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Effect of electrochemical hydrogen charging on the microstructure and mechanical behavior of a duplex structured Mg-8wt.%Li alloy

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Journal of Magnesium and Alloys 2025年第2期13卷 668-680页

作者： Shuo Wang Daokui Xu Baojie Wang Dongliang Wang Zhiqiang Zhang Li Liu Jie Chen Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Engineering Research Center of Advanced Materials Preparing Technology Ministry of EducationNortheastern UniversityShenyang110819China Binzhou Institute of Technology BinzhouShandong Province256606China Shandong Key Laboratory of Advanced Aluminium Materials and Technology BinzhouShandong Province256606China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang110159China Spallation Neutron Source Science Center Dongguan523803China

In this work,through performing microstructural characterization,tensile testing and failure analysis,the influence of electrochemical hydrogen charging on the microstructure and mechanical behavior of an as-cast Mg-8wt.%Li alloy was *** revealed that after being hydrogen charged at 50 mA/cm2 for respectively 3 h,6 h and 18 h in 0.1 M NaCl solution,obvious HID occurred and the damage degree was gradually increased with the hydrogen charging *** the sample being hydrogen charged for 3 h,micro pores with the diameter ranging from 10~30µm were formed and preferentially present inα-Mg ***,micro cracks with the length ranging from 10~50µm mainly initiated inα-Mg phase,atα-Mg/β-Li interfaces and the peripheries of *** the increase of hydrogen charging time,the numbers of pores and cracks were obviously *** results revealed that the hydrogen charging can simultaneously decrease the tensile strength and ductility of the *** with the uncharged sample,the tensile yield strength,ultimate tensile strength and the elongation ratio to failure were respectively reduced by 5.7%,7.3%,31.7%for the 3h-charged sample and 24.6%,24.8%,67.0%for the 18h-charged *** analysis indicated that hydrogen charging can induce the brittle cracking of the alloy and the size of brittle cracking region being composed of quasi-cleavage facets and interfacial cracks on the fracture surfaces was increased with the hydrogen charging time.

关键词： Magnesium-lithium alloy Microstructure Hydrogen-induced damage Hydrogen embrittlement Mechanical behavior

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The Power Supply System for the J-TEXT Poloidal Field

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Plasma Science and technology 2009年第1期11卷 100-103页

作者：张明庄革于克训邱胜顺潘垣 Key Lab of Fusion and Advanced Electromagnetic Technology of Ministry of Education College of Electrical and Electronic EngineeringHuazhong University of Science and Technology

Joint-TEXT （J-TEXT） is a medium-sized tokamak constructed at Huazhong University of Science and technology. At present, the poloidal field power supply consists of three subsystem sets, namely Ohmic heating field power supply, vertical field power supply, and horizontal field power supply. The structure and function of the poloidal field （PF） power supply as well as the updated control system of the power supply is described. The new scheme uses the realtime feedback control method for the poloidal field power supply. The experimental results show that the poloidal field energized by poloidal field power supply meets the J-TEXT operational requirement perfectly.

关键词： J-TEXT poloidal field power supply control

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A numerical simulation of surface wave excitation in a rectangular planar-type plasma source

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Chinese Physics B 2009年第8期18卷 3484-3489页

作者：陈兆权刘明海蓝朝晖陈伟唐亮罗志清燕保荣吕建红胡希伟 Key Laboratory of Fusion and Advanced Electromagnetic Technology of Ministry of Education College of Electrical & Electronic EngineeringHuazhong University of Science and Technology

The principle of surface wave plasma discharge in a rectangular cavity is introduced simply based on surface plasmon polariton theory. The distribution of surface-wave electric field at the interface of the plasma-dielectric slab is investigated by using the three-dimensional finite-difference time-domain method （3D-FDTD） with different slotantenna structures. And the experimental image of discharge with a novel slot antenna array and the simulation of the electric field with this slot antenna array are both displayed. Combined with the distribution of surface wave excitation and experimental results, the numerical simulation performed by using 3D-FDTD is shown to be a useful tool in the computer-aided antenna design for large area planar-type surface-wave plasma sources.

关键词： surface wave plasma numerical simulation three-dimensional finite-difference time domain method surface plasmons polaritons

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Intermittency of the density fluctuations and its influence on the radial transport in the boundary of J-TEXT

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Chinese Physics B 2011年第2期20卷 353-359页

作者：朱孟周庄革王之江潘垣 College of Electrical and Electronic Engineering Huazhong University of Science and Technology Key Laboratory of Fusion and Advanced Electromagnetic Technology of Ministry of Education

To improve the understanding of the turbulence intermittency, a detailed investigation of the intermittency of the density fluctuations has been performed in the boundary of J-TEXT. The intermittency of the density fluctuations and its influence on the radial transport are reported. The probability distribution functions of the density fluctuations are not scale-invariant, being inconsistent with the self-organized criticality hypothesis. The underlying dynamics of the intermittency are detected using the quiet-time statistical method. The probability distribution function of the quiet times shows double-power-law regions, indicating the existence of correlations between the successive burst events.

关键词： intermittency radial transport J-TEXT

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A Novel Structure of Slot-Antenna Array for Producing Large-Area Planar Surface-Wave Plasmas

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Plasma Science and technology 2008年第6期10卷 655-660页

作者：陈兆权刘明海周培勤陈伟蓝朝晖胡希伟 Key Lab of Fusion and Advanced Electromagnetic Technology of Ministry of Education College of Electrical & Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The principle of surface wave plasma discharge in a rectangular cavity is introduced and the distribution of the electromagnetic field within a rectangular waveguide is analysed. A novel structure of a slot antenna array is presented. In comparison with the traditional slotantenna, it is shown that the designed slot antenna array can excite effectively the surface wave coupling into the chamber, and generate a stable large-area high-density plasma. These results are useful for exploring the optimized design of the slot-antenna for surface wave plasmas.

关键词： surface-wave plasmas slot-antenna microwave

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A Visible Light Imaging System for the Estimation of Plasma Vertical Displacement in J-TEXT

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Plasma Science and technology 2010年第6期12卷 641-645页

作者：朱孟周庄革王之江丁永华高丽胡希伟潘垣 College of Electrical and Electronic Engineering Huazhong University of Science and Technology China Key Laboratory of Fusion and Advanced Electromagnetic Technology of Ministry of Education

A wide-viewing-angle visible light imaging system （VLIS） was mounted on the Joint Texas Experimental Tokamak （J-TEXT） to monitor the discharge process. It is proposed that by using the film data recorded the plasma vertical displacement can be estimated. In this paper installation and operation of the VLIS are presented in detailed. The estimated result is further compared with that measured by using an array of magnetic pickup coils. Their consistency verifies that the estimation of the plasma vertical displacement in J-TEXT by using the imaging data is promising.

关键词： visible light imaging, vertical displacement J-TEXT

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Estimation of Plasma Density by Surface Plasmons for Surface-Wave Plasmas

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Chinese Physics Letters 2008年第12期25卷 4333-4335页

作者：陈兆权刘明海蓝朝晖陈伟罗志清胡希伟 Key Laboratory of Fusion and Advanced Electromagnetic Technology of Ministry of Education College of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074

An estimation method of plasma density based on surface plasmons theory for surface-wave plasmas is proposed. The number of standing-wave is obtained directly from the discharge image, and the propagation constant is calculated with the trim size of the apparatus in this method, then plasma density can be determined with the value of 9.1 × 10^17m^-3. Plasma density is measured using a Langmuir probe, the value is 8.1 × 10^17m^-3 which is very close to the predicted value of surface plasmons theory. Numerical simulation is used to check the number of standing-wave by the finite-difference time-domain （FDTD） method also. All results are compatible both of theoretical analysis and experimental measurement.

关键词： field emission molybdenum dioxide enhancement factor

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Compressibility Effects on the Rayleigh-Taylor Instability Growth Rates

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Chinese Physics Letters 2008年第3期25卷 1015-1018页

作者：何勇胡希伟江中和 Key Laboratory of Fusion and Advanced Electromagnetic Technology of Ministry of Education Huazhong University of Science and Technology Wuhan 430074 Department of Physics Huazhong University of Science and Technology Wuhan 430074

Effects of two compressibility parameters, i.e. the ratio of specific heats and the equilibrium pressure at the interface, on the Rayleigh-Taylor instability （RTI） growth rates are studied under the same initial conditions, which include the mass, pressure profile, and density profile of the two superposed fluids. The results obtained reconcile the stabilizing and destabilizing effects of compressibility reported in the literature. The influences of the ratio of specific heats on the RTI growth rates are not only stabilized but also destabilized. The effects of the equilibrium pressure at the interface on the growth rates are destabilized.

关键词： compressibility interface phenomena Rayleigh-Taylor instability specific heat

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Two distinct roles of Al2Sm and Al11Sm3 phases on the corrosion behavior of the magnesium alloy Mg-5Sm-xAl

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Progress in Natural Science:Materials International 2021年第4期31卷 599-608页

作者： Xingrui Chen Qi Zou Qichi Le Shaochen Ning Chenglu Hu Xiaoqiang Li Anrej Atrens Key Lab of Electromagnetic Processing of Materials Ministry of Education Northeastern University School of Mechanical and Mining Engineering The University of Queensland Engineering Research Center of Advanced Materials Preparing Technology Ministry of Education

The roles of Al11Sm3and Al2Sm phases on microstructure evolution, mechanical properties and corrosion behavior of the Mg-5Sm-x Al system was investigated. The results showed that adding Al to Mg–5Sm binary alloy brought two Al–Sm phases, Al11Sm3and Al2Sm, which had two distinct roles regarding the microstructure evolution, mechanical properties and corrosion behavior of the Mg-Sm-Al alloy. Al11Sm3produced a strong galvanic couple with the Mg matrix, and significantly accelerated the corrosion. The Al2Sm particles promoted heterogeneous nucleation and refined the grains, which increased the tensile strength and ductility. Both types of Al–Sm particles provided strengthening effect for the alloy. With higher Al contents, Al2Sm formed an Al oxide protective surface layer and increased corrosion resistance.

关键词： Magnesium alloy Rare earth elements Intermetallics Mechanical properties Corrosion

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High-power microwave discharge for producing large-area surface-wave plasmas

High-power microwave discharge for producing large-area surf...

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8th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2008

作者： Zhaoquan, Chen Minghai, Liu Wei, Chen Zhiqing, Luo Liang, Tang Chaohui, Lan Xiwei, Hu Key Laboratory of Fusion and Advanced Electromagnetic Technology Ministry of Education Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781424421923

The theory of surface-wave discharge is introduced. A novel structure of the slot antenna array is designed in this paper, and its excitation is numerical analyzed using dipole-antenna array model and FDTD method, respectively. A microwave discharge experiment is operated with this slot-antenna array, and a numerical simulation is also done with FDTD code using the parameter of plasma from experimental measurement. It is found that the designed slot antenna array can excite effectively the microwave coupling into the cavity, and produce the stable large-area high-density plasma. © 2008 IEEE.

关键词： Electric discharges

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