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Corrosion Fatigue Behavior of 7A85 Aluminum Alloy Thick Plate in NaCl Solution

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Acta Metallurgica Sinica(English Letters) 2015年第8期28卷 1047-1054页

作者： Zuo-Yan Ye Dao-Xin Liu xiao-Hua zhang xiao-ming zhang ming-Xia Lei Zhi Yang Corrosion and Protection Research Laboratory Northwestern Polytechnical University AVIC the First Aircraft Institute

The S–N curves of 7A85-T7452 aluminum alloy in laboratory air and in neutral 3.5 wt% NaCl solution were obtained by axial fatigue tests. Results show that the detrimental effect of the aggressive solution was not noticeable at high-cyclic-stress regions, but the effect was significant at low-stress region. Corrosion fatigue mechanism was discussed by corrosion morphology analysis, fracture surface analysis and microstructure characterization. It was found that the corrosion fatigue crack commonly initialed at the localized intergranular corrosion site. TEM analysis showed that the microstructures of 7A85-T7452 aluminum alloy were characterized by fine and homogeneously distributed matrix precipitates, as well as continually distributed anodic grain boundary precipitates. The types of microstructures are the reason for its intergranular corrosion susceptibility. The corrosion fatigue process of 7A85 aluminum alloy in 3.5 wt% NaCl solution can be divided into four stages： the crack initiation stage, the stable growth stage with low and high growth rate and the final rupture stage. The sodium chloride solution mainly affected the crack initiation stage and the stable growth stage with low growth rate, and when the crack growth rate reached a threshold, the effect was reduced.

关键词： Corrosion fatigue Intergranular corrosion Microstructure 7A85 aluminum alloy

Effect of cold rolling and annealing on microstructure and properties of a new resource-saving duplex stainless steel Fe–19Cr–0.6Al–12Mn

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Journal of Iron and Steel Research International 2020年第12期27卷 1420-1432页

作者： ming-ming Pan xiao-ming zhang Yong Chen Xiang-bin Su Peng Chen State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

An Fe-19Cr-0.6Al-12Mn duplex stainless steel with an optimized alloy composition of Ni replaced by Mn and Cr partially replaced by Al was developed to avoid the edge cracking, which is a common defect in the hot rolling of traditional twophase stainless steels. The newly developed duplex stainless steel could be hot-rolled in the single-phase ferrite (α) region by controlling rolling temperature and the single-phase ferrite microstructure was retained on water cooling. To obtain the two-phase stainless steel product with ferrite and austenite (γ) microstructure, cold rolling and annealing were carried out,and appropriate cold rolling reduction and annealing process parameters were determined. The significant impact of annealing on microstructure, mechanical properties and pitting resistance of the experimental steel was studied. It was observed that with the increase in cold rolling reduction, the number of γ nucleation points was dramatically increased leading to the precipitation of more γ at α grain boundaries after annealing. During annealing at 800 ℃ and with the increase in annealing time, the austenite fraction was increased with a lower rate and remained almost constant when the annealing time was greater than 4 h. With the increase in annealing temperature, the austenite fraction decreased gradually in the temperature range of 750-860 ℃. Good combination of strength, ductility and excellent pitting resistance was obtained by cold rolling to 80% reduction and annealing at 800 ℃ for 4 h. Grain refinement and the existence of Σ3 boundaries played a vital role in improving the pitting resistance of the experimental steel. With good combination of strength, ductility and corrosion resistance, the newly developed duplex stainless steel is expected to be a new resource-saving dual-phase stainless steel.

关键词： Resource-saving duplex stainless steel Edge cracking Rolling reduction Annealing Tensile property Pitting corrosion

Low-depth optical neural networks

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Chip 2022年第1期1卷 8-13页

作者： xiao-ming zhang Man-Hong Yung Department of Physics Southern University of Science and TechnologyShen-zhen 518055China Department of Physics City University of Hong KongTat Chee AvenueKowloonHong Kong SARChina Shenzhen Institute for Quan-tum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and TechnologyShen-zhen 518055China Shenzhen Key Laboratory of Quantum Science and En-gineering Southern University of Science and TechnologyShenzhen518055China

Optical neural network(ONNs)are emerging as attractive propos-als for machine-learning ***,the stability of ONNs decreases with the circuit depth,limiting the scalability of ONNs for practical *** we demonstrate how to compress the circuit depth to scale only logarithmically in terms of the dimension of the data,leading to an exponential gain in terms of noise *** low-depth(LD)-ONN is based on an architecture,called Optical Com-puTing Of dot-Product UnitS(OCTOPUS),which can also be applied individually as a linear perceptron for solving classification *** present both numerical and theoretical evidence showing that LD-ONN can exhibit a significant improvement on robustness,compared with previous ONN proposals based on singular-value decomposition.

关键词： optical neural networks photonic chip machine learning

Signifcant impact of cold-rolling deformation and annealing on damping capacity of Fe-Mn-Cr alloy

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Journal of Iron and Steel Research International 2020年第5期27卷 566-576页

作者： Bo Xia xiao-ming zhang R.D.K.Misra ming-ming Pan Yu-qian Wang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX 79668USA

The infuences of cold-rolling deformation and annealing on the damping capacity of Fe-19Mn-8Cr alloy were *** was observed that the cold-rolled Fe-19Mn-8Cr alloy with a reduction of 10%showed the relatively excellent damping capacity because of the relatively moreε-martensite and lower dislocation density,and the reduction of slopes of diferent damping curves increased along with increasing the cold-rolling ***,the subsequent annealing process can further enhance the damping *** 70%cold-rolling deformation,the austenite grain would grow up with the increase in the annealing temperature,which resulted in a signifcant change in the content and morphology ofε-martensite infuencing the damping capacity of the experimental *** damping capacity was optimum when annealed at 800°C for 30 min,displaying that the size ofε-martensite has a vital infuence on the damping capacity of the experimental *** study may enrich the fundamental knowledge about how to ameliorate the damping capacity of Fe-Mn-Cr damping steels.

关键词： Damping capacity Fe-19Mn-8Cr damping alloy ε-martensite α′-martensite Cold rolling

Investigating the elliptic anisotropy of identified particles in p-Pb collisions with a multi-phase transport model

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Nuclear Science and Techniques 2024年第2期35卷 160-169页

作者： Si-Yu Tang Liang Zheng xiao-ming zhang Ren-Zhuo Wan School of Mathematical and Physical Sciences Wuhan Textile UniversityWuhan 430200China School of Mathematics and Physics China University of Geosciences(Wuhan)Wuhan 430074China Key Laboratory of Quark and Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China Hubei Key Laboratory of Digital Textile Equipment Wuhan Textile UniversityWuhan 430200China School of Electronic and Electrical Engineering Wuhan Textile UniversityWuhan 430200China

The elliptic azimuthal anisotropy coefficient(v_(2))of the identified particles at midrapidity(|η|<0.8)was investigated in p-Pb collisions at√s_(NN)=5.02 TeV using a multi-phase transport model(AMPT).The calculations of differential v_(2)based on the advanced flow extraction method of light flavor hadrons(pions,kaons,protons,andΛ)in small collision systems were extended to a wider transverse momentum(p_(T))range of up to 8 GeV/c for the first *** string-melting version of the AMPT model provides a good description of the measured p_(T)-differential v_(2)of the mesons but exhibits a slight deviation from the baryon v_(2).In addition,we observed the features of mass ordering at low p_(T)and the approximate number-of-constituentquark(NCQ)scaling at intermediate p_(T).Moreover,we demonstrate that hadronic rescattering does not have a significant impact on v_(2)in p-Pb collisions for different centrality selections,whereas partonic scattering dominates in generating the elliptic anisotropy of the final *** study provides further insight into the origin of collective-like behavior in small collision systems and has referential value for future measurements of azimuthal anisotropy.

关键词： Azimuthal anisotropy Small collision systems Transport model

Synthesis of Mesoporous Silica and Ti-containing Molecular Sieves via A Novel Assembly

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Chinese Chemical Letters 2001年第8期12卷 737-740页

作者： Jing XIN Ji Shuan SUO xiao ming zhang State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000

Thermally stable mesoporous silica and Ti-containing molecular sieves have been synthesized at mild temperature using low-cost and biodegradable --- amphoteric tetradecyl betaine as template. The physicochemical chara... 详细信息

关键词： Synthesis meosoporous silica and Ti-containing molecular sieves amphoteric tetradecyl betaine novel assembly.

Effects of Offline Relaxation Quenching on Microstructure and Mechanical Properties of a Newly Designed High Performance Steel

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Journal of Iron and Steel Research International 2014年第4期21卷 459-463页

作者： Wen-zhen XIA Xian-ming ZHAO xiao-ming zhang Di WU State Key Laboratory of Rolling and Automation Northeastern University

The newly designed high performance tested steel was prepared by the process of vacuum induction furnace smelting and forging. According to the ideas of online relaxation and quenching intercritieal quenching-tempering （Q- L-T） process, effects of offline relaxation process on microstructure and mechanical properties of the tested steel were investigated. Offline results process was simulated using the MMS-300 thermal simulation testing apparatus and heat treating furnace. The results show that the microstructures are composed of bainite and martensite when the specimens are quenched in the austenite region. Once the specimens are ai〉cooled into the dual phase region, ferrite and granular bainite start to form. In the relaxation process, fine Nb（C, N） carbonitrides are precipitated first and then grow and coarsen. The microstructure is affected by process and determines mechanical properties. The Vickers hardness and yield strength （YS） first rise then fall when the relaxation temperature drops in austenite region, and then decline dramatically in dual phase region. When the relaxation time is 20 s, the tensile strength reaches the peak （1034 MPa）, and at that time YS is 872 MPa, elongation is 17.7% and Charpy V-notch impact energy is 171 J at -20℃. When the relaxation time increases to 100 s, the yield and tensile strengths are 750 and 934 MPa respectively, elon- gation is 18.6% and Charpy V-notch impact energy is 165 J at -20℃.

关键词： high performance steel offline relaxation process microstrueture mechanical property

Effects of Prior Corrosion with and Without Stress on the Mechanical Properties of 7475-T761 Aluminum Alloy

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Acta Metallurgica Sinica(English Letters) 2015年第5期28卷 608-613页

作者： Zuo-Yan Ye Dao-Xin Liu Meng Yuan xiao-ming zhang Zhi Yang ming-Xia Lei Corrosion and Protection Research Laboratory Northwestern Polytechnical University Aviation Industry Corporation of China the First Aircraft Institute

The effect of prior corrosion on the mechanical properties of 7475-T761 aluminum alloy was investigated by immersion test, stress corrosion test, cathode charge method and electrochemical polarization test. Results show that prior corrosion in the solution with 3 wt% NaC1 and 0.5 wt% H202 leads to mechanical properties deterioration of 7475-T761 aluminum alloy. Moreover, the elongation decreases significantly. This is mainly attributed to electrochemical corrosion and hydrogen embrittlement, in which corrosion plays a major role. Tensile stress promotes the degradation of the mechanical properties by accelerating the pitting corrosion and hydrogen embrittlement.

关键词： Prior corrosion Corrosion with stress 7475 aluminum alloy Mechanical properties Hydrogen embrittlement

Current research status of transarterial therapies for hepatocellular carcinoma

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World Journal of Gastrointestinal Oncology 2024年第9期16卷 3752-3760页

作者： Mao-Ting Zhou Peng zhang Qi Mao xiao-Qin Wei Lin Yang xiao-ming zhang Department of Radiology Interventional Medical CenterScience and Technology Innovation CenterThe Affiliated Hospital of North Sichuan Medical CollegeNanchong 637000Sichuan ProvinceChina School of Medical Imaging North Sichuan Medical CollegeNanchong 637000Sichuan ProvinceChina

With continuous advancements in interventional radiology,considerable progress has been made in transarterial therapies for hepatocellular carcinoma(HCC)in recent years,and an increasing number of research papers on transarterial therapies for HCC have been *** this editorial,we comment on the article by Ma et al published in the recent issue of the World Journal of Gastrointestinal Oncology:“Efficacy and predictive factors of transarterial chemoembolization combined with lenvatinib plus programmed cell death protein-1 inhibition for unresectable HCC”.We focus specifically on the current research status and future directions of transarterial *** the future,more studies are needed to determine the optimal transarterial local treatment for *** the emergence of checkpoint immunotherapy modalities,it is expected that the results of trials of transarterial local therapy combined with systemic therapy will bring new hope to HCC patients.

关键词： Hepatocellular carcinoma Transarterial therapies Transarterial chemoembolization Hepatic artery infusion chemotherapy Transarterial embolization Transarterial radioembolization