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EBSD analysis of grain boundary evolution and dynamic recrystallization of Inconel 625 superalloy at various hot spinning feed rates

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Progress in Natural Science:materials International 2024年第1期34卷 56-65页

作者： Zhanjie Jing Jiangkun Fan Xudong Liu Yuelin Song Zixiao Wang Kai Cao Yuetan Chen Heng Fu Jianing Zhang Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Chongqing Innovation Center Northwestern Polytechnical University National&Local Joint Engineering Research Center for Precision Thermoforming Technology of Advanced Metal Materials

Hot spinning can make the material withstand shear stress, so that the shape of the material has a great change,which is one of the main processing methods of nickel-based alloy plate members. Inconel 625 alloy, which has excellent high temperature mechanical properties and can be used as the main candidate material for aerospace applications, needs further study on its hot spinning deformation behavior and deformation mechanism. In this paper, the effect of feed rate on the microstructure evolution of Inconel 625 superalloy was studied by the electron backscattered diffraction technology. The microstructure with necklace-like structures composed of dynamic recrystallization(DRX) grains was observed after hot spinning. It was found that at the low feed rate, the promotion of DRX degree and grain refinement happened, where the grain size reached the trough of 10.99 μm under a feed rate of 300 mm/min. However, with the further feed rate rising, the degree of DRX was suppressed to a certain extent and grain size increased to 14.26 μm. On balance, the feed rate of 300 mm/min was the most efficient condition for grain refinement. Besides, it was revealed that both discontinuous dynamic recrystallization(DDRX) and continuous dynamic recrystallization(CDRX) occurred during hot spinning. DDRX includes the initial grain boundary nucleation by bulging and the annealing twin boundary assisted nucleation, while the CDRX mechanism is related to the continuous subgrain rotation within the deformed grain. DDRX is the main DRX mechanism.

关键词： Inconel 625 superalloy Hot spinning Grain boundary evolution DRX mechanism

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Microemulsion synthesis of Mesoporous β-tricalcium Phosphate Powder with a Novel System

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Journal of Wuhan University of technology(materials Science) 2022年第4期37卷 773-778页

作者： BIELEC Monikaq HUANG An XIA Yuhao DAI Honglian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyShenzhen 5180ooChina Shenzhen Institute of Wuhan University of Technology Wuhan 430070China

The synthesis of mesoporous β-tricalcium phosphate(β-TCP)powder was performed by using the microemulsion approach,with hexadecyltrimethyl ammonium bromide(CTAB)/cyclohexane/n-octyl alcohol microemulsion *** influences of different pH values and calcination temperatures on the phase composition of the β-TCP powder were *** in vitro proliferation of bone marrow mesenchymal stem cells(BMSCs)in the suspensions of β-TCP powders with meso-structure was *** phase composition,mesoporous structure,powder morphology,cell morphology and the optical density(OD)were characterized through X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM),Fourier transform infrared(FTIR)spectroscopy,Nadsorption-desorption isotherms,inverted phase contrast microscopy and Multiskan spectrum,*** mesoporous β-TCP powder with specific surface area of 12.85 m^(2)/g and the average pore size 7.11 nm was obtained through the microemulsion approach(100 g/L CTAB/250 mL/L cyclohexane/250 mL/L n-octyl alcohol)with a controlled pH of 7.0,after calcinating the powder at 800℃.It was confirmed that mesoporous β-TCP powder benefits the activity of BMSCs more than the non-mesoporous β-TCP powder.

关键词： β-tricalcium phosphate mesoporous microemulsion bone marrow mesenchymal stem cells

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Atomically dispersed Ni electrocatalyst for superior urea-assisted water splitting

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Journal of Energy Chemistry 2024年第3期90卷 1-6,I0002页

作者： Fang Luo Shuyuan Pan Yuhua Xie Chen Li Yingjie Yu Zehui Yang College of Materials Science and Engineering State Key Laboratory of New Textile Materials&Advanced Processing TechnologyWuhan Textile UniversityWuhan 430200China Hubei Hydrogen Energy Technology Innovation Center Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074HubeiChina

Urea oxidation reaction(UOR) has been selected as substitution for oxygen evolution reaction ascribing to its low thermodynamic voltage as well as utilization of nickel as ***,we report the formation of nickel single atoms(Ni-SAs) as exceptional bifunctional electrocatalyst toward UOR and hydrogen evolution reaction(HER) in urea-assisted water *** UOR catalysis,Ni-SAs perform a superior catalytic performance than Ni-NP/NC and Pt/C ascribing to the formation of HOO-Ni-N_(4) structure evidenced by in-situ Raman spectroscopy,corresponding to a boosted mass activity by 175-fold at 1.4 V *** than Ni-NP/***,Ni-SAs requires only 450 mV overpotential to obtain HER current density of 500 mA cm^(-2).136 mA cm^(-2) is achieved in urea-assisted water splitting at1.7 V for Ni-SAs,boosted by 5.7 times than Pt/C-IrO_(2) driven water splitting.

关键词： Urea oxidation reaction Hydrogen evolution reaction Nickel single atoms Water splitting

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Recent advances in electrochemical synthesis of urea via C-N coupling

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Journal of Energy Chemistry 2024年第11期98卷 294-310页

作者： Chen Wang Wenqi Gao Wei Hu Wei Wen Shengfu Wang Xiuhua Zhang Dafeng Yan Bao Yu Xia Hubei Key Laboratory for Precision Synthesis of Small Molecule Pharmaceuticals&Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules&College of Chemistry and Chemical Engineering Hubei UniversityWuhan 430062HubeiChina School of Chemistry and Chemical Engineering State Key Laboratory of Materials Processing and Die&Mould TechnologyKey Laboratory of Material Chemistry for Energy Conversion and Storage(Ministry of Education)Hubei Key Laboratory of Material Chemistry and Service FailureWuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology(HUST)Wuhan 430074HubeiChina

Urea is widely used as fertilizer and is a key substance supporting global food production. However, the traditional industrial synthesis of urea faces the challenges with high energy consumption and serious environmental problems. With the increasing global demand for environmental protection and sustainable development, it is much necessary to develop novel and clean methods for the synthesis of *** provides an efficient and renewable synthesis route that can directly produce urea at room temperature and atmospheric pressure by the coupling of CO_(2) and nitrogenous molecules. In this review, we summarized the most recent advances in electrochemical synthesis of urea via CAN coupling systematically, focusing on the coupling of CO_(2) and different nitrogen sources. And the associated coupling mechanism, catalysts optimization, and electrolyzer design are well discussed. Moreover, the challenges and future directions for electrocatalytic CAN coupling are prospected. This review will provide timely and valuable guidance for others and attract more interests to promote the development of electrochemical synthesis of urea or other valuable chemicals containing CAN bond.

关键词： Electrocatalysis CAN coupling Urea synthesis CO_(2)and N_(2)fixation

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Elastic properties of Cu–6wt% Ag alloy wires for pulsed magnets investigated by ultrasonic techniques

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Chinese Physics B 2025年第2期34卷 90-95页

作者： Ziyu Li Tianyi Gu Wenqi Wei Yang Yuan Zhuo Wang Kangjian Luo Yupeng Pan Jianfeng Xie Shaozhe Zhang Tao Peng Lin Liu Qi Chen Xiaotao Han Yongkang Luo Liang Li Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China School of Physics Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China School of Materials Science and Engineering State Key Laboratory for Materials Processing and Die&Mold TechnologyHuazhong University of Science and TechnologyWuhan 430074China

Conductor materials with good mechanical performance as well as high electrical and thermal conductivities are particularly important to break through the current bottle-neck limit(~ 100 T) of pulsed magnets. Here, we perform systematic studies on the elastic properties of the Cu–6wt% Ag alloy wire, which is a promising candidate material for the new-generation pulsed magnets, by employing two independent ultrasonic techniques, i.e., resonant ultrasound spectroscopy(RUS) and ultrasound pulse-echo experiments. Our RUS measurements manifest that the elastic properties of the Cu–6wt% Ag alloy wires can be improved by an electroplastic drawing procedure as compared with the conventional cold drawing. We also take this opportunity to test the availability of our newly-built ultrasound pulse-echo facility at the Wuhan National High Magnetic Field Center(WHMFC, China), and the results suggest that the elastic performance of the electroplastically-drawn Cu–6wt% Ag alloy wire remains excellent without anomalous softening under extreme conditions,e.g., in ultra-high magnetic field up to 50 T and nitrogen or helium cryogenic liquids.

关键词： high-field magnet Cu–Ag alloy ultrasonic techniques elastic constants

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Activating Inert Sites in Cobalt Silicate Hydroxides for Oxygen Evolution through Atomically Doping

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Energy & Environmental materials 2022年第2期5卷 655-661页

作者： Jiexin Zhu Lixue Xia Wenxuan Yang Ruohan Yu Wei Zhang Wen Luo Yuhang Dai Wei Wei Liang Zhou Yan Zhao Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200China

Metal silicate hydroxides have been recognized as efficient oxygen evolution reaction(OER)electrocatalysts,yet tailoring of their intrinsic activity remains ***,Fe had been incorporated into cobalt silicate hydroxide nanosheets and the resulted material achieves a competitive OER catalytic *** is found that the doping state obviously affects the electrical transport ***,highly dispersed Fe atoms(low-concentration Fe doping)trigger slight electron transfer to Co atoms while serried Fe(highconcentration Fe doping)attract vast *** introducing 6 at.%Fe doping,partial relatively inert Co sites are activated by atomically dispersed Fe,bearing an optimal metal 3d electronic occupation and adsorption capacity to oxygen *** introduced Co-O-Fe unit trigger the p-donation effect and decrease the number of electrons in p*-antibonding orbitals,which enhance the Fe-O covalency and the structural *** a result,the sample delivers a low overpotential of 293 mV to achieve a current density of 10 mA cm^(-2).This work clarifies the superiority of atomically dispersed doping state,which is of fundamental interest to the design of doped catalyst.

关键词： atomically doping electrochemistry electron transfer metal silicate hydroxides oxygen evolution

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Fabrication and characterization of GCF/PyC composites by TG-CVI densified porous glassy carbon preform

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Ceramics International 2025年第15期51卷 20776-20785页

作者： Jia, Jiangang You, Xinya Pan, Zikang Zhang, Hongqiang Xiao, Yang Yuan, Zhongtian Liu, Diqiang Guo, Tieming State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou730050 China School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China

Carbon foams with adjustable three-dimensional architecture are obtained by template method. This paper describes the effects of template content impact on the porous framework, microstructure and mechanical properties of glassy carbon foams. Then a serious of glassy carbon foam/pyrocarbon (GCF/PyC) composites were fabricated by thermal gradient chemical vapor deposition (TG-CVI) using glassy carbon foam with different porosity as preform. After densification, bulk density of glassy carbon foam was increased and defects in carbon foam framework were repaired, which contributes to mechanical properties and ensures higher thermal conductivity. As the porosity increases, compressive strength of carbon foam gradually decreases from 83.03 MPa to 24.52 MPa. The compressive and flexural strengths of obtained GCF/PyC composites first increased and reached the peak values, then decreased. The maximum compressive and flexural strengths of GCF1/1-C are measured to be 120.5 MPa and 92.21 MPa, which are 135 % and 267 % higher than that of carbon foam GCF1/1. The thermal conductivity of carbon foam decreases from 1.22 W/m·K to 0.75 W/m·K with the porosity increase. For GCF/PyC composites, thermal conductivity first increases to 4.41 W/m·K then decrease, and GCF2/1-C has lowest thermal conductivity of 3.26 W/m·K among all GCF/PyC samples, which is 160 % higher than that of GCF2/1 before densification. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Glassy carbon

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Visible-light-induced controllable transformations of cumulative aryldienes through an energy transfer process

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Science China Chemistry 2025年第3期68卷 987-1001页

作者： Ling Qian Ziqi Yu Jiaxin Liu Yin Wei Min Shi Key Laboratory for Advanced Materials and Institute of Fine Chemicals Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research CenterSchool of Chemistry&Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Organometallic Chemistry Center for Excellence in Molecular SynthesisUniversity of Chinese Academy of SciencesShanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China Key Laboratory of Fluorine and Nitrogen Chemistry and Advanced Materials Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200032China

In this work,we report a visible light-induced energy transfer process related photochemical protocol of cumulative diene containing compounds for the construction of benzocyclohexene skeletons or the corresponding aromatized structures through an energy transfer process,1,5-hydrogen atom transfer and a 6πelectrocyclization or demethoxylation in the presence of different photocatalysts such as[Ir(dF(Me)ppy)_(2)(dtbbpy)]PF_(6) or *** newly developed photochemical strategy is characterized by mild conditions,broad substrate applicability,good functional group tolerance and good *** mechanistic paradigm was clarified by deuterium labeling,kinetic,photophysical and electrochemical analyses,control experiments and density functional theory(DFT)*** transformation of the obtained product to the drug-like molecules such as Sertraline and the luminescent conjugated aromatic compounds has also been disclosed.

关键词： visible-light photocatalysis EnT process 1,5-HAT remote C(sp^(3))-H bond activation

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Rational design and synthesis of Cr_(1-x)Te/Ag_(2)Te composites for solid-state thermoelectromagnetic cooling near room temperature

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Chinese Physics B 2024年第5期33卷 580-586页

作者：孙笑晨谢承昊陈思汗万京伟谭刚健唐新峰 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China International School of Materials Science & Engineering Wuhan University of TechnologyWuhan 430070China

materials with both large magnetocaloric response and high thermoelectric performance are of vital importance for all-solid-state thermoelectromagnetic *** two properties,however,hardly coexist in single phase materials except previously reported hexagonal Cr_(1-x)Te half metal where a relatively high magnetic entropy change(-△S_(M))of~2.4 J·kg^(-1)·K^(-1)@5 T and a moderate thermoelectric figure of merit(ZT)of~1.2×10^(-2)@300 K are simultaneously *** we aim to increase the thermoelectric performance of Cr_(1-x)Te by compositing with semiconducting Ag_(2)*** is discovered that the in-situ synthesis of Cr_(1-x)Te/Ag_(2)Te composites by reacting their constitute elements above melting temperatures is unsuccessful because of strong phase ***,at elevated temperatures(T>800 K),Cr_(1-x)Te has a much lower deformation energy than Ag_(2)Te and tends to become more Cr-deficient by capturing Te from Ag_(2)***,Ag is insufficiently reacted and as a metal it deteriorates *** then rationalize the synthesis of Cr_(1-x)Te/Ag_(2)Te composites by ex-situ mix of the pre-prepared Cr_(1-x)Te and Ag_(2)Te binary compounds followed by densification at a low sintering temperature of 573 K under a pressure of 3.5 *** show that by compositing with 7 mol%Ag_(2)Te,the Seebeck coefficient of Cr_(1-x)Te is largely increased while the lattice thermal conductivity is considerably reduced,leading to 72%improvement of *** comparison,-△S_(M)is only slightly reduced by 10%in the *** work demonstrates the potential of Cr_(1-x)Te/Ag_(2)Te composites for thermoelectromagnetic cooling.

关键词： thermoelectromagnetic cooling thermoelectric magnetocaloric composite chromium telluride

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Ablation resistance of ZrC coating modified by polymer-derived SiHfOC ceramic microspheres at ultrahigh temperature

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Journal of materials Science & technology 2024年第15期182卷 119-131页

作者： Xuemeng Zhang Yuyu Zhang Lingxiang Guo Bing Liu Yuqi Wang Hongbin Li Hejun Li Jia Sun Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’an 710072China China Aerodynamics Research and Development Center Mianyang 621000China Science and Technology on Advanced Ceramic Fibers and Composites Laboratory National University of Defense TechnologyChangsha 410073China

Polymer-derived ceramics(PDCs)method opens up new possibilities for the preparation of novel multi-phase ceramic nanocomposites owing to the molecular design of the precursors at the nanoscale *** the current work,ZrC coatings incorporated with polymer-derived ceramic microspheres(CMS),SiH-fOC_CMS,were deposited to enhance the ablation resistance by supersonic atmosphere plasma *** 10.0 MW·m^(-2) plasma ablation at above 3000℃,the linear ablation rate of ZrC-SiHfOC_CMS coat-ing was reduced to 0.20μm·s^(-1),62%lower than that of the pristine ZrC *** improvement was ascribed to the presentence of viscous SiO_(2)/HfO_(2) molten mixed phase,rather than HfSiO4,which can ef-fectively seal pinholes and ***,the in-situ generated crystalline SiO_(2) had a lower oxygen diffusion rate than amorphous SiO_(2),meanwhile,m-HfO_(2) could improve the stability of SiO_(2) glassy film,thus further enhancing the ablation resistance.

关键词： ZrC Polymer-derived ceramics(PDCs) Carbon/Carbon composites Plasma spraying Plasma ablation

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