• Nanocrystalline metals prepared by high-energy ball

    01-09-1990· This is a first systematic report on the synthesis of completely nanocrystalline metals by high-energy deformation processes. Pure metals with body-centered cubic (bcc) and hexagonal close-packed (hcp) structures are subjected to ball milling, resulting in a decrease of the average grain size to ≈9 nm for metals with bcc and to ≈13 nm for metals with hcp crystal structures.

    Nanocrystals by high energy ball milling ScienceDirect

    01-05-1992· It has been shown recently that nanocrystalline materials can also be synthesized by high energy ball milling of elemental powders (5,6,7), intermetallic compound powders (5,8,9), or immiscible powders (10,11,12). Fecht et al (6) developed nanocrystalline structures in various elemental bcc and hcp metal powders by ball milling.

    nanocrystalline metals prepared by high energy ball milling

    Nanocrystalline metals prepared by high-energy ball milling Springer. 1 Sep 1990 This is a first systematic report on the synthesis of completely nanocrystalline metals by high-energy

    Preparation of nanocrystalline materials by high-energy

    Materials Science and Engineering A 386 (2004) 442–446 Preparation of nanocrystalline materials by high-energy milling P. Bal´azˇ a,∗,E. Godoˇc´ıkov´aa,L. Kril’ov´aa,P. Lobotkab,E. Gockc a Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04353 Koˇsice, Slovakia b Institute of Electrical Engineering, Slovak Academy of Sciences, D´ubravsk´a cesta 9

    Nanocrystalline Diamond Particles Prepared by High

    In this present work, nanodiamond (ND) particles were successfully prepared from commercial micron diamond powder at room temperature by high energy ball milling process using an oscillatory mill (SPEX8000). The size reduction and structural evolutions of the milled samples were investigated as a function of the milling time by means of X-ray diffraction, and field emission scanning electron

    Hydrogenation of Nanocrystalline Mg2Ni Alloy Prepared by

    Nanocrystalline Mg2Ni powders produced by high energy ball milling (HEBM) were subjected to further severe plastic deformation by cold rolling (CR) or equal-channel angular pressing (ECAP). The microstructure of the alloys have been analysed by the Convolutional whole profile fitting method of the X-ray line profiles. The hydrogenation behavior has been studied by absorption kinetic measurements.

    Atomic-scale structure of nanocrystalline ${\\mathrm{ZrO

    The atomic-scale structure of nanocrystalline ZrO 2 obtained by ball milling has been studied using high-energy x-ray diffraction and the atomic pair distribution function technique. The studies show that, upon relatively short milling times, the parent crystalline material, monoclinic ZrO 2, evolves into a nanocrystalline phase that is locally similar to monoclinic zirconia but shows a cubic

    Nanocrystalline Oxide Ceramics Prepared by High-Energy

    Nanocrystalline Oxide Ceramics Prepared by High-Energy Ball Milling S. Indris,1,2 D. Bork, 1and P. Heitjans Studies of grain size effects in nanocrystalline materials require a preparation

    Nanocrystalline metals prepared by low energy ball milling

    The influence of low energy ball milling on the crystallite size, lattice strain, and storage of deformation energies of elemental metal powders is studied. The formation of nanosized grains (5–25 nm) and enhancement of lattice strain up to 0.4% is found. Excess enthalpies of up to

    Preparation of nanocrystalline materials by high-energy

    Materials Science and Engineering A 386 (2004) 442–446 Preparation of nanocrystalline materials by high-energy milling P. Bal´azˇ a,∗,E. Godoˇc´ıkov´aa,L. Kril’ov´aa,P. Lobotkab,E. Gockc a Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04353 Koˇsice, Slovakia b Institute of Electrical Engineering, Slovak Academy of Sciences, D´ubravsk´a cesta 9

    Nanocrystalline metals prepared by high-energy ball

    This is a first systematic report on the synthesis of completely nanocrystalline metals by high-energy deformation processes. Pure metals with body-centered cubic (bcc) and hexagonal close-packed (hcp) structures are subjected to ball milling, resulting in a decrease of the average grain size to ≈9 nm for metals with bcc and to ≈13 nm for metals with hcp crystal structures.

    High energy ball milling process for nanomaterial synthesis

    For all nanocrystalline materials prepared by high-energy ball milling synthesis route, surface and interface contamination is a major concern. In particular, mechanical attributed contamination by the milling tools (Fe or WC) as well as ambient gas (trace impurities such as O 2,N 2 in rare gases) can be problems for high-energy ball milling.

    Porous Nanocrystalline Alloys Prepared by High Energy

    Porous Nanocrystalline Alloys Prepared by High Energy Ball Milling p.1055 Microstructure Refinement of Cast Intermetallic Alloys A New Application for Nano-Crystalline Powders

    Hydrogenation of Nanocrystalline Mg2Ni Alloy Prepared

    Nanocrystalline Mg2Ni powders produced by high energy ball milling (HEBM) were subjected to further severe plastic deformation by cold rolling (CR) or equal-channel angular pressing (ECAP). The microstructure of the alloys have been analysed by the Convolutional whole profile fitting method of the X-ray line profiles. The hydrogenation behavior has been studied by absorption kinetic measurements.

    On sinterability of nanostructured W produced by high

    Further milling resulted in a high level of WC contamination, which apparently was due to work hardening and the grain refinement of W. A sintered density as high as 97.4% was achieved by sintering cold, isostatically pressed nanocrystalline (8 nm) W powder at 1790 °C for 900 min.

    Nanocrystalline Oxide Ceramics Prepared by High-Energy

    Nanocrystalline Oxide Ceramics Prepared by High-Energy Ball Milling S. Indris,1,2 D. Bork, 1and P. Heitjans Studies of grain size effects in nanocrystalline materials require a preparation

    Nanocrystalline Oxide Ceramics Prepared by High

    We prepared various nanocrystalline ceramics by high-energy ball milling. The investigated systems are the oxide ceramics Li 2 O, LiNbO 3, LiBO 2, B 2 O 3, TiO 2 as monophase materials and the composite material Li 2 O : B 2 O 3. The average grain size was adjusted by variation of the milling time.

    Atomic-scale structure of nanocrystalline ZrO 2 prepared

    The atomic-scale structure of nanocrystalline ZrO 2 obtained by ball milling has been studied using high-energy x-ray diffraction and the atomic pair distribution function technique. The studies show that, upon relatively short milling times, the parent crystalline material, monoclinic ZrO 2,evolves into a nanocrystalline phase that is locally similar to monoclinic zirconia but shows a cubic

    Nanocrystalline metals prepared by low energy ball

    The influence of low energy ball milling on the crystallite size, lattice strain, and storage of deformation energies of elemental metal powders is studied. The formation of nanosized grains (5–25 nm) and enhancement of lattice strain up to 0.4% is found. Excess enthalpies of up to

    Preparation of nanocrystalline materials by high-energy

    Materials Science and Engineering A 386 (2004) 442–446 Preparation of nanocrystalline materials by high-energy milling P. Bal´azˇ a,∗,E. Godoˇc´ıkov´aa,L. Kril’ov´aa,P. Lobotkab,E. Gockc a Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04353 Koˇsice, Slovakia b Institute of Electrical Engineering, Slovak Academy of Sciences, D´ubravsk´a cesta 9

    High energy ball milling process for nanomaterial synthesis

    For all nanocrystalline materials prepared by high-energy ball milling synthesis route, surface and interface contamination is a major concern. In particular, mechanical attributed contamination by the milling tools (Fe or WC) as well as ambient gas (trace impurities such as O 2,N 2 in rare gases) can be problems for high-energy ball milling.

    Porous Nanocrystalline Alloys Prepared by High Energy

    Porous Nanocrystalline Alloys Prepared by High Energy Ball Milling p.1055 Microstructure Refinement of Cast Intermetallic Alloys A New Application for Nano-Crystalline Powders

    Fecht, H.J., Hellstern, E., Fu, Z. and Johnson, W.L. (1990

    Fecht, H.J., Hellstern, E., Fu, Z. and Johnson, W.L. (1990) Nanocrystalline Metals Prepared by High-Energy Ball Milling. Metallurgical and Materials Transactions A

    The thermal stability of nanocrystalline Cu prepared by

    Full density nanocrystalline (NC) Cu with average grain size of 33 nm was prepared through high energy ball milling. Effects of annealing on microhardness and activation volumes (V*) were studied.

    Atomic-scale structure of nanocrystalline ZrO 2 prepared

    The atomic-scale structure of nanocrystalline ZrO 2 obtained by ball milling has been studied using high-energy x-ray diffraction and the atomic pair distribution function technique. The studies show that, upon relatively short milling times, the parent crystalline material, monoclinic ZrO 2,evolves into a nanocrystalline phase that is locally similar to monoclinic zirconia but shows a cubic

    Phonon density of states of nanocrystalline Fe prepared

    We performed inelastic neutron scattering measurements on nanophase Fe powders prepared by high‐energy ball milling. Neutron energy loss spectra were measured for two states of the material: (1) as milled, when the material had a characteristic nanocrystallite size of 12 nm; and (2) annealed, when the material had a characteristic crystallite size of 28 nm.

    Synthesis and properties of nanocrystalline compounds

    Carbides, borides and nitrides of high melting transition metals were synthesized by high energy ball milling of elemental powder mixtures. The obtained hard material phases show a nanocrystalline

    Metals Special Issue : High Energy Ball Milling and

    Nanocrystalline powder of the CoCrFeNiAl high-entropy alloy was produced by high-energy ball milling (HEBM) and consolidated by spark plasma sintering (SPS). Microstructure and crystal structure transformations occurring in the course of HEBM and SPS processes were explored by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and X-Rays Diffraction (XRD)

    Nanocrystalline metals prepared by low energy ball

    The influence of low energy ball milling on the crystallite size, lattice strain, and storage of deformation energies of elemental metal powders is studied. The formation of nanosized grains (5–25 nm) and enhancement of lattice strain up to 0.4% is found. Excess enthalpies of up to

    Atomic-scale structure of nanocrystalline ZrO prepared by

    Atomic-scale structure of nanocrystalline ZrO2 prepared by high-energy ball milling M. Gateshki and V. Petkov* Department of Physics, Central Michigan University, Mt. Pleasant, Michigan 48859, USA G. Williams Department of Biology, Central Michigan University, Mt. Pleasant, Michigan 48859, USA S.

    An Overview of High-energy Ball Milled Nanocrystalline

    This book presents a comprehensive overview of the nanocrystalline Al based alloys as prepared using high-energy ball milling (HEBM). It discusses the influence of HEBM parameters on grain refinement and examines methods for the consolidation of nanocrystalline Al powders; further, it reviews the

    Nanocrystalline ZnO powder prepared by high energy

    Nanocrystalline ZnO powder prepared by high energy ball mill Abstract: We have obtained zinc oxide (ZnO) in the form of nanocrystallites with crystallite sizes from 46 nm to 3 nm by milling 1.4 micron ZnO powders in the high energy ball mill (HEBM) for the different times: 1, 5 and 8 hours.

    Fecht, H.J., Hellstern, E., Fu, Z. and Johnson, W.L. (1990

    Fecht, H.J., Hellstern, E., Fu, Z. and Johnson, W.L. (1990) Nanocrystalline Metals Prepared by High-Energy Ball Milling. Metallurgical and Materials Transactions A

    Transformation of Goethite to Hematite Nanocrystallines

    α -Fe 2 O 3 nanocrystallines were prepared by direct transformation via high energy ball milling treatment for α -FeOOH powder. X-ray diffraction, Rietveld analysis, TEM, and vibrating sample magnetometer (VSM) are used to characterize the samples obtained after several milling times. Phase identification using Rietveld analysis showed that the goethite is transformed to hematite

    Phonon density of states of nanocrystalline Fe prepared by

    Phonon density of states of nanocrystalline Fe prepared by high-energy ball milling B. Fultz California Institute of Technology, mail 138-78, Pasadena, California 91125 J. L. Robertson Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831 T. A. Stephens and L. J. Nagel

    Phonon density of states of nanocrystalline Fe prepared

    13-01-2021· DOI: 10.1063/1.362543 Corpus ID: 17348832. Phonon density of states of nanocrystalline Fe prepared by high‐energy ball milling @article{Fultz1996PhononDO, title={Phonon density of states of nanocrystalline Fe prepared by high‐energy ball milling}, author={B. Fultz and J. D. Robertson and T. A. Stephens and L. Nagel and S. Spooner}, journal={Journal of Applied Physics}, year={1996},

    Metals Special Issue : High Energy Ball Milling and

    Nanocrystalline powder of the CoCrFeNiAl high-entropy alloy was produced by high-energy ball milling (HEBM) and consolidated by spark plasma sintering (SPS). Microstructure and crystal structure transformations occurring in the course of HEBM and SPS processes were explored by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and X-Rays Diffraction (XRD)

    Li Conductivity of Nanocrystalline Li4Ti5O12 Prepared by

    Li Conductivity of Nanocrystalline Li4Ti5O12 Prepared by a Sol-Gel Method and High-Energy Ball Milling. In DIFFUSION IN MATERIALS DIMAT2008 (Vol. 289-292, pp. 565-+).

    Contamination Effects on Improving the Hydrogenation

    Abstract: Ultrafine MgH2 nanocrystalline powders were prepared by reactive ball milling of elemental Mg powders after 200 h of high-energy ball milling under a hydrogen gas pressure of 50 bar. The as-prepared metal hydride powders were contaminated with 2.2 wt. % of FeCr-stainless

 

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