The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform

Tatsuo Izumitani - One of the best experts on this subject based on the ideXlab platform.

  • Memory Effect on Spinodal Decomposition. 1. Effect of Uniaxial Compression
    Macromolecules, 1996
    Co-Authors: Takeji Hashimoto, Tatsuo Izumitani
    Abstract:

    Effects of a uniaxial Compression on the phase-separation process of a binary mixture of poly(styrene-ran-butadiene) (SBR) and polybutadiene (PB) were studied by means of time-resolved light scattering. For this purpose, the uniaxial Compression of γp = 1 to 0.25 was imposed on the film which was first subjected to isothermal phase separation in the absence of external deformations. The scattering intensity distributions were detected as a function of scattering vector q in the plane perpendicular to the Compression Axis with the incident beam parallel to the Compression Axis. After the Compression, the scattering vector at a maximum intensity qm(γp) abruptly decreased with γp nearly in accord with affine deformation. In an earlier time after the Compression, the peak scattering vector qm(t;γp) remained unchanged with time t for a certain time period and then decreased in the same manner as that found for the phase separation in the undeformed sample, indicating that a memory effect of the uniaxial compre...

Takeji Hashimoto - One of the best experts on this subject based on the ideXlab platform.

  • Memory Effect on Spinodal Decomposition. 1. Effect of Uniaxial Compression
    Macromolecules, 1996
    Co-Authors: Takeji Hashimoto, Tatsuo Izumitani
    Abstract:

    Effects of a uniaxial Compression on the phase-separation process of a binary mixture of poly(styrene-ran-butadiene) (SBR) and polybutadiene (PB) were studied by means of time-resolved light scattering. For this purpose, the uniaxial Compression of γp = 1 to 0.25 was imposed on the film which was first subjected to isothermal phase separation in the absence of external deformations. The scattering intensity distributions were detected as a function of scattering vector q in the plane perpendicular to the Compression Axis with the incident beam parallel to the Compression Axis. After the Compression, the scattering vector at a maximum intensity qm(γp) abruptly decreased with γp nearly in accord with affine deformation. In an earlier time after the Compression, the peak scattering vector qm(t;γp) remained unchanged with time t for a certain time period and then decreased in the same manner as that found for the phase separation in the undeformed sample, indicating that a memory effect of the uniaxial compre...

  • Computational study of effects of uniaxial Compression during processes of spinodal decomposition.
    Physical review. E Statistical physics plasmas fluids and related interdisciplinary topics, 1995
    Co-Authors: Mikihito Takenaka, Takeji Hashimoto, Toshihiro Kawakatsu, Kyozi Kawasaki
    Abstract:

    We present a computational study on the effects of a uniaxial Compression with Compression ratio 2 on the ordering processes via spinodal decomposition (SD), by numerically integrating the timedependent Ginzburg-Landau equation. We investigate the pattern growth and two-dimensional structure factors both after a Compression in the intermediate stage SD and after a Compression in the late stage SD. The results indicate that the Compression in the intermediate stage SD causes the phase-separated structure to orient with its interfaces in the direction parallel to the Compression Axis, and that the Compression in the late stage SD causes the phase-separated structure to orient with its interfaces in the direction perpendicular to the Compression Axis.

Haruyuki Inui - One of the best experts on this subject based on the ideXlab platform.

  • Deformation twinning in single crystals of a D019 compound with an off-stoichiometric composition (Ti–36.5at.%Al)
    Acta Materialia, 2004
    Co-Authors: Kyosuke Kishida, Y. Takahama, Haruyuki Inui
    Abstract:

    Abstract The characteristics of deformation twinning in single crystals of a D019 compound Ti3Al with off-stoichiometric composition (Ti–36.5at.%Al) have been studied in detail by trace analysis and transmission electron microscopy. Deformation twinning is operative only at high temperatures above 1000 °C when the Compression Axis is parallel to and close to the hexagonal c-Axis. All observed deformation twins are assigned to be of the type II and the twinning elements are determined as: K 1 : ‘ { 2 ¯ 12 10 ¯ 3 } ’ , K 2 : { 2 0 2 ¯ 1 ¯ } , η 1 : 〈 5 1 ¯ 4 ¯ 6 ¯ 〉 , η 2 : ‘ 〈 1 ¯ 3 2 ¯ 2 〉 ’ , s = 0.346 . The critical resolved shear stress for the ‘ { 2 ¯ 12 10 ¯ 3 } ’ twin is estimated to be about 50 MPa at 1000 °C and it gradually decreases with increasing temperature. The possible atom movements by the deformation twinning are described and the reasons why twinning of this type occurs only under a limited condition (i.e., off-stoichiometric compositions, high temperatures and Compression Axis being close to the c-Axis) are discussed in the light of the atom movements by the deformation twinning.

V. A. Starenchenko - One of the best experts on this subject based on the ideXlab platform.

  • Structure of Ni 3 Al Single Crystal after Severe Plastic Deformation
    Optoelectronics Instrumentation and Data Processing, 2019
    Co-Authors: O. A. Kuts, S. V. Starenchenko, V. A. Starenchenko, Yu. V. Solov’eva, V. P. Pilyugin, A. I. Ancharov
    Abstract:

    Synchrotron X-ray diffraction study of L12 ordered Ni3Al single crystals was performed. The ultrafine-grained structure resulting from severe plastic deformation was studied. In the initial state, the ordered single crystal is oriented along the [211] Compression Axis. Along with the ordered phase, there is a small fraction of disordered crystal oriented along the [100] Axis. Compression of the samples and subsequent torsion at different angles led to disturbance of the single crystallinity of the sample and a change in the state of the atomic order up to the disappearance of the L12 superstructure.

  • Structure of Ni_3Al Single Crystal after Severe Plastic Deformation
    Optoelectronics Instrumentation and Data Processing, 2019
    Co-Authors: O. A. Kuts, S. V. Starenchenko, V. A. Starenchenko, Yu. V. Solov’eva, V. P. Pilyugin, A. I. Ancharov
    Abstract:

    Synchrotron X-ray diffraction study of L1_2 ordered Ni_3Al single crystals was performed. The ultrafine-grained structure resulting from severe plastic deformation was studied. In the initial state, the ordered single crystal is oriented along the [211] Compression Axis. Along with the ordered phase, there is a small fraction of disordered crystal oriented along the [100] Axis. Compression of the samples and subsequent torsion at different angles led to disturbance of the single crystallinity of the sample and a change in the state of the atomic order up to the disappearance of the L1_2 superstructure.

  • cottrell stokes law for ni3ge intermetallic single crystals with the overline 2 3 4 Compression Axis
    Russian Physics Journal, 2015
    Co-Authors: Yu V Soloveva, A N Solovev, M V Gettinger, S. V. Starenchenko, V. A. Starenchenko
    Abstract:

    In an experiment on the temperature variation during plastic deformation of Ni3Ge alloy single crystals with the [ $$ \overline{2} $$ 3 4] orientation of the deformation Axis, a dependence of the stress jump on the applied stress is investigated. It is elucidated that under conditions of cubic slip, the dependence is linear and is similar to that observed for pure metals (the Cottrell−Stokes law). The anomalous temperature dependence of the flow stress during cubic slip is confirmed in experiments on the variation of the deformation temperature.

  • Cottrell−Stokes Law for Ni3Ge Intermetallic Single Crystals with the [$$ \overline{2} $$ 3 4] Compression Axis
    Russian Physics Journal, 2015
    Co-Authors: Yu. V. Solov’eva, M V Gettinger, S. V. Starenchenko, A. N. Solov’ev, V. A. Starenchenko
    Abstract:

    In an experiment on the temperature variation during plastic deformation of Ni3Ge alloy single crystals with the [ $$ \overline{2} $$ 3 4] orientation of the deformation Axis, a dependence of the stress jump on the applied stress is investigated. It is elucidated that under conditions of cubic slip, the dependence is linear and is similar to that observed for pure metals (the Cottrell−Stokes law). The anomalous temperature dependence of the flow stress during cubic slip is confirmed in experiments on the variation of the deformation temperature.

  • Cottrell−Stokes Law for Ni3Ge Intermetallic Single Crystals with the [2¯ 3 4] Compression Axis
    Russian Physics Journal, 2015
    Co-Authors: Yu. V. Solov’eva, M V Gettinger, S. V. Starenchenko, V. A. Starenchenko, A. N. Solov’ev, K. M. Rae
    Abstract:

    In an experiment on the temperature variation during plastic deformation of Ni3Ge alloy single crystals with the [ $$ \overline{2} $$ 3 4] orientation of the deformation Axis, a dependence of the stress jump on the applied stress is investigated. It is elucidated that under conditions of cubic slip, the dependence is linear and is similar to that observed for pure metals (the Cottrell−Stokes law). The anomalous temperature dependence of the flow stress during cubic slip is confirmed in experiments on the variation of the deformation temperature.

Antoine Rouilly - One of the best experts on this subject based on the ideXlab platform.

  • Cellulose consolidation under high-pressure and high-temperature uniaxial Compression
    Cellulose, 2019
    Co-Authors: Thibaud Pintiaux, Maelie Heuls, Virginie Vandenbossche, Timothy Murphy, Richard Wuhrer, Patrice Castignolles, Marianne Gaborieau, Antoine Rouilly
    Abstract:

    Materials based on cellulose cannot be obtained from thermoplastic processes. Our aim is to prepare all-cellulose materials by uniaxial high pressure thermoCompression of cellulose. The effect of moisture content (0–8 w/w%) and temperature (175–250 °C) was characterized through the mechanical properties (bending and tensile), morphology (scanning electron microscopy, X-ray tomography) and microstructure (viscometric degree of polymerization, Raman spectroscopy, X-ray diffraction, solid-state NMR) of the specimens. The specimens were mechanically stronger in bending than in tension. They exhibited a more porous heart, a dense but very thin skin on the faces (orthogonal to the Compression Axis) and thick and extremely dense sides. During thermoCompression severe friction between fibers caused a decrease in molecular weight while heating above the glass transition temperature was responsible for water migration towards the specimen heart. Most of the cohesion came from the small sides of the test samples (parallel to the Compression Axis) and seemed mainly related to the entanglement of amorphized cellulose at the interface between particles. Around 200 °C water accumulated and provoked delamination upon pressure release, but at higher temperatures water, in a subcritical state, may have been consumed during the hydrolysis of amorphous cellulose regions. The all-cellulose material with the best mechanical properties was obtained at 2% moisture and 250 °C. This work shows that thermoCompression at high temperature with limited moisture may be viable to produce renewable, sustainable all-cellulose materials for application in biobased plastic substitutes including binderless boards. Graphical abstract