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Improvement of microstructure and fatigue performance of wire-arc additive manufacture d 4043 aluminum alloy assiste d by interlayer friction stir processing

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Journal of Materials Science & Technology 2023年第2期133卷 183-194页

作者： Changshu He Jingxun Wei Ying Li zhiqiang zhang Ni Tian Gaowu Qin Liang Zuo School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials Northeastern UniversityShenyang 110819China Research Center for Metallic Wires Northeastern UniversityShenyang 110819China

To expand the application of wire-arc additive manufacturing(WAAM)in aluminum alloy forming com-ponents,it is vitally important to reduce the porosity,refine microstructure,and thereby improve the mechanical properties of the *** this study,the interlayer friction stir processing(FSP)tech-nique was employed to assist the WAAM of 4043 Al-Si alloy,and the related effects on the microstruc-ture evolutions and mechanical properties of the fabricated builds were systematacially *** compared to the conventional WAAM processing of Al-Si alloy,it was found that the introduction of in-terlayer FSP can effectively eliminate the pores,and both theα-Al dendrites and Si-rich eutectic network were severely broken up,leading to a remarkable enhancement in ductility and fatigue *** average yield strength(YS)and ultimate tensile strength(UTS)of the Al-based components produced by the combination of WAAM and interlayer FSP methods were 88 and 148 MPa,***,the elongation(EL)of 37.5%and 28.8%can be achieved in the horizontal and vertical directions,*** anisotropy of EL was attributed to the inhomogeneous microstructure in the stir zone(SZ).Notably,the stress concentration can be effectively reduced by the elimination of porosity and Si-rich eu-tectic network fragmentation by the interlayer FSP,and thus the fatigue behavior was improved with the fatigue strength and elongation increased by∼28%and∼108.7%,*** is anticipated that this study will provide a powerful strategy and theoretical guidance for the WAAM fabrication of Al-based alloy components with high ductility and fatigue performance.

关键词： Wire-arc additive manufacturing(WAAM) Friction stir processing(FSP) Aluminum alloy Microstructure evolution Fatigue performance

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Effects of Y Content on the Microstructures and Mechanical Properties of Mg-5Zn-xY-0.6Zr Alloys

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Journal of Wuhan University of Technology(Materials Science) 2019年第1期34卷 138-144页

作者： YIN Siqi zhang zhiqiang Key Lab of Electromagnetic Processing of Materials Ministry of Education College of Materials Science and Engineering Northeastern University

Three as-cast and as-extruded Mg-5Zn-x Y-0.6Zr(x=5 wt%, 8 wt%, 11 wt%) alloys were prepared, and the effects of Y content on the microstructures and mechanical properties of the alloys were investigated. The results show that the investigated Mg-Zn-Y-Zr alloys mainly consist of a-Mg, X-Mg12 YZn and minor amount of W-Mg_3Y_2Zn_3 phases. The volume fraction of X-Mg_(12) YZn phase increases and that of W-Mg_3Y_2Zn_3 phase decreases with the rising of Y content in the alloys. The as-extruded Mg-5Zn-11Y-0.6Zr alloy owns the optimal ultimate tensile strength and yield strength of 429 and 351 MPa, respectively. Mg-5Zn-5Y-0.6Zr alloy owns the maximum elongation of 13.6%.

关键词： Mg-Zn-Y-Zr alloy indirect extrusion ternary phase mechanical property

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Inhibition effect on microbiologically influenced corrosion of Ti-6Al-4V-5Cu alloy against marine bacterium Pseudomonas aeruginosa

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Journal of Materials Science & Technology 2022年第14期109卷 282-296页

作者： Mohammed Arroussi Qing Jia Chunguang Bai Shuyuan zhang Jinlong Zhao Zhizhou Xia zhiqiang zhang Ke Yang Rui Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230022China

With rapid development of marine infrastructures,materials with better biocorrosion resistance and antibiofouling performance will be highly ***6Al4V alloy is susceptible to the *** inhibition to the microbiologically influenced corrosion of Ti6Al4V-5Cu alloy against Pseudomonas aeruginosa was investigated using antibacterial test,electrochemical techniques,surface analysis,and weight loss test conducted for 2.5 *** a sputtering depth of 0 nm,the passive film of Ti6Al4V-5Cu alloy was mainly composed of ideal oxide TiO_(2).With increasing sputtering thickness to 6 nm,Ti_(2)O_(3)and TiO were detected with a relative fraction of 14.6%and 14.8%,respectively,in the oxide layer of Ti6Al4V-5Cu *** contrast,the outermost layer of Ti6AlV alloy was predominantly composed of TiO_(2)but Ti_(2)O_(3)(22.8%),Al_(2)O_(3)and V_(2)O_(5) were also *** increasing sputtering depth to 6 nm,fitting revealed the presence of Ti_(2)O_(3)and TiO with relative fractions of 25.3%and 35.8%,***,a spot of TiO(8%)was also observed at 12 nm in the oxide layer of Ti6Al4V *** the addition of Cu into Ti6Al4V alloy generated the self-healing property of passive film in the presence of ***,it also reduced resistance to corrosion in general condition.

关键词： Titanium alloy Biocorrosion inhibition Passive film P.aeruginosa

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Multi-site anchoring of single-molecule for efficient and stable perovskite solar cells with lead shielding

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Journal of Energy Chemistry 2023年第12期87卷 390-399,I0010页

作者： Zhengyan He Shufang zhang Yushuang Gao Quanming Geng Xiangrui Jia Shuo Yang zhiqiang zhang Yanpu Zheng Yanqiang Hu Changlin Yao Qi zhang School of Physics and Photoelectronic Engineering Ludong UniversityYantai 264025ShandongChina College of Chemistry and Chemical Engineering Nantong UniversityNantong 226001JiangsuChina

The emergence of perovskite solar cells(PSCs) has greatly promoted the progress of photovoltaic *** rapid development of PSCs has been driven by the advances in optimizing perovskite films and their adjacent ***,the polycrystalline perovskite layers in most highly efficient PSCs still contain various defects that greatly limit photovoltaic performance and stability of the ***,we introduce a multifunctional additive ethylene diamine tetra methylene phosphonic sodium(EDTMPS) with multiple anchor points into the precursor of perovskite to improve the efficiency and stability of PSCs and provide in-situ protection of lead *** addition of EDTMPS acts as a crystal growth controller and passivation agent for perovskite films,thereby slowing down the crystallization rate of the film and obtaining high-quality perovskite *** study also provides an insight into how the modifier modulate the interfacial energy level arrangement as well as affect transfer of charge carriers and their recombination under photoinduced *** a result,the power conversion efficiency(PCE) of single subcell with a working area of 0.255 cm^(2) increases significantly from 20.03% to 23.37%.Moreover,we obtained a PCE of 19.16% for the 25 cm^(2) ***,the unencapsulated EDTMP-modified PSCs exhibit better operational and thermal stability,as well as in-situ absorption of leaked lead ions.

关键词： Perovskite solar cell Organic additive Defect passivation Crystallization process Lead leakage

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Unsymmetrical load effect of geologically inclined bedding strata on tunnels of passenger dedicated lines

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Journal of Modern Transportation 2012年第1期20卷 24-30页

作者： Benguo HE zhiqiang zhang Yu CHEN School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China

In order to study the unsymmetrical load effect in geological bedding strata for the Muzhailing tunnel on the Lanzhou-Chongqing passenger dedicated line in China, we investigated the deformation, mechanical response and pressure of the surrounding rock and the mechanical characteristics of bolts of the tunnel. The results suggest that open zones appear at arch and invert where joints open up, when layered stratum is horizontal, or when the dip angle of in- clined bedding is small. Open zones occur perpendicular to a joint. The failure mode is bending disjunction at the arch tain shear displacement, and lead to obvious geological bedding unsymmetrical load. The failure mode is shear damage. For the joint dip angle in the range of 75-90°, the failure mode is flexural crushing at the wall and vertical shear rup- ture above the arch. The restraining effect of two sides weakens for vertical dip. On the whole, shear failure instabilitytrend would occur and the tunnel collapses evenly. When the angle between the bolt and structure plane is greater than 23°, bolts can enhance the shearing stiffness of joint plane. Unfortunately, in the general purpose graph of tunnel for 250 km/h of passenger dedicated lines, the bolts have equal length and spacing. The rationale behind this is worthy offurther study. For inclined bedding, the surrounding rock pressure at the left wall is more than that at the right wall. In addition, lining is likely to be damaged at left shoulder and side wall. With the dip angle increasing, the unsymmetrical load gradually achieves symmetry. Asymmetry design for support is recommended to reduce the unsymmetrical load on lining disturbed by excavation.

关键词： geological bedding strata unsymmetrical load tunnel bolt support surrounding rock pressure stability

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How cat lands: insights into contribution of the forelimbs and hindlimbs to attenuating impact force

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Chinese Science Bulletin 2014年第26期59卷 3325-3332页

作者： zhiqiang zhang Hui Yu Jialing Yang Lili Wang Liming Yang Institute of Solid Mechanics Beijing University of Aeronautics and Astronautics Mechanics and Materials Science Research Center Faculty of Mechanical Engineering and Mechanics Ningbo University

To safely land after different drops, cats can perfectly use their limbs as dampers to dissipate impact forces. Yet, we know little about the contribution of the forelimbs and hindlimbs of cats to attenuating the impact forces during landing. In order to investigate this, we analyzed the landing impulses and energy absorption based on the ground reaction forces and high-speed video recordings of cats performing self-initiated jump downs at different heights. Our results show that the distribution of impact forces between forelimbs and hindlimbs exhibits a landing height-dependent manner. Furthermore, combining the experimental measurements and the inverted pendulum-spring model, we find that variation in landing angle is correlated with the distribution manner. This posturedependent actuation allows the animal to tune the distribution of energy absorption between forelimbs and hindlimbs. These findings highlight how cats perfectly jump down using their limbs, providing fundamental insights into the importance of control mechanisms that attenuate landing impulses safely and efficiently.

关键词：冲击力前肢上市公司后肢猫安全着陆土地能量吸收

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Nanogenerator-Based Self-Charging Energy Storage Devices

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Nano-Micro Letters 2019年第2期11卷 5-23页

作者： Kun Zhao Yuanhao Wang Lu Han Yongfei Wang Xudong Luo zhiqiang zhang Ya Yang CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083People’s Republic of China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals School of Materials Science and EngineeringLanzhou University of TechnologyLanzhou 730050People’s Republic of China Xinjiang Technical Institute of Physics and Chemistry Chinese Academy of Sciencesürümqi 830011XinjiangPeople’s Republic of China School of High Temperature Materials and Magnesite Resources Engineering University of Science and Technology Liaoning185 Qianshan Zhong RoadAnshan 114044People’s Republic of China School of Chemical Engineering University of Science and Technology Liaoning185 Qianshan Zhong RoadAnshan 114044People’s Republic of China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049People’s Republic of China

One significant challenge for electronic devices is that the energy storage devices are unable to provide su cient energy for continuous and long-time operation,leading to frequent recharging or inconvenient battery *** satisfy the needs of next-generation electronic devices for sustainable working,conspicuous progress has been achieved regarding the development for nanogenerator-based self-charging energy storage ***,the development of the self-charging energy storage devices is *** will be on preparation of nanomaterials for Li-ion batteries and supercapacitors,structural design of the nanogenerator-based self-charging energy storage devices,performance testing,and potential ***,the challenges and perspectives regarding self-charging energy storage devices are also discussed.

关键词： Nanomaterial Nanogenerator Energy storage device Self-charging

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Agent-based simulation platform for cloud manufacturing

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International Journal of Modeling, Simulation, and Scientific Computing 2017年第3期8卷 1-20页

作者： Chun Zhao Lin zhang Yongkui Liu zhiqiang zhang Gengjiao Yang Bo Hu Li School of Automation Science and Electrical Engineering Beihang University Xueyuan Street 37Haidian District 100083BeijingP.R.China Engineering Research Center of Complex Product Advanced Manufacturing Systems Ministry of Education 100191BeijingP.R.China

Cloud manufacturing is a new manufacturing paradigm which creates an open environment for transactions among the *** on transaction modes and regularities in a cloud manufacturing environment is important for promoting the applications of cloud *** this end,we design and implement a simulation platform according to the typical transaction processes of enterprises in the cloud manufacturing *** the simulation platform,enterprises are encapsulated into Service Agents,and thus the activities of service agents can be used to describe enterprise *** defining different rules,simulations for different business models can be *** descriptions of the platform architecture,functions,and key technologies are *** feasibility of the simulation platform is verified through a case study.

关键词： Cloud manufacturing simulation platform service agent transaction process

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Synthesis, Characterization and Application of Methyl 3,5-Disulfo-benzoate Dipotassium Dihydrate as Nucleating Agent for Poly（L-lactide）

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Chemical Research in Chinese Universities 2014年第2期30卷 333-338页

作者： SUN zhiqiang zhang Han PANG Xuan BIAN Xinchao CHEN Wenqi CHEN Xuesi Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of Sciences Changchun 130022 P.R.China

A newly synthesized aromatic sulfonate compound,complex 2 with formula of K2[H3COOC-C6H3（SO3）2]·2H2O（methyl 3,5-disulfo-benzoate dipotassium dihydrate） was synthesized and characterized by elemental analysis,infrared（IR） spectrometry,nuclear magnetic resonance（NMR） and crystal structure ***-crystal X-ray diffraction（XRD） revealed that complex 2 crystallized in the triclinic system with space group P（i）.Complex 2 was used as nucleating agent for poly（L-lactide）（PLLA）.The crystallization of PLLA with powder of complex 2 was investigated by means of differential scanning calorimetry（DSC） and polarized optical microscopy （POM）.The results prove that complex 2 was effective as nucleating agent for *** could accelerate crystallization by reducing the induction time and increasing the density of nuclei in the crystallization *** half-time of crystallization（t0.5） for pure PLLA was about 8 times longer than that of PLLA sample with 1.0％（mass fraction） of complex 2.

关键词： Nucleating agent Crystal structure Poly(L-lactide) Isothermal crystallization

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Alterations of Cerebral Functional Connectivity in Patients with Frontal Lobe Epilepsy:A Graph Theory Study

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Transactions of Nanjing University of Aeronautics and Astronautics 2019年第3期36卷 527-536页

作者： CAO Xinzhi QIAN Zhiyu XU Qiang zhang zhiqiang SHEN Junshu LU Guangming College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106P.R.China Department of Information Jiangsu Province Academy of Traditional Chinese MedicineJiangsu Province Hospital on Integration of Chinese and Western MedicineNanjing 210028P.R.China Department of Medical Imaging Jinling HospitalMedical School of Nanjing UniversityNanjing 210002P.R.China Department of Equipment Jiangsu Province Academy of Traditional Chinese MedicineJiangsu Province Hospital on Integration of Chinese and Western MedicineNanjing 210028P.R.China

The aim of the present study is to investigate the brain functional network changes of patients with frontal lobe epilepsy(FLE)by resting-state functional magnetic resonance imaging(rsfMRI)and graph theoretical *** is performed in 46 adult patients with FLE and 46 age matched healthy controls(HCs).A functional network is built from these subjects,and the topological properties of such network are analyzed quantitatively using graph theoretical *** to the results,both FLE patients and HCs exhibit prominent small world *** with HCs,FLE shows a decrease in local efficiency(Eloc),clustering coefficient,nodal efficiency as well as nodal ***,FLE(seven)has fewer hubs than HCs(ten).The functional abnormalities in the network organization suggest functional disturbances in patients with *** study helps to gain new insights into the functional disorder in patients with *** networks built here can also be a set of potential biomarkers for the diagnosis,monitoring and the treatment of FLE.

关键词： functional MRI graph theory frontal lobe epilepsy small world

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