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Rare-earth-niobate high-entropy ceramic foams with enhanced thermal insulation performance

journal of materials Science & Technology 2022年第21期116卷 94-102页

作者： R.W.Yang Y.P.Liang j.xu x.Y.meng j.T.Zhu S.Y.Cao m.Y.Wei R.x.Zhang j.L.Yang f.Gao State Key Laboratory of Solidification Processing MIIT Key Laboratory of Radiation Detection Materials and DevicesSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an710072China NPU-QmUL joint Research Institute of Advanced materials and Structure Northwestern Polytechnical UniversityXi’an710072China State Key Laboratory of New Ceramics and fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China State Key Laboratory of materials Processing and Die&mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China

The introduction of porous structures into high-entropy ceramics is expected to further improve its thermal insulation *** this work,a series of novel rare-earth-niobate high-entropy ceramic foams((Dy_(0.2)Ho_(0.2)Y_(0.2)Er_(0.2)Yb_(0.2))_(3)NbO_(7))with hierarchical pore structures were prepared by a particle-stabilized foaming ***-scale analysis reveals that high entropy causes atom displacement and lattice *** high-entropy ceramic foams exhibit high porosity(90.13%-96.13%)and ultralow thermal conductivity(0.0343-0.0592 W/(m·K))at room ***-entropy ceramic foam prepared by a 20 wt%slurry sintered at 1500℃has the porosity of 96.12%and extremely low thermal conductivity of 0.0343 W/(m·K).The existence of walls and secondary pores contributes to reduced thermal *** is a temperature difference of over 800℃between frontside and backside of the sample under fire resistance *** research indicates that these as-prepared high-entropy ceramic foams are expected to be promising thermal insulation materials.

关键词： Rare-earth niobate High-entropy ceramic foams Particle-stabilized foaming Atomic-scale analysis Thermal conductivity

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Design and optimization of the composition and mechanical properties for non-equiatomic CoCrNi medium-entropy alloys

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journal of materials Science & Technology 2023年第8期139卷 232-244页

作者： j.x.Yan Z.j.Zhang P.Zhang j.H.Liu H.Yu Q.m.Hu j.B.Yang Z.f.Zhang Shi-changxu Innovation Center for Advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials Science and Engineering Chongqing Jiaotong UniversityChongqing 400074China chool of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of materials Science and Engineering Northeastern UniversityShenyang 110819China School of Information Science and Engineering Shenyang University of TechnologyShenyang 111003China

The development of multi-principal element alloys(mPEAs,also called as high-or medium-entropy al-loys,HEAs/mEAs)provides tremendous possibilities for materials ***,designing mPEAs with desirable mechanical properties confronts great challenges due to their vast composition *** this work,we provide an essential criterion to efficiently screen the CoCrNi mEAs with outstanding strength-ductility *** negative Gibbs free energy difference△E_(fCC-BCC)between the face-centered cubic(fCC)and body-centered cubic(BCC)phases,the enhancement of shear modulus G and the decline of stacking fault energy(SfE)γ_(isf)are combined as three requisites to improve the fCC phase stability,yield strength,deformation mechanisms,work-hardening ability and ductility in the *** effects of chemical composition on△E_(fCC-BCC),G andγisf were investigated with the first principles calculations for Co_(x)Cr_(33)Ni_(67-x),Co_(33)Cr_(y)Ni_(67-y)and Co_(z)Cr_(66-z)Ni_(34)(0≤x,y≤67 and 0≤z≤66)*** on the essential criterion and the calculation results,the composition space that displays the neg-ative Gibbs free energy difference△E_(fCC-BCC),highest shear modulus G and lowest SfEγ_(isf)was screened with the target on the combination of high strength and excellent *** this context,the optimal composition space of Co-Cr-Ni alloys was predicted as 60 at.%-67 at.%Co,30 at.%-35 at.%Cr and 0 at.%-6 at.%Ni,which coincides well with the previous experimental evidence for Co_(55)Cr_(40)Ni_(5)*** valid-ity of essential criterion is further proved after systematic comparison with numerous experimental data,which demonstrates that the essential criterion can provide significant guidance for the quick exploitation of strong and ductile mEAs and promote the development and application of mPEAs.

关键词： medium-entropy alloys first-principles calculations Phase stability Stacking-fault energy Strength Ductility

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mechanism transition of cross slip with stress and temperature in face-centered cubic metals

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journal of materials Science & Technology 2020年第22期54卷 159-171页

作者： K.Q.Li Z.j.Zhang j.x.Yan j.B.Yang Z.f.Zhang Laboratory of fatigue and fracture for materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

A/2 screw dislocation is commonly dissociated into two /6 Shockley partial dislocations on{111} planes in face-centered cubic *** the two partials are not purely screw,different mechanisms of cross-slip could take place,depending on the stacking fault energy,applied stress and tempe *** is crucial to classify the mechanisms of cross-slip because each mechanism possesses its own reaction path with a special activation *** this work,molecular dynamics simulations have been performed systematically to explore the cross-slip mechanism under different stresses and temperatures in three different metals Ag,Cu and Ni that have different stacking fault energies of 17.8,44.4 and 126.8 mj/m^2,re *** Ag and Cu with low stacking fault energy,it is observed that the cross-slip mechanism of screw dislocations changes from the fleischer obtuse angle(fLOA),to the friedel-Escaig(fE),and then to the fL acute angle(fLAA) at low temperatures,with increasing the applied ***,when the temperature increases,the fE mechanism gradually becomes dominant,while the fLAA only occurs at the high stress *** particular,the fLOA has not been observed in Ni because of its high stacking fault energy.

关键词： Cross-slip molecular dynamics simulation face-centered cubic metals Stacking fault energy

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micro injection of metallic glasses parts under ultrasonic vibration

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journal of materials Science & Technology 2017年第7期33卷 703-707页

作者： x.Liang j.ma x.Y.Wu B.xu f.Gong j.G.Lei T.j.Peng R.Cheng Guangdong Provincial Key Laboratory ofmicro/Nano Optomechatronics Engineering College of Mechatronics and Control and Engineering Shenzhen University Shenzhen 518060 China Shenzhen ESUN Exhibition Company Limited Shenzhen 518048. China

This work investigates the evolution of structure and mechanical performance of metallic glasses（mGs）under a proposed rapid forming approach. Through the unique ultrasonic-assisted micro injection method, micro mGs parts with fine dimensional accuracy were successfully fabricated. The temperature during the micro injection is higher than the glass transition temperature and lower than the crystallization temperature. Differential scanning calorimeter curve and x-ray diffraction pattern show that the mGs micro parts keep the amorphous nature after the ultrasonic-assisted micro injection. Our results propose a novel route for the fast forming of mGs and have promising applications in the rapid fabrication of micro scale products and devices.

关键词： metallic glasses micro injection Ultrasonic vibration

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The NUBASE2012 evaluation of nuclear properties

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Chinese Physics C 2012年第12期36卷 1157-1286页

作者： G.Audi f.G.Kondev m.Wang B.Pfeiffer x.Sun j.Blachot m.macCormick Centre de Spectrométrie Nucléaire et de Spectrométrie de masse CSNSMCNRS/IN2P3Universlte Paris-SudBat.108F-91405 Orsay CampusFrance Argonne National Laboratory 9700 S.Cass AvenueArgonneIL 60439USA max-Planck-Institut fur Kernphysik Saupfercheckweg 1D-69117 HeidelbergGermany Institute of modem Physics CAS509 Nanchang Rd.Lanzhou 730000China GSI Helmholtzzentrum fur Schwerionenforschung Planckstr.1D-64291 DarmstadtGermany Institut de Physique Nucléaire CNRS/IN2P3Universite Paris-SudF-91406 Orsay cedexFrance

This paper presents the NUBASE2012 evaluation that contains the recommended values for nuclear and decay properties of nuclides in their ground and excited isomeric （T1/2≥ 100 ns） states. All nuclides for which some experimental information is known are considered. NUBASE2012 covers all up to date experimental data published in primary （journal articles） and secondary （mainly laboratory reports and conference proceedings） references, together with the corresponding bibliographical information. During the development of NUBASE2012, the data available in the ＂Evaluated Nuclear Structure Data file＂（ENSDf） database were consulted, and critically assessed of their validity and completeness. furthermore, a large amount of new and somewhat older experimental results that were missing in ENSDf were compiled, evaluated and included in NUI3ASE2012. The atomic mass values were taken from the ＂Atomic mass Evaluation＂（AmE2012, second and third parts of the present issue）. In cases where no experimental data were available for a particular nuclide, trends in the behavior of specific properties in neighboring nuclei （TNN） were examined. This approach allowed to estimate, whenever possible, values for a range of properties, and are labeled in NUBASE2012 as ＂non-experimental＂（flagged ＂#＂）. Evaluation procedures and policies that were used during the development of this database are presented, together with a detailed table of recommended values and their uncertainties.

关键词： IT Ru The NUBASE2012 evaluation of nuclear properties

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Improvement of Coercivity and Corrosion Resistance of Nd-fe-B Sintered magnets with Cu Nano-particles Doping

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journal of materials Science & Technology 2012年第10期28卷 927-930页

作者： C.Sun W.Q.Liu H.Sun m.Yue x.f.Yi j.W.Chen College of materials Science and Engineering Beijing University of TechnologyBeijing 100124China Earth-panda Advance magnetic material Co. Ltd.Anhui 231500China

Nd-fe-B permanent magnets with a small amount of Cu nano-particles doping have been prepared by con-ventional sintered method. Effects of Cu content on magnetic properties, corrosion resistance, and oxidation properties of the magnets have been studied. It shows that the coercivity rises gradually, while the remanence decreases simultaneously with increasing Cu doping amount. microstructure observation reveals that Cu ele- ment enriches mainly the Nd-rich phase. Autoclave test results show that the corrosion rate of the magnets decreases with increasing Cu content. After oxidation, the maximum energy product loss of the magnets with 0 and 0.2 wt% Cu nano-particles doping are 6.13% and 0.g9%, respectively. Therefore, it is concluded that Cu nano-particles doping is a promising way to enhance the coercivity and corrosion resistance of sintered Nd-fe-B magnets.

关键词： Nd-fe-B Cu nano-particles Coercivity Corrosion resistance Oxidation

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Preparation of Ga_2O_3 thin film solar-blind photodetectors based on mixed-phase structure by pulsed laser deposition

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Chinese Physics B 2019年第1期28卷 171-177页

作者： Y m Lu C Li x H Chen S Han P j Cao f jia Y x Zeng x K Liu W Y xu W j Liu D L Zhu College of materials Science and Engineering Shenzhen Key Laboratory of Special Functional MaterialsShenzhen Engineering Laboratory for Advanced Technology of CeramicsGuangdong Research Center for Interfacial Engineering of Functional MaterialsShenzhen UniversityShenzhen 518060China

Gallium oxide(Ga_2O_3) thin films were deposited on a-Al2O3(1120) substrates by pulsed laser deposition(PLD) with different oxygen pressures at 650?C. By reducing the oxygen pressure, mixed-phase Ga_2O_3 films with α and β phases can be obtained, and on the basis of this, mixed-phase Ga_2O_3 thin film solar-blind photodetectors(SBPDs) were *** the responsivities of the mixed-phase Ga_2O_3 SBPDs and the single β-Ga_2O_3 SBPDs at a bias voltage of 25 V,it is found that the former has a maximum responsivity of approximately 12 A/W, which is approximately two orders of magnitude larger than that of the latter. This result shows that the mixed-phase structure of Ga_2O_3 thin films can be used to prepare high-responsivity SBPDs. moreover, the cause of this phenomenon was investigated, which will provide a feasible way to improve the responsivity of Ga_2O_3 thin film SBPDs.

关键词： Ga2O3 mixed-phase solar-blind photodetector pulsed laser deposition

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Near zero thermal performance loss of Al-Si microcapsules with fibers network emb e dde d Al_(2)O_(3)/AlN shell

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journal of materials Science & Technology 2024年第9期176卷 48-56页

作者： j.x.Zhang m.j.Zhang H.f.Li H.Z.Gu D.Chen C.H.Zhang Y.f.Tian E.j.Wang Q.N.mu The State Key Laboratory of Refractories and metallurgy(Wuhan University of Science and Technology) Wuhan 430081China faculty of materials Science and Chemistry Engineering Research Center of Nano-Geomaterials of Ministry of EducationChina University of GeosciencesWuhan 430078China Henan Shenma Carbon Reduction Technology Co. LtdPingdingshan 467000China

Al-Si alloy,a high temperature phase change material,has great potential in thermal management due to its advantages of high heat storage density and thermal *** of Al-Si alloy is one of the effective techniques to solve high temperature leakage and *** this paper,commercial Al-10Si alloy micro powders were encapsulated with flexible ceramic shells whose total thickness is below 1μm by hydrothermal treatment and heat treatment in N_(2) *** compositions and microstructures were characterized by xRD,SEm and *** shell was composed of AlN fibers network structure embedded withα-Al_(2)O_(3)/AlN which prevented the alloy from leaking and oxidizing,as well as had excellent thermal *** latent heat of microcapsules was 351.8 j g^(-1)for absorption and 372.7 j g^(-1)for *** microcapsules showed near zero thermal performance loss with latent heat storage(LHS)/release(LHR)was 353.2/403.7 j g^(-1)after 3000 *** with the published Al-Si alloy microcapsules,both high heat storage density and super thermal cycle stability were achieved,showing promising development prospects in high temperature thermal management.

关键词： Al-Si alloy microcapsules Ceramic shell AlN fiber network Thermal performance

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PARTICLE SIZE AND mICROSTRUCTURE Of Ni NANOPOWDERS PREPARED BY ANODIC ARC PLASmA

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Acta metallurgica Sinica(English Letters) 2005年第3期18卷 209-216页

作者： Z.Q.Wei H.x.Qiao j.f.Dai W.j.feng Q.Wang P.x.Yan SchoolofSciences LanzhouUniversityofTechnologyLanzhou730050China CollegeofCivilEngineering LanzhouUniversityofTechnologyLanzhou730050China SchoolofPhysicalScienceandTechnology LanzhouUniversityLanzhou730000China

Pure Ni nanopowders were successfully prepared by the method of anodic arc disch arged plasma with homemade experimental apparatus. The particle size, mircostruc ture and morphology of the particles by this process were characterized via x-ra y powder diffraction (xRD), transmission electron microscopy (TEm) and the corre sponding selected area electron diffraction (SAED); The specific surface area an d pore parameters were investigated by multi-point full analysis of nitrogen ads orption-desorption isotherms at 77K by Brunauer- Emmett-Teller (BET) surface are a analyzer; The chemical composition were determined by x-ray energy dispersive spectrometry (xEDS) equipped in SEm and element analyze instrument. The experime nt results indicate that the samples by this method with high purity,the crystal structure of the particles is as same as the bulk material, is fcc structure, w ith average particle sizes about 47nm, ranging from 20 to 70nm, and distributed uniformly in spherical chain shapes, the specific surface areavis 14.23m2/g, po re volume of pore is 0.09cm3/g and average pore diameter is 23nm.

关键词： anodic arc plasma Ni nanopowder particle size structure composition.

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GO/mgO/mg interface mediated strengthening and electromagnetic interference shielding in AZ31 composite

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journal of magnesium and Alloys 2023年第10期11卷 3800-3814页

作者： Z.Y.xu C.f.fang C.j.Li R.Wang x.P.Zhang j.Tan Y.m.Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China faculty of materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China College of materials Science and Engineering Chongqing UniversityChongqing 400045China Key Laboratory of materials modification by Laser Ion and Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian 116023China

more requirements of electromagnetic interference(EmI) shielding performance are put forward for lightweight structural materials due to the development of aerospace and 5G communications. Herein, graphene oxide(GO) decorated with SnO_(2) coating is introduced as reinforcement into AZ31 mg alloy. During the smelting process, the mgO layer is in situ gernerated at interface between GO and the molten mg alloy matrix by consuming SnO_(2). In the solid state, such kind of interface structure can improve the GO-mg interface bonding intensity,also significantly generate stacking faults. The AZ31 composite reinfoced by trace modified GO(0.1 wt%) exhibits high ultimate strength and almost the same elongation with AZ31 alloy. Compared with AZ31 alloy, the yield strength and ultimate tensile strength of composite are increased by 33.5% and 23.7%, respectively. meanwhile, the multi-level electromagnetic reflection from the multi-layer structure of GO and the interface polarization caused by the mgO mid-layer can significantly improve EmI shielding performance. The appropriate interface design strategy achieves the effect of “two birds with one stone”.

关键词： metal-matrix composites mechanical properties EmI shielding microstructures

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