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Acta Metallurgica Sinica(English Letters) 2016年第9期29卷 834-839页

作者： Md Anisur Rahman Yun-Zhuo Lu Qiang Luo Shou-Jiang Qu Feng-Xia Ye Yi-Xuan Wu Jun Shen School of materials science and engineering Tongji University School of materials science and engineering Dalian Jiaotong University

Fe43MsCra5Mo14C15B6Y2 （M = Mn, Co, Ni, and Cu in at.%） bulk metallic glasses （BMGs） are synthesized using the suction casting technique, and the glass-forming ability （GFA）, microstructure, and thermal and magnetic properties of these glasses are extensively examined using X-ray diffraction, differential scanning calorimeter, and vibrating sample magnetometer techniques. Among the four BMG alloys, Fe43NisCr15Mo14C15B6Y2 exhibits the lowest coercivity and the highest saturation magnetization, Curie temperature, effective magnetic moment, and GFA. By contrast, Fe43MnsCrlsMo14C15B6Y2 presents the poorest magnetic properties, such as the highest coercivity and the lowest saturation magnetization, Curie temperature, and effective magnetic moment. Fe43Cu5Cr15MolaC15B6Y2 demonstrates the lowest thermal stability and GFA. The observed thermal, structural, and magnetic properties of these BMG alloys are discussed in terms of the kinetics of BMG synthesization and the formation of different ferromagnetic, ferrimagnetic, and antiferromagnetic phases.

关键词： Bulk metallic glasses Saturation magnetization Effective magnetic moment Coercivity Glass-forming ability

Remote-controlled dexamethasone-duration on eye-surface with a micelle-magnetic nanoparticulate co-delivery system for dry eye disease

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Acta Pharmaceutica Sinica B 2024年第8期14卷 3730-3745页

作者： Qinxiang Zheng Chaoxiang Ge Kexin Li Longxin Wang Xiaoyu Xia Xiao Liu Rashid Mehmood Jianliang Shen Kaihui Nan Wei Chen Sen Lin National engineering Research Center of Ophthalmology and Optometry Eye HospitalWenzhou Medical UniversityWenzhou 325027China National Clinical Research Center for Ocular Diseases Eye HospitalWenzhou Medical UniversityWenzhou 325027China Zhejiang engineering Research Center for Tissue Repair materials Wenzhou InstituteUniversity of Chinese Academy of SciencesWenzhou 325000China School of Chemical engineering UNSW SydneyHigh StreetBuilding E10KensingtonNSW 2052Australia Adult Cancer Program Lowy Cancer Research CentreUNSW SydneyCorner Botany&High StreetsKensingtonNSW 2052Australia

Dexamethasone(DEX)is used to treat ocular surface ***,regulating DEX duration in tears while preventing its absorption into the anterior chamber is critical for balancing its therapy effects and the side *** this study,a novel magnetic nanoparticle(MNP)-micelle(MC)codelivery system(MMDS)was *** MC moiety in the MMDS served as the carrier for DEX and the MNP part endowed the MMDS with magnetic-responsive *** extend its residency,the MMDS was magnetically attracted by an external magnet after instilling,which acted as a precorneal drug-depot enabling a sustainable release of DEX in *** combination of magnet treatment,the topical instillation of MMDS@DEX significantly prolonged the DEX-retention in tears and increased the DEX-concentration in the cornea and conjunctiva,as well as concurrently reduced the DEX-level in the aqueous humor,when compared with the commercial DEX eye drop *** combination of MMDS@DEX and magnet treatment exerted significantly better therapeutic effects against DED with smaller side effects than conventional treatments including DEX suspension,commercial DEX eye drops,as well as the MMDS@DEX treatment *** present work provided a new method for the effective delivery of DEX to ocular surface tissues while reducing its side effects,which will be beneficial to the treatments of a wide range of ocular surface diseases.

关键词： Magnetic nanoparticle Micelle Dexamethasone Eye drop Bioavailability Dry eye disease Cornea Conjunctiva

Tuning microstructures of Mg-Ce-Ni hydrogen storage alloys via Cu and carbon nanotube additions

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Nano Research 2024年第8期17卷 7203-7211页

作者： Linlin Zhang Liang Xiong Bingyang Gao Qingyun Shi Ying Wang Zhiya Han Zhenhua Zhang Chunli Wang Limin Wang Yong Cheng State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and engineering University of Science and Technology of ChinaHefei 230026China Purification Equipment Research Institute of CSIC Handan 056002China

Mg-based alloys are regarded as highly promising materials for hydrogen *** significant improvements of the properties for Mg-based alloys,challenges such as slow hydrogen absorption/desorption kinetics and high thermodynamic stability continue to limit their practical *** this study,to assess hydrogen storage alloys with enhanced properties,incorporating both internal microstructure modulation through the preparation of amorphous/nanocrystalline structures and surface property enhancement with the addition of Cu and carbon nanotubes(CNTs),the kinetic properties of activation and hydrogenation,thermodynamic properties,and dehydrogenation kinetics are *** results reveal a complementary interaction between the added Cu and CNTs,contributing to the superior hydrogen storage performance observed in sample 7A-2Cu-1CNTs with an amorphous/nanocrystalline structure compared to the other experimental ***,the samples are fully activated after the initial hydrogen absorption and desorption cycle,demonstrating outstanding hydrogenation kinetics under both high and low temperature experimental *** noteworthy is that the hydrogen absorption exceeds 1.8 wt.% within one hour at 333 ***,the activation energy for dehydrogenation is decreased to 64.71 kJ·mol^(–1).This research may offer novel insights for the design of new-type Mg-based hydrogen storage alloys,which possess milder conditions for hydrogen absorption and desorption.

关键词： Mg-Ni-Ce alloy hydrogen storage amorphous/nanocrystalline structure kinetics Cu and carbon nanotubes(CNTs)codoping

Low cycle fatigue properties and cyclic deformation behavior of as-extruded AZ31 magnesium alloy

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Transactions of Nonferrous Metals Society of China 2010年第B07期20卷 533-539页

作者： S.KWON K.SONG K.S.SHIN S.I.KWUN Department of materials science and engineering Korea University School of materials science and engineering Seoul National University

The low cycle fatigue(LCF)properties of as-extruded AZ31 Mg alloy were investigated under total strain amplitudes in the range of 0.4%-1.2%with strain rate of 1×10- 2s -*** to the twinning effect in compression during loading and the detwinning effect during unloading,the alloy showed an asymmetric hysteresis *** cyclic stress response exhibited cyclic hardening at high total strain *** cyclic deformation behaviors were discussed using the Coffin-Manson plot,which divided the plastic strain amplitudes into the tension side and the compression *** the LCF tests that were started from either tension or compression under a total strain amplitude of 1.0%,the interaction between the twinning effect and dislocation was *** twinning effect during the LCF test and the variation of the dislocation density were investigated using optical microscopy and transmission electron microscopy,respectively.

关键词： AZ31 magnesium alloy low cycle fatigue twinning dislocation

Effect of Co particles combined with rotating magnetic field on microstructure and properties of Sn35Bi/Cu joint

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China Welding 2024年

作者：薛行雁程东海张冠星李正兵董宏伟 State Key Laboratory of Advanced Brazing materials & Technology Zhengzhou Research Institute of Mechanical Engineering Co. Ltd. School of Aeronautical Manufacturing engineering Nanchang Hangkong University

By means of scanning electron microscopy（SEM）, energy dispersive spectroscopy（EDS）, X-ray diffraction（XRD） analysis, universal testing machine and wetting furnace, the effects of Co particles and rotating magnetic field on the microstructure and properties of Sn35Bi/Cu joint are investigated. The results show that after combined treatment, the formation of fine CoSn2particles in the weld can effectively refine the weld microstructure of Sn35Bi/Cu, reduce the thickness of intermetallic compounds（IMCs） layer, improve the wettability of the filler metal and increase the shear strength of the joint. After combined treatment, the shear strength of Sn35Bi-Co/Cu joint is up to56 MPa when Co content is 0.9 wt.%, which is 76% higher than that of Sn35Bi/Cu joint under conventional conditions, and the wetting angle of the composite filler metal is 19.1° when Co content is 0.6 wt.%, which is 40% lower than that of the conventional Sn35Bi filler metal.

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Microstructural Evolution and Softening Behavior of Simulated Heat-Affected Zone in 2219 Aluminum Alloy

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Acta Metallurgica Sinica(English Letters) 2017年第12期30卷 1177-1184页

作者： Xin-Jie Di Hui-Juan Xie Cui-Xin Chen Cai-Yan Deng Dong-Po Wang School of materials science and engineering Tianjin University School of materials science and engineering Hebei University of Technology

The effect of peak temperature （Tp） at 200, 300, 400, 500 and 550 ℃ on the microstructural evolution and softening behavior of the simulated heat-affected zone （HAZ） was studied in the 2219-T87 alloy by electron-backscatter diffraction, transmission electron microscopy, X-ray diffraction, micro-hardness and micro-tensile tests. The results showed that the grain size in the HAZs at 200-500 ℃ was comparable, but the number density of the strengthening precipitates （GP zones/θ′） decreased with increasing Tp. At a Tp of 550 ℃, the grain size significantly decreased and the distribution of the misorientation angles corresponded to the MacKenzie distribution. The GP zones/θ′ phase coarsened and translated into θ phases at Tp values in the range of 200-400 ℃. Increasing the Tp to 500 ℃ and above, some θ′ phases translated into θ phases and others dissolved into the α-Al matrix which led to an increase in the solid solution strengthening. The reduction of the number density of the GP zones/θ′ was responsible for the softening behavior.

关键词： 2219 aluminum alloy Peak temperature of thermal cycles Electron-backscatter diffraction(EBSD) Softening behavior Precipitates

Microstructural Characteristics and Mechanical Behavior of Spark Plasma-Sintered Cu–Cr–rGO Copper Matrix Composites

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Acta Metallurgica Sinica(English Letters) 2018年第7期31卷 761-770页

作者： Xin-Jiang Zhang Zhong-Kui Dai Xue-Ran Liu Wen-Chao Yang Meng He Zi-Run Yang School of materials science and engineering Yancheng Institute of Technology College of materials science and engineering Guangxi University

Copper matrix composites were prepared through spark plasma sintering （SPS） process, mixing fixed amount of reduced graphene oxide （rGO） with the different amounts of Cr. In the sintered bulk composites, the layered rGO network and uniform Cr particles distributed in the Cu matrix. Both of mechanical blending and freeze-drying stages of the wet-mixing process obtained the Cu/Cr/rGO mixture powders, and then SPS solid-phase sintering realized the faster densification of these mixture powders. The hardness and compressive yield strength of the Cu-Cr-rGO composites depicted the higher values than those of pure Cu and single rGO-added composite, and they were gradually increased with increasing Cr. The rGO/Cr hybrid second-phases are believed to be beneficial to strengthening Cu matrix. The relevant formation and strengthening mechanisms involved in Cu-Cr-rGO composites were discussed.

关键词： Metal matrix composites(MMC) Powder metallurgy Sintering Mechanical properties

Analysis of Oxides Formed on the Surface of the Alloy 690 in Hydrogenated Supercritical Water

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Acta Metallurgica Sinica(English Letters) 2016年第8期29卷 774-781页

作者： Jin Gao Fa-rong Wan Guo-ping Cao Kumar Sridharan Todd Allen School of materials science and engineering University of Science and Technology Beijing Department of materials science and engineering University of Wisconsin-Madison

The oxides formed on the surface of the alloy 690 in hydrogenated supercritical water at 400℃ for 1000 h were investigated using scanning electron microscopy,transmission electron microscopy,scanning transmission electron microscopy and energy-dispersive X-ray *** oxides on me surface of the alloy 690 exhibited multi-layer structure：an outer layer consisted of granular crystallites（NiO and NiFe_2O_4） and a compact inner layer（spinel and Cr_2O_3）.Chemical analysis indicated that the outer layer was enriched in nickel but depleted in chromium,whereas the inner layer was enriched in chromium and iron but depleted in *** inner layer was also characterized as layered structure by Fe-rich spinel on top of continuous Cr_2O_3 ***,Cr_2O_3 nodules were readily observed at the oxides/alloy interface.

关键词： Alloy 690 Supercritical water Oxides Corrosion

Effect of Sb on microstructure of semi-solid isothermal heat-treated AZ61-0.7Si magnesium alloy

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中国有色金属学会会刊：英文版 2009年第1期19卷 32-39页

作者：杨明波沈佳潘复生 College of materials science and engineering Chongqing Institute of Technology College of materials science and engineering Chongqing University

The microstructure of semi-solid isothermal heat-treated AZ61-0.7Si magnesium alloy was investigated, and compared with that of the Sb-modified AZ61-0.7Si alloy. The results indicate that it is possible to produce the AZ61-0.7Si alloy with a non-dendritic microstructure by semi-solid isothermal heat treatment, and adding 0.4% Sb can accelerate the non-dendritic microstructural evolution of the alloy. After being treated at 580 ℃ for 120 min, the Sb-modified AZ61-0.7Si alloys can obtain a non-dendritic microstructure with a higher liquid content (16%-18%) and finer unmelted primary solid particles (43-53 μm) compared with the alloy without Sb modification. In addition, after being treated at 580 ℃ for 120 min, the Mg2Si phases in the AZ61-0.7Si alloys with and without Sb modification change from initial Chinese script shape to granule and/or polygon shapes.

关键词：镁合金 AZ61-0.75Si合金热处理 Mg2Si相

Experimental investigation and numerical simulation of plastic flow behavior during forward-backward-radial extrusion process

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Progress in Natural science:materials International 2016年第6期26卷 650-656页

作者： A.Farhoumand R.Ebrahimi Department of materials science and engineering School of Engineering Shiraz University

Finite element method was employed to investigate the effect of process parameters of plastic deformation behavior in Forward-Backward-Radial Extrusion(FBRE) process. The result of an axisymmetric model shows that the friction between die components and the sample has a substantial effect on the material flow *** strain heterogeneity index(SHI) slightly decreases with an increase in friction, large portion of the sample experiences significant strain heterogeneity. Increasing the friction factor also localizes the strain heterogeneity effect in the backward section, and spread the effect in the forward section. Decreasing the friction in the FBRE process can reduce the amount of the strain heterogeneity in the product while decreases the required punch force substantially. Furthermore, an increase in gap thickness increases the deformation in the area close to the lower punch at the expense of the area in the vicinity of the upper punch. The numerical simulation has a good agreement with the experimental results which confirms the accuracy of the proposed finite element model.

关键词： Finite element analysis Extrusion Forming Plastic deformation Strain heterogeneity