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Journal of Materials Science & Technology 2001年第5期17卷 579-580页

作者： Research Notes h.Suto Tohoku University, Aoba-hachiman 5-4-12, Sendai, 980-0871, Japan Tohoku Univ. Aoba-Hachiman 5-4-12 Sendai 980-0871 Japan

Ultrahigh-strength mortar mixed surface-oxidized silicon carbide as a fine aggregate was prepared by means of press-casting followed by curing in an autoclave. The relation between modulus of elssticity up to 111 GPa and compressive strength up to 360 MPa of mortar mixed silicon carbide was discussed and it was revealed that the contributions of the aggregate hardness and of the interfacial strength between the aggregate and the cement paste on the elasticity of mortar were imporant.

关键词： high Relation between Modulus of Elasticity and Compressive Strength of Ultrahigh-Strength Mortar with Mixed Silicon Carbide as Fine Aggregate SIC

Fe-Si droplets associated with graphite on blast furnace coke

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International Journal of Minerals,Metallurgy and Materials 2012年第6期19卷 478-482页

作者： Stanislav S.Gornostayev Timo M.J.Fabritius Olavi Kerkkonen Jouko J.hrkki Laboratory of Process Metallurgy University of OuluOulu 90014Finland Ruukki Metals Oy Raahe 92102Finland

Fe-Si droplets on the surface of blast furnace （BF） coke from 25 to 50 cm at the tuyere level are mostly composed of Fe3Si, which has various shapes （round, elongated, and irregular） and penetration degrees into the BF coke matrix. The shapes and penetration degrees may depend on the saturation of molten iron by silicon during interaction with the coke matrix. The droplets are covered by a tiny shell of carbon. Graphite observed inside the droplets can be divided into two categories： well-formed tabular crystals with relatively large size and flakes with structures similar as those in cast iron. The textures of the droplets reflect composition, interaction with the coke matrix, and cooling conditions.

关键词： metallurgical coke graphite iron blast furnaces

Novel approaches for the prediction of density of glycol solutions

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Journal of Natural Gas Chemistry 2008年第3期17卷 298-302页

作者： A.Bahadori Y.hajizadeh h.B.Vuthaluru M.O.Tade S.Mokhatab Department of Chemical Engineering Curtin University of Technology Institute of Petroleum Engineering Heriot-Watt University Process Technology Department Tehran Raymand Consulting Engineers

Two new approaches for the accurate prediction of densities of the commonly used glycol solutions in the gasprocessing industry are presented in the article. The first approach is based on developing a simple-to-use polynomial correlation for an appropriate prediction of density of glycol solutions as a function of temperature and weight percent of glycols in water, where the obtained results show very good agreement with the reported experimental data. The second approach, however, is based on the artificial neural networks （ANN） methodology, wherein the results demonstrate the ability of the introduced method to predict reasonably accurate densities of glycols under operating conditions. Comparisons of the two novel approaches indicated that the simple-to-use correlation appears to be superior owing to its simplicity and clear numerical background, wherein the relevant coefficients can be retuned if new and more accurate data are available in the future. The average deviation of the new proposed polynomial correlation results from reported data is 0.64 kg/m^3 whereas the average deviation of artificial neural networks （ANN） methodology from reported data is 1.1 kg/m^3.

关键词： glycols density polynomial correlation artificial neural networks gas processing

Ultrafast probing of plasma ion temperature in proton–boron fusion by nuclear resonance fluorescence emission spectroscopy

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Matter and Radiation at Extremes 2022年第3期7卷 1-9页

作者： T.-T.Qin W.Luo h.-Y.Lan W.-M.Wang School of Nuclear Science and Technology University of South ChinaHengyang 421001China Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices and Department of Physics Renmin University of ChinaBeijing 100872China

ABSTRACT Aneutronic fusion reactions such as proton-boron fusion could efficiently produce clean energy with quite low neutron ***,as a consequence,conventional neutron spectral methods for diagnosing plasma ion temperature would no longer ***,finding a way to probe the ion temperature in aneutronic fusion plasmas is a crucial ***,we present a method to realize ultrafast in situ probing of^(11)B ion temperature for proton-boron fusion by Doppler broadening of the nuclear resonance fluorescence(NRF)emission *** NRF emission is excited by a collimated,intenseγ-ray beam generated from submicrometer wires irradiated by a recently available petawatt(PW)laser pulse,where theγ-ray beam generation is calculated by three-dimensional particle-in-cell *** the laser power is higher than 1 PW,five NRF signatures of a^(11)B plasma can be clearly identified with high-resolutionγ-ray detectors,as shown by our Geant4 *** correlation between the NRF peak width and^(11)B ion temperature is discussed,and it is found that NRF emission spectroscopy should be sensitive to 11B ion temperatures T_(i)>2.4 *** probing method can also be extended to other neutron-free-fusion isotopes,such as^(6)Li and^(15)N.

关键词： spectrum boron spectroscopy

Surface hydrophobicity: effect of alkyl chain length and network homogeneity

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Frontiers of Chemical Science and Engineering 2021年第1期15卷 90-98页

作者： Wenqian Chen Vikram Karde Thomas N.h.Cheng Siti S.Ramli Jerry Y.Y.heng Department of Chemical Engineering Imperial College LondonLondonSW72AZUK Department of Food Technology Faculty of Applied SciencesUniversiti Teknologi MARA(UiTM)Shah AlamSelangorMalaysia

Understanding the nature of hydrophobicity has fundamental importance in environmental *** spherical silica nanoparticles(diameter=369±7 nm)as the model material,the current study investigates the relationship between the alkyl chain network and *** alkyl silanes with different chain length(triethoxymethylsilane(C1)***(octyl)silane(C8))were utilised separately for the functionalisation of the *** contact angle and inverse gas chromatography results show that the alkyl chain length is essential for controlling hydrophobicity,as the octyl-functionalised nanoparticles were highly hydrophobic(water contact angle=150.6°±6.6°),whereas the methyl-functionalised nanoparticles were hydrophilic(i.e.,water contact angle=0°,similar to the pristine nanoparticles).The homogeneity of the octyl-chain network also has a significant effect on hydrophobicity,as the water contact angle was reduced significantly from 148.4°±3.5°to 30.5°±1.0°with a methyl-/octyl-silane mixture(ratio=160:40µL·g^(–1) nanoparticles).

关键词： hydrophobicity surface energy wettability alkyl chain network silica nanoparticle

Effect of radiation on compressibility of hot dense sodium and iron plasma using improved screened hydrogenic model with𝑙splitting

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Chinese Physics B 2021年第3期30卷 225-236页

作者： Amjad Ali G Shabbir Naz Rukhsana Kouser Ghazala Tasneem M Saleem Shahzad Aman-ur-Rehman M h Nasim Department of Physics and Applied Mathematics Pakistan Institute of Engineering and Applied SciencesIslamabad 45650Pakistan Department of Nuclear Engineering Pakistan Institute of Engineering and Applied SciencesIslamabad 45650Pakistan

high pressure investigations of matter involve the study of strong shock wave dynamics within the materials which gives rise to many thermal effects leading to dissociation of molecules,ionization of atoms,and radiation emission,*** response of materials experiencing a strong shock can be determined by its shock hugoniot calculations which are frequently applied in numerical and experimental studies in inertial confinement fusion,laboratory astrophysical plasma,*** studies involve high energy density plasmas in which the radiation plays an important role in determining the energy deposition and maximum compressibility achieved by the shock within *** this study,we present an investigation for the effect of radiation pressure on the maximum compressibility of the material using shock hugoniot *** shock hugoniot calculations,an equation of state(EOS)is developed in which electronic contributions for EOS calculations are taken from an improved screened hydrogenic model with−l splitting(I-ShML)[high Energy Density Physics(2018)2648]under local thermodynamic equilibrium(LTE)*** thermal ionic part calculations are adopted from the state of the art Cowan model while the cold ionic contributions are adopted from the scaled binding energy *** Shock hugoniot calculations are carried out for sodium and iron plasmas and our calculated results show excellent agreement with published results obtained by using either sophisticated self-consistent models or the first principle study.

关键词： self-consistent-field methods thermodynamics of plasmas average atom model shock hugoniot calculation

Characterization of mechanical and corrosion properties of cryorolled Al 1100 alloy:Effect of annealing and solution treatment

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Transactions of Nonferrous Metals Society of China 2021年第10期31卷 2949-2961页

作者： S.A.ZAKARIA A.S.ANASYIDA h.ZUhAILAWATI B.K.DhINDAW N.A.JABIT A.ISMAIL Structural Materials Niche Area School of Materials&Mineral Resources EngineeringUniversiti Sains Malaysia14300 Nibong TebalPenangMalaysia Indian Institute of Technology Kharagpur 721302 India Department of Materials Engineering and Design Faculty of Mechanical and Manufacturing Engineering Universiti Tun Hussein Onn Malaysia86400 Batu PahatJohorMalaysia

Effect of annealing and solution treatment prior to cryorolling on the formation of initial structure influencing microstructure formation from nano to micron scale and resultant mechanical and corrosion properties in Al 1100 alloy has been studied in *** subjecting to 50%cryorolling,samples were pre-annealed at 250℃ for 2 h and pre-solution treated at 540℃ for 1 h.X-ray diffraction and hRTEM techniques were used to understand the crystallite size,lattice strain and dislocation configuration in the processed *** results indicate that the pre-annealed sample has the highest grain aspect ratio(4.43),the smallest crystallite size(37.53 nm),the highest lattice strain(9.12×10^(−3))and the highest dislocation density(45.16×10^(13) m^(−2))among the tested *** pre-annealed sample shows a significant improvement of 43.44%,24.64%and 20.33%in hardness,ultimate tensile strength and yield *** pre-annealed and pre-solution treated samples show improved corrosion resistance when compared to cryorolled samples without any pre-treatment,with the pre-annealed sample showing the best corrosion resistance.

关键词： cryorolling Al 1100 alloy pre-heat treatment nanostructure ultrafine-grain mechanical properties corrosion resistance

Thermal stability of nanocrystalline Al-10Fe-5Cr bulk alloy

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Transactions of Nonferrous Metals Society of China 2019年第2期29卷 242-252页

作者： Muneer BAIG hany R.AMMAR Asiful h.SEIKh Jabair A.MOhAMMED Fahad AL-MUFADI Abdulaziz ALABOODI Engineering Management Department College of Engineering Prince Sultan University Mechanical Engineering Department College of Engineering Qassim University Metallurgical and Materials Engineering Department Faculty of Petroleum and Mining Engineering Suez University Center of Excellence for Research in Engineering Material King Saud University

Thermal stability of nanocrystalline Al-10wt.%Fe-5wt.%Cr bulk alloy was *** initial micro-grained mixture of powders was processed for 100 h using mechanical alloying(MA)to produce nano-grained *** processed powders were sintered using high frequency induction heat sintering(hFIhS).The microstructures of the processed alloy in the form of powders and bulk samples were investigated using XRD,FESEM and *** and compression tests were conducted on the bulk samples for evaluating their mechanical *** evaluate the thermal stability of the bulk samples,they were experimented at 573,623,673 and 723 K under compression load at strain rates of 1×10^-1 and 1×10^-2 s^-*** annealed samples exhibited a significant increase in their microhardness value of 2.65 GPa when being annealed at 723 K,as compared to 2.25 GPa of the as-sintered *** bulk alloy revealed compressive strengths of 520 MPa and 450 MPa at 300 K and 723 K,respectively,when applying a strain rate of 1×10^-1 s^-*** microstructural stability of the bulk alloy was ascribed to the formation of iron and chromium containing phases with Al such as Al6Fe,Al13Fe4 and Al13Cr2,in addition to the supersaturated solid solution(SSSS)of Cr and Fe in Al matrix.

关键词： nanocrystalline Al-Fe-Cr alloy mechanical alloying consolidation thermal stability

Formation of intermetallic phases in unrefined and refined AA6082 Al alloys investigated by using SEM-based ultramicrotomy tomography

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Journal of Materials Science & Technology 2022年第25期120卷 118-128页

作者： J.M.Yu T.hashimoto h.T.Li N.Wanderka Z.Zhang C.Cai X.L.Zhong J.Qin Q.P.Dong h.Nagaumi X.N.Wang Shagang School of Iron and Steel and high-Performance Metal Structural Materials Research Institute Soochow UniversitySuzhou 215137China School of Materials The University of ManchesterSackville StreetManchester M139PLUK Chinalco Materials Application Research Institute Co.Ltd. Beijing 102200China helmholtz-Zentrum Berlin Für Materialien und Energie Hahn-Meitner-Platz 1Berlin 14109Germany Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

The spatial arrangement,distribution and morphology of Fe-bearing intermetallics in AA6082 alloys depends on the manufacturing process of the alloy and thus influences the macroscopic ***,the microstructure of a near industrial scale casting AA6082 Al alloy fabricated by:(a)direct chill casting,(b)Al-5 Ti-1 B grain refiner addition and(c)intensive melt shearing has been investigated by threedimensional visualization using SEM-based serial ultra microtomy *** formation sequence of phases in AA6082 alloys is generally categorized into four stages:formation ofα-Al grains,Fe-bearing intermetallics,Mg_(2)Si phase,and eutectic *** of three-dimensional visualization of the microstructure indicated that TiBparticles not only could nucleate Fe-bearingβ-intermetallics,but also could provide substrate for the formation of Fe-bearingα-intermetallics and Mg_(2)Si.A further deep analysis reveals that the essential condition for the formation of secondary phases such as Fe-bearing intermetallics and Mg_(2)Si phase is the build-up of a supersaturated solute front at theα-Al solid-liquid interface irrespective of the specific nucleation *** addition,the results indicate that grain refinement processing causes the severe interconnectivity of Fe-bearingα-***,the intensive melt shearing is a better manufacturing process because the intermetallics are more evenly distributed and refined than with the addition of the grain refiner,thereby improving the properties of the alloy.

关键词： Al-Si-Mg alloy Grain refinement Al-Fe-Si intermetallic phase Tomography Ultramicrotomy Mg2Si

Formation of Re-containing Carbides in a Second Generation Directionally Solidified Ni Base Superalloy

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Journal of Materials Science & Technology 2009年第3期25卷 361-364页

作者： T. Zhao D. Wang J. Zhang G. Chen L.h. Lou School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The precipitates at grain boundary in a directionally solidified Ni base superalloy after heat treatment, aging at 975℃, and creep rupture test have been characterized. Besides the primary MC carbides and fine particles of u phase, the Re-containing M23C6 was observed. The precipitation kinetics revealed that the formation of M23C6 was associated with the dissolution of u phase and MC carbides. TEM image shows that the continuous precipitation of M23C6 particles effectively hinders the dislocation movement and strengthens the grain boundaries. The high strength of the alloy suggests that M23C6 carbides are beneficial to the properties although Re as an important matrix strengthening element was consumed.

关键词： Ni-base Superalloys Directional solidification Rhenium Carbide