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Phonon broadening in high entropy alloys

npj Computational Materials 2017年第1期3卷 154-162页

作者： Fritz Kormann Yuji Ikeda Blazej Grabowski Marcel H.F.Sluiter Materials Science and Engineering Delft University of Technology2628 CD DelftThe Netherlands Center for Elements Strategy Initiative for Structural Materials Kyoto UniversityKyoto 606-8501Japan Computationals Materials Design Max-Planck-Institut fur Eisenforschung GmbH40237 DusseldorfGermany

Refractory high entropy alloys feature outstanding properties making them a promising materials class for next-generation hightemperature *** high temperatures,materials properties are strongly affected by lattice vibrations(phonons).Phonons critically influence thermal stability,thermodynamic and elastic properties,as well as thermal *** contrast to perfect crystals and ordered alloys,the inherently present mass and force constant fluctuations in multi-component random alloys(high entropy alloys)can induce significant phonon scattering and *** their importance,phonon scattering and broadening have so far only scarcely been investigated for high entropy *** tackle this challenge from a theoretical perspective and employ ab initio calculations to systematically study the impact of force constant and mass fluctuations on the phonon spectral functions of 12 body-centered cubic random alloys,from binaries up to 5-component high entropy alloys,addressing the key question of how chemical complexity impacts *** find that it is crucial to include both mass and force constant *** one or the other is neglected,qualitatively wrong results can be obtained such as artificial phonon band *** analyze how the results obtained for the phonons translate into thermodynamically integrated quantities,specifically the vibrational *** in the vibrational entropy with increasing the number of elements can be as large as changes in the configurational entropy and are thus important for phase stability *** set of studied alloys includes MoTa,MoTaNb,MoTaNbW,MoTaNbWV,VW,VWNb,VWTa,VWNbTa,VTaNbTi,VWNbTaTi,HfZrNb,HfMoTaTiZr.

关键词： alloys entropy high

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Probe manipulators for Wendelstein 7-X and their interaction with the magnetic topology

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Plasma Science and Technology 2018年第5期20卷 6-17页

作者： M RACK D HOSCHEN D REITER B UNTERBERG J W COENEN S BREZINSEK O NEUBAUER S BOZHENKOV G CZYMEK Y LIANG M HUBENY Ch LINSMEIER the Wendelstein 7-X Team Forschungszentrum Julich gmbh Institut für Energie- und Klimaforschung-Plasmaphysik Partner of the Trilateral Euregio Cluster (TEC) D-52425 Julich Germany JARA-HPC D-52425 Julich Germany Max-Planck-Institut für Plasmaphysik D-17491 Greifswald/D-85748 Garching Germany

Probe manipulators are a versatile addition to typical plasma edge *** with material samples they allow for detailed investigation of plasma–wall interaction processes,such as material erosion,deposition or impurity transport *** combined with electrical probes,a study of scrape-off layer and plasma edge density,temperature and flow profiles as well as magnetic topologies is possible.A mid-plane manipulator is already in operation on Wendelstein 7-X.A system in the divertor region is currently under *** the present paper we discuss the critical issue of heat and power loads,power redistribution and experimental access to the complex magnetic topology of Wendelstein *** the aforementioned aspects are of relevance for the design and operation of a probe manipulator in a device like Wendelstein？7-X.A focus is put on the topological region that is accessible for the different coil current configurations at Wendelstein 7-X and the power load on the manipulator with respect to the resulting different magnetic *** analysis of power loads on plasma-facing components is performed using a numerical tracer particle diffusion tool provided via the Wendelstein 7-X Webservices.

关键词： stellarators Wendelstein 7-X manipulator divertor power load

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FELUWA Hose Diaphragm Piston Pumps for Abrasive,Aggressive ＆ Toxic Media and Coal Gasificaiton

FELUWA Hose Diaphragm Piston Pumps for Abrasive,Aggressive ...

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第六届化学工程与生物技术展览暨会议

作者： HeinzM.Ngel FELUWA Pumpen gmbh Beulertweg D-54570 Murlenbach

＜正＞ Safety, availability （MTBF, MTBR） and reliability are decisive criteria for the choice ofthe optimum *** trends within the pumps’ industry are at present coming down to cost reduction as a ***, strategies to...

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Element mapping the Merensky Reef of the Bushveld Complex

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Geoscience Frontiers 2021年第3期12卷 259-278页

作者： William Smith Wolfgang Maier Stephen Barnes Gareth Moorhead David Reid Bartosz Karykowski School of Earth and Ocean Sciences Cardiff UniversityCardiff CF240DEUnited Kingdom CSIRO Mineral Resources Perth 6160Australia CSIRO ClaytonVictoriaAustralia University of Cape Town South Africa Fugro Germany Land gmbh 12555 BerlinGermany

The Merensky Reef hosts one of the largest PGE resources *** has been exploited for nearly 100 years,yet its origin remains *** the present study,we characterised eight samples of the reef at four localities in the western Bushveld Complex using micro-X-ray fluorescence and field emission scanning electron *** results indicate that the Merensky Reef formed through a range of diverse *** exhibited by chromite grains at the base of the reef are consistent with supercooling and in situ *** local thickening of the Merensky chromitite layers within troughs in the floor rocks is most readily explained by granular *** and deformation textures in pyroxenes of the Merensky pegmatoid bear testament to recrystallisation and *** footwall rocks to the reef contain disseminations of PGE rich sulphides as well as olivine grains with peritectic reaction rims along their upper margins suggesting reactive downward flow of silicate and sulphide ***-hosted melt inclusions containing Cl-rich apatite,sodic plagioclase,and phlogopite suggest the presence of highly evolved,volatile-rich *** reverse zonation of cumulus plagioclase in the footwall of the reef indicates dissolution or partial melting of plagioclase,possibly triggered by flux of heat,acidic fluids,or hydrous ***,these data suggest that the reef formed through a combination of magmatic,hydrodynamic and hydromagmatic processes.

关键词： Merensky Reef Bushveld Complex Magmatic sulphide Platinum-group elements PGE Anorthosite

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A small electron beam ion trap/source facility for electron/neutral-ion collisional spectroscopy in astrophysical plasmas

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Research in Astronomy and Astrophysics 2018年第1期18卷 1-10页

作者： Gui-Yun Liang Hui-Gang Wei Da-Wei Yuan Fei-Lu Wang Ji-Min Peng Jia-Yong Zhong Xiao-Long Zhu Mike Schmidt Günter Zschornack Xin-Wen Ma Gang Zhao Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China Department of Astronomy Beijing Normal University Beijing 100875 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China DREEBIT gmbh 01109 Dresden Germany

Spectra are fundamental observation data used for astronomical research,but understanding them strongly depends on theoretical models with many fundamental parameters from theoretical *** models give different insights for understanding a specific ***,laboratory benchmarks for these theoretical models become *** electron beam ion trap is an ideal facility for spectroscopic benchmarks due to its similar conditions of electron density and temperature compared to astrophysical plasmas in stellar coronae,supernova remnants and so *** this paper,we will describe the performance of a small electron beam ion trap/source facility installed at National Astronomical Observatories,Chinese Academy of *** present some preliminary experimental results on X-ray emission,ion production,the ionization process of trapped ions as well as the effects of charge exchange on the ionization.

关键词： X-ray:general atomic processes line:formation method:laboratory:atomic

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Broadband Frequency Comb for Calibration of Astronomical Spectrographs

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Journal of Applied Mathematics and Physics 2016年第2期4卷 202-205页

作者： Pu Zou Tilo Steinmetz Armin Falkenburger Yuanjie Wu Lingtong Fu Michael Mei Ronald Holzwarth Menlo Systems gmbh Am Klopferspitz 19a 82152 Martinsried Germany

We present our state-of-the-art version of a frequency comb for calibration of astronomical spectrographs. The mode spacing of the frequency comb can be designed to match the resolution of a spectrograph. Combined with its excellent accuracy and stability, the spectral coverage of more than 70% of the whole visible spectrum range makes the frequency comb an ideal calibration source. In addition, the new version introduces the automatic start-up function that brings convenience to the astronomers.

关键词： Frequency Combs Astronomical Spectrograph Calibration

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用常规强度试样与粉末冶金零件测定的力学性能的比较

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粉末冶金技术 2013年第3期31卷 229-234页

作者： LorenzS.Sigl Patrice Delarbre Ulrike Jehring 韩凤麟 Sinterstahl gmbh 87629 Füssen Germany Technical University Dresden 01217 Dresden Germany

由于零件的强度难以试验测定,因此通常都不使用这些数据。这篇论文介绍了一种可直接测定零件强度的新方法。这种方法是采用水射流切割(Water-jet Cutting),从零件上切割小型矩形试棒(尺寸约为40mm×5mm×5mm),经磨加工制备成试棒,用于... 详细信息

由于零件的强度难以试验测定,因此通常都不使用这些数据。这篇论文介绍了一种可直接测定零件强度的新方法。这种方法是采用水射流切割(Water-jet Cutting),从零件上切割小型矩形试棒(尺寸约为40mm×5mm×5mm),经磨加工制备成试棒,用于测定力学性能。这篇论文将由高合金化Fe(Mo)-Ni-Cu粉末冶金钢制造的同步器齿毂作为典型零件,用由其上切割制成的矩形试棒测定了抗拉强度、冲击强度与三点弯曲的横向断裂强度,并将其和用常规拉伸试样(DIN EN ISO 2740)测定的强度与冲击性能进行了比较。由零件试棒和常规试样测定的性能完全一致,都在试验误差范围之内。为证明比较的有效性,还通过全面的化学与显微组织鉴定,对两种试样的相似性进行了核实。采用新方法评定了生产工艺变量对同步器齿毂的力学性能的影响。建立了小拉伸试棒的横向断裂强度与抗拉强度之间的相互关系。

关键词：力学性能硬度拉伸性能横向断裂强度

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Multiphase-field simulation of austenite reversion in medium-Mn steels

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International Journal of Minerals,Metallurgy and Materials 2021年第5期28卷 847-853页

作者： Yan Ma Rui Zheng Ziyuan Gao Ulrich Krupp Hai-wen Luo Wenwen Song olfgang Bleck Steel Institute(IEHK) RWTH Aachen UniversityIntzestraße 152072 AachenGermany Department of Ferrous Metallurgy University of Science and Technology BeijingBeijing 100083China Max-Planck-Institut für Eisenforschung gmbh(MPIE) Max-Planck-Straße 140237 DüsseldorfGermany

Medium-Mn steels have attracted immense attention for automotive applications owing to their outstanding combination of high strength and superior *** steel class is generally characterized by an ultrafine-grained duplex microstructure consisting of ferrite and a large amount of *** a unique microstructure is processed by intercritical annealing,where austenite reversion occurs in a fine martensitic *** the present study,austenite reversion in a medium-Mn alloy was simulated by the multiphase-field approach using the commercial software MICRESS®coupled with the thermodynamic database TCFE8 and the kinetic database *** particular,a faceted anisotropy model was incorporated to replicate the lamellar morphology of reversed *** simulated microstructural morphology and phase transformation kinetics(indicated by the amount of phase)concurred well with experimental observations by scanning electron microscopy and in situ synchrotron high-energy X-ray diffraction,respectively.

关键词： medium-Mn steels intercritical annealing austenite reversion phase-field simulation faceted anisotropy model

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The Effects of Nanoparticle Additives on Thermophysical Properties of Concrete Mixtures

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Open Journal of Civil Engineering 2022年第4期12卷 587-614页

作者： Kamran Rahmati Shadbad Ali Foroughi-Asl Siamak Talatahari Sassan Mohasseb Faculty of Civil Engineering University of Tabriz Tabriz Iran ETH SMTEAM GmbH Meilen Switzerland

In recent years, energy-retrofitting is becoming an imperative aim for existing buildings worldwide and increased interest has focused on the development of nanoparticle blended concretes with adequate mechanical properties and durability performance, through the optimization of concrete permeability and the incorporation of the proper nanoparticle type in the concrete matrix. In order to investigate the potential use of nanocomposites as dense barriers against the permeation of liquids into the concrete, three types of nanoparticles including Zinc Oxide (ZnO), Magnesium Oxide (MgO), and composite nanoparticles were used in the present study as partial replacement of cement. Besides, the effect of adding these nanoparticles on both pore structure and mechanical strengths of the concrete at different ages was determined, and scanning electron microscopy (SEM) images were then used to illustrate the uniformity dispersion of nanoparticles in cement paste. It was demonstrated that the addition of a small number of nanoparticles effectively enhances the mechanical properties of concrete and consequently reduces the extent of the water permeation front. Finally, the behavioral models using Genetic Algorithm (GA) programming were developed to describe the time-dependent behavioral characteristics of nanoparticle blended concrete samples in various compressive and tensile stress states at different ages.

关键词： Nanoparticle Blended Concretes Zinc Oxide (ZnO) Magnesium Oxide (MgO) Composite Nanoparticles Genetic Algorithm (GA) Programming Time-Dependent Behavioral Model

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Dimensioning Wavelength-Routed Multi-Fiber WDM Networks with Limited Number of Wavelength Converters

Dimensioning Wavelength-Routed Multi-Fiber WDM Networks with...

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The 19th International Teletraffic Congress-ITC19

作者： Franz Hartleb Ruth Kleinewillinghfer-Kopp T-Systems International gmbh Postfach 200253 64301 DarmstadtGermany T-Systems International gmbh Postfach 200253 64301 DarmstadtGermany

＜正＞Sparse-partial wavelength conversion in WDM networks has been shown as a very efficient network architecture. We present a network analysis and network dimensioning approach for stochastic path requests based on a reduced load approximation. This model enables us to dimension the number of WDM-systems per link and the number of wavelength converters per node needed to guarantee a maximum blocking probability for a given traffic matrix. The key feature of our approach is that the traffic dynamic is one of the free model parameters. This allows us to model the wide range between static traffic and Poisson traffic. A numerical example shows how the dimensioning result depends on the traffic dynamic.

关键词： Network dimensioning multi-fiber WDM network stochastic wavelength path requests wavelength continuity constraint share per node wavelength converter model.

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