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  • 1
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    Orientation-dependent recrystallization in an oxide dispersion strengthened steel after dynamic plastic deformation (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-08-08
    Description: The microstructure of the oxide dispersion strengthened ferritic steel PM2000 has been investigated after compression by dynamic plastic deformation to a strain of 2.1 and after subsequent annealing at 715 ?C. Nanoscale lamellae, exhibiting a strong ?100? + ?111? duplex fibre texture, form during dynamic plastic deformation. Different boundary spacings and different stored energy densities for regions belonging to either of the two fibre texture components result in a quite heterogeneous deformation microstructure. Upon annealing, preferential recovery and preferential nucleation of recrystallization are found in the ?111?- oriented lamellae, which had a higher stored energy density in the as-deformed condition. In the course of recrystallization, the initial duplex fibre texture is replaced by a strong ?111? fibre recrystallization texture.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 2
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    Effects of structural heterogeneity of nanostructured copper on the evolution of the sizes of recrystallized grains during annealing (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-08-08
    Description: Recrystallization in copper deformed by dynamic plastic deformation was investigated using electron backscatter diffraction. The recrystallized grains show a broad size distribution. The kinetics of grains of different sizes is observed to be different: In the beginning of recrystallization, the area fraction of small recrystallized grains increases rapidly. At later stages of recrystallization, the area fraction of small recrystallized grains is stable, while the area fractions of medium and large recrystallized grains increase. Correlation between the broad grain size distribution (and its evolution) and the heterogeneous deformed microstructure is discussed.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 3
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    Kinetics of individual grains during recrystallization of cold-rolled copper (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-04-26
    Description: The formation of a recrystallization texture is closely related to the nucleation and growth of recrystallizing grains, which may vary from grain to grain. Cube texture is a commonly observed recrystallization texture in face centered cubic metals of medium to high stacking fault energy after heavy cold-rolling and annealing. In this work, recrystallization of pure copper cold-rolled to a von Mises strain of 2.7 was investigated in situ using three-dimensional X-ray diffraction. Growth curves of 835 grains were determined, and the curves of cube and noncube grains were compared. It was found that the nucleation times of cube grains and non-cube grains were similar, whereas the growth rates of a few but not all cube grains were high. Effects hereof for the development of the cube texture were discussed.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 4
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    Dark-field X-ray microscopy for multiscale structural characterization (2015)
    Springer Nature
    Details
    Publication Date: 2015-01-16
    Description: Article The internal structure of materials determines many of their physical and mechanical properties. Here, the authors have developed a non-destructive X-ray microscopy technique for layer-by-layer mapping of crystallographic orientations and stresses to obtain a three-dimensional reconstruction of a material. Nature Communications doi: 10.1038/ncomms7098 Authors: H. Simons, A. King, W. Ludwig, C. Detlefs, W. Pantleon, S. Schmidt, I. Snigireva, A. Snigirev, H. F. Poulsen
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 5
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    Nanoscale lamellae in an oxide dispersion strengthened steel processed by dynamic plastic deformation (2014)
    Institute of Physics (IOP)
    Details
    Publication Date: 2014-08-09
    Description: The microstructure of an oxide dispersion strengthened ferritic PM2000 steel with a strong initial (100) texture has been investigated after compression by dynamic plastic deformation (DPD) at room temperature to a strain of 2.1. Measurements using electron backscatter diffraction and transmission electron microscopy indicate that DPD along the (100) direction results in a lamellar-type microstructure, in which lamellae of the (100) orientation alternate with (111) lamellae. These lamellae have a common rotation (110) axis in the compression plane. The microstructure is quite heterogeneous, where regions containing very narrow lamellae (with (111) lamellae as narrow as 20-40 nm) and regions of comparatively broad lamellae are found.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 6
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    Formation and subdivision of deformation structures during plastic deformation (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-05-13
    Description: During plastic deformation of metals and alloys, dislocations arrange in ordered patterns. How and when these self-organization processes take place have remained elusive, because in situ observations have not been feasible. We present an x-ray diffraction method that provided data on the dynamics of individual, deeply embedded dislocation structures. During tensile deformation of pure copper, dislocation-free regions were identified. They showed an unexpected intermittent dynamics, for example, appearing and disappearing with proceeding deformation and even displaying transient splitting behavior. Insight into these processes is relevant for an understanding of the strength and work-hardening of deformed materials.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jakobsen, Bo -- Poulsen, Henning F -- Lienert, Ulrich -- Almer, Jonathan -- Shastri, Sarvjit D -- Sorensen, Henning O -- Gundlach, Carsten -- Pantleon, Wolfgang -- New York, N.Y. -- Science. 2006 May 12;312(5775):889-92.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Fundamental Research: Metal Structures in Four Dimensions, Materials Research Department, Riso National Laboratory, DK-4000 Roskilde, Denmark.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16690859" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Analytic approximations for the elastic moduli of two-phase materials (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-04-18
    Description: Author(s): Z. J. Zhang, Y. K. Zhu, P. Zhang, Y. Y. Zhang, W. Pantleon, and Z. F. Zhang Based on the models of series and parallel connections of the two phases in a composite, analytic approximations are derived for the elastic constants (Young's modulus, shear modulus, and Poisson's ratio) of elastically isotropic two-phase composites containing second phases of various volume fracti… [Phys. Rev. B 95, 134107] Published Mon Apr 17, 2017
    Keywords: Structure, structural phase transitions, mechanical properties, defects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Corrigendum: Dark-field X-ray microscopy for multiscale structural characterization (2015)
    Springer Nature
    Details
    Publication Date: 2015-03-07
    Description: Corrigendum Nature Communications doi: 10.1038/ncomms7612 Authors: H. Simons, A. King, W. Ludwig, C. Detlefs, W. Pantleon, S. Schmidt, F. Stöhr, I. Snigireva, A. Snigirev, H. F. Poulsen
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 9
    Electronic Resource
    Electronic Resource
    X-ray determination of dislocation density and arrangement in plastically deformed copper (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 33 (2000), S. 1284-1294 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Using the kinematical theory of X-ray scattering by crystals with dislocations as developed by Krivoglaz et al. and Wilkens, the dislocation content of compressed copper single and polycrystals was investigated by means of profile analysis of selected diffraction peaks. Measurements of radial intensity distributions I(2θ) were performed with a double-crystal spectrometer in the case of the single crystals and with conventional polycrystal diffractometers in the case of the polycrystals. Additionally, the misorientations Θ occurring within the dislocation cell structure because of the accumulation of excess dislocations of one sign were investigated by means of rocking curves of the single-crystal reflections and by evaluation of electron backscattering patterns (EBSPs). Within a wide deformation range, the mean total dislocation density ρd can be related well to the flow stress via the Taylor relationship. Assuming a random distribution of the misorientations Θ between adjacent dislocation cells, the evaluation of the rocking curves gives mean values 〈|Θ|〉 much smaller than those determined by EBSP analysis. For this reason, a model of a dislocation cell structure with restrictedly correlated misorientations, which leads to better agreement of the X-ray and the EBSP data, is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889800008256
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  • 10
    Electronic Resource
    Electronic Resource
    Stauchvesuche bei hohen Formänderungsgeschwindigkeiten mit Hilfe eines ballistischen Plastometers (1996)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 27 (1996), S. 417-425 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Compression tests at high strain rates using a ballistic testing systemDynamic compression tests at strain rates φ between 103 s-1 and 104 s-1 and high temperatures were performed by means of a ballistic testing system. The equipment allows the determination of stress strain curves. Because the specimen can be quenched immediately after the deformation process, microstructural investigations (optical microscopy, TEM, X-ray analysis etc.) are possible. The compression of cutted specimens allows the application of visioplastic methods. In the present work the results of dynamic compression tests of Copper and Aluminium are presented and compared with such of quasistatic tests.
    Notes: Mit einem ballistischen Plastometer wurden dynamische Stauchversuche bei Umformgeschwindigkeiten φ zwischen 103 s-1 und 104 s-1 sowie verschiedenen Temperaturen durchgeführt. Die Anlage ist zur Aufnahme von Fließkurven geeignet. Im Anschluß an den Verformungsvorgang kann die Probe abgeschreckt werden, so daß Strukturuntersuchungen (Licht- und Elektronenmikroskopie, röntgenografische Methoden usw.) am Deformationszustand des Werkstoffes möglich sind. Die Verformung geteilter Proben gestattet die Einbeziehung visioplastischer Methoden in die Auswertung. Die Ergebnisse von dynamischen Stauchversuchen an Kupfer und Aluminium werden vorgestellt und mit bei quasistatischer Verformung ermittelten Resultaten verglichen.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19960270905
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