen,promoting crack initiation,and accelerating crack propagation.

关键词： Hydrogen-assisted cracking Multiphase stainless steel Manganese

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Strengthening in gradient TiAl alloys

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Journal of materials science & Technology 2023年第35期166卷 98-105页

作者： P.Li Y.Chen X.Liu X.H.Wang F.R.Chen Z.X.Qi G.Zheng H.G.Xiang G.Chen National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing210094China

Gradient structure is emerging as an effective strategy to fabricate metals with remarkable mechanical performance,but have not been verified in intermetallic compounds for high-temperature *** experiments and atomic simulations,we show that a typical intermetallic TiAl alloy with gra-dient structure has a significant strengthening effect both at room temperature and high *** room-temperature compressive strength of TiAl alloys with gradient grain obtained by additive man-ufacturing is 2.57 GPa,which is∼2.7 times as strong as that with equiaxed *** strengthening effect is attributed to more sessile dislocations in gradient structure caused by the intersections of mul-tiple slip systems in gradient *** importantly,the strengthening effect is still effective at high temperatures and the compressive strength is 1.28 GPa at 750°*** simulation results show that this strengthening effect is due to the increased Hirth dislocation at high *** study expands the applications of TiAl alloys for load-bearing structures and provides a new strategy for improving the strength of intermetallic compounds at both room temperature and high temperatures.

关键词： TiAl alloys Strengthening Gradient grain Additive manufacturing Molecular dynamics

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Interfacial electronic coupling of V-doped Co_(2)P with high-entropy MXene reduces kinetic energy barrier for efficient overall water splitting

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Journal of Energy Chemistry 2023年第10期85卷 301-309,I0009页

作者： Wansen Ma Zeming Qiu Jinzhou Li Liwen Hu Qian Li Xuewei Lv Jie Dang College of Materials Science and Engineering Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New MaterialsChongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China State Key Laboratory of Advanced Special Steels&Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

Developing efficient,low-cost non-noble metal-based bifunctional catalysts to achieve excellent hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)kinetics in alkaline media is challenging but very ***,improving the electronic structure of the catalyst to optimize the adsorption of intermediates and reduce the reaction energy barrier is the key to improve the reaction ***,a V-doped Co_(2)P coupled with high-entropy MXene heterostructure catalyst(V-Co_(2)P@HE)was prepared by a two-step electrodeposition and controlled phosphorization *** analyses of X-ray absorption spectroscopy,X-ray photoelectron spectroscopy and theoretical calculations jointly show that the introduction of V and the strong electron coupling between the two components optimize the adsorption energy of water molecules and reaction *** from the abundant active sites and optimizing intermediate adsorption energy and heterogeneous interface electronic structure,V-Co_(2)P@HE has excellent HER and OER activity and long-term stability under alkaline *** particular,when assembled as cathode and anode,the bifunctional V-Co_(2)P@HE catalyst can drive a current density of 10 mA cm^(-2)with only 1.53 *** work provides new strategies for the application of highentropy MXene and the design of novel non-noble metal-based bifunctional electrolytic water catalysts.

关键词： Transition metal phosphides High-entropy MXene HER OER

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Highly-chlorinated inert and robust interphase without mineralization of oxide enhancing high-rate Li metal batteries

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Chinese Chemical Letters 2024年第6期35卷 239-243页

作者： Long Li Kang Yang Chenpeng Xi Mengchao Li Borong Li Gui Xu Yuanbin Xiao Xiancai Cui Zhiliang Liu Lingyun Li Yan Yu Chengkai Yang Key Laboratory of Advanced Materials Technologies International(HongKong Macao and Taiwan)Joint Laboratory on Advanced Materials TechnologiesSchool of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China College of Material Sciences and Chemical Engineering Harbin Engineering UniversityHarbin 150001China

Side reactions and dendrite growth triggered by the unstable interface and inhomogeneous deposition have become the biggest obstacle to the commercialization for lithium metal *** this study,a highly-chlorinated organic-inorganic hybrid interfacial protective layer is developed by rationally tuning the interfacial passivation and robustness to achieve the convenient and efficient Li metal *** polyvinyl chloride(PVC)can effectively resist water and oxygen,which is confirmed by density functional *** organic-dominant solid electrolyte interphases(SEI)with lithium chloride are investigated by the X-ray photoelectron spectroscopy(XPS)with little mineralization of oxide,such as Li_(2)O and Li_(2)CO_(3).With such artificial SEI,a uniform and dense lithium deposition morphology are formed and an ultra-long stable cycle of over 500 h are achieved even at an ultra-high current density of 10 m A/cm^(2).Moreover,the simple and convenient protected anode also exhibits excellent battery stability when paired with the LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)and LiFePO_(4)(LFP)cathode,showing great potential for the commercial application of lithium metal batteries.

关键词： Highly-chlorinated Water/oxygen resistance Stable interphase Dendrite-free lithium metal batteries High-rate

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Curing the vulnerable heterointerface via organic-inorganic hybrid hole transporting bilayers for efficient inverted perovskite solar cells

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Chinese Chemical Letters 2024年第6期35卷 254-257页

作者： Kangrong Yan Ziqiu Shen Yanchun Huang Benfang Niu Hongzheng Chen Chang-Zhi Li State Key Laboratory of Silicon and Advanced Semiconductor Materials Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

To promote the practices of perovskite photovoltaics,it requires to develop efficient perovskite solar cells(PVSCs)standing long-time operation under the adverse ***,we demonstrate that the tailor-made conjugated polymers as conductive adhesives stabilized the originally redox-reactive heterointerface between perovskite and metal oxide,facilitating the access of efficient and stable inverted *** was revealed that bithiophene and phenyl alternating conjugated polymers with partial glycol chains atop of the metal oxide layer has resulted in effective organic-inorganic hybrid hole transporting bilayers,which allow maintaining efficient hole extraction and transport,meanwhile preventing halide migration to directly contact with the nickel oxide(NiO_(x))*** a result,the corresponding inverted PVSCs with the organic-inorganic hole transporting bilayers have achieved an excellent power conversion efficiency of 23.22%,outperforming 20.65% of bare NiO_(x)-based ***,the encapsulated PVSCs with organic-inorganic bilayers exhibited the excellent photostability with 91% of the initial efficiency after 1000-h one-sun equivalent illumination in ambient ***,this work provides new insights into stabilizing the vulnerable heterointerface for perovskite solar cells.

关键词： Perovskite solar cells Conjugated polymer Hole transporting bilayer Charge extraction Heterointerface degradation

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Atomic-scale investigation of precipitate phases in QE22 Mg alloy

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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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