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Intrinsic multiferroicity in molybdenum oxytrihalides nanowires

npj Computational materials 2024年第1期10卷 1310-1317页

作者： Chao Yang Yin Wang Menghao Wu Tai Min Center for Spintronics and Quantum Systems State Key Laboratory for Mechanical Behavior of MaterialsSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an710049China Department of Physics International Center for Quantum and Molecular StructuresShanghai UniversityShanghai200444China School of Physics Huazhong University of Science and TechnologyWuhan430074China School of Materials Science and Intelligent Engineering Nanjing UniversitySuzhou215163China

Low-dimensional multiferroics,which simultaneously possess at least two primary ferroic order parameters,hold great promise for post-Moore electronic ***,intrinsic onedimensional(1D)multiferroics with the coexistence of ferroelectricity and ferromagnetism are still yet to be realized,which will be not only crucial for exploring the interplay between low-dimensionality and ferroelectric/ferromagnetic ordering but also significant in rendering application approaches for high density information technologies.

关键词： nanowires ferroelectric rendering

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Thermal stability and deformation mechanisms in Ni-Co-Fe-Cr-Al-Ti-Nb-type nanoparticle-strengthened high-entropy alloys

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Journal of materials science & Technology 2023年第36期167卷 171-183页

作者： J.X.Hou J.Y.Zhang J.X.Zhang J.H.Luan Y.X.Wang B.X.Cao Y.L.Zhao Z.B.Jiao X.J.Liu W.W.Song P.K.Liaw T.Yang Department of Materials Science and Engineering Hong Kong Institute for Advanced StudyCity University of Hong KongHong KongChina School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina Steel Institute RWTH Aachen UniversityAachen 52072Germany Institute of Materials Engineering University of KasselKassel 334125Germany Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996-2200USA City University of Hong Kong China

The precipitate morphologies,coarsening kinetics,elemental partitioning behaviors,grain structures,and tensile properties were explored in detail for L1_(2)-strengthened Ni_(39.9)Co_(20)Fe_(15)Cr_(15)Al_(6)Ti_(4-x)Nb_(x)B_(0.1)(x=0 at.%,2 at.%,and 4 at.%)high-entropy alloys(HEAs).By substituting Ti with Nb,the spheroidal-to-cuboidal precipitate morphological transition,increase in the coarsening kinetics,and phase decomposition upon aging at 800°C *** excessive addition of Nb brings about the grain boundary precipitation of an Nb-rich phase along with the phase decomposition from the L1_(2)to lamellar-structured D019 phase upon the long-term aging *** partially substituting Ti with Nb,the chemically complex and thermally stable L12 phase with a composition of(Ni_(58.8)Co_(9.8)Fe_(2.7))(Al_(12.7)Ti_(5.8)Nb_(7.5)Cr_(2.3))ensures the stable phase structure and clean grain boundaries,which guarantees the superb high-temperature mechanical properties(791±7 MPa for yielding and 1013±11 MPa for failure)at 700℃.Stacking faults(SFs)were observed to prevail during the plastic deformation,offering a high work-hardening capability at 700°*** anomalous rise in the yield strength at 800℃was found,which could be ascribed to the multi-layered super-partial dislocations with a cross-slip configuration within the L1_(2)particles.

关键词： High-entropy alloys Coarsening kinetics Coherent precipitation strengthening mechanical properties

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Bioinspired nanocomposites with self-adaptive mechanical properties

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Nano Research 2024年第2期17卷 633-648页

作者： Grant Kitchen Bohan Sun Sung Hoon Kang 13400 N Charles St Department of Materials Science and EngineeringJohns Hopkins UniversityBaltimore 21218USA 23400 N Charles St Department of Mechanical EngineeringJohns Hopkins UniversityBaltimore 21218USA 33400 N Charles St Hopkins Extreme Materials InstituteJohns Hopkins UniversityBaltimore 21218USA

Conventional synthetic materials have fixed mechanical properties and suffer defects,damage,and degradation over *** makes them unable to adapt to changing environments and leads to limited ***,self-adaptive materials inspired by natural materials have emerged as a solution to address these *** the ability to change their mechanical properties based on changing mechanical environments,repairing defects,and maintaining their mechanical properties,these materials can lead to improved performance while decreasing *** this review,we explore self-adaptive phenomena found in nature that have inspired the development of synthetic self-adaptive materials,and the mechanisms that have been employed to create the next generation of *** potential applications of these materials,the challenges that existing approaches face,and future research opportunities are also discussed.

关键词： nanocomposites self-adaptive materials bioinspired materials force-activated resilience

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In-situ HRTEM observations of intermediate phase transformation in lattice reorientation in HCP rhenium

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材料科学技术（英文版） 2025年第3期206卷 15-25页

作者： Yang He Zhengwu Fang Bin Li Chongmin Wang Scott X.Mao Department of Mechanical Engineering and Materials Science University of PittsburghPittsburghPA 15261USA Department of Industrial and Manufacturing Systems Engineering Iowa State UniversityAmesIA 50011USA Environmental Molecular Sciences Laboratory Pacific Northwest National LaboratoryRichlandWashington 99352USA

In-situ high-resolution transmission electron microscopy(HRTEM)is performed to investigate the de-formation behavior of hexagonal close-packed rhenium(Re)which is compressed along the<1(1)00>*** simulations are also conducted to better understand the deformation *** types of lattice reorientation are observed during *** first type involves the reori-entation of one lattice by～90° around<11(2)0>,which is accomplished by the formation of an interme-diate face-center-cubic(FCC)phase at the *** transformation sequence can be described as{1(1)00}matrix →{111}FCC →(0001)*** the second type,a new grain is formed but does not satisfy any known twin relationship with the matrix,and an intermediate FCC phase is also *** transfor-mation sequence can be described as{1(1)01}matrix →{111｝FCC →(0001)*** responsible for the observed lattice reorientation and sequential phase transitions are analyzed by conducting lattice correspondence analyses on the simulation *** accommodation is also analyzed to explain the mechanisms for lattice reorientation and the intermediate phase *** results provide new insight into the deformation behavior of HCP metals.

关键词： Lattice reorientation Phase transformation Lattice correspondence

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Understanding pit initiation of pipeline steel X100 under cathodic protection potential fluctuating with various duty cycles

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Corrosion Communications 2023年第4期12卷 11-18页

作者： Mingjie Dai Y.Frank Cheng Zhen Wang Feng Huang Qian Hu Jing Liu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Hubei Engineering Technology Research Center of Materials and Service Safety Wuhan University of Science and Technology Department of Mechanical Engineering University of Calgary College of Materials Science and Engineering Shenzhen University

The square wave polarisation technique and mathematical/electrochemical models were combined to investigate pitting corrosion of pipeline steel X100 under cathodic protection potential fluctuations with different duty cycles（δ）. Mathematical equations were derived to describe the increased potential of the double-charge layer at the steel/solution interface, which increases density from 1100 mm-2（δ = 10%） to over 6600 mm-2（δ = 50%）. However, an electrochemical model was developed to present the formation of an amorphous corrosion product layer,which reduces the number of local anodic corrosion areas and decreases pitting density when δ is higher than 50%.

关键词： Pipeline steel X100 Cathodic protection Duty cycle Pitting corrosion

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Slip-band-driven dynamic recrystallization mediated strain hardening in HfNbTaTiZr refractory high entropy alloy

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材料科学技术（英文版） 2025年第6期209卷 240-250页

作者： Long Xu Yuefei Jia Yueli Ma Yandong Jia Shiwei Wu Chao Chen Hongyu Ding Jieren Guan Xinfeng Kan Rui Wang Gang Wang Marine Equipment and Technology Institute Jiangsu University of Science and TechnologyZhenjiang 212003China Institute of Materials Shanghai UniversityShanghai 200444China Department of Mechanical Engineering National University of SingaporeSingapore 117575Singapore

Refractory high-entropy alloys(RHEAs)exhibit outstanding strength at room temperature,but their high-temperature applications are hindered by severe ***,we report slip-band-driven dy-namic recrystallization to enhance the high-temperature strain hardening of HfNbTaTiZr *** intro-ducing partial lattice defects through hot forging,we increase the nucleation sites for dynamic recrys-tallization during subsequent thermomechanical deformation,thus suppressing the strain-softening *** reveal that the high-temperature deformation is governed by the formation of heterogeneous bimodal grains along slip bands,which effectively constrain dislocation motion and improve strength,while microbands prevent premature *** fracture mode also changes from ductile to mixed to cleavage-dominated with increasing *** results demonstrate a simple and effective method for overcoming high-temperature strain-softening for BCC high entropy alloys.

关键词： Refractory high-entropy alloy High-temperature strain-softening Slip band Recrystallization

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Local-distortion-informed exceptional multicomponent transition-metal carbides uncovered by machine learning

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npj Computational materials 2024年第1期10卷 1576-1585页

作者： Jun Zhang Liu He Yaoxu Xiong Shasha Huang Biao Xu Shihua Ma Xuepeng Xiang Haijun Fu Jijung Kai Zhenggang Wu Shijun Zhao Department of Mechanical Engineering City University of Hong KongHong KongChina College of Materials Science and Engineering Hunan UniversityChangshaHunan410082China Hong Kong Institute for Advanced Study City University of Hong KongHong KongChina

Developing high-performance multicomponent ceramics,which are promising in solving challenges posed by emerging technologies,shows grand difficulties because of the immense compositional space and complex local *** this work,an accurate machine learning(ML)model built upon an ab initio database is developed to predict the mechanical properties and structural distortions of multicomponent transition metal carbides(MTMCs).

关键词： carbides distortion multicomponent

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Understanding the Thermal Impedance of Silicone Rubber/Hexagonal Boron Nitride Composites as Thermal Interface materials

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Chinese Journal of Polymer science 2024年第3期42卷 352-363,I0008页

作者： Yuan Ji Shi-Da Han Hong Wu Shao-Yun Guo Feng-Shun Zhang Jian-Hui Qiu The State Key Laboratory of Polymer Materials Engineering Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing TechnologyPolymer Research InstituteSichuan UniversityChengdu 610065China Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China Department of Mechanical Engineering Faculty of Systems Science and TechnologyAkita Prefectural UniversityAkita 015-0055Japan

Silicone rubber(SR) composites are most widely used as thermal interface materials(TIMs) for electronics heat dissipation. Thermal impedance as the main bottleneck limiting the performance of TIMs is usually neglected. Herein, the thermal impedance of SR composites loaded with different levels of hexagonal boron nitride(h-BN) as TIMs was elaborated for the first time by the ASTM D 5470 standard test and finite element analysis. It was found that elastic modulus and surface roughness of SR composites increased with the increase of h-BN content, indicating that the conformity was reduced. When the assembly pressure was 0.69 MPa, there existed an optimal h-BN content at which the contact resistance was minimum(0.39 K·cm^(2)·W^(-1)). Although the decreased bond line thickness(BLT) by increasing the assembly pressure was beneficial to reduce the thermal impedance, the proper assembly pressure should be selected to prevent the warpage of the contact surfaces and the increase in contact resistance, according to the compression properties of the SR composites. This study provides valuable insights into fabrication of high-performance TIMs for modern electronic device applications.

关键词： Thermal interface materials Hexagonal boron nitride Thermal impedance Surfaces

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Intermittent oxidation kinetics and metal/oxide interfacial undulation

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Physical Review B 2024年第8期110卷 085402-085402页

作者： Dongxiang Wu Xianhu Sun Judith C. Yang Guangwen Zhou Department of Mechanical Engineering & Materials Science and Engineering Program Department of Chemical and Petroleum Engineering

The phenomenon of oxygen adsorption induced surface restructuring is widespread across various metal-oxygen systems, yet its impact on initiating bulk oxide formation remains largely unexplored. Through in situ atomic-resolution electron microscopy observations of surface oxidation of Cu(110) and Cu85Au15(110), we unveil intermittent oxide-film growth modulated by oxygen-induced surface restructuring. This modulation is evidenced by repeated pinning of the Cu2O growth front at isolated Cu columns of the c(6×2)-O reconstruction, owing to required long-range diffusion of Cu and O atoms to the Cu2O growth front. We reveal that Cu vacancies, generated at the Cu2O growth front, are injected into the Cu2O/Cu interface, inducing hill and valley undulation of the Cu2O film. In contrast, atomic vacancies produced during the Cu85Au15(110) oxidation preferentially migrate into interfaces between Au-rich and Au-poor regions in the bulk, resulting in a flat and adherent Cu2O film. These findings demonstrate the critical role of oxygen-induced surface restructuring in modulating oxide film growth kinetics and the manipulability of the fate of injected vacancies by alloying, thereby offering insights applicable to a broader range of metal-oxygen systems for fine-tuning oxidation kinetics and enhancing oxide/metal interfacial adhesion.

关键词： Surface & interfacial phenomena Surface reconstruction Surface growth Density functional theory Transmission electron microscopy

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A high-performance degradable Mg alloy suturing staple for single-arm oral stapling robot

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Journal of Magnesium and Alloys 2024年第10期12卷 4096-4118页

作者： Q.H.Wang S.S.Liang F.S.Yuan B.Y.Liu J.Z.Yu W.Wang N.Fakhar H.X.Li State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Center of Digital Dentistry Peking University Hospital of StomatologyBeijing 100081China College of Engineering Peking UniversityBeijing 100871China School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Mechanical Engineering Department Hamedan University of TechnologyHamedanIran

Minimally invasive surgery(MIS)robots,such as single-arm stapling robots,are key to oral and maxillofacial surgery because they overcome space constraints in the oral cavity and deep ***,biodegradable suture staples should be developed for the single-arm stapling robots to avoid a secondary *** this aim,a new type of Mg-3Zn-0.2Ca-2Ag biodegradable alloy wire was developed in this study applied as suture *** tensile strength,yield strength,and elongation are 326.1 MPa,314.5 MPa,and 19.6%,***,the alloy wire attains the highest yield strength value reported among all the biodegradable Mg wires,which is mainly attributed to fine grain strengthening and second phase strengthening such as Mg_(2)Zn_(11) nano phase ***,the corrosion rate of this alloy wire in simulated body fluid(SBF)reaches 26.8 mm/y,the highest value among all the biodegradable Mg alloy wires reported so far,which is mainly from the intensified galvanic corrosion between the Ag17Mg54 phase and the Mg *** vitro studies demonstrate that the alloy wire exhibits good blood compatibility and low *** cone beam computed tomography(CBCT)data shows that the suture staple made of the Mg alloy wire provides better mechanical support in the early postoperative *** the single arm robot tests,it confirms that suture staples can close the wound tightly and remain stable over *** research provides a good material selection for the automated suturing in oral and throat surgery robots.

关键词： Biodegradable Mg alloy Suture staples mechanical properties Micro-galvanic corrosion Biocompatibility.

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