Relevant bibliographies by topics / Dislocation transport

Academic literature on the topic 'Dislocation transport'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Dislocation transport"

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Gbemou, Kodjovi, Jean Marc Raulot, Vincent Taupin, and Claude Fressengeas. "Continuous Modeling of Dislocation Cores Using a Mechanical Theory of Dislocation Fields." Materials Science Forum 879 (November 2016): 2456–62. http://dx.doi.org/10.4028/www.scientific.net/msf.879.2456.

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A one-dimensional model of an elasto-plastic theory of dislocation fields is developed to model planar dislocation core structures. This theory is based on the evolution of polar dislocation densities. The motion of dislocations is accounted for by a dislocation density transport equation where dislocation velocities derive from Peach-Koehler type driving forces. Initial narrow dislocation cores are shown to spread out by transport under their own internal stress field and no relaxed configuration is found. A restoring stress of the lattice is necessary to stop this infinite relaxation and it is derived from periodic sinusoidal energy of the crystal. When using the Peierls sinusoidal potential, a compact equilibrium core configuration corresponding to the Peierls analytical solution is obtained. The model is then extended to use generalized planar stacking fault energies as an input and is applied to the determination of properties of planar dislocation cores in crystalline materials. Dissociations of edge and screw dislocation cores in basal and prismatic planes of Zirconium are shown.
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Lund, Fernando, and Bruno Scheihing-Hitschfeld. "The Scattering of Phonons by Infinitely Long Quantum Dislocations Segments and the Generation of Thermal Transport Anisotropy in a Solid Threaded by Many Parallel Dislocations." Nanomaterials 10, no. 9 (August 29, 2020): 1711. http://dx.doi.org/10.3390/nano10091711.

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A canonical quantization procedure is applied to the interaction of elastic waves—phonons—with infinitely long dislocations that can oscillate about an equilibrium, straight line, configuration. The interaction is implemented through the well-known Peach–Koehler force. For small dislocation excursions away from the equilibrium position, the quantum theory can be solved to all orders in the coupling constant. We study in detail the quantum excitations of the dislocation line and its interactions with phonons. The consequences for the drag on a dislocation caused by the phonon wind are pointed out. We compute the cross-section for phonons incident on the dislocation lines for an arbitrary angle of incidence. The consequences for thermal transport are explored, and we compare our results, involving a dynamic dislocation, with those of Klemens and Carruthers, involving a static dislocation. In our case, the relaxation time is inversely proportional to frequency, rather than directly proportional to frequency. As a consequence, the thermal transport anisotropy generated on a material by the presence of a highly-oriented array of dislocations is considerably more sensitive to the frequency of each propagating mode, and, therefore, to the temperature of the material.
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Murphy, John D., A. Giannattasio, Charles R. Alpass, Semih Senkader, Robert J. Falster, and Peter R. Wilshaw. "The Influence of Nitrogen on Dislocation Locking in Float-Zone Silicon." Solid State Phenomena 108-109 (December 2005): 139–44. http://dx.doi.org/10.4028/www.scientific.net/ssp.108-109.139.

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Dislocation locking by nitrogen impurities has been investigated in float-zone silicon with nitrogen concentrations of 2.2 x 1015cm-3 and 3 x 1014cm-3. The stress required to unlock dislocations pinned by nitrogen impurities was measured as a function of annealing time (0 to 2500 hours) and temperature (550 to 830°C). For all conditions investigated the locking effect was found to increase linearly with annealing time before saturating. It is assumed that the rate of increase of unlocking stress with annealing time is a measure of transport of nitrogen to the dislocation core. This rate of increase was found to depend linearly on nitrogen concentration, which is consistent with transport by a dimeric species, whose activation energy for diffusion is approximately 1.4eV. The saturation unlocking stress has been found to be dependent on the nitrogen concentration. Additionally, the temperature dependence of the stress required to move dislocations immobilised by nitrogen impurities has been studied. By assuming a value for the binding energy of the nitrogen to the dislocation, the density of the locking species at the dislocation core has been calculated.
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Maroudas, Dimitris, and Robert A. Brown. "Constitutive modeling of the effects of oxygen on the deformation behavior of silicon." Journal of Materials Research 6, no. 11 (November 1991): 2337–52. http://dx.doi.org/10.1557/jmr.1991.2337.

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A systematic theory is presented that models the effects of interstitial oxygen on the deformation behavior of silicon. The theory is based on calculation of the dependence of the dislocation velocity on the applied stress in the crystal and determination of the locking and unlocking stresses for dislocation motion. Internal stresses in the oxygen-hardened crystals are modeled by the superposition of the unlocking stress, a back stress due to the interaction between mobile dislocations, and an internal stress that arises from the interaction between a dislocation and the oxygen cloud around other dislocations. The initiation of dislocation multiplication is modeled as a two-step thermally activated process; the first step is the unlocking of the dislocation and the second step is the formation of jogs along the dislocation line. The coupled model for oxygen transport and dislocation motion is used to simulate crystal deformation in dynamic experiments and to reproduce stress-strain curves. The predictions of the initial stage of deformation are in good agreement with the experimental data of Yonenaga et al. [J. Applied Phys. 56, 2346 (1984)].
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NITTA, S., T. KASHIMA, R. NAKAMURA, M. IWAYA, H. AMANO, and I. AKASAKI. "MASS TRANSPORT OF GaN AND REDUCTION OF THREADING DISLOCATIONS." Surface Review and Letters 07, no. 05n06 (October 2000): 561–64. http://dx.doi.org/10.1142/s0218625x00000567.

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Mass transport of patterned GaN at around 1100°C in nitrogen with an ammonia atmosphere has been discovered for the first time. The mass transport process is found to be affected by the anisotropy of surface energy of GaN. Behaviors of threading dislocations which are predominantly of the mixed type and the pure edge type are affected by the anisotropy during mass transport. Mixed type dislocations are bent keeping the geometrical relationship normal to the surfaces, while pure edge type dislocations are bent horizontally. This new-found process, the so-called "mass transport epitaxy," is one of the best methods for achieving low dislocation density GaN on the highly lattice-mismatched substrate.
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Gagel, J., D. Weygand, and P. Gumbsch. "Discrete Dislocation Dynamics simulations of dislocation transport during sliding." Acta Materialia 156 (September 2018): 215–27. http://dx.doi.org/10.1016/j.actamat.2018.06.002.

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Zhao, Yue, Lucile Dezerald, and Jaime Marian. "Electronic Structure Calculations of Oxygen Atom Transport Energetics in the Presence of Screw Dislocations in Tungsten." Metals 9, no. 2 (February 20, 2019): 252. http://dx.doi.org/10.3390/met9020252.

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Plastic flow in body-centered cubic (bcc) alloys is governed by the thermally-activated motion of screw dislocations in close-packed planes. In bcc interstitial solid solutions, solute diffusion can occur at very fast rates owing to low migration energies and solute concentrations. Under mechanical loading, solutes may move on the same or similar time scale as dislocations glide, even at low temperatures, potentially resulting in very rich co-evolution processes that may have important effects in the overall material response. It is therefore important to accurately quantify the coupling between interstitial impurities and dislocations, so that larger-scale models can correctly account for their interactions. In this paper, we use electronic structure calculations to obtain the energetics of oxygen diffusion under stress and its interaction energy with screw dislocation cores in bcc tungsten. We find that oxygen atoms preferentially migrate from tetrahedral to tetrahedral site with an energy of 0.2 eV. This energy couples only weakly to hydrostatic and deviatoric deformations, with activation volumes of less than 0.02 and 0.02 b 3 , respectively. The strongest effect is found for the inelastic interaction between O atoms and screw dislocation cores, which leads to attractive energies between 1.2 and 1.9 eV and sometimes triggers a transformation of the screw dislocation core from an easy core configuration to a hard core configuration.
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Oktyabrsky, S., R. Kalyanaraman, K. Jagannadham, and J. Narayan. "Dislocation structure of low-angle grain boundaries in YBa2Cu3O7−δ/MgO films." Journal of Materials Research 14, no. 7 (July 1999): 2764–72. http://dx.doi.org/10.1557/jmr.1999.0369.

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Grain boundaries in laser-deposited YBa2Cu3O7−δ (YBCO)/MgO thin films have been investigated by high-resolution transmission electron microscopy. The films exhibit perfect texturing with YBCO(001)/MgO(001) giving rise to low-angle [001] tilt grain boundaries resulting from the grains with the c axis normal to the substrate surface and with misorientation in the a-b plane. The atomic structure of the grain boundaries was analyzed by using a dislocation model. Low-angle grain boundaries have been found to be aligned along (100) and (110) interface planes. For the (110) boundary plane, the low-energy dislocation configuration was found to consist of an array of alternating [100] and [010] dislocations. We have calculated the energy of various configurations and shown that the energy of the (110) boundary with dissociated dislocations is comparable to that of the (100) boundary, which explains the coexistence of (100) and (110) interface facets along the boundary. We have also modeled critical current transport through grain boundaries with various structures and found that the low-energy (110) grain boundary with dissociated dislocation array is expected to transport a lower superconducting current (by 25% for 6° misorientation) than (100) boundaries.
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Dalmau, Rafael, Jeffrey Britt, Hao Yang Fang, Balaji Raghothamachar, Michael Dudley, and Raoul Schlesser. "X-Ray Topography Characterization of Large Diameter AlN Single Crystal Substrates." Materials Science Forum 1004 (July 2020): 63–68. http://dx.doi.org/10.4028/www.scientific.net/msf.1004.63.

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Large diameter aluminum nitride (AlN) substrates, up to 50 mm, were manufactured from single crystal boules grown by physical vapor transport (PVT). Synchrotron-based x-ray topography (XRT) was used to characterize the density, distribution, and type of dislocations. White beam topography images acquired in transmission geometry were used to analyze basal plane dislocations (BPDs) and low angle grain boundaries (LAGBs), while monochromatic beam, grazing incidence images were used to analyze threading dislocations. Boule diameter expansion, without the introduction of LAGBs around the periphery, was shown. A 48 mm substrate with a uniform threading dislocation density below 7.0 x 102 cm-2 and a BPD of 0 cm-2, the lowest dislocation densities reported to date for an AlN single crystal this size, was demonstrated.
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Wulfinghoff, Stephan, Vedran Glavas, and Thomas Böhlke. "Dislocation Transport in Single Crystals and Dislocation-based Micromechanical Hardening." PAMM 11, no. 1 (December 2011): 449–50. http://dx.doi.org/10.1002/pamm.201110216.

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Dissertations / Theses on the topic "Dislocation transport"

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Prokofjev, Sergei, Victor Zhilin, Erik Johnson, and Ulrich Dahmen. "The effect of the dislocation elasticity on the thermal motion of attached particle." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-193499.

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Valdenaire, Pierre-Louis. "Plasticité cristalline : Equations de transport et densités de dislocations." Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM002/document.

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Le comportement mécanique des alliages métalliques industriels, notamment ceux utilisés dans le domaine de l’aéronautique, est contrôlé par la présence de différents types de précipités et par la nucléation et propagation de défauts cristallins tels que les dislocations. La compréhension du comportement de ces matériaux nécessite des modèles continus afin d’accéder à l’échelle macroscopique. Cependant, même aujourd’hui, les théories conventionnelles de la plasticité utilisent des variables mésoscopique et des équations d’évolution qui ne reposent pas sur la notion de transport de dislocations. En conséquence, ces théories sont basées sur des lois phénoménologiques qu’il est nécessaire de calibrer pour chaque matériau et chaque application. Il est donc souhaitable d’établir le lien entre les échelles micro et macro afin de générer une théorie continue de la plasticité déduite analytiquement des équations fondamentales de la dynamique des dislocations. L’objet de cette thèse est précisément de contribuer à l’élaboration d’une telle théorie. La première étape a consisté à établir rigoureusement la procédure de changement d’échelle dans une situation simplifiée. Nous avons alors abouti à un système d’équations de transport hyperboliques sur des densités de dislocations contrôlées par des contraintes locales de friction et de backstress qui émergent du changement d’échelle. Nous avons ensuite développé une procédure numérique pour calculer ces termes et analyser leur comportement. Finalement, nous avons développé un schéma numérique efficace pour intégrer les équations de transport ainsi qu’un schéma spectral multi-grille pour résoudre l’équilibre élastique associé à un champ de déformation propre quelconque dans un milieu élastiquement anisotrope et inhomogène
The mechanical behavior of industrial metallic alloys, in particular those used in the aerospace industry, is controlled by the existence of several types of precipitates and by the nucleation and propagation of crystalline defects such as dis- locations. The understanding of this behavior requires continuous models to access the macroscopic scale. However, even today, conventional plasticity theories use mesoscopic variables and evolution equations that are not based on the transport of dislocations. Therefore, these theories are based on phenomenological laws that must be calibrated for each material, or, for each specific applications. It is therefore highly desirable to make link between the micro and macro scales, in order to derive a continuous theory of plasticity from the fundamental equations of the dislocation dynamics. The aim of this thesis is precisely to contribute the elaboration of such a theory. The first step has consisted to rigorously establish a coarse graining procedure in a simplified situation. We have then obtained a set of hyperbolic transport equations on dislocation densities, controlled by a local friction stress and a local back-stress that emerge from the scale change. We have then developed a numerical procedure to compute these local terms and analyze their behavior. Finally, we have developed an efficient numerical scheme to integrate the transport equations as well as a multigrid spectral scheme to solve elastic equilibrium associated to an arbitrary eigenstrain in an elastically heterogeneous and anisotropic medium
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Prokofjev, Sergei I., Erik Johnson, and Ulrich Dahmen. "Kinetics of dissolution of liquid Pb nano-inclusions attached to a dislocation in aluminum." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-198539.

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Prokofjev, Sergei, Victor Zhilin, Erik Johnson, and Ulrich Dahmen. "The effect of the dislocation elasticity on the thermal motion of attached particle." Diffusion fundamentals 6 (2007) 29, S. 1-2, 2007. https://ul.qucosa.de/id/qucosa%3A14204.

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Prokofjev, Sergei I., Erik Johnson, and Ulrich Dahmen. "Correlated thermal motion of two liquid Pb inclusions on a dislocation in an Al-based alloy." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-183698.

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Prokofjev, Sergei I., Erik Johnson, and Ulrich Dahmen. "Kinetics of dissolution of liquid Pb nano-inclusions attached to a dislocation in aluminum." Diffusion fundamentals 24 (2015) 41, S. 1, 2015. https://ul.qucosa.de/id/qucosa%3A14558.

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Prokofjev, Sergei I., Erik Johnson, and Ulrich Dahmen. "Correlated thermal motion of two liquid Pb inclusions on a dislocation in an Al-based alloy." Diffusion fundamentals 20 (2013) 81, S. 1-2, 2013. https://ul.qucosa.de/id/qucosa%3A13668.

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Hernandez, Velazquez Hector Alonso. "Numerical stabilization for multidimensional coupled convection-diffusion-reaction equations: Applications to continuum dislocation transport." Doctoral thesis, Universite Libre de Bruxelles, 2017. https://dipot.ulb.ac.be/dspace/bitstream/2013/257833/6/contratHH.pdf.

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Partial differential equations having diffusive, convective and reactive terms appear naturally in the modeling of a large variety of processes of practical interest in several branches of science such as biology, chemistry, economics, physics, physiology and materials science. Moreover, in some instances several species or components interact with each other requiring to solve strongly coupled systems of convection-diffusion-reaction equations. Of special interest for us is the numerical treatment of the advection dominated continuum dislocation transport equations used to describe the plastic behavior of crystalline materials.Analytical solutions for such equations are extremely scarce and practically limited to linear equations with homogeneous coefficients and simple initial and boundary conditions. Therefore, resorting to numerical approximations is the most affordable and often the only viable strategy to deal with such models. However, when classical numerical methods are used to approximate the solutions of such equations, even in the simplest one dimensional case in the steady state regime for a single equation, instabilities in the form of node to node spurious oscillations are found when the convective or reactive terms dominate over the diffusive term.To address such issues, stabilization techniques have been developed over the years in order to handle such transport equations by numerical means, overcoming the stability difficulties. However, such stabilization techniques are most often suited for particular problems. For instance the Streamline Upwind Petrov-Galerkin method, to name only one of the most well-known, successfully eliminates spurious oscillations for single advection-diffusion equations when its advective form is discretized, but have been shown useless if the divergence form is used instead. Additionally, no extensive work has been carried out for systems of coupled equations. The reason for this immaturity is the lack of a maximum principle when going from a single transport equation towards systems of coupled equations.The main aim of this work is to present a stabilization technique for systems of coupled multidimensional convection-diffusion-reaction equations based on coefficient perturbations. These perturbations are optimally chosen in such a way that certain compatibility conditions analogous to a maximum principle are satisfied. Once the computed perturbations are injected in the classical Bubnov-Galerkin finite element method, they provide smooth and stable numerical approximations.Such a stabilization technique is first developed for the single one-dimensional convection-diffusion-reaction equation. Rigorous proof of its effectiveness in rendering unconditionally stable numerical approximations with respect to the space discretization is provided for the convection-diffusion case via the fulfillment of the discrete maximum principle. It is also demonstrated and confirmed by numerical assessments that the stabilized solution is consistent with the discretized partial differential equation, since it converges to the classical Bubnov-Galerkin solution if the mesh Peclet number is small enough. The corresponding proofs for the diffusion-reaction and the general convection-diffusion-reaction cases can be obtained in a similar manner. Furthermore, it is demonstrated that this stabilization technique is applicable irrespective of whether the advective or the divergence form is used for the spatial discretization, making it highly flexible and general. Subsequently the stabilization technique is extended to the one-dimensional multiple equations case by using the superposition principle, a well-known strategy used when solving non-homogeneous second order ordinary differential equations. Finally, the stabilization technique is applied to mutually perpendicular spatial dimensions in order to deal with multidimensional problems.Applications to several prototypical linear coupled systems of partial differential equations, of interest in several scientific disciplines, are presented. Subsequently the stabilization technique is applied to the continuum dislocation transport equations, involving their non-linearity, their strongly coupled character and the special boundary conditions used in this context; a combination of additional difficulties which most traditional stabilization techniques are unable to deal with. The proposed stabilization scheme has been successfully applied to these equations. Its effectiveness in stabilizing the classical Bubnov-Galerkin scheme and being consistent with the discretized partial differential equation are both demonstrated in the numerical simulations performed. Such effectiveness remains unaffected when different types of dislocation transport models with constant or variable length scales are used.These results allow envisioning the use of the developed technique for simulating systems of strongly coupled convection-diffusion-reaction equations with an affordable computational effort. In particular, the above mentioned crystal plasticity models can now be handled with reasonable computation times without the use of extraordinary computational power, but still being able to render accurate and physically meaningful numerical approximations.
Doctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
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Kords, Christoph [Verfasser]. "On the role of dislocation transport in the constitutive description of crystal plasticty / Christoph Kords." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2014. http://d-nb.info/1049557328/34.

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Sumiyoshi, Hiroaki. "Geometrical Responses in Topological Materials." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225387.

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Books on the topic "Dislocation transport"

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Murav'ev, Dmitriy, Aleksandr Rahmangulov, Nikita Osincev, Sergey Kornilov, and Aleksandr Cyganov. The system "seaport - "dry" port". ru: INFRA-M Academic Publishing LLC., 2022. http://dx.doi.org/10.12737/1816639.

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The monograph presents an approach to solving the problem of increasing the throughput and processing capacity of seaports in conditions of limiting their territorial dislocation and increasing the unevenness of external and internal cargo flows. The basis of the approach is the proposed system of the main parameters of the dry port and the methodology of simulation modeling of the functioning of the system "seaport - dry port". The material is illustrated with examples of the implementation of the developed approach, including model scenarios of multi-agent optimization of the parameters of the system under study. The proposed approach and the developed methodology can be used to justify management decisions on the balanced development of transport and logistics infrastructure of the regions hosting sea and dry ports. It is intended for specialists of transport and logistics companies, engineering and technical workers engaged in solving problems in the field of logistics, supply chain management and transport infrastructure design. In addition, it is recommended to students in the following programs: postgraduate studies 23.06.01 "Land transport engineering and technology" (focus "Transport and transport-technological systems of the country, its regions and cities, organization of production in transport") and 27.06.01 "Management in technical systems" (focus "Management of transportation processes"); master's degree 23.04.01 "Technology of transport processes" (profile "Organization of transportation and management in a single transport system"); bachelor's degree 38.03.02 "Management" (profile "Logistics") and 23.03.01 "Technology of transport processes".
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Kaur, Inderjeet. Fundamentals of grain and interphase boundary diffusion. 2nd ed. Stuttgart: Max-Planck-Institut für Metallforschung and Institut für Metallkunde, 1989.

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Kaur, Inderjeet. Fundamentals of grain and interphase boundary diffusion. 3rd ed. Chichester: John Wiley, 1995.

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Sergeenkov, Sergei. 2D arrays of Josephson nanocontacts and nanogranular superconductors. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533046.013.21.

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This article examines many novel effects related to the magnetic, electric, elastic and transport properties of Josephson nanocontacts and nanogranular superconductors using a realistic model of two-dimensional Josephson junction arrays. The arrays were created by a 2D network of twin-boundary dislocations with strain fields acting as an insulating barrier between hole-rich domains in underdoped crystals. The article first describes a model of nanoscopic Josephson junction arrays before discussing some interesting phenomena, including chemomagnetism and magnetoelectricity, electric analog of the ‘fishtail‘ anomaly and field-tuned weakening of the chemically induced Coulomb blockade, a giant enhancement of the non-linear thermal conductivity in 2D arrays, and thermal expansion of a singleJosephson contact.
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Sutton, Adrian P. Physics of Elasticity and Crystal Defects. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198860785.001.0001.

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Mechanical properties of crystalline materials are almost always dominated by the defects within them. The ability to shape metals into pipes, girders and furniture stems from the generation, motion and interaction of these defects. Defects are also the agents of chemical changes within crystals, enabling mass transport by atomic diffusion and changes of phase. Defects distort the crystal and these distortions enable defects to interact over large distances. The theory of elasticity is used to describe these interactions. Assuming no familiarity with the theory, this book introduces the reader to linear elasticity and its application to point defects, dislocations and cracks. A unique feature of the book is the attention given to the atomic structure of defects and its influence on their properties and their elastic fields. Where it is available brief biographical information is provided about prominent contributors to the field. This textbook is written for postgraduate students in physics, engineering and materials science. It is very likely that even those students with some knowledge of elasticity and defects will find much that is new to them in this book.There are exercises to help the student check their understanding as they work through each chapter. The student is guided through more advanced problems at the end of each chapter. Worked solutions to all exercises and problems are available to course instructors from the OUP website. The last chapter describes four technologically important areas requiring fundamental research, with suggestions for possible PhD projects.
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Book chapters on the topic "Dislocation transport"

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Bernstein, Mitchell, and S. Robert Rozbruch. "Trifocal Tandem Transport for Proximal Tibial Bone Defect and Fracture Dislocation of the." In Limb Lengthening and Reconstruction Surgery Case Atlas, 1–7. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-02767-8_327-1.

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Bernstein, Mitchell, and S. Robert Rozbruch. "Case 13: Trifocal Tandem Transport for Proximal Tibial Bone Defect and Fracture Dislocation of the Knee." In Limb Lengthening and Reconstruction Surgery Case Atlas, 89–95. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18026-7_327.

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Prokofjev, S. I., E. Johnson, V. M. Zhilin, and U. Dahmen. "Influence of Elasticity of Dislocations on Thermal Motion of Trapped Liquid Pb Inclusions in Al." In Mass and Charge Transport in Inorganic Materials III, 98–103. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-02-8.98.

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"Dislocation Transport." In Mechanics of Dislocation Fields, 49–88. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781118578285.ch3.

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Hwang, C., and I. M. Bernstein. "A DEMONSTRATION OF DISLOCATION TRANSPORT OF HYDROGEN IN IRON." In Perspectives in Hydrogen in Metals, 249–54. Elsevier, 1986. http://dx.doi.org/10.1016/b978-0-08-034813-1.50036-x.

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Baradel, Lacey. "Dislocation and Connection in John Sloan's Scenes of Urban Transport." In Mobility and Identity in US Genre Painting, 123–53. Routledge, 2020. http://dx.doi.org/10.4324/9780367810122-5.

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Mao, Er-Wang, Wen-Qin Zhao, Hong-Rui Zhang, Ai-Zhen Li, Jian-Min Chen, and Guo-Ping Fang. "The Influence of Strain and Dislocations on Transport Properties of GaAs/Si Strained-Layer Heterojunctions." In December 16, 515–20. De Gruyter, 1988. http://dx.doi.org/10.1515/9783112480786-023.

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Mao, Ek-Wang, Wen-Qin Zhao, Hong-Rui Zhang, Ai-Zhen Li, Jian-Min Chen, and Guo-Ping Fang. "The Influence of Strain and Dislocations on Transport Properties of GaAs/Si Strained-Layer Heterojunctions." In December 16, 515–21. De Gruyter, 1988. http://dx.doi.org/10.1515/9783112495544-024.

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"with more than 300,000 inhabitants. Nowadays the central economic activity has shifted from fishing and agriculture to wage-earning jobs. The paving of roads, public transport and the diffusion of the media have been very important factors for their interconnection with urban culture. Tourism has developed at a fast rate in this region, which has led to the spread of hotels, restaurants and trade oriented to foreigners, both tourists and those who have is a disparity between these men and women in these communities. The male activity. Apart from such occupational activity in these communities, the religious meetings. in the same area in a number of houses. Women have a pivotal role in is old and the children are adults, he becomes dependent on another power. She assumes the authority held by to the husband and unites capelinha (little chapel), church board member, and so on. Furthermore, both the settling in their midst of foreign in tourism, and the dislocation of many native residents in the city. Moreover, the community has Narratives of witches and female power." In Gender and Witchcraft, 260–62. Routledge, 2013. http://dx.doi.org/10.4324/9780203055830-30.

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Conference papers on the topic "Dislocation transport"

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Hochrainer, T., M. Zaiser, P. Gumbsch, Theodore E. Simos, George Psihoyios, and Ch Tsitouras. "Dislocation Transport and Line Length Increase in Averaged Descriptions of Dislocations." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS: International Conference on Numerical Analysis and Applied Mathematics 2009: Volume 1 and Volume 2. AIP, 2009. http://dx.doi.org/10.1063/1.3241258.

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2

Takai, Kenichi, and Megumi Kitamura. "Hydrogen Dragging by Moving Dislocation and Enhanced Lattice Defect Formation in 316L and 304 Stainless Steels." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97231.

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Little is known about an enhanced lattice defect formation due to an interaction between hydrogen and dislocation in face-centered cubic (fcc) metals such as stainless steels. In the present study, hydrogen spectra evolved from Type 316L and 304 stainless steels during elastic and plastic deformation were detected using a quadrupole mass spectrometer. The amount of lattice defect enhanced by hydrogen and strain was measured using thermal desorption analysis. For 316L stainless steel, hydrogen desorption increased rapidly when plastic deformation began, since the dislocation dragged hydrogen to the surface of the specimen. In contrast, hydrogen desorption increased with applying strain for 304 stainless steel, because of phase transformation from austenite into martensite with larger hydrogen diffusivity. And the amount of desorbed hydrogen increased with decreasing strain rate. These results indicate that dislocation can drag and transport large amounts of hydrogen when the dislocation velocity approaches the hydrogen diffusion rate. The amount of lattice defects in stainless steels was enhanced by hydrogen and applied strain. The most probable reason for the increase in the amount of lattice defects can be ascribed to the increase in the amount of vacancy clusters. These findings lead to the conclusion that the interaction between dislocation and hydrogen enhances the formation of vacancy clusters, as a result, causes hydrogen embrittlement.
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3

Lu, I.-Lin, Yuh-Renn Wu, John M. Hinckley, and Jasprit Singh. "Role of interface roughness on lateral transport in InGaN/GaN LEDs: diffusion length, dislocation spacing, and radiative efficiency." In OPTO, edited by Jen-Inn Chyi, Yasushi Nanishi, Hadis Morkoç, Cole W. Litton, Joachim Piprek, and Euijoon Yoon. SPIE, 2010. http://dx.doi.org/10.1117/12.840424.

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HULICIUS, Eduard, František HÁJEK, Alice HOSPODKOVÁ, Pavel HUBÍK, Zuzana GEDEONOVÁ, Tomáš HUBÁČEK, Jiří PANGRÁC, and Karla KULDOVÁ. "General overview of GaN devices and transport properties of AlGaN/GaN HEMT structures - impact of dislocation density and improved design." In NANOCON 2021. TANGER Ltd., 2021. http://dx.doi.org/10.37904/nanocon.2021.4309.

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5

Okamoto, Shungo, Naomichi Saito, Kotaro Ito, Bei Ma, Ken Morita, Daisuke Iida, Kazuhiro Ohkawa, and Yoshihiro Ishitani. "Local Heat Energy Transport Analyses in Gallium-Indium-Nitride/Gallium Nitride Heterostructure by Microscopic Raman Imaging Exploiting Simultaneous Irradiation of Two Laser Beams." In ASME 2020 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/ipack2020-2570.

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Abstract Local heat transport in two GaxIn1-xN/GaN-heterostructures on sapphire substrates is investigated by microscopic Raman imaging using two lasers of 532 nm (Raman observation) and 325 nm (heat generation and Raman observation), which enables the separation of heat generation and Raman observation positions. It is found that E2(high) and A1(LO) modes of the Ga0.84In0.16N layer exhibit mutually different characteristics, which indicates the analysis of the occupation of the A1(LO) mode is available. E2(high) mode of the GaN layer observed by the 532-nm laser reveals that the transport of the heat energy generated in the Ga0.84In0.16N layer to the GaN under layer is blocked in the high-density area of misfit dislocation in the vicinity of the heterointerface.
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6

Ma, R. H., H. Zhang, M. Dudley, S. Ha, and M. Skowronski. "Modeling for Mass Transfer and Thermal Stress of Silicon Carbide PVT Growth." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39391.

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The growth of SiC bulk crystal is studied using a physical model including chemical reactions, mass transfer and growth kinetics. The thermal stress distribution in an irregular shaped growing crystal is predicted using a two-dimensional anisotropic stress model. The growth and stress models are integrated into an existing global heat transport model to investigate variation of thermal field, growth rate and the shape of the as-grown crystal as well as the thermal stress distribution during a real time growth processes. The onset of dislocation is also correlated with thermal elastic stress qualitatively using the CRSS model. The simulated results are compared with experimental measurement. The effects of the growth system geometry are also discussed.
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Reiche, M., M. Kittler, H. M. Krause, and H. Übensee. "Carrier transport on dislocations in silicon." In INTERNATIONAL CONFERENCE ON DEFECTS IN SEMICONDUCTORS 2013: Proceedings of the 27th International Conference on Defects in Semiconductors, ICDS-2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4865599.

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8

Karnesky, Richard A., Paul Chao, and Dean A. Buchenauer. "Hydrogen Isotope Permeation and Trapping in Additively Manufactured Steels." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65857.

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Additively manufactured (AM) austenitic stainless steels are intriguing candidates for the storage of gaseous hydrogen isotopes because complex vessel geometries can be built more easily than by using conventional machining options. Parts built with AM stainless steel tend to have excellent mechanical properties (with tensile strength, ductility, fatigue crack growth, and fracture toughness comparable to or exceeding that of wrought austenitic stainless steel). However, the solidification microstructures produced by AM processing differ substantially from the microstructures of wrought material. Some features may affect permeability, including some amount of porosity and a greater amount of ferrite. Because the diffusivity of hydrogen in ferrite is greater than in austenite (six orders of magnitude at ambient temperature), care must be taken to retain the performance that is taken for granted due to the base alloy chemistry. Furthermore, AM parts tend to have greater dislocation densities and greater amounts of carbon, nitrogen, and oxygen. These features, along with the austenite/ferrite interfaces, may contribute to greater hydrogen trapping. We report the results of our studies of deuterium transport in various austenitic (304L, 316, and 316L) steels produced by AM. Manufacturing by Powder Bed Fusion (PBF) and two different blown powder methods are considered here (Laser Engineered Net Shaping® (LENS®) and a Direct Laser Powder Deposition (DLPD) method with a higher laser power)). The hydrogen permeability (an equilibrium property) changes negligibly (less than a factor of 2), regardless of chemistry and processing method, when tested between 150 and 500 °C. This is despite increases in ferrite content up to FN = 2.7. However, AM materials exhibit greater hydrogen isotope trapping, as measured by permeation transients, thermal desorption spectra, and inert gas fusion measurement. The trapping energies are likely modest (<10 kJ/mol), but may indicate a larger population of trap sites than in conventional 300-series stainless steels.
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9

Sharma, Udit, and Douglas G. Ivey. "Microstructure of Microalloyed Linepipe Steels." In 2000 3rd International Pipeline Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/ipc2000-125.

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The aim of this study was to characterize the microstructure of microalloyed linepipe steels. The steels investigated were X70 (0.04 wt% C - 0.02 wt% Ti - 0.07 wt% Nb) and X80 (0.04 wt% C - 0.025 wt% Ti - 0.09 wt% Nb) steels, where the numbers refer to their specified minimum yield strength (SMYS) in ksi. This class of steels has the advantage of high strength and good toughness combined with minimal wall thickness (15.5 mm for X70 steel). These attributes result in considerable cost savings when installation of several hundreds of kilometers of pipeline is required for oil and natural gas recovery and transport. The present study focused on phase identification and quantification, distribution of alloying elements and inclusions and segregation effects. Both steels were primarily composed of a mixed ferrite structure, i.e., polygonal ferrite and acicular ferrite/bainite, with characteristic low angle grain boundaries and high dislocation densities. The proportion of acicular grains was higher for the X80 steel. Pockets of retained austenite, exhibiting a Kurdjumov-Sachs orientation relationship (KS-OR) with the adjoining ferrite, were found in both steels. Five general classes of precipitates were identified in both steels: 1) Very large (2–10 μm) cuboidal TiN particles nucleated on inclusions; 2) large (0.1–1.0 μm) cuboidal TiN particles; 3) medium sized (30–50nm), irregular shaped Nb-Ti carbonitrides; 4) fine (<20nm), rounded precipitates of Nb carbonitrides with traces of Mo; 5) very fine dispersed precipitates (<5 nm in size). For X80 steels many of the large TiN precipitates were observed with Nb-rich carbonitrides precipitated epitaxially on them. Inclusion content and morphology were analyzed in both steels. The inclusions in X70 steels were found to be primarily CaS with significant amounts of Al, O, Ti, Fe and Mn. They were essentially spherical in shape with small elliptical distortions along the rolling direction and across the width of the plate. The morphology of the inclusions in the X80 steel was very similar, however, they showed higher Mn levels.
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10

Weimann and Eastman. "Scattering of electrons at threading dislocations in GaN and consequences for current transport in vertical devices." In Proceedings IEEE/Cornell Conference on Advanced Concepts in High Speed Semiconductor Devices and Circuits. IEEE, 1997. http://dx.doi.org/10.1109/cornel.1997.649361.

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