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Textures and microstructures 6건

  1. [해외논문]   X-Ray Diffraction Method for Determination of Texture Evolution in Layers  

    Tomov, I. (Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1040, Bulgaria ) , Banova, R. (Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1040, Bulgaria ) , Surnev, S. (Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1040, Bulgaria)
    Textures and microstructures v.19 no.4 ,pp. 189 - 196 , 1992 , 0730-3300 ,

    초록

    An X-ray diffraction method for the determination of texture evolution in electrodeposited and vapour-deposited layers was developed. It was applied to the study of the texture of electrodeposited bright zinc. It was established that the arising of texture in the concrete models is due to oriented nucleation as well as to a growth selection process. The substrate structure also has an effect on the character of the texture evolution.

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  2. [해외논문]   “Normal” Orientation Distributions  

    Schaeben, H. (Laboratory of Metallurgy of Polycrystalline Materials (LM2P), University of Metz, ile du Saulcy, Metz–Cedex 01 57045, France)
    Textures and microstructures v.19 no.4 ,pp. 197 - 202 , 1992 , 0730-3300 ,

    초록

    Analogues of the normal distribution in Euclidean space for orientations represented by Rodrigues parameters are discussed. It is emphasized that different characterizations of the normal distribution in Euclidean space lead to different distributions in other spaces, none of which is mathematically superior to any other one. Particular analogues of the normal distribution are the Bingham distribution on S+4 for the purposes of mathematical statistics, and the Brownian motion distribution on S+4 in terms of probability theory and stochastic processes. It is reminded of the fact that a simple analogue of the central limit theorem in Euclidean space does not exist for the hyperspheres SP and projective hyperplanes HP−1 S+4.

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  3. [해외논문]   Determination of Preferred Orientation of Pyrite in a Chalcopyrite Ore by Means of Neutron Diffraction  

    Jansen, E. M. (Institut für Mineralogie und Lagerstättenlehre, RWTH Aachen, Aachen 5100, Germany ) , Merz, P. (Mineralogisches Institut, Universität Bonn, Außenstelle Forschungszentrum Jülich (KFA), Jülich 5170, Germany ) , Schaeben, H. (Laboratoire de Metallurgie des Materiaux Polycristallins (LM2P), Universite de Metz, Metz 57045, France ) , Schä (Mineralogisches Institut, Universität Bonn, Außenstelle Forschungszentrum Jülich (KFA), Jülich 5170, Germany ) , fer, W. (Institut für Mineralogie und Lagerstättenlehre, RWTH Aachen, Aachen 5100, Germany ) , Siemes, H. (Mineralogisches Institut, Universität Bonn, Außenstelle Forschungszentrum Jülich (KFA), Jülich 5170, Germany) , Will, G.
    Textures and microstructures v.19 no.4 ,pp. 203 - 210 , 1992 , 0730-3300 ,

    초록

    Analogues of the normal distribution in Euclidean space for orientations represented by Rodrigues parameters are discussed. It is emphasized that different characterizations of the normal distribution in Euclidean space lead to different distributions in other spaces, none of which is mathematically superior to any other one. Particular analogues of the normal distribution are the Bingham distribution on S+4 for the purposes of mathematical statistics, and the Brownian motion distribution on S+4 in terms of probability theory and stochastic processes. It is reminded of the fact that a simple analogue of the central limit theorem in Euclidean space does not exist for the hyperspheres SP and projective hyperplanes HP−1 S+4.

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  4. [해외논문]   Modelling High Temperature Rolling Textures of FCC Metals  

    Maurice, Cl. (CRV SA, BP 27, 38340 Voreppe, France ) , Driver, J. H. (Ecole des Mines, Département Matériaux, 158 Cours Fauriel, Saint-Etienne Cedex 2 42023, France ) , Tó (Institute for General Physics, Eötvös University, P.O.B. 323, Budapest 1445, Hungary) , th, L. S.
    Textures and microstructures v.19 no.4 ,pp. 211 - 227 , 1992 , 0730-3300 ,

    초록

    A partially relaxed constraints grain deformation model is proposed to explain the influence of temperature on the rolling textures of fcc metals. The effects of the grain plastic shear in the TD/RD plane and the role of the rate sensitivity of crystallographic slip on the evolution of the texture have been investigated by numerical simulations for a random initial texture. The rate sensitivity and the TD/RD shear are assumed to increase with temperature. The progression from the Copper {112} component towards Brass {110} and S {123} type textures is predicted at higher values of the rate sensitivity and the TD/RD shear. These model predictions compare well with published hot rolling textures of aluminium alloys. The concept of grain shear partial relaxation has been validated by room and high temperature channel die tests on {110} oriented Al crystals constrained between aluminium polycrystals.

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  5. [해외논문]   Discretization Techniques for Orientation Distribution Functions  

    Tó (Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, de Croylan 2, Heverlee 3001, Belgium ) , th, Lá (Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, de Croylan 2, Heverlee 3001, Belgium) , szló , S. , Van Houtte, Paul
    Textures and microstructures v.19 no.4 ,pp. 229 - 244 , 1992 , 0730-3300 ,

    초록

    Two methods for the discrete orientation representation of continuous orentation distribution functions (ODFs) are presented. The first one is based on the cumulative ODF, while the second one uses a minimum orientation distance criterion. The properties of these new techniques are discussed and contrasted with each other as well as with an earlier method which is based on cutting below certain limiting intensity. Four kinds of tests have been carried out on these techniques: i. their performance in reproducing the ODF, ii. prediction of physical parameters, as R and M values, iii. deformation texture predictions, iv. rediscretizations during deformation texture modelling. The results of these tests show the good applicability of the proposed two new discretization techniques for approximating the ODF, to calculate physical parameters and for deformation texture modelling, even at relatively low number of orientations. The cutting technique, however, found to be unprecise, even at large number of orientations. On the basis of the results obtained during the rediscretization tests, a new technique for modelling twinning in deformation texture codes has been proposed.

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  6. [해외논문]   Texture Development and Length Changes in Copper Bars Subjected to Free End Torsion  

    Tó (Institute for General Physics, Eötvös University, P.O. Box 323, Budapest 1445, Hungary ) , th, L. S. (Metallurgical Engineering, McGill University, 3450 University St., Montreal H3A 2A 7, Canada ) , Jonas, J. J. (Metallurgical Engineering, McGill University, 3450 University St., Montreal H3A 2A 7, Canada ) , Daniel, D. (Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, N.C. 27695, USA) , Bailey, J. A.
    Textures and microstructures v.19 no.4 ,pp. 245 - 262 , 1992 , 0730-3300 ,

    초록

    Free-end torsion tests were carried out on polycrystalline copper samples at room temperature, 125°C, 200°C and 300°C. The lengths of the samples increased at room temperature and 125°C, but increased and then decreased at 200°C and 300°C. Pole figures were measured on these samples at increasing shear strains up to γ= 11. ODF's were calculated from the pole figures, which enabled the texture development at the two higher temperatures to be distinguished from that observed at the two lower temperatures. Analysis of these ODF's indicates that the low temperature torsion textures are entirely attributable to dislocation glide and can be predicted by means of the conventional texture development programs of crystal plasticity. By contrast, the high temperature textures display evidence for dynamic recrystallization, the occurrence of which seems to be responsible for the shortening. Dynamic recrystallization removes the {100} or C component and strengthens the rotated cube and the 111 or A components.

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