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Enhanced pitting corrosion resistance of a Zr-based metallic glass by ultraviolet light irradiation

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Journal of Iron and Steel Research(International) 2023年第8期30卷 1642-1649页

作者： Z.Chen D.P.wang S.wang y.x.Geng y.x.Guo y.C.Wu Z.G.Liu y.y.Zhang y.x.wang School of Materials Science and Engineering Jiangsu University of Science and Technology.Zhenjiang 212003JiangsuChina School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina

The influence of ultraviolet light irradiation on the pitting corrosion performance of a Zr_(2)Ni metallic glass was examined using electrochemical methods and immersion test in 0.05 mol/L NaCl *** the results of potentiostatic polarization,the pitting potential of the ultraviolet light-irradiated sample shifted positively with a value of~300 mV,revealing the enhanced pitting corrosion resistance of the *** corrosion morphology after the immersion test also demonstrated lower degree of corrosion damage and improved pitting resistance of the sample with ultraviolet light irradiation.x-ray photoelectron spectroscopy analysis revealed more zirconium enrichment in the passive film and no chloride ions adsorption for the samples with ultraviolet irradiation,accounting for the suppression of the pit generation and *** findings indicate that ultraviolet light irradiation improves the pitting corrosion resistance of the Zr-based metallic glasses,which are promising structural materials to be used in corrosion environments with high ultraviolet irradiation.

关键词： Metallic glass Pitting-Corrosion Ultraviolet light irradiation Passive film

Depolarization of intense laser beams by dynamic plasma density gratings

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高功率激光科学与工程:英文版 2023年第3期11卷 48-56页

作者： y.x.wang S.M.Weng P.Li Z.C.Shen x.y.Jiang J.Huang x.L.Zhu H.H.Ma x.B.Zhang x.F.Li Z.M.Sheng J.Zhang Key Laboratory for Laser Plasmas(MoE) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghaiChina Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghaiChina Research Center of Laser Fusion of China Academy of Engineering Physics MianyangChina College of Physics and Electronics Engineering Northwest Normal UniversityLanzhouChina Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghaiChina

As a typical plasma-based optical element that can sustain ultra-high light intensity,plasma density gratings driven by intense laser pulses have been extensively studied for wide ***,we show that the plasma density grating driven by two intersecting driver laser pulses is not only nonuniform in space but also varies over ***,the probe laser pulse that passes through such a dynamic plasma density grating will be depolarized,that is,its polarization becomes spatially and temporally *** importantly,the laser depolarization may spontaneously take place for crossed laser beams if their polarization angles are arranged *** laser depolarization by a dynamic plasma density grating may find application in mitigating parametric instabilities in laser-driven inertial confinement fusion.

关键词： depolarization high-power laser plasma density grating

Thermal stability and deformation mechanisms in Ni-Co-Fe-Cr-Al-Ti-Nb-type nanoparticle-strengthened high-entropy alloys

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Journal of Materials Science & Technology 2023年第36期167卷 171-183页

作者： J.x.Hou J.y.Zhang J.x.Zhang J.H.Luan y.x.wang B.x.Cao y.L.Zhao Z.B.Jiao x.J.Liu W.W.Song P.K.Liaw T.yang Department of Materials Science and Engineering Hong Kong Institute for Advanced StudyCity University of Hong KongHong KongChina School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina Steel Institute RWTH Aachen UniversityAachen 52072Germany Institute of Materials Engineering University of KasselKassel 334125Germany Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996-2200USA City University of Hong Kong China

The precipitate morphologies,coarsening kinetics,elemental partitioning behaviors,grain structures,and tensile properties were explored in detail for L1_(2)-strengthened Ni_(39.9)Co_(20)Fe_(15)Cr_(15)Al_(6)Ti_(4-x)Nb_(x)B_(0.1)(x=0 at.%,2 at.%,and 4 at.%)high-entropy alloys(HEAs).By substituting Ti with Nb,the spheroidal-to-cuboidal precipitate morphological transition,increase in the coarsening kinetics,and phase decomposition upon aging at 800°C *** excessive addition of Nb brings about the grain boundary precipitation of an Nb-rich phase along with the phase decomposition from the L1_(2)to lamellar-structured D019 phase upon the long-term aging *** partially substituting Ti with Nb,the chemically complex and thermally stable L12 phase with a composition of(Ni_(58.8)Co_(9.8)Fe_(2.7))(Al_(12.7)Ti_(5.8)Nb_(7.5)Cr_(2.3))ensures the stable phase structure and clean grain boundaries,which guarantees the superb high-temperature mechanical properties(791±7 MPa for yielding and 1013±11 MPa for failure)at 700℃.Stacking faults(SFs)were observed to prevail during the plastic deformation,offering a high work-hardening capability at 700°*** anomalous rise in the yield strength at 800℃was found,which could be ascribed to the multi-layered super-partial dislocations with a cross-slip configuration within the L1_(2)particles.

关键词： High-entropy alloys Coarsening kinetics Coherent precipitation strengthening Mechanical properties

Stresses State and Mechanical Behaviors of the Green Body During Die Compaction and Ejection Process

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Acta Metallurgica Sinica(English Letters) 2020年第4期33卷 605-614页

作者： S.M.wang y.wang y.x.wang F.P.Liu J.Cao Department of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 15001China

Finite element simulations for metal powder compaction of a clutch plate were performed to examine the stresses during compaction,unloading,and *** describe the mechanical behavior of compacted green body,a modified densitydependent Drucker-Prager Cap model was utilized to predict the stress and density distribution of the compacted clutch plate during loading and ejection *** results indicate that maximum tensile principal stress was a main driving force for the tensile crack initiation during ejection stage,and shear stress may be another driving force in both compaction and ejection stages for shear crack *** were peak value of the stresses during ejection stage,and the stresses are in compressive state only during compaction ***,the tensile crack initiation is not possible during compaction except shear *** stress in the clutch plate is of less contribution to the crack initiation during compaction,unloading and *** of criteria of the crack initiation and fracture is necessary in order to obtain uniform density and crackfree components in the manufacturing of metal powder compaction.

关键词： Powder compaction Finite element simulation Stress history Cap model Green body

鉴别膝状神经节静脉畸形和施万细胞瘤：动态增强T1WI的独特诊断价值

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国际医学放射学杂志 2024年第1期 126-126页

作者： J.Mengda y.C.Chai L.xue y.x.wang W.W.xia y.Song 武鑫宏

摘要目的通过高分辨CT(HRCT)、常规MRI和动态增强T1WI的特征鉴别膝状神经节静脉畸形（GGVM）和神经鞘瘤（GGS）。方法回顾性纳入2016年—2021年间经手术确认

关键词：

双能CT预测甲状腺乳头状癌颈淋巴结隐匿性转移的临床价值

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国际医学放射学杂志 2024年第2期 247-247页

作者： W.Zhao S.S.Shen T.F.Ke J.Jiang y.x.wang x.J.xie 王俊

摘要目的通过分析乳头状甲状腺癌（PTC）的双能CT(DECT)参数，预测颈部淋巴结隐匿性转移（OLNM）的概率。方法回顾性收集经病理证实并行中央区淋巴结清扫

关键词：

HExAHEDRAL ELEMENT REFINEMENT FOR THE PREDICTION- CORRECTION ALE FEM SIMULATION OF 3D BULKINGFORMING PROCESS

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Acta Metallurgica Sinica(English Letters) 2004年第6期17卷 923-927页

作者： J.Chen y.x.wang W.P.Dong x.y.Ruan DepartmentofPlasticityEngineering ShanghaiJiaotongUniversityShanghai200030China

Based on the characteristics of 3D bulk forming process, the arbitrary Lagrangian-Eulerian (ALE) formulation-based FEM is studied, and a prediction-correction ALE-based FEM is proposed which integrates the advantages of precisely predicting the boundary configuration of the deformed material, and of efficiently avoiding hexahedron remeshing processes. The key idea of the prediction-correction ALE FEM is elaborated in detail. Accordingly, the strategy of mesh quality control, one of the key enabling techniques for the 3D bulk forming process numerical simulation by the prediction-correction ALE FEM is carefully investigated, and the algorithm for hexahedral element refinement is formulated based on the mesh distortion energy.

关键词： prediction-correction ALE FEM 3D bulk forming numerical simulation hexahedron mesh refinement

Relationship of Corrosion Behavior Between Single-Phase Equiatomic CoCrNi,CoCrNiFe,CoCrNiFeMn Alloys and Their Constituents in NaCl Solution

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Acta Metallurgica Sinica(English Letters) 2021年第11期34卷 1574-1584页

作者： D.P.wang J.W.Shen Z.Chen F.G.Chen P.y.Guo y.x.Geng y.x.wang School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

The composition is a significant issue for corrosion resistance of metallic *** reveal the correlation of corrosion behavior between multiprinciple alloys and their constituents,a series of single-phase equiatomic alloys of CoCrNi,CoCrNiFe and CoCrNiFeMn was *** electrochemical and scanning electron microscope results demonstrated that corrosion resistance of the equiatomic alloys in 0.1 M NaCl solution is located in the range but not the average value of their constituents.x-ray photoelectron spectroscopy analysis indicated that the protective performance of passive film is mainly determined by the constituent with the highest corrosion resistance and the breakdown of passive film is mainly dominated by the elements with the highest corrosion *** findings can guide the materials design of multiprinciple alloys with expected corrosion performance.

关键词： High-entropy alloy Corrosion Constituent x-ray photoelectron spectroscopy(xPS) Passive films

Effect of carbon on hydrogen behavior in tungsten

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Effect of carbon on hydrogen behavior in tungsten