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Insights into the microstructural design of high-performance Ti alloys for laser powder bed fusion by tailoring columnar prior-βgrains andα-Ti morphology

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journal of materials Science & Technology 2024年第20期187卷 156-168页

作者： S.x.Wang S.f.Li x.m.Gan R.D.K.misra R.Zheng K.Kondoh Y.f.Yang State Key Laboratory of multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Science and Technology on Particle materials Chinese Academy of SciencesBeijing 100190China Department of metallurgical Materials and Biomedical EngineeringUniversity of TexasEl Paso TX 79968USA joining and Welding Research Institution Osaka University11-1 MihogaokaIbarakiOsaka 567-0047Japan

A high-performance Ti-Ni-B alloy with good tensile properties and reduced mechanical anisotropy was developed by promoting the columnar to equiaxed transition(CET)of prior-βgrains and modifyingα-laths to equiaxed *** Ni and B contributed to the refinement of columnar prior-βgrains during the L→βphase transformation by generating constitutional *** with Ni,B had a su-perior capability of generating constitutional undercooling,which not only replaced a significant amount of Ni with a minor addition to reduce the formation of brittle eutectoid,but also reacted with Ti to form TiB to promote heterogeneous nucleation ofα-Ti grains during theβ→αphase *** with the restricted growth ofα-laths induced by the refinement of prior-βgrains,a fully equiaxedα-Ti structure was *** competition between the negative effect of brittle eutectoid and the positive role ofα-lath to equiaxed grain transition on the ductility of as-printed Ti-Ni-B alloys was fundamen-tally governed by the morphology of eutectoid and technically dependent on the Ni-B *** the addition was 1.2Ni-0.06B(wt.%)or less,the positive effect ofα-lath on equiaxed grain transition can effectively mitigate the issue of reduced ductility caused by brittle *** contrast,at 1.8Ni-0.09B or greater,the negative effect of eutectoid *** insights into microstructural design obtained through the aforementioned approach were presented and discussed.

关键词： Laser powder bed fusion Titanium alloys Grain refinement Powder processing Anisotropy

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

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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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Cadmium sulfide cage photocatalysis coupled electroactive biofilm for synergistic promotion of tetracycline degradation and electricity production

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journal of materials Science & Technology 2023年第35期166卷 86-97页

作者： Z.S.Yuan j.x.Zou x.L.Zhao j.Y.Shi C.S.Guo m.Yan School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China

Tetracycline(TC)as a common broad-spectrum antibiotic,has been frequently detected in soil and sur-face *** becomes a great threat to the ecological ***,a device of photocatalysis as-sisted microbial fuel cell(photo-mfC)was constructed for TC degradation and energy *** this photo-mfC,cadmium sulfide(CdS)cage photocatalysis can degrade most of TC in a short *** the Co_(3)O_(4)@C-CC(carbonization and calcination of the ZIf-67 precursor in-situ grown on the carbon cloth(CC))bioanode degrades the rest of TC as well as the photocatalytic products,thus improving the *** co-existence of photocatalysis with bioanode changes the microbial community structure of the *** dominant phylum is Geobacter(60.2%)in normal mfC while that in photo-mfC are Pro-teobacteria(43.5%)and Geobacter(33.2%).Therefore,the synergistic effect of photocatalytic degradation and biodegradation achieves a chemical oxygen demand(COD)removal of 98.6%,which is higher than that of normal mfC(77.6%)or single CdS cage photocatalysis(23.8%).In addition,the photogenerated electrons can be transferred to the cathode,which reduces their combination with holes and increases the electricity generation of mfC,achieving a maximum power density of 3.37 W/m^(2).After degradation,the effluent with 200 mg L^(−1) TC exhibits no visible ***,electrochemical test,finite-difference time-domain(fDTD),density functional theory(DfT)calculation and the free radical trapping experiments verify the possible mechanisms of photocatalytic degradation in this *** strat-egy paves a new way for low energy consumption removal and energy recovery of organic pollutants.

关键词： Photo-mfC CdS cage Tetracycline degradation mineralization Electricity production

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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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Hard yet tough and self-lubricating(CuNiTiNbCr)C_(x) high-entropy nanocomposite films:Effects of carbon content on structure and properties

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journal of materials Science & Technology 2024年第6期173卷 20-30页

作者： Y.T.Li x.m.Chen x.K.Zeng m.Liu x.jiang Y.x.Leng Key Laboratory of Advanced Technologies of materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Key Laboratory of Noise and Vibration Research Institute of AcousticsChinese Academy of SciencesBeijing 100190China State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190China School of mechanical and Electrical Engineering Mianyang Teachers’CollegeMianyang 621000China

The single-phase high-entropy alloy film is difficult to meet severe friction conditions due to its low hardness and high friction ***-composite structure film is composed of at least two separated phases,showing the properties of strength and toughness integration and excellent wear *** design of nanocomposite structures can effectively improve the mechanical properties and tribological properties of high-entropy alloy *** this study,the(CuNiTiNbCr)C_(x) nanocomposite high-entropy films(HEfs)integrated with high hardness,high toughness,and self-lubrication were synthesized by the double-target co-sputtering *** effect of carbon content on microstructure,mechanical properties,and tribological properties of(CuNiTiNbCr)C_(x) films was *** the increase of carbon content in the HEfs,the carbon atoms preferentially react with Ti,Nb,and Cr to form a(TiNbCr)C ceramic-reinforced phase,and then the excess carbon atoms precipitate in the form of amorphous carbon(a-C)lubricating phase in the *** structure of the HEfs changes from an amorphous structure to a nanocomposite structure of amorphous(amorphous CuNiTiNbCr phase+a-C phase)/nanocrystalline(TiN-bCr)C *** the carbon content is about 21.2 at.%,the carbide phase in the film reaches saturation and the hardness and modulus of the films are highest,which are 18 GPa and 228 GPa,*** HEfs with a carbon content of 44.0 at.%show the best toughness and tribological properties with a friction coefficient of 0.16 and a wear rate of 2.4×10^(-6) mm^(3)/(N m),which is mainly attributed to the excellent resistance to fatigue crack growth and the interfacial lubricating layer formed in the friction *** nanocomposite(CuNiTiNbCr)C_(x) HEfs show very promising application prospect in the field of friction protection.

关键词： High-entropy films Nanocomposite Double-target co-sputtering Strengthening-toughening Tribological properties

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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 microstructure characteristics and fracture behavior of the polyhedral primary iron-rich phase and plate-shaped eutectic iron-rich phase in a high-pressure die-cast AlSi10mnmg alloy

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journal of materials Science & Technology 2023年第9期140卷 201-209页

作者： x.Y.jiao Y.x.Liu j.Wang W.N.Liu A.x.Wan Stuart Wiesner S.m.xiong School of materials Science and Engineering Northeastern UniversityShenyang 110819China School of materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory of Lightweight Structural materials Liaoning ProvinceNortheastern UniversityShenyang 110819China Key Laboratory for Advanced materials Processing Technology Tsinghua UniversityBeijing 100084China Shanghai Synchrotron Radiation facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Ein Unternehmen der ALUmINIUm RHEINfELDEN Group RHEINFELDEN 79618Germany

The characterization of multiple iron-rich phases in high-pressure die-cast AlSi10mnmg alloy was *** was focused on the formation and fracture behavior of the primary iron-rich phase((P-ImC)_(I))formed in the shot sleeve and plate-shaped eutectic iron-rich phase in high-pressure die cast(HPDC)AlSi10mnmg *** show that multiple types of iron-rich phases with various morphologies,in-cluding primary iron-rich phases(polyhedral(P-ImC)_(I) and(P-ImC)_(II))and eutectic iron-rich phases(plate-shaped,net shape,and fish-bone shape),were found in HPDC ***(P-ImC)_(I) formed in the shot sleeve were distributed in the interface between primaryα-Al and binary Al-Si *** size(P-ImC)_(II) and various eutectic iron-rich phases formed in the die cavity and they were distributed in Al-Si binary *** primary iron-rich phases belonged to a simple cubic crystal structure with a lattice constant a=1.265 nm and they exhibited a lateral growth characteristic with a termination of{110}surface.βphase was surrounded byδphase and they coexisted in a plate-shaped iron-rich ***-density stacking fault inβphase andδ/βinterface provided an excellent nucleation site forδ*** mechanical behavior,the stress concentration caused by eutectic iron-rich phases was far less than(P-ImC)_(I) and it would not cause crack initiation along the eutectic cluster *** addition,(P-ImC)_(I) showed the worst deformation coordination with primaryα-Al while the plate-shaped eutectic iron-rich phase exhibited similar deformation characteristics with silicon particles.

关键词： AlSi10mnmg High-pressure die casting multiple iron-rich phases

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Updating the distribution of Nothofagus alessandrii: Impact of deforestation, fragmentation and connectivity

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fOREST ECOSYSTEmS 2025年第01期12卷 136-145页

作者： Cabrera-Ariza, Antonio m. Rivas, Carlos A. Aguilera-Peralta, miguel Navarro-Cerrillo, Rafael m. Santelices-moya, Romulo Univ Catolica maule Ctr Invest Estudios Avanzados Maule Ave San Miguel 3605 Talca 3460000 Chile Univ Catol maule Fac Ciencias Agr & Forestales Ctr Desarrollo Secano Interior Talca 3460000 Chile Univ Cordoba Lab Dendrochronol Silviculture & Global Change DendrodatLab ERSAF Dept Forest Engn Cordoba Spain

Nothofagus alessandrii forests in the mediterranean region of Chile face significant threats from deforestation, fragmentation, wildfires, and climate change. This study investigated the temporal and spatial dynamics of N. alessandrii populations and their implications for habitat fragmentation and connectivity. Using remote sensing data and geographic information system analysis, we assessed deforestation patterns, fragmentation metrics, and connectivity indices for different scenarios between 2009 and 2022. A reduction in the N. alessandrii forest area, extensive fragmentation, and decreased connectivity were observed over time, with wildfires exacerbating these trends. Reforestation simulations showed the potential of targeted restoration efforts to improve connectivity, especially when focusing on proximate patches. However, careful consideration of seed dispersal distances and wildfire risk is essential for effective reforestation planning. Overall, our findings underscore the urgent need for conservation interventions to preserve N. alessandrii forests and their biodiversity in Chile's coastal mountain ecosystems. A proactive and collaborative approach is essential to ensure the survival of these forests for future generations.

关键词： Ruil Endangered species Red list IUCN Conservation biology

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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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