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Oxidation behavior of 4774DD1 Ni-based single-crystal superalloy at 980℃ in air

China Foundry 2024年第2期21卷 116-124页

作者： Yu Fang Ya-zhou Li Qiang Yang Qun-gong He Xiu-fang Gong Qian Duan Hai-yang Song Fu Wang Qiong-yuan Zhang Hong Zeng State Key Laboratory of Long-Life High Temperature Materials Dongfang Turbine Co.Ltd.Deyang 618000SichuanChina State Key Laboratory for Manufacturing System Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China

The oxidation behavior of a novel Ni-based single-crystal 4774DD1 superalloy for industrial gas turbine applications was investigated by the isothermal oxidation at 980℃ and discontinuous oxidation weight gain *** phase constitution and morphology of surface oxides and the characteristics of the crosssection oxide film were analyzed by XRD,SEM and *** show that the oxidation kinetics of the 4774DD1 superalloy follows the cubic law,indicating its weak oxidation resistance at this *** the oxidation time increases,the composition of the oxide film evolves as following:One layer consisting of a bottom Al_(2)O_(3)sublayer and an upper(Al_(2)O_(3)+NiO)mixture sublayer after oxidized for 25 ***,two layers composed of an outermost small NiO discontinuous grain layer and an internal layer for 75 *** internal layer is consisted of the bottom Al_(2)O_(3)sublayer,an intermediate narrow CrTaO_(4)sublayer,and an upper(Al_(2)O_(3)+NiO)mixture *** two layers comprising an outermost relative continuous NiO layer with large grain size and an internal layer as the oxidation time increases to 125 *** internal layer is composed of the upper(Al_(2)O_(3)+NiO)mixture sublayer,an intermediate continuous(CrTaO_(4)+NiWO_(4))mixture sublayer,and a bottom Al_(2)O_(3)***,three layers consisting of an outermost(NiAl2O_(4)+NiCr2O_(4))mixture layer,an intermediate(CrTaO_(4)+NiWO_(4))mixture layer,and a bottom Al_(2)O_(3)layer for 200 h.

关键词： nickel-base single crystal superalloy oxidation kinetics oxide film microstructure mechanism

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Correlating dynamic relaxation and viscoelasticity in metallic glasses

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Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 81-90页

作者： GuangHui Xing Qi Hao Fan Zhu Yun-Jiang Wang Yong Yang Hidemi Kato Eloi Pineda Si Lan JiChao Qiao School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 710072China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China Department of Mechanical Engineering College of EngineeringCity University of Hong KongHong Kong 999077China Department of Materials Science and Engineering College of EngineeringCity University of Hong KongHong Kong 999077China Institute for Materials research Tohoku UniversitySendai 980-8577Japan Department of Physics Institute of Energy TechnologiesUniversitat Politècnica de CatalunyaBarceona 9Spain School of Material Science and Engineering Herbert Gleiter Institute of NanoscienceNanjing University of Science and Technology.Nanjing 210094China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Northwestern Polytechnical UniversityXi'an 710072China

Relaxation dynamics,essential for the structural evolution of non-equilibrium systems like glassy materials,remain ***,we explore relaxation dynamics and viscoelastic properties in three types of metallic glasses with distinctβrelaxation *** systems with significantβrelaxation,stress relaxation and creep experiments reveal a transition from two-step to one-step relaxation with rising ***,such a phenomenon is absent in systems with weakerβ*** model the two-step relaxation process using a double Kohlrausch-Williams-Watts equation,and the obtained relaxation times elegantly adhere to the Arrhenius *** combining fitted activation energies with theoretical analysis,we conclusively attribute these relaxation processes toβrelaxation andαrelaxation,***,we analyze the relaxation time spectra of two processes and establish a comprehensive picture linking dynamic relaxation with *** study provides new strategies for probing the complex relaxation behaviors of glasses from the perspective of viscoelasticity.

关键词： creep relaxation glasses

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Effects of timber infill walls on the seismic behavior of traditional Chinese timber frames

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Earthquake Engineering and Engineering Vibration 2022年第4期21卷 999-1018页

作者： Xie Qifang Zhang Baozhuang Li Shengying Wu Fanfan Yang Huifeng Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China School of Civil Engineering Xi’an University of Architecture and TechnologyXi′an 710055China China Coal Xi′an Design Engineering Co. Ltd.Xi′an 710055China College of Civil Engineering Nanjing Tech UniversityNanjing 211816China

This study investigates the enhanced effect of timber infill walls on the seismic behavior of traditional Chinese timber *** 1/2 scaled traditional Chinese timber infill walls(TIWs),two 1/2 scaled timber frames with timber infill walls(TFTIWs)and one 1/2 scaled timber frame(TF)were fabricated and tested under low-cyclic reversed *** failure modes,strength,stiffness,and energy consumption capacity of the TIWs and the TFTIWs were obtained,and the effects of the TIWs on the seismic performance of the TFTIWs were *** results showed that the TIWs can increase the stiffness and ultimate bearing capacity of the TF,up to 60%and 80%,*** strength degradation coefficient of the TFTIWs was slightly higher than that of the TF when the inter-story drift ratio exceeded 0.02 rad,and the TIWs helped to mitigate the strength degradation of the *** was also found that the TFTIWs had a higher cumulative energy dissipation when compared with the TF(up to a 60%increase),indicating the TIWs had reasonably good energy dissipation *** the TIWs generated a solid contribution to the carrying capacity and energy dissipation of the TF,the lateral drift thresholds were 1/100 and 1/43 of the column height,***,the TIWs and TFTIWs presented a good ductility,and the TIW could effectively reduce the pull-out amount of the tenon from the mortise of the TF;however,the TIWs had little influence on the stiffness degradation level or improvement of the ductility of the TF.

关键词： traditional Chinese timber frame timber infill wall mortise-tenon joint cyclic loading test seismic behavior

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Finite Control Set Model Predictive Torque Control Using Sliding Model Control for Induction Motors

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CES Transactions on Electrical Machines and Systems 2021年第3期5卷 262-270页

作者： Yanqing Zhang Zhonggang Yin Wei Li Jing Liu Yanping Xu the School of Electrical Engineering Xi'an University of TechnologyXi'an710048China the VEICHI Electric Technology Co. Ltd.Suzhou215124China the Department of Electronic Engineering Xi'an University of TechnologyXi'an710048China

Finite control set model predictive torque control(FCS-MPTC)has become increasingly prevalent for induction motors(IM)owing to its simple concept,easy incorporation of constraints and strong *** traditional FCS-MPTC speed controller design,a classical proportional integral(PI)controller is typically chosen to generate the torque ***,the PI controller is dependent on system parameters and sensitive to the load torque variation,which seriously affects control *** this paper,a model predictive torque control using sliding mode control(MPTC+SMC)for IM is proposed to enhance the robust performance of the drive ***,the influence of the parameter mismatches for FCS-MPTC is ***,the shortcomings of traditional PI controller are ***,the proposed MPTC+SMC method is designed,and the MPTC+PI and MPTC+SMC are compared ***,experimental results demonstrate the correctness and effectiveness of the proposed MPTC+*** comparison with MPTC+PI,MPTC+SMC has the better dynamic performance and stronger robust performance against parameter variations and load disturbance.

关键词： Induction motor Model predictive torque control Sliding mode control robustness

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Programmable Metasurface for Simultaneously Wireless Information and Power Transfer System

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ZTE Communications 2022年第2期20卷 48-62页

作者： CHANG Mingyang HAN Jiaqi MA Xiangjin XUE Hao WU Xiaonan LI Long CUI Tiejun Key Laboratory of High-Speed Circuit Design and EMC of Ministry of Education School of Electronic EngineeringXidian UniversityXi’an 710071China State Key Laboratory of Millimeter Waves Southeast UniversityNanjing 210096China

Implementing self-sustainable wireless communication systems is urgent and challenging for 5G and 6G *** this paper,we elaborate on a system solution using the programmable metasurface(PMS)for simultaneous wireless information and power transfers(SWIPT),offering an optimized wireless energy management *** transmitting and receiving sides of the proposed solution are presented in *** the transmitting side,employing the wireless power transfer(WPT)technique,we present versatile power conveying strategies for near-field or far-field targets,single or multiple targets,and equal or unequal power *** the receiving side,utilizing the wireless energy harvesting(WEH)technique,we report our work on multi-functional rectifying metasurfaces that collect the wirelessly transmitted energy and the ambient *** importantly,a numerical model based on the plane-wave angular spectrum method is investigated to accurately calculate the radiation fields of PMS in the Fresnel and Fraunhofer *** this model,the efficiencies of WPT between the transmitter and the receiver are ***,future research directions are discussed,and integrated PMS for wireless information and wireless power is outlined.

关键词： programmable metasurface simultaneously wireless information and power transfers wireless energy harvesting wireless power transfer

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Review of advanced road materials, structures, equipment, and detection technologies

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Journal of Road Engineering 2023年第4期3卷 370-468页

作者： JRE Editorial Office Maria Chiara Cavalli De Chen Qian Chen Yu Chen Augusto Cannone Falchetto Mingjing Fang Hairong Gu Zhenqiang Han Zijian He Jing Hu Yue Huang Wei Jiang Xuan Li Chaochao Liu Pengfei Liu Quantao Liu Guoyang Lu Yuan Ma Lily Poulikakos Jinsong Qian Aimin Sha Liyan Shan Zheng Tong B.Shane underwood Chao Wang Chaohui Wang Di Wang Haopeng Wang Xuebin Wang Chengwei Xing Xinxin Xu Min Ye Huanan Yu Huayang Yu Zhe Zeng You Zhan Fan Zhang Henglong Zhang Wenfeng Zhu Editorial Office of Journal of Road Engineering Chang’an UniversityXi’an 710064China Department of Civil and Architectural Engineering KTH Royal Institute of TechnologyStockholm 10044Sweden School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China School of Highway Chang’an UniversityXi’an 710064China Department of Civil Engineering Aalto UniversityAalto 00076Finland School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China National Engineering research Center of Highway Maintenance Equipment Chang’an UniversityXi’an 710064China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina School of Transportation Southeast UniversityNanjing 211189China Institute for Transport Studies University of LeedsLeeds LS29JTUK School of Traffic and Transportation Engineering Changsha University of Science&TechnologyChangsha 410114China Institute of Highway Engineering RWTH Aachen UniversityAachen 52074Germany State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Department of Architecture and Civil Engineering City University of Hong KongHong KongChina Empa Swiss Federal Laboratories for Materials Science and TechnologyDübendorf 8600Switzerland College of Transportation Engineering Tongji UniversityShanghai 200092China School of Transportation Science and Engineering Harbin Institute of TechnologyHarbin 150090China Department of Civil Constructionand Environmental EngineeringNorth Carolina State UniversityRaleighNC 27695USA Department of Road&Urban Railway Engineering Beijing University of TechnologyBeijing 100124China Department of Civil and Environmental Engineering University of LiverpoolLiverpool L693GHUK School of Civil Engineering&Transportation South China University of TechnologyGuangzhou 510640China College of Civil Engineering Hunan UniversityChangsha 410082China

As a vital and integral component of transportation infrastructure,pavement has a direct and tangible impact on socio-economic *** recent years,an influx of groundbreaking and state-of-the-art materials,structures,equipment,and detection technologies related to road engineering have continually and progressively emerged,reshaping the landscape of pavement *** is a pressing and growing need for a timely summarization of the current research status and a clear identification of future research directions in these advanced and evolving ***,Journal of Road Engineering has undertaken the significant initiative of introducing a comprehensive review paper with the overarching theme of“advanced road materials,structures,equipment,and detection technologies”.This extensive and insightful review meticulously gathers and synthesizes research findings from 39 distinguished scholars,all of whom are affiliated with 19 renowned universities or research institutions specializing in the diverse and multidimensional field of highway *** covers the current state and anticipates future development directions in the four major and interconnected domains of road engineering:advanced road materials,advanced road structures and performance evaluation,advanced road construction equipment and technology,and advanced road detection and assessment technologies.

关键词： Road engineering Advanced road material Advanced road structure Advanced road equipment Advanced road detection technology

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