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Interfacial Microstructures and Mechanical Properties of TiC Reinforced GH 3230 Superalloy Manufactured by Laser Metal Deposition

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Chinese Journal of Mechanical Engineering 2024年第6期37卷 43-58页

作者： Yan Wang Neng Li Wei Liu Chonglin Jia Yu Wu Chao Gao Huaping Xiong Division of Welding and Plastic Forming 3D Printing Research and Engineering Technology CenterBeijing Institute of Aeronautical MaterialsBeijing 100095China Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical MaterialsBeijing 100095China

GH 3230 superalloy is a solution strengthening nickel-based superalloy and it is commonly used for fabricating hot components with the service temperature of above 900℃.In order to further improve high-temperature performance,nickel-based alloy matrix composites(NMCs)were ***,it is known that laser additive manufacturing is an optional method for fabricating nickel-based ***,the research on ceramic-reinforced GH 3230 fabricated by laser metal deposition(LMD)are highly *** aim of this study is to develop TiC ceramic particle reinforced GH 3230 composites using laser metal deposition(LMD)method and study the effect of TiC content on their microstructure and tensile *** results showed that TiC particles not only changed the intensity and position of the X-ray diffraction peaks of the alloy matrix but also had a significant effect on the refinement of the cellular ***,it was found that an interfacial layer with sub-micrometer thickness was formed between the TiC ceramic particle and the superalloy matrix,which was identified to be(W,Ti)C_(1-x)phase by the *** terms of the as-built composites,the ultimate tensile strength(UTS)and yield strength(YS)gradually increased,but elongation(EL)decreased with the increase of TiC *** the as-LMDed 10 vol.%TiC/GH3230 composites,UTS and EL reached 1077.0 MPa and 12.4%,*** enhancement of the tensile strength for composites was attributed to the combined effect of grain refinement strengthening,Orowan strengthening,dislocation strengthening and loading-bearing strengthening.

关键词： Laser metal deposition GH 3230 superalloy TiC particles Mechanical properties Interfacial layer

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SIMULTANEOUS MICROFLUIDIC SYNTHESIS AND SILANIZATION OF IRON OXIDE NANOPARTICLES

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UPB Scientific Bulletin, Series B: Chemistry and Materials science 2025年第1期87卷 21-34页

作者： Niculescu, Adelina-Gabriela Bîrcă, Alexandra Cătălina Moroșan, Alina Oprea, Ovidiu Cristian Vasile, Bogdan Ștefan Purcăreanu, Bogdan Mihaiescu, Dan Eduard Grumezescu, Alexandru Mihai Dept. of Science and Engineering of Oxide Materials and Nanomaterials National University of Science and Technology POLITEHNICA Bucharest Romania ACS ICUB—Research Institute of the University of Bucharest Romania Dept. of Organic Chemistry National University of Science and Technology POLITEHNICA Bucharest Romania Dept. of Inorganic Chemistry National University of Science and Technology POLITEHNICA Bucharest Romania National Research Center for Micro and Nanomaterials National University of Science and Technology POLITEHNICA Bucharest Romania Research Center for Advanced Materials Products and Processes National University of Science and Technology POLITEHNICA Bucharest Romania BIOTEHNOS SA Otopeni Romania CS I ICUB—Research Institute of the University of Bucharest Romania

Iron oxide nanoparticles (Fe3O4 NPs) have garnered significant attention in recent years due to their favorable physicochemical and biological characteristics, which make them highly versatile for various applications. As a result, there is an increasing focus on optimizing synthesis approaches to ensure they are both more efficient and reproducible. Thus, this study proposes utilizing emerging microfluidic technologies to fabricate uniform core (Fe3O4)-shell (3-aminopropyltriethoxysilane-APTES) NPs with tunable characteristics, accomplishing the material's simultaneous on-chip synthesis and silanization within a 3D microfluidic platform. The synthesized nanomaterials were analyzed using several techniques, including XRD, FT-IR, DLS, TEM, and TG-DSC techniques. © 2025, Politechnica University of Bucharest. All rights reserved.

关键词： Metal nanoparticles

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Microstructures and micromechanical behaviors of high -entropy alloys investigated by synchrotron X-ray and neutron diffraction techniques: A review

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1333-1349页

作者： Yubo Huang Ning Xu Huaile Lu Yang Ren Shilei Li Yandong Wang Beijing Advanced Innovation Center of Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China AnSteel Beijing Research Institute Co.Ltd. Beijing 102200China Spallation Neutron Source Science Center Dongguan 523803China Department of Physics City University of Hong KongHong Kong 999077China Institute for Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

High-entropy alloys(HEAs)possess outstanding features such as corrosion resistance,irradiation resistance,and good mechan-ical properties.A few HEAs have found applications in the fields of aerospace and *** studies on the deformation mech-anisms of HEAs can guide microstructure control and toughness design,which is vital for understanding and studying state-of-the-art structural *** X-ray and neutron diffraction are necessary techniques for materials science research,especially for in situ coupling of physical/chemical fields and for resolving macro/microcrystallographic information on ***,several re-searchers have applied synchrotron X-ray and neutron diffraction methods to study the deformation mechanisms,phase transformations,stress behaviors,and in situ processes of HEAs,such as variable-temperature,high-pressure,and hydrogenation *** this review,the principles and development of synchrotron X-ray and neutron diffraction are presented,and their applications in the deformation mechanisms of HEAs are *** factors that influence the deformation mechanisms of HEAs are also *** review fo-cuses on the microstructures and micromechanical behaviors during tension/compression or creep/fatigue deformation and the application of synchrotron X-ray and neutron diffraction methods to the characterization of dislocations,stacking faults,twins,phases,and intergrain/interphase stress *** on future developments of synchrotron X-ray and neutron diffraction and on research directions on the deformation mechanisms of novel metals are discussed.

关键词： high-entropy alloys microstructures micromechanical behaviors synchrotron X-ray diffraction neutron diffraction

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Enhancing the peroxidase-like activity of MoS_(2)-based nanozymes by introducing attapulgite for antibacterial application and sensitive detection of glutathione

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Nano research 2024年第8期17卷 7415-7426页

作者： Feng Feng Yihe Zhang Xiao Zhang Bin Mu Jiahe Zhang Wenjie Qu Wangshu Tong Minmin Liang Qi An Zhanjun Guo Lu Zhao Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid WastesNational Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of Geosciences(Beijing)Beijing 100083China Key Laboratory of Clay Mineral Applied Research of Gansu Province Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Experimental Center of Advanced Materials School of Materials Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

Nanozymes are next-generation of nanomaterials with enzyme-like *** particular,nanozymes with peroxidase(POD)-like activity have been utilized in various fields,including antibacterial,detection,degradation,***,their extensive applications were limited by their low catalytic activity ***,we have presented a composite nanozyme based on attapulgite(ATP)(Fe-ATP-MoS_(2)(FAM)),which exhibited enhanced POD-like activity(185.33 U·mg^(−1)),4.25 times higher than that of Fe-MoS_(2)(FM)(43.63 U·mg^(−1)).The density functional theory(DFT)calculations indicated that the addition of ATP increased the electron density of metal centers(Mo and Fe).More importantly,Michaelis–Menten kinetics revealed that the introduction of ATP significantly enhanced the binding affinities of substrates through the pores of ATP,forming a highly concentrated substrate microenvironment and thus promoting its POD-like ***,from molecular size and kinetic analysis,we proposed that the changes in substrate size before and after oxidation also significantly affected its Michaelis-constant(Km)***,we utilized FAM in the applications of highly effective antibacterial application and sensitive detection of glutathione(GSH).In conclusion,this work provides a novel approach for designing a highly efficient nanozyme based on natural mineral composites.

关键词： attapulgite peroxidase electron density affinity antibacterial

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Pd-catalyzed diastereoselective 1,1-diarylation of 1,1-disubstituted alkenes enabling the modular synthesis of 1,1,2,2-tetraarylethanes

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science China Chemistry 2023年第12期66卷 3539-3545页

作者： Chengxi Zhang Yang Xi Jingping Qu Yifeng Chen Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research CenterFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science&TechnologyShanghai 200237China

The highly diastereoselective dicarbofunctionalization of substituted olefins still remains a daunting challenge in synthetic ***,we report a Pd-catalyzed diastereoselective 1,1-diarylation of 1,1-diarylethylene with chelation group free to enable the modular synthesis of smart material candidates,1,1,2,2-tetraarylethanes(TAEs),which represent the first protocol by assembling four different aryl groups into ethane *** mechanistic experiments suggest that the crucial Pd–H species generated in situ do not disengage from the alkene intermediate during the reaction.

关键词： 1,1,2,2-tetraarylethane palladium cross-coupling reaction alkene multicomponent reactions

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Improvement of impact properties of Al-Si-Mg alloy via solution treatment and joint modification with Sr and La

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Rare Metals 2024年第7期43卷 3301-3313页

作者： Xiong-Ling Zheng Shao-Xiang Li Jia-Le Ma Qing-Yan Xu Hai-Dong Zhao Zhi-Qiang Han Key Laboratory for Advanced Materials Processing Technology Ministry of EducationSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China National Engineering Research Center of Near-Net Shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510641China

An effort to obtain superior impact properties for Al-7Si-0.35 Mg alloy is presented,where modification with 0.02 wt% Sr and 0.1 wt% La as well as solution treatment was jointly *** samples were solution treated at 535℃ for 15 min to 12 *** microstructure,fracture mechanism,and their correlation with the impact properties of the alloy were studied in detail mainly through optical microscopy(OM),scanning electron microscopy(SEM) and oscillography impact *** results show that the addition of Sr and La refined the eutectic Si particles significantly from~ 2.05 μm(modified with Sr alone) to~ 0.75 μm in as-cast microstructure,leading to a very homogeneous distribution of spheroidized Si particles in the alloy solution treated at 535℃ for 8 *** alloy exhibits excellent impact toughness up to 75 J·cm^(-2),which is much higher than the maximum impact toughness of the alloys modified by Sr alone(~ 46 J·cm^(-2)).The major reason for this remarkable increase in the impact property is the dramatic increase in crack initiation *** dispersoid-free zones(DFZs)near the eutectic regions mainly consist of the ductile Al-matrix,which exhibits excellent *** ductile Al-matrix of the DFZs hinders the crack propagation,resulting in a significant increase in crack propagation energy.

关键词： Aluminum alloys Modification Solution treatment Microstructure Impact properties Fracture mechanism

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Oxygen vacancy engineering for tuning the catalytic activity of LaCoO_(3) perovskite

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Journal of Rare Earths 2024年第3期42卷 506-514,I0003页

作者： Jeong Hyun Cho Minjae Kim Inchan Yang Kyung Tae Park Chang Houn Rhee Hai Woong Park Ji Chul Jung Department of Chemical Engineering Myongji UniversityYongin 17058Republic of Korea Institute of Advanced Composite Materials Korea Institute of Science and TechnologyWanju-gunJeollabuk-do 55324Republic of Korea Iron&Steel Process Engineering Research Group POSCOPohang 37859Republic of Korea Hydrogen Research Center Research Institute of Industrial Science&Technology(RIST)Pohang 37673Republic of Korea

Herein, we attempted to engineer oxygen vacancies on the surface of LaCoO_(3) perovskite through simple post-treatments(acid or reductive thermal treatments). Acid treatment induces oxygen vacancies through the selective etching of the La cations, whereas thermal treatment in a reducing atmosphere generates oxygen vacancies by directly removing lattice oxygen. The characterization results confirm that the number of surface oxygen vacancies, which are crucial in various catalytic oxidation reactions,considerably increases in the LaCoO_(3) catalysts treated with acid or reducing gas. Acid treatment enriches the oxygen vacancies while maintaining the structure of the LaCoO_(3) catalysts, which can not be achieved through reductive thermal treatment. Therefore, the acid treatment is considered a promising technique for oxygen vacancy engineering of perovskite catalysts for tuning their catalytic activities. Furthermore,the catalytic activities of the posttreated LaCoO_(3) catalysts for CO oxidation were evaluated and are noted to be considerably better than those of the pristine LaCoO_(3) catalyst due to their abundant oxygen vacancies. Consequently, we conclude that the oxygen vacancies of perovskite catalysts can be effectively engineered via two simple methods and play a significant role in CO oxidation.

关键词： LaCoO_(3)perovskite Acid treatment Reductive thermal treatment Oxygen vacancy CO oxidation Rare earths

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Alloy synthesis and processing by semi-supervised text mining

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npj Computational Materials 2023年第1期9卷 459-470页

作者： Weiren Wang Xue Jiang Shaohan Tian Pei Liu Turab Lookman Yanjing Su Jianxin Xie Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology Beijing100083 BeijingChina Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing100083 BeijingChina Liaoning Academy of Materials Shenyang 110000 LiaoningChina Beijing Key Laboratory of Advanced High Temperature Materials Central Iron&Steel Research Institute100081 BeijingChina Beijing GAONA Materials&Technology Co. LTD100081 BeijingChina AiMaterials Research LLC Santa FeNM 87501USA

Alloy synthesis and processing determine the design of alloys with desired microstructure and ***,using data science to identify optimal synthesis-design routes from a specified set of starting materials has been limited by large-scale data *** mining has made it possible to convert scientific text into structured data ***,the complexity,diversity,and flexibility of synthesis and processing expressions,and the lack of annotated corpora with a gold standard severely hinder accurate and efficient *** we introduce a semi-supervised text mining method to extract the parameters corresponding to the sequence of actions of synthesis and *** automatically extract a total of 9853 superalloy synthesis and processing actions with chemical compositions from a corpus of 16,604 superalloy articles published up to *** have then been used to capture an explicitly expressed synthesis factor for predictingγ′phase *** synthesis factor derived from text mining significantly improves the performance of the data-drivenγ′size prediction *** method thus complements the use of data-driven approaches in the search for relationships between synthesis and structures.

关键词： superalloy microstructure synthesis

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Multi-state photoluminescent properties of an overcrowded alkene-based molecular motor in aggregates

Aggregate

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Aggregate 2024年第5期5卷 1-8页

作者： Yahan Shan Jinyu Sheng Qi Zhang Marc C.A.Stuart Da-Hui Qu Ben L.Feringa Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghaiChina Stratingh Institute for Chemistry and Zernike Institute for Advanced Materials University of GroningenGroningenNetherlands Institute of Science and Technology Austria KlosterneuburgAustria

Photoisomerization and photoluminescence are two distinct energy dissipation path-ways in light-driven molecular *** photoisomerization properties of discrete molecular motors have been well established in solution,but their photoluminescent properties have been rarely reported-especially in ***,it is shown that an overcrowded alkene-based molecular motor exhibits distinct dynamic prop-erties in solution and aggregate states,for example,gel and solid *** the poor emissive properties of molecular motors in solution,a bright emission is observed in the aggregate states,including in gel and the crystalline *** emis-sion wavelength is highly dependent on the nature of the supramolecular packing and order in the *** a result,the fluorescent color can be readily tuned reversibly via mechanical grinding and vapor fuming,which provides a new platform for developing multi-stimuli functional materials.

关键词： aggregation-induced emission gelation-induced emission mechanochromicﬂuorescence molecular motor photoluminescence

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Thermal shock resistant 3D printed ceramics reinforced with MgAl_(2)O_(4) shell structure

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Journal of Materials science & technology 2024年第11期178卷 100-111页

作者： Yuxiang Qiu Qiaolei Li Kun Yang Funan Jin Jun Fan Jingjing Liang Yizhou Zhou Xiaofeng Sun Jinguo Li Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Space Manufacturing Technology(CAS Key Lab) Beijing 100094China

The demand for the swirl nozzle with enhanced temperature resistance and lightweight properties is in-creasing as the thrust-to-weight ratio of aero-engines *** Al_(2)O_(3) ceramic swirl nozzle can maintain high strength in a hostile environment of high temperature and severe corrosion,while also meeting the requirements of aircraft to enhance efficiency and decrease ***,Al_(2)O_(3) ceramics are limited in their application for aerospace components due to their poor thermal shock resistance(TSR)stemming from their inherent *** work reported an innovative design and fabrication strategy based on photopolymerization 3D printing technology to realize the three-dimensional shell structure through element interdiffusion and nanoscale stacking of the reinforced *** this strategy,a novel type of the new dual-structure Al_(2)O_(3) ceramic composed of MgAl_(2)O_(4) shell structure and matrix could be con-structed in *** nano-sized MgAl_(2)O_(4) caused a crack passivation effect after the thermal shock,which could improve the strength and TSR of 3D-printed Al_(2)O_(3) *** addition,the effects of MgO content and sintering temperature on sintering behavior,flexural strength,porosity,and TSR of Al_(2)O_(3) ceram-ics manufactured by digital light processing(DLP)processing were systematically *** optimum overall performance of Al_(2)O_(3) ceramics was obtained at the sintering temperature of 1550℃and the MgO content of 1.0 wt.%,with a maximum flexural strength of 111.929 MPa and a critical temperature difference of 374.24℃for *** on the above research,an aero-engine swirl nozzle with high ther-mal shock resistance has been successfully prepared by ceramic 3D printing technology,which enhances high-temperature resistance and promotes lightweight design in aero-engine.

关键词： 3D printing Thermal shock resistance Swirl nozzle Flexural strength Ceramic material

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