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Effect of thermal annealing on the microstructure, mechanical properties and residual stress relaxation of pure titanium after deep rolling treatment

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Journal of Materials Science & Technology 2019年第3期35卷 409-417页

作者： Jie Huang Kai-Ming Zhang Yun-Fei Jia Cheng-Cheng Zhang Xian-Cheng Zhang Xian-Feng Ma Shan-Tung Tu Key Laboratory of Pressure Systems and Safety Ministry of Education School of Mechanical and Power Engineering East China University of Science and Technology AECC Commercial Aircraft Engine Co. Ltd. Shanghai Engineering Research Center for Commercial Aircraft Engine Sino-French Institute of Nuclear Engineering and Technology SunYat-Sen University

The aim of this paper was to investigate the effect of thermal annealing on the microstructure, mechanical properties, and residual stress relaxation of deep rolled pure titanium. The microstructure and mechanical properties of the surface modified layer were analyzed by metallographic microscopy, transmission electron microscope and in-situ tensile testing. The results showed that the annealed near-surface layer with fine recrystallized grains had increased ductility but decreased strength after annealing below the recrystallization temperature, where the tensile strength was still higher than that of the substrate. After annealing at the recrystallization temperature, the recrystallized near-surface layer had smaller grain size,similar tensile strength, and higher proportional limit, comparable to those of the substrate. Moreover, the residual stress relaxation showed evidently different mechanisms at three different temperature regions:low temperature(T≤ 0.2 Tm), medium temperature(T≈(0.2–0.3) Tm), and high temperature(T≥ 0.3 Tm).Furthermore, a prediction model was proposed in terms of modification of Zener-Wert-Avrami model,which showed promise in characterizing the residual stress relaxation in commercial pure Ti during deep rolling at elevated temperature.

关键词： Deep rolling Ultra-fine grain Tensile strength Microstructure Residual stress

Effect of Stress Ratio on the Fatigue Crack Propagation Behavior of the Nickel-based GH4169 Alloy

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Acta Metallurgica Sinica(English Letters) 2017年第9期30卷 809-821页

作者： Shen Ye Jian-Guo Gong Xian-Cheng Zhang Shan-Tung Tu Cheng-Cheng Zhang Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyMeilongRoad 130Xuhui DistrictShanghai 200237People'sRepublic of China AECC Commercial Aircraft Engine Co.LTD ShanghaiEngineering Research Center for Commercial Aircraft EngineShanghai 201108People's Republic of China

The fatigue crack growth behavior of the newly developed GH4169 nickel-based alloy at a maximum stress of 700 MPa and different stress ratios was investigated in the present work employing the specimens with a single micro- notch at a frequency of 129 Hz at room temperature. The results demonstrate a typical three-stage process of fatigue crack propagation processing from the microstructurally small crack （MSC） stage to the physically small crack （PSC） stage, and finally to the long crack stage. The crack growth rate in the MSC stage is relatively high, while the crack growth rate in the PSC stage is relatively low. A linear function of crack-tip reversible plastic zone size was proposed to predict the crack growth rate, indicating an adequate prediction solution.

关键词： Fatigue crack Crack growth rate Stress ratio Nickel-based alloy

Active and passive compliant force control of ultrasonic surface rolling process on a curved surface

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Chinese Journal of Aeronautics 2022年第7期35卷 289-299页

作者： Kaiming ZHANG Ji WANG Yixin LIU Shuang LIU Xiancheng ZHANG School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China

Ultrasonic surface rolling process(USRP)is one of the effective mechanical surface enhancement *** the USRP,unstable static force will easily do harm to the surface *** order to achieve a higher surface quality on the part with a curved surface,an active and passive compliant USRP system has been *** compliant USRP tool can produce the natural obedience deformation along the part *** control based on the fuzzy Proportional-integral-derivative(PID)method is then designed to maintain the static force during the *** have been performed on a real aero-engine blade with curved *** is proved that the deigned active and passive compliant USRP system can significantly reduce the force variation from 42.2 N to 4.2 N,and achieve a uniform surface quality after processing.

关键词： Active and passive compliant Curved surface Force control Surface integrity Ultrasonic surface rolling process

Combined insertion of basic and non-basic amino acids at hemagglutinin cleavage site of highly pathogenic H7N9 virus promotes replication and pathogenicity in chickens and mice

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Virologica Sinica 2022年第1期37卷 38-47页

作者： Aobaixue Zhou Jiahao Zhang Huanan Li Qiang Xu Yiqun Chen Bo Li Wanying Liu Guanming Su Xingxing Ren Guangjie Lao Baozheng Luo Ming Liao Wenbao Qi College of Veterinary Medicine South China Agricultural UniversityGuangzhou510642China National Avian Infiuenza Para-reference Laboratory South China Agricultural UniversityGuangzhou510642China Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou510642China Gongbei Customs Technology Center Zhuhai519000China National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control Guangzhou510642China Key Laboratory of Zoonoses Ministry of AgricultureGuangzhou510642China Key Laboratory of Animal Vaccine Development Ministry of AgricultureGuangzhou510642China Key Laboratory of Zoonoses Prevention and Control of Guangdong Province Guangzhou510642China

Since mid-2016,the low pathogenic H7N9 influenza virus has evolved into a highly pathogenic(HP)phenotype in China,raising many concerns about public health and poultry *** insertion of a“KRTA”motif at hemagglutinin cleavage site(HACS)occurred in the early stage of HP H7N9 *** the co-circulation,the HACS of HP-H7N9 variants were more polymorphic in birds and *** HP-H7N9 variants,unlike the H5 subtype virus,exhibited the insertions of basic and non-basic amino acids,the underlying function of those insertions and substitutions remains *** results of bioinformatics analysis indicated that the PEVPKRKRTAR/G motif of HACS had become the dominant motif in ***,we generated six H7N9 viruses bearing the PEIPKGR/G,PEVPKGR/G,PEVPKRKRTAR/G,PEVPKGKRTAR/G,PEVPKGKRIAR/G,and PEVPKRKRR/G ***,after the deletion of threonine and alanine(TA)at HACS,the H7N9 viruses manifested decreased thermostability and virulence in mice,and the PEVPKRKRTAR/G-motif virus is prevalent in birds and humans probably due to its increased transmissibility and moderate *** contrast,the insertion of non-basic amino acid isoleucine and alanine(IA)decreased the transmissibility in chickens and virulence in ***,the I335V substitution of H7N9 virus enhanced infectivity and transmission in chickens,suggesting that the combination of mutations and insertions of amino acids at the HACS promoted replication and pathogenicity in chickens and *** ongoing evolution of H7N9 increasingly threatens public health and poultry industry,so,its comprehensive surveillance and prevention of H7N9 viruses should be pursued.

关键词： H7N9 Highly pathogenic Cleavage site Basic and non-basic amino acids Pathogenicity

Microstructural Evolution, Mechanical Properties and Thermal Stability of Gradient Structured Pure Nickel

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Acta Metallurgica Sinica(English Letters) 2019年第8期32卷 951-960页

作者： Xiao Li Bo Guan Yun-Fei Jia Yun-Chang Xin Cheng-Cheng Zhang Xian-Cheng Zhang Shan-Tung Tu Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China School of Materials Science and Engineering Chongqing UniversityChongqing 400044China AECC Commercial Aircraft Engine Co.LTD Shanghai Engineering Research Center for Commercial Aircraft EngineShanghai 20110&China

The microstructural evolution of pure nickel treated by deep rolling(DR)technique with different indent depths was investigated by means of optical microscopy and transmission electron *** surface roughness,hardness and residual stress distribution along the depth from surface were ***,the DR-treated sample was annealed at temperatures from 300 to 700℃for 2 *** results reveal that dislocation movements are the fundamental mechanisms of gradient grain refinement during the DR *** increasing indent depth of the DR,the gradient microhardness on the cross section of sample significantly increases,the maximum compressive residual stress decreases,and the affecting region of residual stress *** results of thermal stability depict that the microstructure can be stable as temperature up to 300℃,and the abnormal grain growth and annealing twins are observed at 600℃.

关键词： Deep rolling Pure nickel-Microstructural evolution Mechanical properties Thermal stability

On the bramble way to Mg metal anodes in secondary Mg ion batteries

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Journal of Materials Science & Technology 2023年第19期150卷 175-189页

作者： Guodong Zou Jiawen Feng Xue Zhao Jinming Wang Yangyang Wang Weihao Yang Mengyao Wei Yimin Wang Lanjie Li Liqun Ren Carlos Fernandez Qiuming Peng State Key Laboratory of Metastable Materials Science and Technology School of Materials Science and EngineeringYanshan UniversityQinhuangdao 066004China Department of General Surgery First Hospital of QinhuangdaoHebei Medical UniversityQinhuangdao 066000China Chengde Iron and Steel Group Co. Ltd.HBIS Group Co.Ltd.Chengde 067102China Laboratory of Spinal Cord Injury and Rehabilitation Chengde Medical UniversityChengde 067000China School of Pharmacy and Life Sciences Robert Gordon UniversityAberdeen AB107GJUnited Kingdom

As a prospective alternative to lithium-ion batteries,rechargeable magnesium metal batteries(RMBs)have many unparalleled advantages,including direct use of Mg metal as the electrode;large nature abundance;intrinsically safe merits;high theoretical volumetric ***,there exist a large number of challenges on electrodes for their *** them,surface passivation,uneven deposition/dissolution,and corrosion are critical issues that severely hinder the development of Mg anodes in *** review gives a specific comprehensive,and in-depth summary of mechanisms relative to these ***,it displays the protection progresses of the Mg metal anode via three-dimensional host nanostructure fabrication,Mg alloys anode design,current collector modification,artificial solid-electrolyte interphase construction,and electrolyte ***,future perspectives and outlooks in developing the other blossom of these strategies for rechargeable Mg batteries are also *** overview provides significant guidance for designing and fabricating high-performance Mg metal anodes in secondary Mg batteries and boosting their commercial applications.

关键词： Mg metal anode Mg alloys Deposition/dissolution Dendrite Artificial solid-electrolyte interphase Mg ion battery

Twisted optical communications using orbital angular momentum

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Science China(Physics,Mechanics & Astronomy) 2019年第3期62卷 1-21页

作者： Jian Wang Wuhan National Laboratory for Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology

Angular momentum, a fundamental physical quantity, can be divided into spin angular momentum(SAM) and orbital angular momentum(OAM) in electromagnetic waves. Helically-phased or twisted light beams carrying OAM that exploit the spatial structure physical dimension of electromagnetic waves have benefited wide applications ranging from optical manipulation to quantum information processing. Using the two distinct properties of OAM, i.e., inherent orthogonality and unbounded states in principle, one can develop OAM modulation and OAM multiplexing techniques for twisted optical communications. OAM multiplexing is an alternative space-division multiplexing approach employing an orthogonal mode basis related to the spatial phase structure. In this paper, we review the recent progress in twisted optical communications using OAM in free space and fiber. The basic concept of momentum, angular momentum, SAM, OAM and OAM-carrying twisted optical communications,key techniques and devices of OAM generation/(de)multiplexing/detection, high-capacity spectrally-efficient free-space OAM links, fiber-based OAM links, and OAM processing functions are presented. Ultra-high spectral efficiency and petabit-scale freespace data links are achieved benefiting from OAM multiplexing. The key techniques and challenges of twisted optical communications are also discussed. Twisted optical communications using OAM are compatible with other existing physical dimensions such as frequency/wavelength, amplitude, phase, polarization and time, opening a possible way to facilitate continuous increase of the aggregate transmission capacity and spectral efficiency through N-dimensional multiplexing.

关键词： fiber optical communications free-space optical communications modulation multiplexing orbital angular momentum space-division multiplexing spectral efficiency twisted optical communications twisted light structured light

On-chip silicon photonic signaling and processing: a review

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Science Bulletin 2018年第19期63卷 1267-1310页

作者： Jian Wang Yun Long Wuhan National Laboratory for Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology

The arrival of the big data era has driven the rapid development of high-speed optical signaling and processing, ranging from long-haul optical communication links to short-reach data centers and highperformance computing, and even micro-/nano-scale inter-chip and intra-chip optical ***-chip photonic signaling is essential for optical data transmission, especially for chip-scale optical interconnects, while on-chip photonic processing is a critical technology for optical data manipulation or processing, especially at the network nodes to facilitate ultracompact data management with low power consumption. In this paper, we review recent research progress in on-chip photonic signaling and processing on silicon photonics platforms. Firstly, basic key devices (lasers, modulators, detectors)are introduced. Secondly, for on-chip photonic signaling, we present recent works on on-chip data transmission of advanced multi-level modulation signals using various silicon photonic integrated devices(microring, slot waveguide, hybrid plasmonic waveguide, subwavelength grating slot waveguide).Thirdly, for on-chip photonic processing, we summarize recent works on on-chip data processing of advanced multi-level modulation signals exploiting linear and nonlinear effects in different kinds of silicon photonic integrated devices (strip waveguide, directional coupler, 2D grating coupler, microring,silicon-organic hybrid slot waveguide). Various photonic processing functions are demonstrated, such as photonic switch, filtering, polarization/wavelength/mode (de)multiplexing, wavelength conversion,signal regeneration, optical logic and computing. Additionally, we also introduce extended silicon+photonics and show recent works on on-chip graphene-silicon photonic signal processing. The advances in on-chip silicon photonic signaling and processing with favorable performance pave the way to integrate complete optical communication systems on a monolithic chip and integrate silicon

关键词： Photonic integration Silicon photonics Photonic signaling Photonic processing Optical communications Optical interconnects

Low-cycle fatigue life prediction of a polycrystalline nickel-base superalloy using crystal plasticity modelling approach

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Journal of Materials Science & Technology 2020年第3期38卷 28-38页

作者： Guang-Jian Yuan Xian-Cheng Zhang Bo Chen Shan-Tung Tu Cheng-Cheng Zhang Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China The Institute for Advanced Manufacturing and Engineering Faculty of EngineeringEnvironment and ComputingCoventry UniversityCoventry CV65LZUK AECC Commercial Aircraft Engine Co.LTD Shanghai Engineering Research Center for Commercial Aircraft EngineShanghai 201108China

A crystal plasticity model is developed to predict the cyclic plasticity during the low-cycle fatigue of GH4169 *** plastic slip and energy dissipation as fatigue indicator parameters(FIPs)are used to predict fatigue crack initiation and the fatigue life until *** show that fatigue damage is most likely to initiate at triple points and grain boundaries where severe plastic slip and energy dissipation are *** predicted fatigue life until failure is within the scatter band of factor 2 when compared with experimental data for the total strain amplitudes ranging from 0.8%to 2.4%.Microscopically,the adjacent grain arrangements and their interactions account for the stress *** addition,different sets of grain orientations with the same total grain numbers of 150 were generated using the present *** show that different sets have significant influence on the distribution of stresses between each individual grain at the meso-scale,although little effect is found on the macroscopic length-scale.

关键词： Crystal plasticity Fatigue Finite element Life prediction Micro-mechanics Nickel-base superalloy