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Synthesis,Crystal Structure,Spectroscopic Property and Redox Behavior of Zinc(Ⅱ) Complexes Containing Oligoaniline-functionalized Terpyridine Ligands
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作者 邱东方 赵茜 +2 位作者 刘克成 郭应臣 冯玉全 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2010年第10期1513-1518,共6页
Two novel mono-nuclear zinc(Ⅱ) complexes with oligoaniline-functionalized terpyridine ligands have been synthesized and verified by 1H-NMR,13C-NMR,Elemental Analysis (EA) and X-ray Diffraction (XRD). The UV-vis... Two novel mono-nuclear zinc(Ⅱ) complexes with oligoaniline-functionalized terpyridine ligands have been synthesized and verified by 1H-NMR,13C-NMR,Elemental Analysis (EA) and X-ray Diffraction (XRD). The UV-vis spectra show the ligand-centered (LC) π-π* transitions and intra-ligand charge transfer (1ILCT) transitions,and the 1ILCT band red-shifts with the increasing number of aromatic amine groups in the ligands. Complex [Zn(L1)2](PF6)2 with an aromatic amine group in ligand shows a strong emission peak at 523 nm in the MeCN solution at 293 K and a blue-shifted band at 517 nm in the alcoholic glass at 77 K. However,for complex [Zn(L2)2](PF6)2 containing aniline dimer modified ligand,no apparent emission can be observed in the MeCN solution at room temperature due to a PET non-radiative decay pathway. Both of them show multiplicate redox processes based on oligoaniline and terpyridine units. The shifts of redox potentials also reflect the D-A interactions between the oligoaniline units and [Zn(TPY)2]2+ core. 展开更多
关键词 OLIGOANILINE TERPYRIDINE zinc(II) crystal structure spectroscopic property electrochemical behavior
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Structure,Properties and Behavior of Kyanite:Use in Refractory Monolithics 被引量:4
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作者 Musa Karakus Robert Moore 《China's Refractories》 CAS 2003年第3期3-6,共4页
1 Introduction Kyanite is an important naturally occurring in-dustrial mineral and is used in the manufacture of avariety of industrial ceramic products; notable exam-ples include refractories and porcelains. It is a ... 1 Introduction Kyanite is an important naturally occurring in-dustrial mineral and is used in the manufacture of avariety of industrial ceramic products; notable exam-ples include refractories and porcelains. It is a high-pressure polymorph of the aluminosilicates of the ne-sosilicate group, which includes kyanite, sillimanite,and andalusite. These three aluminous or alumina-rich minerals are chemically identical with the compo-sition, Al;SiO;, but have different crystal structuresand physical properties. It is, however, their alumina 展开更多
关键词 of it or on Structure Properties and Behavior of Kyanite in
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Role of Ag addition on microstructure,mechanical properties,corrosion behavior and biocompatibility of porous Ti-30 at%Ta shape memory alloys 被引量:4
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作者 Mustafa Khaleel IBRAHIM Safaa Najah SAUD +1 位作者 Esah HAMZAH Engku Mohamad NAZIM 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第11期3175-3187,共13页
In the present study,the thermal,mechanical,and biological properties of xAg/Ti-30Ta(x=0,0.41,0.82 and 2.48 at%)shape memory alloys(SMAs)were investigated.The study was conducted using optical and scanning electron mi... In the present study,the thermal,mechanical,and biological properties of xAg/Ti-30Ta(x=0,0.41,0.82 and 2.48 at%)shape memory alloys(SMAs)were investigated.The study was conducted using optical and scanning electron microscopy(SEM),X-ray diffractometry(XRD),compression test,and shape memory testing.The xAg/Ti-Ta was made using a powder metallurgy technique and microwave-sintering process.The results revealed that the addition of Ag has a significant effect on the pore size and shape,whereas the smallest pore size of 11μm was found with the addition of 0.41 at%along with a relative density of 72%.The fracture stress and strain increased with the addition of Ag,reaching the minimum values around 0.41 at%Ag.Therefore,this composition showed the maximum stress and strain at fracture region.Moreover,0.82 Ag/Ti-Ta shows more excellent corrosion resistance and biocompatibility than other percentages,obtaining almost the same behaviour of the pure Ti and Ti-6Al-4V alloys,which can be recommended for their promising and potential response for biomaterial applications. 展开更多
关键词 porous xAg/Ti-Ta shape memory alloys(SMAs) microwave sintering process microstructure characteristics mechanical properties and corrosion behavior bioactivity
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Cu Partitioning Behavior and Its Effect on Microstructure and Mechanical Properties of 0.12C-1.33Mn-0.55Cu Q&P Steel 被引量:6
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作者 陈连生 HU Baojia +4 位作者 XU Jinghui 田亚强 ZHENG Xiaoping SONG Jinying XU Yong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第5期1179-1185,共7页
Cu, as an austenitic stable element, is added to steel in order to suppress the adverse effects of high content of C and Mn on welding. Based on C partitioning, Cu and Mn partitioning can further improve the stability... Cu, as an austenitic stable element, is added to steel in order to suppress the adverse effects of high content of C and Mn on welding. Based on C partitioning, Cu and Mn partitioning can further improve the stability of retained austenite in the intercritical annealing process. A sample of low carbon steel containing Cu was treated by the intercritical annealing, then quenching process(I&Q). Subsequently, another sample was treated by the intercritical annealing, subsequent austenitizing, then quenching and partitioning process(I&Q&P). The effects of element partitioning behavior in intercritical region on the microstructure and mechanical properties of the steel were studied. The results showed that after the I&Q process ferrite and martensite could be obtained, with C, Cu and Mn enriched in the martensite. When intercritically heated at 800 ℃, Cu and Mn were partitioned from ferrite to austenite, which was enhanced gradually as the heating time was increased. This partitioning effect was the most obvious when the sample was heated at 800 ℃ for 40 min. At the early stage of α→γ transformation, the formation of γ was controlled by the partitioning of carbon, while at the later stage, it was mainly affected by the partitioning of Cu and Mn. After the I&Q&P process, the partitioning effect of Cu and Mn element could be retained. C was assembled in retained austenite during the quenching and partitioning process. The strength and elongation of I&Q&P steel was increased by 5 305 MPa% compared with that subjected to Q&P process. The volume fraction of retained autensite was increased from 8.5% to 11.2%. Hence, the content of retained austenite could be improved significantly by Mn and Cu partitioning, which increased the elongation of steel. 展开更多
关键词 low carbon high strength steel intercritical annealing element partitioning behavior retained austenite mechanical properties
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Wear Behavior of In-situ TiC Particles Reinforced Aluminum Matrix Composite 被引量:3
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作者 隋艳伟 CHEN Xiao +5 位作者 WANG Rui QI Jiqiu WEI Fuxiang HE Yezeng MENG Qingkun 孙智 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第3期552-556,共5页
The microstructure, tensile property and wear resistance of 7075 aluminum matrix composite reinforced with TiC particles prepared by in-situ reaction casting were investigated. The effect of TiC reinforcement on wear ... The microstructure, tensile property and wear resistance of 7075 aluminum matrix composite reinforced with TiC particles prepared by in-situ reaction casting were investigated. The effect of TiC reinforcement on wear behavior was analyzed. The wear mechanism was also discussed. A micro-mechanism model of reaction kinetics for synthesis of TiC was acquired. Results show that TiC could increase the tensile and yield strength, but decrease the elongation. Besides, TiC particles improve the property of wear resistance of 7075 aluminum alloy. The wear mechanisms include abrasive wear and adhesive wear in wear test process. 展开更多
关键词 in-situ reaction TiC tensile properties wear behavior
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Preparation,Structures,Thermal Properties and Sintering Behaviors of B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 Glass 被引量:3
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作者 丁阚俊杰 chen nan +1 位作者 杜国平 zhang aisheng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第6期1323-1328,共6页
B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 glass with different Al_2O_3 contents(1mol%, 3mol%, 5mol%, and 7mol%) was prepared, and it was intended to be used as lead-free and low-melting glass sealants for solid oxide fuel cells.... B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 glass with different Al_2O_3 contents(1mol%, 3mol%, 5mol%, and 7mol%) was prepared, and it was intended to be used as lead-free and low-melting glass sealants for solid oxide fuel cells. The effects of Al_2O_3 content on the structures, thermal properties, and sintering behaviors of the B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 glass were investigated in detail. The Al_2O_3 content largely influenced the structures and thermal properties of the glass. When the Al_2O_3 content 5mol%, the transition temperature of the glass decreased with the Al_2O_3 content, while the crystallization temperature increased with the Al_2O_3 content. However, higher Al_2O_3 content degraded the stability of the glass. The B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 glass with 5 mol% Al_2O_3 content exhibits the optimal sintering densification characteristics and can be used as glass sealants for solid oxide fuel cells. 展开更多
关键词 B2O3-SiO2-ZnO-BaO-Al2O3 glass thermal properties sintering behavior densification crystallization
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A Pair of 3D Homochiral Coordination Polymers with Open Channels Constructed by Lactic Acid Derivative Ligands and In-situ Formed Anions 被引量:1
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作者 徐中轩 马钰璐 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2017年第4期671-678,共8页
With the help of in-situ formed CH_3COO- anion, a pair of 3D homochiral coordination polymers with open channels were constructed by the assembly of lactic acid derivative ligands, 1.4-DIB ligands and Cd(II) ions, n... With the help of in-situ formed CH_3COO- anion, a pair of 3D homochiral coordination polymers with open channels were constructed by the assembly of lactic acid derivative ligands, 1.4-DIB ligands and Cd(II) ions, namely [Cd3((R)-CIA)2(CH3CO2)_2(1.4-DIB)2(H2O)2]·x(Guest)(1-D) and [Cd3((S)-CIA)2(CH3CO2)2(1.4-DIB)2(H2O)2]·x(Guest)(1-L). They contain 1D interesting ladder-like Cd-(R)-CIA(3-) chains and exhibit SHG-active behavior and photoluminescent property. 展开更多
关键词 homochiral coordination polymers lactic acid derivative ligand open channel SHG-active behavior photoluminescent property
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Positron Annihilation Behaviors and Magnetic Properties of Single-phase Nd_2Fe_(14)B and NanocompositeNd_2Fe_(14)B/α-Fe Magnets
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作者 Dingkang XIONG, Xiaokai SUN,Liangyue XIONG, Wei LIU,Tong ZHAO and Zhidong ZHANG Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第4期453-456,共4页
Positron annihilation behaviors have been studied in the single phase Nd2Fe14B magnet and the nanocomposite Nd2Fe14B/α-Fe magnet, prepared by melt spinning. The results showed that the number of vacancy-cluster at gr... Positron annihilation behaviors have been studied in the single phase Nd2Fe14B magnet and the nanocomposite Nd2Fe14B/α-Fe magnet, prepared by melt spinning. The results showed that the number of vacancy-cluster at grain boundaries increases with increasing annealing temperature for the both types of magnets. The increase of this kind of defect can improve the coercivity of the single-phase magnet. Conversely,the increase of vacancy-cluster amount leads to decreasing of the coercivity for the nanocomposite magnet. It implies that the mechanism of dominant magnetic hardening for the two types of magnets is different, and the domain walls pinning mechanism in the single-phase magnet and the reversal magnetization nucleation mechanism in the nanocomposite magnet operate, respectively. 展开更多
关键词 ND Positron Annihilation Behaviors and Magnetic Properties of Single-phase Nd2Fe
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RESEARCH ON THE RHEOLOGY OF MAGNESIUM OXYCHLORIDE CEMENT Ⅰ—RHEOLOGICAL BEHAVIOR
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作者 H.F.Yu and P.Q.Liu Department of Materials Science and Engineering, Shenyang Architectural and Civil Engineering Institute, Shenyang 110015, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1999年第5期1041-1044,共4页
The rheology of magnesium oxychloride cement (MOC) was presented. The rheological properties and thixotropic behaviors of the MOC pastes were determined with a rotating viscometer. The results have showed significant ... The rheology of magnesium oxychloride cement (MOC) was presented. The rheological properties and thixotropic behaviors of the MOC pastes were determined with a rotating viscometer. The results have showed significant difference between the MOC and portland cement in terms of their rheological behaviors. The yield stress and plastic viscosity of the MOC pastes are much larger than those of portland cement pastes. Therefore, the MOC has a better cohesive property. 展开更多
关键词 magnesium oxychloride cement(MOC) rheological property thixotropic behavior
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Spin-dependent transport characteristics of nanostructures based on armchair arsenene nanoribbons
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作者 杨开巍 李明君 +3 位作者 张小姣 李新梅 高永立 龙孟秋 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第9期542-548,共7页
By employing non-equilibrium Green's function combined with the spin-polarized density-functional theory, we investigate the spin-dependent electronic transport properties of armchair arsenene nanoribbons(a As NRs)... By employing non-equilibrium Green's function combined with the spin-polarized density-functional theory, we investigate the spin-dependent electronic transport properties of armchair arsenene nanoribbons(a As NRs). Our results show that the spin-metal and spin-semiconductor properties can be observed in a As NRs with different widths. We also find that there is nearly 100% bipolar spin-filtering behavior in the a As NR-based device with antiparallel spin configuration. Moreover, rectifying behavior and giant magnetoresistance are found in the device. The corresponding physical analyses have been given. 展开更多
关键词 armchair arsenene nanoribbons spin-dependent electronic transport property spin-polarized density-functional theory bipolar spin-filtering behavior
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Review of the experimental studies of the cracking behaviors of fracturedrocks under compression
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作者 Jun Xu Sen Luo Xiaochun Xiao 《Geohazard Mechanics》 2024年第2期59-82,共24页
In recent years, many useful experimental results on the cracking behaviors of fractured rocks have been obtainedvia uniaxial, biaxial, triaxial, and Split Hopkinson Pressure Bar (SHPB) tests. In this paper, the influe... In recent years, many useful experimental results on the cracking behaviors of fractured rocks have been obtainedvia uniaxial, biaxial, triaxial, and Split Hopkinson Pressure Bar (SHPB) tests. In this paper, the influence of theinclination angle of flaws, number of flaws, and patterns of cracks on the mechanical properties during the failureprocess under static loading and dynamic loading conditions is introduced and reviewed. The results show thatthe presence of cracks can decrease the strengths of precracked specimens, and the inclination angles, numbers,and crack patterns of pre-existing flaws can change the mechanical properties and cracking behaviors of precracked specimens. Under static loading, the closer the inclination angle is to 90, the greater the strength, theelastic modulus, and the peak strain of the precracked specimen. However, under dynamic loading, the influenceof the inclination angle varies, and the strength can increase or decrease, possibly in a V-shaped manner. Thischange can be determined by multiple factors, such as the loading path, the materials of the precracked specimen,and the number of pre-existing cracks. Under dynamic loading, the precracked specimen usually exhibits an Xshaped conjugated failure. Additionally, some problems in the study of the cracking behaviors of fractured rocksand related future research are described and presented, and corresponding suggestions and solutions are given.In particular, excavation in deep rock engineering, support of the rock surrounding the tunnel, and mining engineering have important scientific and engineering significance. 展开更多
关键词 Fractured rocks Mechanical properties Cracking behaviors Static or quasistatic loading Dynamic loading
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Coagulation behavior and floc properties of compound bioflocculant–polyaluminum chloride dual-coagulants and polymeric aluminum in low temperature surface water treatment 被引量:11
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作者 Xin Huang Shenglei Sun +3 位作者 Baoyu Gao Qinyan Yue Yan Wang Qian Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2015年第4期215-222,共8页
This study was intended to compare coagulation behavior and floc properties of two dualcoagulants polyaluminum chloride–compound bioflocculant(PAC–CBF)(PAC dose first) and compound bioflocculant–polyaluminum ch... This study was intended to compare coagulation behavior and floc properties of two dualcoagulants polyaluminum chloride–compound bioflocculant(PAC–CBF)(PAC dose first) and compound bioflocculant–polyaluminum chloride(CBF–PAC)(CBF dose first) with those of PAC alone in low temperature drinking water treatment. Results showed that dualcoagulants could improve DOC removal efficiency from 30% up to 34%. Moreover, CBF contributed to the increase of floc size and growth rate, especially those of PAC–CBF were almost twice bigger than those of PAC. However, dual-coagulants formed looser and weaker flocs with lower breakage factors in which fractal dimension of PAC–CBF flocs was low which indicates a looser floc structure. The floc recovery ability was in the following order:PAC–CBF 〉 PAC alone 〉 CBF–PAC. The flocculation mechanism of PAC was charge neutralization and enmeshment, meanwhile the negatively charged CBF added absorption and bridging effect. 展开更多
关键词 Coagulation behavior Floc properties Dual-coagulants Surface water
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In Vitro Evaluation of the Feasibility of Commercial Zn Alloys as Biodegradable Metals 被引量:28
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作者 C.Wang H.T.Yang +1 位作者 X.Li Y.F.Zheng 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2016年第9期909-918,共10页
In this work, three widely used commercial Zn alloys (ZA4-1, ZA4-3, ZA6-1 ) were purchased and pre- pared by hot extrusion at 200℃. The microstructure, mechanical properties, corrosion behaviors, biocompatibility a... In this work, three widely used commercial Zn alloys (ZA4-1, ZA4-3, ZA6-1 ) were purchased and pre- pared by hot extrusion at 200℃. The microstructure, mechanical properties, corrosion behaviors, biocompatibility and hemocompatibility of Zn alloys were studied with pure Zn as control, Commercial Zn alloys demonstrated increased strength and superb elongation compared with pure Zn. Accelerated corrosion rates and uniform corrosion morphologies were observed in terms of commercial Zn alloys due to galvanic effects between Zn matrix and α-Al phases. 100% extracts of ZA4-1 and ZA6-1 alloys showed mild cytotoxicity while 50% extracts of all samples displayed good biocompatibility. Retardant cell cycle and inhibited stress fibers expression were observed induced by high concentration of Zn^2+ releasing during corrosion. The hemolysis ratios of Zn alloys were lower than 1% while the adhered platelets showed slightly activated morphologies. In general, commercial Zn alloys possess promising mechanical properties, appropriate corrosion rates, significantly improved biocompatibility and good hemocompatibility in comparison to pure Zn. It is feasible to develop biodegradable metals based on commercial Zn alloys. 展开更多
关键词 Commercial Zn alloys Biodegradable metals Mechanical properties Corrosion behaviors Cytotoxicity Hemocompatibility
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Synthesis of high-purity silver nanorods with tunable plasmonic properties and sensor behavior 被引量:4
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作者 Haiying Xu Caixia Kan +5 位作者 Changzong Miao Changshun Wang Jingjing Wei Yuan Ni Beibei Lu Daning Shi 《Photonics Research》 SCIE EI 2017年第1期27-32,共6页
Through anisotropic Ag overgrowth on the surface of Au nanobipyramids(Au NBPs), high-purity and sizecontrolled Ag nanorods(Au/Ag NRs) are obtained by a simplified purification process. The diameters of the Au/Ag NRs a... Through anisotropic Ag overgrowth on the surface of Au nanobipyramids(Au NBPs), high-purity and sizecontrolled Ag nanorods(Au/Ag NRs) are obtained by a simplified purification process. The diameters of the Au/Ag NRs are determined by the size of the as-prepared Au NBPs, and the lengths of the Au/Ag NRs are tunable using different amounts of Ag precursor in the growth solution. Surface-enhanced Raman scattering(SERS) studies using Rhodamine-6G(R6G) as a test molecule indicate that the Au/Ag NRs have excellent sensing potential. The tunable optical properties and strong electromagnetic effect of the Au/Ag NRs, along with their superior SERS signal enhancement, show that Au/Ag NRs are promising for further applications in plasmon sensing and biomolecular detection. 展开更多
关键词 NBP Ag Synthesis of high-purity silver nanorods with tunable plasmonic properties and sensor behavior high
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Effect of trace HA on microstructure, mechanical properties and corrosion behavior of Mg-2Zn-0.5Sr alloy 被引量:8
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作者 Jian-Xing Li Yuan Zhang +1 位作者 Jing-Yuan Li Jian-Xin Xie 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2018年第2期299-310,共12页
Effect of the addition of trace HA particles into Mg-2Zn-0.5Sr on microstructure, mechanical properties, and bio-corrosion behavior was investigated in comparison with pure Mg. Microstructures of the Mg-2Zn-0.5Sr-xHA ... Effect of the addition of trace HA particles into Mg-2Zn-0.5Sr on microstructure, mechanical properties, and bio-corrosion behavior was investigated in comparison with pure Mg. Microstructures of the Mg-2Zn-0.5Sr-xHA composites (x= 0, 0.1 and 0.3 wt%) were characterized by optical microscopy (OM), scanning electron microscopy (SEM) equipped with energy dispersion spectroscopy (EDS) and X-ray diffraction (XRD). Results of tensile tests at room temperature show that yield strength (YS) of Mg- 2Zn-0.5Sr/HA composites increases significantly, but the ultimate tensile strength (UTS) and elongation decrease with the addition of HA particles from 0 up to 0.3 wt%. Bio-corrosion behavior was investigated by immersion tests and electrochemical tests. Electrochemical tests show that corrosion potential (Ecorr) of Mg-2Zn-0.5Sr/HA composites significantly shifts toward nobler direction from -1724 to -1660 mVscE and the corrosion current density decreases from 479.8 to 280.8 p.Acm^-2 with the addition of HA particles. Immersion tests show that average corrosion rate of Mg-2Zn-0.BSr/HA composites decreases from 11.7 to 9.1 mm/year with the addition of HA particles from 0 wt% up to 0.3 wt%. Both microstructure and mechanical properties can be attributed to grain refinement and mechanical bonding of HA particles with second phases and α-Mg matrix. Bio-corrosion behavior can be attributed to grain refinement and the formation of a stable and dense CaHPO4 protective film due to the adsorption of Ca^2+ on HA particles. Our analysis shows that the Mg-2Zn-0.5Sr/0.3HA with good strength and corrosion resistance can be a good material candidate for biomedical applications. 展开更多
关键词 Magnesium alloys Bio-composites Hydroxyapatite Microstructure Mechanical property Bio-corrosion behavior
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Composite structural modeling and tensile mechanical behavior of graphene reinforced metal matrix composites 被引量:9
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作者 苏益士 李赞 +5 位作者 俞洋 赵蕾 李志强 郭强 熊定邦 张荻 《Science China Materials》 SCIE EI CSCD 2018年第1期112-124,共13页
Owing to its distinguished mechanical stiffness and strength, graphene has become an ideal reinforcing material in kinds of composite materials. In this work, the graphene(reduced graphene oxide) reinforced aluminum... Owing to its distinguished mechanical stiffness and strength, graphene has become an ideal reinforcing material in kinds of composite materials. In this work, the graphene(reduced graphene oxide) reinforced aluminum(Al)matrix composites were fabricated by flaky powder metallurgy. Tensile tests of pure Al matrix and graphene/Al composites with bioinspired layered structures are conducted.By means of an independently developed Python-based structural modeling program, three-dimensional microscopic structural models of graphene/Al composites can be established, in which the size, shape, orientation, location and content of graphene can be reconstructed in line with the actual graphene/Al composite structures. Elastoplastic mechanical properties, damaged materials behaviors, grapheneAl interfacial behaviors and reasonable boundary conditions are introduced and applied to perform the simulations. Based on the experimental and numerical tensile behaviors of graphene/Al composites, the effects of graphene morphology,graphene-Al interface, composite configuration and failure behavior within the tensile mechanical deformations of graphene/Al composites can be revealed and indicated, respectively.From the analysis above, a good understanding can be brought to light for the deformation mechanism of graphene/Al composites. 展开更多
关键词 graphene/Al composites structural modeling mechanical properties composite configuration failure behavior
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Microstructure and tensile behavior of 2D-C_f/AZ91D composites fabricated by liquid–solid extrusion and vacuum pressure infiltration 被引量:2
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作者 Shaolin Li Lehua Qi +2 位作者 Ting Zhang Jiming Zhou Hejun Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2017年第6期541-546,共6页
2D carbon fiber reinforced AZ91 D matrix composites(2D-C_f/AZ91 D composites) were fabricated by liquid–solid extrusion and vacuum pressure infiltration technique(LSEVI). In order to modify the interface between ... 2D carbon fiber reinforced AZ91 D matrix composites(2D-C_f/AZ91 D composites) were fabricated by liquid–solid extrusion and vacuum pressure infiltration technique(LSEVI). In order to modify the interface between fibers and matrix and protect the fiber, pyrolytic carbon(Py C) coating was deposited on the surface of T700 carbon fiber by chemical vapor deposition(CVD). Microstructure observation of the composites revealed that the composites were well fabricated by LSEVI. The segregation of aluminum at fiber surface led to the formation of Mg_(17)Al_(12) precipitates at the interface. The aluminum improved the infiltration of the alloy and Py C coating protected the fibers effectively. The ultimate tensile strength of 2D-C_f/AZ91 D composites was about 400 MPa. The fracture process of 2D-C_f/AZ91 D composites was transverse fiber interface cracking–matrix transferring load–longitudinal fibers bearing load–longitudinal fibers breaking. 展开更多
关键词 Magnesium matrix composites Microstructure Tensile properties Fracture behavior
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Electrochemical behavior of praseodymium and Pr-Al intermetallics in LiCl-KCl-AlCl_3-PrCl_3 melts 被引量:1
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作者 唐浩 邓辉 +5 位作者 任清波 蔡定洲 任一鸣 邵浪 颜永得 张密林 《Journal of Rare Earths》 SCIE EI CAS CSCD 2016年第4期428-434,共7页
The electrochemical behavior of Pr(Ⅲ) and formation process of Pr-Al intermetallics were investigated by different electrochemical methods. The reduction of Pr(Ⅲ) ion to metallic Pr is an one-step three-electron... The electrochemical behavior of Pr(Ⅲ) and formation process of Pr-Al intermetallics were investigated by different electrochemical methods. The reduction of Pr(Ⅲ) ion to metallic Pr is an one-step three-electrons reaction. The reversibility of Pr(Ⅲ)/Pr(0) system was evaluated by cyclic voltammograms with different scan rates. The co-reduction of Pr(Ⅲ) and Al(Ⅲ) ions formed three different Pr-Al intermetallics at electrode potentials around-1.40,-1.80,and-1.95V vs.Ag/AgCl at 723 K,respectively.Open-circuit chronopotentiometry and electromotive force(emf) measurements were carried out to estimate the relative molar Gibbs energies of Pr for the formation of different Pr-Al intermetallics in the temperature range of 723–843K.The activities of Pr in the Pr-Al intermetallic compounds were calculated. 展开更多
关键词 molten chlorides Pr-Al intermetallics electrochemical behavior thermodynamic properties activity rare earths
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Sintering characteristics and microwave dielectric properties of 0.5Ca_(0.6)La_(0.267)TiO_3-0.5Ca(Mg_(1/3)Nb_(2/3))O_3 ceramics prepared by reaction-sintering process 被引量:1
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作者 Jiamao Li Peng Xu +1 位作者 Tai Qiu Lichun Yao 《Journal of Rare Earths》 SCIE EI CAS CSCD 2018年第4期404-408,共5页
0.5 Ca(0.6La0.267TiO3-0.5 Ca(Mg1/3Nb2/3)O3(5 CLT-5 CMN) ceramics were prepared by a reaction-sintering process and their sintering characteristics, microwave dielectric properties were investigated in detail.With... 0.5 Ca(0.6La0.267TiO3-0.5 Ca(Mg1/3Nb2/3)O3(5 CLT-5 CMN) ceramics were prepared by a reaction-sintering process and their sintering characteristics, microwave dielectric properties were investigated in detail.Without any calcination stage involved,a mixture of CaCO_3, La_2 O_3, TiO_2, MgO and Nb_2 O_5 was pressed and sintered directly. Pure phase 5 CLT-5 CMN ceramics with high density and dense microstructure can be obtained after sintered at 1400 ℃ for 4 h. Compared with those prepared by the conventional ceramic route, 5 CLT-5 CMN ceramics produced by the reaction-sintering process exhibit slightly higher dielectric constant and Q×f value. Fine microwave dielectric properties of ε_r= 56.4, Q×f= 48,550 GHz and T_f = +8.7 ppm/℃ for 5 CLT-5 CMN ceramics sintered at 1400 ℃ for 4 h are obtained, suggesting reactionsintering process is a simple and efficient method to produce pure phase 5 CLT-5 CMN ceramics as a potential candidate for the fabrication of microwave devices. 展开更多
关键词 Microwave ceramics Sintering behavior Dielectric properties Reaction sintering Rare earths
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Tensile properties and fracture behavior of friction stir welded joints of Fe-32Mn-7Cr-1Mo-0.3N steel at cryogenic temperature 被引量:1
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作者 Yi-jun Li Rui-dong Fu +2 位作者 Yan Li Yan Peng Hui-jie Liu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2018年第1期157-162,共6页
This study investigates the cryogenic tensile properties and fracture behavior of fiction stir welded and post-weld heat-treated joints of 32Mn-7Cr-1Mo-0.3N steel. Cryogenic brittle fracture, which occurred in the as-... This study investigates the cryogenic tensile properties and fracture behavior of fiction stir welded and post-weld heat-treated joints of 32Mn-7Cr-1Mo-0.3N steel. Cryogenic brittle fracture, which occurred in the as-welded joint, is related to the residual particles that contain tungsten in the joint band structure. Post-weld water toughening resulted in the cryogenic intergranular brittleness of the joint, which is related to the non-equilibrium segregation of solute atoms during the post-weld water toughening. Annealing at 55OC for 30rain can effectively inhibit the cryogenic intergranular brittleness of the post- weld water-toughened joint. The yield strength, ultimate tensile strength, and uniform elongation of the annealed joint are approximately 95%, 87%, and 94% of the corresponding data of the base metal. 展开更多
关键词 High nitrogen steel Friction stir welding Post-weld beat treatment Tensile properties Fracture behavior Cryogenic
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