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Correlation between platinum-aluminide coating features and tensile behavior of nickel-based superalloy Rene■80

Rare Metals 2024年第12期43卷 5391-5402页

作者： Mohammad Mehdi Barjesteh Seyed Mehdi Abbasi Karim Zangeneh Madar Kourosh Shirvani Metallic Materials Research Center Malek Ashtar University of Technology(MUT)Tehran 158751774Iran Department of Advanced Materials and New Energies Iranian Research Organization for Science and Technology(IROST)Tehran***Iran

The effect of platinum(a rare metal)-aluminide coating parameters on the tensile properties of nickel-based superalloy Rene■80 was evaluated at 871℃.For this purpose,initial layers of platinum with different thicknesses(2,4,6 and 8μm)were coated on tensile samples Then,low-temperature high-activity(LTHA)and hightemperature low-activity(HTLA)processes were used for *** of microstructural evaluations using scanning electron microscope(SEM)and phase analysis by X-ray diffraction(XRD)showed a three-layer structure coating for different platinum layer thicknesses and both aluminizing *** the thickness of the platinum layer from 2 to 8μm led to the improvement in the final coating thickness from 91.6 to 102.1μm in *** increase was from 128.1 to 148.6μm in *** results of hot tensile tests at 871℃ showed a decrease in strength properties of the coated samples compared to the uncoated ***,HTLA and high thicknesses of the initial platinum layer showed an intense *** results of fractographic evaluations abou uncoated samples showed a ductile *** the other hand,coated samples showed a simultaneous ductile and brittle fracture failure *** the main fracture morphology was brittle cleavage fracture which was for the HTLA.

关键词： Rene■80 Platinum-aluminide Aluminizing Tensile properties Fractography

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Bifunctionally Hydrophobic MOF-Supported Platinum Catalyst for the Removal of Ultralow Concentration Hydrogen Isotope

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Energy & Environmental Materials 2025年第2期8卷 144-154页

作者： Huiryung Heo Jeong-un Jang Euna Jeong Hyung-Ju Kim Young Jin Kim Chan Woo Park Jungseob So Dong-Yeun Koh Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology Decommissioning Technology Division Korea Atomic Energy Research Institute Department of Chemical Engineering and Applied Chemistry Chungnam National University Department of Environmental Engineering Kyungpook National University CO2 & Energy Research Center Korea Research Institute of Chemical Technology (KRICT) Saudi Aramco-KAIST CO2 Management Center

Water often presents significant challenges in catalysts by deactivating active sites,poisoning the reaction,and even degrading composite *** challenges are amplified when the water participates as a reactant and is fed as a liquid phase,such as trickle bed-type reactors in a hydrogen-water isotope exchange（HIE） *** key balance in such multiphase reactions is the precise control of catalyst design to repel bulk liquid water while diffusing water ***,a platinum-incorporated metal-organic framework（MIL-101） based bifunctional hydrophobic catalyst functionalized with long alkyl chains(C12,dodecylamine) and further manufactured with poly（vinylidene fluoride）,Pt@MIL-101-12/PVDF,has been developed which can show dramatically improved catalytic activity under multi-phase reactions involving hydrogen gas and liquid ***@MIL-101-12/PVDF demonstrates enhanced macroscopic water-blocking properties,with a notable reduction of over 65% in water adsorption capacity and newly introduced liquid water *** exhibiting a negligible increase in mass transfer resistance,i.e.,bifunctional *** catalytic activity,evaluated via HIE reaction,and its durability underscore the impact of bifunctional *** situ DRIFTS analysis elucidates water adsorption/desorption dynamics within the catalyst composite,highlighting reinforced water diffusion at the microscopic level,affirming the catalyst's bifunctionality in different length *** demonstrated radiation resistance,Pt@MIL-101-12/PVDF emerges as a promising candidate for isotope exchange reactions.

关键词： bifunctional hydrophobic catalyst hydrogen-water isotope exchange hydrophobic modification metal–organic framework tritium removal

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How storytelling through the use of avatars could help Fukushima evacuees express themselves: digital archive for people in the diaspora

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Medicine, Conflict and Survival 2024年第1期40卷 28-43页

作者： Sasaki, Kanako Research Center at Advanced Science and Technology University of Tokyo Meguro Japan

The Memorytalk online platform allows users to upload animated human stories. They may also choose to display related photos/characters and construct scenarios. Memorytalk may thus constitute a useful collaborative format for survivors of the Great East Japan Earthquake, especially evacuees from the town of Namie, who are now relocated in different areas across Japan, particularly as they are hesitant to talk about where they are from. This study examined various narrated animations created by Namie high school students within the Memorytalk platform, specifically for the purpose of investigating their storytelling methods based on Erving Goffman’s role-distance theory. Memorytalk not only allows avatars that provide users with anonymity when expressing a wide range of memories, it also creates (1) opportunities for face-to-face workshops in the context of computer-mediated communication and (2) the therapeutic benefits of being humorous. In sum, the platform may provide users with a form of role distancing in which people in the diaspora can more freely express themselves and also store valuable local memories. © 2024 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Avatar Digital archive Erving Goffman Fukushima Storytelling Therapy

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Unveiling the homogenization microstructure evolution and its effect on cellular structure for Fe-rich Sm-Co-Fe-Cu-Zr magnets

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Journal of Materials science & technology 2024年第27期194卷 142-150页

作者： Qiangfeng Li Chao Wang Lei Wang Yifei Bi Yikun Fang Yue Zhang Minggang Zhu Wei Li Division of Functional Materials Central Iron and Steel Research InstituteBeijing 100081China Academy for Advanced Interdisciplinary Science and Technology Beijing Advanced Innovation Center for Materials Genome Engineering and Beijing Key Laboratory for Advanced Energy Materials and TechnologiesSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

The solution-treated Fe-rich 2:17-type Sm-Co-based magnets generally contain an inhomogeneous mi-crostructure,which hinders the development of the complete cellular structure required for high-performance ***,the microstructure evolution of Sm(Cobal Fe_(0.31)Cu_(0.07)Zr_(0.025))_(7.7)magnet during the solution treatment is systematically *** the normal Fe-medium magnets,it was in-terestingly found that the initial-stage solution-treated Sm(Cobal Fe_(0.31)Cu_(0.07)Zr_(0.025))_(7.7)magnet possesses a profuse lamellar-type *** the lamellar-type microstructure,there are three microre-gions exhibiting an obvious difference in composition and 2:17R ordering ***,various 1:3R phases precipitated within the lamellar-type *** the disappearance of lamellar-type mi-crostructure,the 1:7H phase increased substantially,and the distribution of defect-aggregated cell bound-aries became uniform,promoting the homogeneous precipitation of 1:5H cell boundary phases during *** current study reveals a typical microstructural evolution in Fe-rich 2:17-type Sm-Co-based magnets during solution treatment.

关键词： Sm_(2)Co_(17)magnet Supersaturated solid solution Phase transformation TEM

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Enhanced strength and ductility in a powder metallurgy Ti material by the oxygen scavenger of CaB_(6)

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Journal of Materials science & technology 2023年第6期137卷 132-142页

作者： Yu Pan Jinshan Zhang Jianzhuo Sun Yanjun Liu Ce Zhang Rui Li Fan Kuang Xinxin Wu Xin Lu Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Engineering TechnologyNational Engineering Research Center for Advanced Rolling TechnologyUniversity of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China

The challenge of producing a high-ductility titanium(Ti)material using inexpensive high-oxygen hydride-dehydride(HDH)Ti powder is hereby addressed by the incorporation of CaB_(6)*** oxygen-scavenging behavior,microstructure evolution,mechanical behavior and improvement mechanism were systematically investigated.A continuous TiO_(2)oxide layer with a thickness of approximately 9.3 nm is presented on the HDH Ti powder *** oxide layer will dissolve into Ti matrix during sintering,making the increase of c/a value and leading to the Ti-Ti bonds developing from plastic metal bonds to-ward brittle covalent *** CaB_(6)addition can scavenge O impurity and make a significant increase in tensile ductility forα-Ti matrix.A small addition of 0.2 wt.%CaB_(6)provides a superior tensile elongation of 22.2%for Ti material,almost three times as high as that of pure Ti(7.5%).The increase of defor-mation twining activity and grain refinement are responsible for the improved ***,the CaB_(6)oxygen-scavenger can react with the surface oxide layer to in-situ form rod-like TiB and granular CaTiO_(3)reinforcements,refining the coarse near equiaxed grain ofα-Ti matrix into fine equiaxed *** multiple mechanisms of grain-boundary strengthening,load-bearing strengthening of TiB and Orowan strengthening of CaTiO_(3)nanoparticles work together to increase the tensile strength of Ti/CaB_(6)*** work offers an effective method to fabricate high-performance Ti material using inex-pensive high-oxygen HDH Ti powder.

关键词： Titanium Powder metallurgy Sintering Oxygen Mechanical properties

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Ferroelectricity induced by non-symmetry of A-site cations in hexagonal antiferromagnetic In_(1-x)Yb_(x)FeO_(3)(x=0.1,0.2,0.3) perovskites

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Journal of Rare Earths 2023年第12期41卷 1990-1995,I0006页

作者： Yong Zhou Peng Liu Yang Chen Bin Yang Bing Li Fuyang Liu Xiaoyang Liu State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun30012China Center for High Pressure Science and Technology Advanced Research Changchun130012China Center for High Pressure Science and Technology Advanced Research Beijing100094China

A new series of multiferroic In_(1-x)Yb_(x)FeO_(3)(x=0.1,0.2,0.3) compounds were prepared using the traditional synthesis method for the first *** substituting In ions in InFeO3with Yb ions results in the weak ferroelectricity of the compound.A dielectric relaxation peak is found at ~500 K in the temperature dependence of the dielectric properties of the resulted *** dielectric constant of In_(0.8)Yb_(0.2)FeO_(3)displays an anomaly at -500 K,and the ferroelectric hysteresis loop reveals its weak ferroelectric behaviors below this *** to InFeO_(3),the compounds crystallize in space group P63/*** increase in the Yb content leads to an increment in a and a reduction in c *** temperature dependence of magnetization for In_(0.8)Yb_(0.2)FeO_(3)gives a Néel temperature of -150 *** hysteresis loops at 10 and 100 K indicate its weak ferromagnetic characteristics above room ***,In_(1-x)Yb_(x)FeO_(3)(x=0.1,0.2,0.3) compounds show both weak ferroelectricity and weak *** non-symmetry of Yb cations causes the ferroelectricity of the compounds.

关键词： Solid phase synthesis Perovskite structure Multiferroic properties Doping InFeO_(3) Rareearths

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A Composite Ansatz for Calculation of Dynamical Structure Factor

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Chinese Physics Letters 2024年第1期41卷 92-103页

作者：张玉佩莫崇杰张平康炜 HEDPS Center for Applied Physics and Technologyand School of PhysicsPeking UniversityBeijing 100871China Beijing Computational Science Research Center Beijing 100193China Institute of Applied Physics and Computational Mathematics Beijing 100088China HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China

We propose an ansatz without adjustable parameters for the calculation of a dynamical structure *** ansatz combines the quasi-particle Green’s function,especially the contribution from the renormalization factor,and the exchange-correlation kernel from time-dependent density functional theory together,verified for typical metals and semiconductors from a plasmon excitation regime to the Compton scattering *** has the capability to reconcile both small-angle and large-angle inelastic x-ray scattering(IXS)signals with muchimproved accuracy,which can be used as the theoretical base model,in inversely inferring electronic structures of condensed matter from IXS experimental signals *** may also be used to diagnose thermal parameters,such as temperature and density,of dense plasmas in x-ray Thomson scattering experiments.

关键词： excitation inverse verified

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Microstructure evolution in large billet during reduction pretreatment based on laboratory experiments

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Journal of Iron and Steel research International 2023年第6期30卷 1244-1257页

作者： Yang Liu Jian-hua Liu Yang He National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing 100083China

The reduction pretreatment process has been proposed to improve the center quality of large billet and reduce the rolling *** microstructure evolution during the reduction pretreatment was further *** austenite grains were refined after the reduction pretreatment experiment,especially those at the center of the *** effects of strain and strain rate on the average grain size were dependent on the deformation *** a strain rate of 0.01 s-1 and 1200°C,the newly formed strain-free austenite grains grew very fast as the strain continued to increase,which resulted in the coarsening of austenite *** calculation results of the microstructure evolution model showed that at the same deformation temperature,the evolution curves of average grain size with different strain rates had the intersection *** the increase in temperature,the position of intersection point moved to the downward direction of *** simulation results showed that when the reduction amount increased to 20%,the average grain size at the center was smaller than that near the *** could be inferred that when the reduction amount greatly exceeded 20%,the dynamic recrystallization at the center was mostly completed,and the austenite grain growth would become the main mechanism.

关键词： Large billet Reduction pretreatment Dynamic recrystallization Grain refinement Microstructure evolution model

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Ultrafast joule-heating synthesis of FeCoMnCuAl high-entropy-alloy nanoparticles as efficient OER electrocatalysts

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Progress in Natural science:Materials International 2024年第5期34卷 880-887页

作者： Xindong Zhu Wen Huang Yu Lou Zhongzheng Yao Huiqiang Ying Min Dong Lan Tan Jianrong Zeng Hua Ji He Zhu Si Lan Herbert Gleiter Institute of Nanoscience School of Materials Science and Engineering Nanjing University of Science and Technology Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai Institute of Applied Physics Chinese Academy of Sciences Scientific Research and Innovation Center Suzhou Nuclear Power Research Institute National Engineering Research Center for Nuclear Power Plant Safety & Reliability

High entropy alloys（HEAs）, known for their synergistic orbital interactions among multiple elements, have been recognized as promising electrocatalysts for enhancing the sluggish kinetics of oxygen evolution reaction（OER）. Despite their potential, the facile and rapid preparation of HEA nanoparticles（NPs） with high electrocatalytic activity remains challenging. Here, we report an ultrafast synthesis of noble-metal-free FeCoMnCuAl HEA NPs loaded on conductive carbon fiber networks using a Joule heating strategy. The prepared HEA NPs exhibited a face-centered cubic（FCC） structure with an average size of approximately 25 *** X-ray absorption fine structure（XAFS） and X-ray photoelectron spectroscopy（XPS） studies were performed to investigate the atomic and electronic structures of the HEA NPs, revealing the co-presence of Fe, Co, Mn, Cu and Al elements as well as their different valences across surface and internal regions. The HEA NPs showed remarkable OER performance, exhibiting an overpotential of 280 mV at 10 mA cm-2and a low Tafel slope of 76.13 mV dec-1in a 1.0 M KOH solution with high electrochemical stability, superior to commercial RuO2electrocatalysts. This work provides a new approach for synthesizing nanoscale noble-metal-free HEA electrocatalysts for clean energy conversion applications on a large-scale basis for practical commercialization.

关键词： X ray photoelectron spectroscopy

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Chelating ligand-bridged IO-Gd nanoparticles with enhanced contrast performance for dual-mode MRI

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Journal of Materials science & technology 2024年第17期184卷 54-63页

作者： Lili Hao Haoyang Ding Xiangchuan Xu Hongli Mao Zhongwei Gu Research Institute for Biomaterials Tech Institute for Advanced MaterialsBio-inspired Biomedical Materials&Devices CenterCollege of Materials Science and EngineeringJiangsu Collaborative Innovation Center for Advanced Inorganic Function CompositesSuqian Advanced Materials Industry Technology Innovation CenterNanjing Tech UniversityNanjing 211816China NJTech-BARTY Joint Research Center for Innovative Medical Technology Nanjing 210000China

Magnetic resonance imaging(MRI)is a non-invasive medical imaging technique that has been widely applied in the clinical diagnosis of diseases across various ***,there is a dearth of high-performance dual-mode contrast agents that provide precise diagnostic information for complex *** this study,iron oxide-gadolinium nanoparticles(IO-Gd NPs)bridged by hydrophilic ligand ethylenedi-amine tetramethylenephosphonic acid(EDTMP)are designed inspired by Solomon-Bloembergen-Morgan(SBM)theory,where T_(1)and T_(2)relaxivity increase with a reduction in Gd *** particular,the NPs with minimum Gd content exhibit excellent dual-mode contrast performance(r_(1)=94.42 mM^(−1)s^(−1),r_(2)=343.62 mM^(−1)s^(−1)).The underlying mechanism is that the bridged EDTMP coordinate limits Gd tum-bling and forces Gd^(3+)to expose itself to the surface of the *** provides more opportunities for water molecules to coordinate with Gd^(3+)and significantly enhances proton ***,the hy-drophilicity of the ligand enhances the water dispersion stability of the NPs and increases the exchange rate of water protons near the NPs,further enhancing the dual-mode contrast ***,the biocom-patibility and in vitro/vivo imaging performances of the IO@EDTMP-Gd NPs are systematically evaluated,and the results demonstrate their potential as dual-mode contrast *** study provides a new strategy for developing dual-mode MRI contrast agents that can further improve the accuracy of MRI in the diagnosis of complex diseases.

关键词： Magnetic resonance imaging Dual-mode contrast agent Chelating ligand Iron oxide Gadolinium

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