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STUDY ON THE CORROSION AND MECHANICAL PROPERTIES OF FJ316 STAINLESS STEEL-GLASS COMPOSITE

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Acta Metallurgica Sinica(English Letters) 1998年第3期11卷 175-182页

作者： S.Abubakir Y.S.Wu T.C.zhang z.Yang z.zhang Univ of Science and Technology Beijing Beijing China

Samples of FJ316 stainless steel powder alloyed with different amounts of glass2 material have been compacted at the pressure of 686MPa and sintered at 1160, 1180,and 1200℃, in hydrogen atmosphere for one hour. The materials have been subjected to microstructure characterization, tensile strength, handness, impact toughness and corrosion testing. The effect of the experimental process parameter has been evaluated and the importance of porosity, sintered temperature, glass content and its grain size in determining mechanical and corrosion properties has been confirmed. Glass has a strong effect on the mechanical properties and produces brittleness when added to FJ316SS. Very good corrosion resistance has been achieved by comparing this result with the corosion resistance of sintered pure stainless steel. The results of this study permit optimization in the production of glass alloyed P/M FJ316SS, with respect to mechanical properties and high corrosion resistance.

关键词： corrosion rate FJ316SS glass2 composite material mechanical property

COMPARISON OF MATERIAL FOR ENCAPSULATING MINIMODULES

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 380-384页

作者： z.zhang H.Shen X.Q.Xu W.Chen GuangzhouInstituteofEnergyConversion TheChineseAcademyofSciencesGuangzhou510070China GuangzhouInstituteofEnergyConversion TheChineseAcademyofSciencesGuangzhou510070China／／TheSchoolofPhysicsandEngineeringZhongshanUniversityGuangzhou510640China

The main characteristics of glass, polymethyl methacrylate (PMMA) and polycarbon ate (PC) were presented. The transmittance of glass, PMMA and PC was measured by the UV-VIS spectroscopy analysis. PMMA and PC have the advantages of higher tra nsparency, higher resistance and lower density. It is indicated that both PMMA a nd PC are suitable for encapsulating solar minimodules.

关键词： solar module PMMA PC encapsulate

Effect of post weld artificial aging and water cooling on microstructure and mechanical properties of friction stir welded 2198-T8 Al-Li joints

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Journal of Materials Science & Technology 2022年第28期123卷 92-112页

作者： Y.Tao z.zhang P.Xue D.R.Ni B.L.Xiao z.Y.Ma Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

Friction stir welding(FSW)under both air cooling and water cooling conditions with welding parameters of 800-1200 rpm rotation rates and 50-200 mm/min welding speeds was carried out on 2198-T8 Al-Li alloys,and post weld artificial aging was performed on the air cooled *** welding defects other than lazy S were observed in the nugget zone(Nz)for all *** air cooling condition,the lowest hardness zone(LHz)occurred in the heat affected zone(HAz).FSW resulted in gradual dissolution of original T_(1),θ′andδ′/β′from the base material(BM)to the thermo-mechanically affected zone(TMAz),and complete dissolution of all precipitates in the Nz withδ′/β′and Guinier-Preston zones precipitating during *** air cooled joints exhibited no noticeable changes in intrinsic tensile strength with a joint strength reaching 81.3%of the BM,but varied elongation with welding parameters,which was closely related to failure in the Nz and fracture along lazy *** weld artificial aging led to the largest hardness recovery in the TMAz but smaller hardness recovery in the initial LHz and the *** aging kinetics across the joint was determined by volume fraction of both original precipitate dissolu-tion during welding and coarse particles formed during aging,and by dislocation density inherited from *** weld artificial aging greatly enhanced the joint strength with the ultimate tensile strength reaching 87.3%of the *** compared to air cooling condition,water cooling hardly affected the Nz hardness and did not improve the joint strength,and the reason was discussed in light of precipitates,hardness changes and fracture behavior.

关键词： Friction stir welding Aluminum-lithium alloys Microstructure Mechanical properties

Anisotropic Inter-granular Corrosion Behaviors and Microstructures of AlMgSiCu Alloy Sheets Made by Thermal–Mechanical Treatments

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Acta Metallurgica Sinica(English Letters) 2022年第2期35卷 275-284页

作者： L.M.Liu Y.X.Lai C.L.Wu z.zhang J.H.Chen Center for High-Resolution Electron Microscopy College of Materials Science and EngineeringHunan UniversityChangsha 410082China

This study investigates the microstructure and local corrosion behavior of an Al-Mg-Si-Cu alloy,which has been subjected to cold-rolling with different deformation strain ratios(DSRs)and followed by artificial *** corrosion tests show that peak-aged samples with a small DSR(5-10%)are sensitive to inter-granular corrosion(IGC)along both the normal and rolling *** the DSR increases to medium strength(20-40%),IGC sensitivity decreases along both directions and corrosion propagates *** the DSR is 60-80%,IGC sensitivity along the normal direction continues to decrease,but increases along the rolling direction,indicating pronounced corrosion *** characterization reveals the decreased IGC sensitivity is mainly attributed to a reduction in element segregation at high-angle grain boundaries and the kinked and discontinuous grain boundary corrosion *** increased IGC sensitivity along the rolling direction could be related to the significantly flattened grains.

关键词： Al alloys Local corrosion Anisotropy Transmission electron microscopy(TEM) Electron backscattering diffraction(EBSD)

All-optical forward-viewing photoacoustic probe for high-resolution 3D endoscopy

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Light(Science & Applications) 2018年第1期7卷 337-345页

作者： Rehman Ansari Edward z.zhang Adrien E.Desjardins Paul C.Beard Department Medical Physics and Biomedical Engineering University College LondonGower StreetLondon WC1E 6BTUK Wellcome/EPSRC Centre for Interventional and Surgical Sciences University College LondonCharles Bell House67-73 Riding House StreetLondon W1W 7EJUK

A miniature forward-viewing endoscopic probe that provides high-resolution 3D photoacoustic images is *** probe is of outer diameter 3.2mm and comprised of a transparent Fabry-Pérot(FP)polymer-film ultrasound sensor that is located at the distal end of a rigid optical fiber *** laser pulses are coupled simultaneously into all cores of the bundle and are transmitted through the FP sensor to provide wide-field tissue illumination at the distal *** resulting photoacoustic waves are mapped in 2D by sequentially scanning the input end of the bundle with an interrogation laser beam in order to individually address different points on the FP *** this way,the sensor acts as a high-density ultrasound array that is comprised of 50,000 individual elements,each of which is 12μm in diameter,within the 3.2mm diameter footprint of the *** fine spatial sampling that this affords,along with the wide bandwidth(f_(-3dB)=34 MHz)of the sensor,enables a high-resolution photoacoustic image to be *** measured on-axis lateral resolution of the probe was depth-dependent and ranged from 45-170μm for depths between 1 and 7 mm,and the vertical resolution was 31μm over the same depth *** system was evaluated by acquiring 3D images of absorbing phantoms and the microvascular anatomies of a duck embryo and mouse *** image fidelity was *** is anticipated that this type of probe could find application as a tool for guiding laparoscopic procedures,fetal surgery and other minimally invasive interventions that require a millimeter-scale forward-viewing 3D photoacoustic imaging probe.

关键词： optical millimeter resolution

A microfluidic biosensor for the diagnosis ofchronic wasting disease

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Microsystems & Nanoengineering 2023年第4期9卷 263-279页

作者： Sura A.Muhsin Amjed Abdullah Estela kobashigawa Muthana Al-Amidie Sherri Russell Michael z.zhang Shuping zhang Mahmoud Almasri University of Missouri–Columbia Electrical Engineering and Computer ScienceColumbiaMOUSA University of Missouri–Columbia College of Veterinary MedicineVeterinary Medical Diagnostic LaboratoryColumbiaMOUSA Missouri Department of Conservation ColumbiaMOUSA

Cervids are affected by a neurologic disease that is always fatal to individuals and has population effects. This disease iscalled chronic wasting disease (CWD) and is caused by a misfolded prion protein. The disease is transmitted viacontact with contaminated body fluids and tissue or exposure to the environment, such as drinking water or *** CWD diagnosis depends on ELISA screening of cervid lymph nodes and subsequent immunohistochemistry(IHC) confirmation of ELISA-positive results. The disease has proven to be difficult to control in part because ofsensitivity and specificity issues with the current test regimen. We have investigated an accurate, rapid, and low-costmicrofluidic microelectromechanical system (MEMS) biosensing device for the detection of CWD pathologic prions inretropharyngeal lymph nodes (RLNs), which is the current standard type of CWD diagnostic sample. The deviceconsists of three novel regions for concentrating, trapping, and detecting the prion. The detection region includes anarray of electrodes coated with a monoclonal antibody against pathologic prions. The experimental conditions wereoptimized using an engineered prion control antigen. Testing could be completed in less than 1 hour with highsensitivity and selectivity. The biosensor detected the engineered prion antigen at a 1:24 dilution, while ELISA detectedthe same antigen at a 1:8 dilution. The relative limit of detection (rLOD) of the biosensor was a 1:1000 dilution of aknown strong positive RLN sample, whereas ELISA showed a rLOD of 1:100 dilution. Thus, the biosensor was 10 timesmore sensitive than ELISA, which is the currently approved CWD diagnostic test. The biosensor’s specificity andselectivity were confirmed using known negative RPLN samples, a negative control antibody (monoclonal antibodyagainst bovine coronavirus BCV), and two negative control antigens (bluetongue virus and Epizootic hemorrhagicdisease virus). The biosensor’s ability to detect pathogenic prions was

关键词： fir diagnosis specificity

ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY DURING CORROSION PROCESS OF 8090 Al-Li ALLOY IN EXCO SOLUTION

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Acta Metallurgica Sinica(English Letters) 2004年第6期17卷 894-901页

作者： J.F.Li z.Q.zheng C.Y.Tan S.C.Li z.zhang J.Q.zhang CollegeofMaterialsScienceandEngineering CentralSouthUniversityChangsha410083China／／DepartmentofChemistryZhejiangUniversityHangzhou310027China CollegeofMaterialsScienceandEngineering CentralSouthUniversityChangsha410083China DepartmentofChemistry ZhejiangUniversityHangzhou310027China DepartmentofChemistry ZhejiangUniversityHangzhou310027China／／StateKeyLaboratoryforCorrosionand.ProtectionInstituteofMetalResearchTheChineseAcademy

The corrosion behavior and electrochemical impedance spectroscopy (EIS) features of 8090 Al-Li alloys in EXCO solution were investigated, and the EIS was simulated using an equivalent circuit. At the beginning of immersion in EXCO solution, the EIS is comprised by a depressed capacitive arc at high-mediate frequency and an inductive arc at low frequency, and the inductive component decreases and disappears with im- mersion time. Once exfoliation or severe pitting corrosion is produced, two capacitive arcs appear in the EIS. These two capacitive arcs are originated from the two parts of the corroded alloy surface, the original flat alloy surface and the new inter-face exposed to the aggressive EXCO solution due to the exfoliation or pitting corrosion. Some corrosion development features of 8090 Al-Li alloys in EXCO solution can be obtained through simulated EIS information.

关键词： Al-Li alloy, exfoliation, electrochemical impedance spectros- copy (EIS), EXCO solution

ELECTROCHEMICAL NOISE ANALYSIS OF THE INFLUENCE OF THE zn^(2+)IONS CONCENTRATION ON zINC ELECTROPLATING

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Acta Metallurgica Sinica(English Letters) 2005年第2期18卷 137-144页

作者： z.zhang C.S.Wu Q.Y.Cai F.H.Cao J.Q.zhang DepartmentofChemistry ZhejiangUniversityHangzhou310027China DepartmentofChemistry ZhejiangUniversityHangzhou310027China／／StateKeyLaboratoryforCorrosionandProtectionInstituteofMetalResearchTheChineseAcademyofSciencesShenyang110016China

The influence of the concentration of zn2+ ions on zinc electroplating process was investigated by means of electrochemical noise (EN) and cyclic voltammetry methods in conjunction with the scanning electron microscopy (SEM) technique. It was found that the EN generated during the electroplating of dentritic or large polymeric zinc deposit has large potential oscillation amplitude and positive potential drift while the compact zinc deposit possesses small noise amplitude and little potential drift. With the change of rate determining step from diffusion-control through mixed-control to activation-control, the maximum relative energy obtained from wavelet analysis defined from the region with larger scales to those with smaller scales, and the EDP (relative energy distribution plot) can be us, as 'fingerprints' of EN to characterize the electroplating process and the deposit structure. The results also showed that electrochemical noise technique can give more information about the electrodeposit structure than other normal electrochemical measurements, such as linear potential sweep method and cyclic voltammetry technique.

关键词： zinc electroplating zinc ions concentration electrochemical noise electrodeposit structure

Mechanical properties of Al/a-C nanocomposite thin films synthesized using a plasma focus device

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Chinese Physics B 2014年第2期23卷 353-358页

作者： z.A.Umar R.S.Rawat R.Ahmad A.K.Kumar Y.Wang T.Hussain z.Chen L.Shen z.zhang NSSE National Institute of EducationNanyang Technological University Department of Physics GC University Center for Advanced Studies in Physics (CASP) GC University School of Materials Science and Engineering Nanyang Technological University Institute of Materials Research and Engineering ASTAR (Agency for ScienceTechnology and Research)3 Research Link

The Al/a-C nanocomposite thin films are synthesized on Si substrates using a dense plasma focus device with alu- minum fitted anode and operating with CH4/Ar admixture. X-ray diffractometer results confirm the formation of metallic crystalline Al phases using different numbers of focus shots. Raman analyses show the formation of D and G peaks for all thin film samples, confirming the presence of a-C in the nanocomposite thin films. The formation of Al/a-C nanocomposite thin films is further confirmed using X-ray photoelectron spectroscopy analysis. The scanning electron microscope results show that the deposited thin films consist of nanoparticles and their agglomerates. The sizes of th agglomerates increase with increasing numbers of focus deposition shots. The nanoindentation results show the variations in hardness and elastic modulus values of nanocomposite thin film with increasing the number of focus shots. Maximum values of hardness and elastic modulus of the composite thin film prepared using 20 focus shots are found to be about 10.7 GPa and 189.2 GPa, respectively.

关键词： dense plasma focus X-ray photoelectron spectroscopy field emission scanning electron micro- scope elastic modulus