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Robust interface and excellent as-built mechanical properties of Ti–6Al–4V fabricated through laser-aided additive manufacturing with powder and wire

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International Journal of Minerals,Metallurgy and materials 2025年第1期32卷 154-168页

作者： Fei Weng Guijun Bi Youxiang Chew Shang Sui Chaolin Tan Zhenglin Du Jinlong Su Fern Lan Ng Key Laboratory for Liquid-Solid Structural Evolution and Processing of materials Ministry of EducationShandong Engineering&Technology Research Center for Superhard MaterialSchool of Materials Science and EngineeringShandong UniversityJinan 250061China Institute of Intelligent Manufacturing Guangdong Academy of SciencesGuangzhou 510095China Singapore Institute of Manufacturing Technology 5 Cleantech Loop636732Singapore

The feasibility of manufacturing Ti-6Al-4V samples through a combination of laser-aided additive manufacturing with powder(LAAM_(p))and wire(LAAM_(w))was explored.A process study was first conducted to successfully circumvent defects in Ti-6Al-4V deposits for LAAM_(p) and LAAM_(w),*** the optimized process parameters,robust interfaces were achieved between powder/wire deposits and the forged substrate,as well as between powder and wire *** characterization results revealed the epitaxial prior β grains in the deposited Ti-6Al-4V,wherein the powder deposit was dominated by a finerα′microstructure and the wire deposit was characterized by lamellar α *** mechanisms of microstructure formation and correlation with mechanical behavior were analyzed and *** mechanical properties of the interfacial samples can meet the requirements of the relevant Aerospace material Specifications(AMS 6932)even without post heat *** fracture occurred within the interfacial area,further suggesting the robust *** findings of this study highlighted the feasibility of combining LAAM_(p) and LAAM_(w) in the direct manufacturing of Ti-6Al-4V parts in accordance with the required dimensional resolution and deposition rate,together with sound strength and ductility balance in the as-built condition.

关键词： laser-aided additive manufacturing powder deposition wire deposition interfacial characteristic mechanical behavior

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Photoelectrochemical　Properties　of　a　Ferrocene　Derivative　and　Its　Langmuir－Blodgett　Film

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Journal of Rare Earths 1996年第3期14卷 167-172页

作者：夏文胜叶宪曾黄春辉甘良兵王科志骆初平 State Key Laboratory of Rare Earth material Chemistry and applications Peking University Beijing 100871 China

ＰｈｏｔｏｅｌｅｃｔｒｏｃｈｅｍｉｃａｌＰｒｏｐｅｒｔｉｅｓｏｆａＦｅｒｒｏｃｅｎｅＤｅｒｉｖａｔｉｖｅａｎｄＩｔｓＬａｎｇｍｕｉｒ－ＢｌｏｄｇｅｔｔＦｉｌｍＸｉａｗｅｎｓｈｅｎｇ（夏文胜）；ＹｅＸｉａｎｚｅｎｇ（叶... 详细信息

ＰｈｏｔｏｅｌｅｃｔｒｏｃｈｅｍｉｃａｌＰｒｏｐｅｒｔｉｅｓｏｆａＦｅｒｒｏｃｅｎｅＤｅｒｉｖａｔｉｖｅａｎｄＩｔｓＬａｎｇｍｕｉｒ－ＢｌｏｄｇｅｔｔＦｉｌｍＸｉａｗｅｎｓｈｅｎｇ（夏文胜）；ＹｅＸｉａｎｚｅｎｇ（叶宪曾）；ＨｕａｎｇＣｈｕｎｈｕｉ（...

关键词： Ferrocene derivative Langmuir-Blodgett film Photoelectrochemical properties

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Novel Quasi-solid-state Dye-sensitized Solar Cell Based on Monolayer Capped TiO_2 Nanoparticles Framework materials

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Chinese Journal of Chemistry 2004年第7期22卷 687-690页

作者：夏江滨李富友黄春辉 State Key Laboratory of Rare Earth material Chemistry and applications Peking University Beijing 100871 China Institute of Advanced material Fudan University Shanghai 200433 China State Key Laboratory of Rare Earth material Chemistry and applications Peking University Beijing 100871 ChinaInstitute of Advanced Material Fudan University Shanghai 200433 China

Dodecylbenzenesulfonate (DBS)-capped TiO2 nanoparticles have been synthesized and employed in dye-sensitized solar cells to form a quasi-solid state electrolyte. Owing to the long alkyl-chain capping around the TiO2 nanoparticles interacting with the liquid solvent, the dye sensitized solar cell based on such DBS-capped TiO2 nanoparticle framework material gel electrolyte shows higher stability compared with the non-capped one in the long-term application and gives a comparable overall efficiency of 6.3% at AM 1.5 illumination.

关键词： dodenylbenzenesufonate capped TiO2 dye-sensitized solar cells quasi-solid state

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On the energy conservation and critical velocities for the propagation of a "steady-shock" wave in a bar made of cellular material

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Acta Mechanica Sinica 2013年第3期29卷 420-428页

作者： Li-Li Wang Li-Ming Yang Yuan-Yuan Ding Mechanics and material Science Research center Ningbo University

The propagation of shock waves in a cellular bar is systematically studied in the framework of continuum solids by adopting two idealized material models, viz. the dynamic rigid, perfectly plastic, locking （D-R-PP-L） model and the dynamic rigid, linear hardening plastic, locking （D-R-LHP-L） model, both considering the effects of strain-rate on the material properties. The shock wave speed relevant to these two models is derived. Consider the case of a bar made of one of such material with initial length L 0 and initial velocity v i impinging onto a rigid target. The variations of the stress, strain, particle velocity, specific internal energy across the shock wave and the cease distance of shock wave are all determined analytically. In particular the ＂energy conservation condition＂ and the ＂kinematic existence condition＂ as proposed by Tan et al. （2005） is re-examined, showing that the ＂energy conservation condition＂ and the consequent ＂critical velocity＂, i.e. the shock can only be generated and sustained in R-PP-L bars when the impact velocity is above this critical velocity, is incorrect. Instead, with elastic deformation, strain-hardening and strain-rate sensitivity of the cellular materials being considered, it is appropriate to redefine a first and a second critical impact velocity for the existence and propagation of shock waves in cellular solids. Starting from the basic relations for shock wave propagating in D-R-LHP-L cellular materials, a new method for inversely determining the dynamic stress-strain curve for cellular materials is proposed. By using e.g. a combination of Taylor bar and Hopkinson pressure bar impact experimental technique, the dynamic stress-strain curve of aluminum foam could bedetermined. Finally, it is demonstrated that this new formulation of shock theory in this one-dimensional stress state can be generalized to shocks in a one-dimensional strain state, i.e. for the case of plate impact on cellular materials, by simply making proper

关键词： Cellular solids 1D shock theory D-R-PP-L model D-R-SHP-L model Energy conservation across shock Critical velocities

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Regulation of graphdiyne-based nanozymes with enhanced oxidaselike activity by cobalt and nitrogen codoping

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Nano Research 2025年第1期18卷 21-29页

作者： Jiali Liu Xiaoli Wang Yongfu Lian Xue Wang Xiuxiu Wang Xingfa Gao Baoyun Sun Xihong Guo CAS Key Laboratory for Biomedical Effects of Nanomaterial&Nanosafety Institute of High Energy PhysicsChinese Academy of ScienceBeijing 100049China Key Laboratory of Functional Inorganic material Chemistry Ministry of EducationSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China Laboratory of Theoretical and Computational Nanoscience National Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

The development of nanozymes with excellent intrinsic oxidase-like activity and specificity has received increasing ***(GDY)could be a promising choice for designing nanozymes with enhanced oxidase(OXD)-like activity due to its unique structure and ***,Co-N-GDY with high OXD activity but no peroxidase(POD)activity was synthesized by codoping of cobalt(Co)and nitrogen(N)into GDY and compared with other GDY-based nanozymes(including GDY,Co-GDY,and N-GDY).Upon analyzing the doping effect of Co and N on the OXD-like and POD-like activities,we found that the combination of Co and N in GDY played a significant role in enhancing the OXD-like activity,and even reversed the POD-like activity of N-GDY to OXD-like activity of *** electrochemical experiment and the theoretical calculations provided an explanation for the mechanism and showed that the activity was closely linked to the reduction ability of O_(2) or H_(2)O_(2) on the nanozyme substrates,which was determined by the ratedetermining step of the catalytic reaction.

关键词： nanozymes oxidase-like activity graphdiyne heteroatom doping regulation

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The detection, extraction and parameter estimation of extreme-mass-ratio inspirals with deep learning

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 86-96页

作者： Qianyun Yun Wen-Biao Han Yi-Yang Guo He Wang Minghui Du Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Shanghai Astronomical Observatory Chinese Academy of Sciences School of Physics and Astronomy Shanghai Jiao Tong University School of Astronomy and Space Science University of Chinese Academy of Sciences Taiji Laboratory for Gravitational Wave Universe (Beijing/Hangzhou) University of Chinese Academy of Sciences Lanzhou center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Province Key Laboratory of Quantum Theory and Applications of MoE Lanzhou University Institute of Theoretical Physics & Research center of Gravitation Lanzhou University International Centre for Theoretical Physics Asia-Pacific (ICTP-AP) University of Chinese Academy of Sciences (UCAS) center for Gravitational Wave Experiment National Microgravity Laboratory Institute of Mechanics Chinese Academy of Sciences

One of the primary goals of space-borne gravitational wave detectors is to detect and analyze extreme-mass-ratio inspirals(EMRIs). This task is particularly challenging because EMRI signals are complex, lengthy, and faint. In this work, we introduce a2-layer convolutional neural network(CNN) approach to detect EMRI signals for space-borne detectors, achieving a true positive rate(TPR) of 96.9% at a 1% false positive rate(FPR) for signal-to-noise ratio(SNR) from 50 to 100. Especially, the key intrinsic parameters of EMRIs such as the mass, spin of the supermassive black hole(SMBH) and the initial eccentricity of the orbit can also be inferred directly by employing a neural network. The mass and spin of the SMBH can be determined at 99% and 92% respectively. This will greatly reduce the parameter spaces and computing cost for the following Bayesian parameter *** model also has a low dependency on the accuracy of the waveform model. This study underscores the potential of deep learning methods in EMRI data analysis, enabling the rapid detection of EMRI signals and efficient parameter estimation.

关键词： gravitational wave EMRIs deep-learing

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Prediction and optimization of flue pressure in sintering process based on SHAP

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International Journal of Minerals,Metallurgy and materials 2025年第2期32卷 346-359页

作者： Mingyu Wang Jue Tang Mansheng Chu Quan Shi Zhen Zhang School of Metallurgy Northeastern UniversityShenyang 110819China Liaoning Low-Carbon Steelmaking Technology Engineering Research center Northeastern UniversityShenyang 110819China Engineering Research center of Frontier Technologies for Low-Carbon Steelmaking(Ministry of Education) Shenyang 110819China

Sinter is the core raw material for blast *** pressure,which is an important state parameter,affects sinter *** this paper,flue pressure prediction and optimization were studied based on the shapley additive explanation(SHAP)to predict the flue pressure and take targeted adjustment ***,the sintering process data were collected and processed.A flue pressure prediction model was then constructed after comparing different feature selection methods and model algorithms using SHAP+extremely random-ized trees(ET).The prediction accuracy of the model within the error range of±0.25 kPa was 92.63%.SHAP analysis was employed to improve the interpretability of the prediction *** effects of various sintering operation parameters on flue pressure,the relation-ship between the numerical range of key operation parameters and flue pressure,the effect of operation parameter combinations on flue pressure,and the prediction process of the flue pressure prediction model on a single sample were analyzed.A flue pressure optimization module was also constructed and analyzed when the prediction satisfied the judgment *** operating parameter combination was then *** flue pressure was increased by 5.87%during the verification process,achieving a good optimization effect.

关键词： sintering process flue pressure shapley additive explanation prediction optimization

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Onsager principle as a tool for approximation

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Chinese Physics B 2015年第2期24卷 1-6页

作者： Masao Doi center of Soft Matter Physics and Its applications Beihang University

Onsager principle is the variational principle proposed by Onsager in his celebrated paper on the reciprocal *** principle has been shown to be useful in deriving many evolution equations in soft matter *** the principle is shown to be useful in solving such equations *** examples are discussed：the diffusion dynamics and gel *** examples show that the present method is novel and gives new results which capture the essential dynamics in the system.

关键词： reciprocal relation dissipation function Rayleighian slow variable diffusion dynamics gel dynamics

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Temperature Effects on the Microstructures of Mg-Gd-Y Alloy Processed by Multi-direction Impact Forging

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Acta Metallurgica Sinica(English Letters) 2020年第2期33卷 243-251页

作者： S.S.A.Shah D.Wu R.S.Chen G.S.Song School of material Science and Engineering Anhui University of Technology The Group of Magnesium Alloys and Their applications Institute of Metal ResearchChinese Academy of Sciences

A high strain rate multi-directional impact forging(MDIF) was applied to a solutionized Mg-Gd-Y-Zr alloy in the temperature range of 350-500℃.Results demonstrate that the dominant deformation mode is twinning at a temperature below 400℃,whereas at a medium temperature of 450℃ considerable continuous dynamic recrystallization was promoted by{10-12} extension *** a higher temperature of 500℃,twinning activation was *** DRX grains were observed but their sizes were much bigger than those resulting from the MDIFed 50 passes at 450℃,which are ascribed to the larger grain boundary mobility and atomic diffusion at 500℃.Moreover,a non-basal weak texture was gained afterward MDIF at each temperature,which is credited to the MDIF process and the minor strain applied in each pass.

关键词： Magnesium alloys Twinning Dynamic recrystallization Forging Texture

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Quantitative XRD Analysis of Cement Clinker by the Multiphase Rietveld Method

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Journal of Wuhan University of Technology(materials Science) 2003年第3期18卷 56-59页

作者：洪汉烈 The center for material Research and Testing Wuhan University of Technology

Quantitative phase analysis of Portland cement clinker samples was performed using an adaptation of the Rietveld *** Rietveld quantitative analysis program,originally in Fortran 77 code,was significantly modified in visual basic code with windows 9X graph user interface,which is free from the constraint of direct utilizable memory 640 k,and can be conveniently operated under the windows *** Rietveld quantitative method provides numerous advantages over conventional XRD quantitative method,especially in the intensity anomalies and superposition *** of its use are given with the results from other *** is concluded that,at present,the Rietveld method is the most suitable one for quantitative phase analysis of Portland cement clinker.

关键词： microscopic analysis clinker Portland cement Rietveld method

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