Relevant bibliographies by topics / Crystal deformation

Academic literature on the topic 'Crystal deformation'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Crystal deformation"

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Gröschel, Alexander, Hannes Grillenberger, and Andreas Magerl. "Elastic deformations in a perfect bulk Si crystal studied by high-energy X-rays." Journal of Applied Crystallography 42, no. 5 (September 8, 2009): 758–67. http://dx.doi.org/10.1107/s0021889809030349.

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Long-range strain fields induced in highly perfect bulk crystals during the manufacturing process significantly affect the quality and may even lead to spontaneous fracturing. Obviously a quantitative assessment of these deformations is crucial. A possible means is to examine the diffraction of X-rays by strained crystals, as the deformations bear on the diffraction characteristics of such crystals. In this report a quantitative examination of the diffraction characteristics of a perfect silicon bulk crystal with long-range strain fields in a well defined geometry is presented. The experiments were carried out using a high-energy X-ray laboratory source. By simulating the elastic deformation of the crystal by a finite element program the strain fields of the diffracting crystal are accessed. From these, simulated data values for integrated intensities can be derived on the basis of the dynamical diffraction theory for slightly distorted crystals. The theoretical calculations show good agreement with the experimental measured values. The smallest deformation yielding a noticeable change of the integrated intensity can be associated with a bending radius of the diffracting lattice planes of 16 km.
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Romanova, Varvara, Ruslan Balokhonov, Olga Zinovieva, Dmitry Lychagin, Evgeniya Emelianova, and Ekaterina Dymnich. "Mechanical Aspects of Nonhomogeneous Deformation of Aluminum Single Crystals under Compression along [100] and [110] Directions." Metals 12, no. 3 (February 24, 2022): 397. http://dx.doi.org/10.3390/met12030397.

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The deformation behavior of aluminum single crystals subjected to compression along the [100] and [110] directions is numerically examined in terms of crystal plasticity. A constitutive model taking into account slip geometry in face-centered cubic crystals is developed using experimental data for the single-crystal samples with lateral sides coplanar to certain crystal planes. Two sets of calculations are performed using ABAQUS/Explicit to examine the features of plastic strain evolution in perfectly plastic and strain-hardened crystals. Special attention is given to the discussion of mechanical aspects of crystal fragmentation. Several distinct deformation stages are revealed in the calculations. In the first stage, narrow solitary fronts of plastic deformation are alternately formed near the top or bottom surfaces and then propagate towards opposite ends to save the symmetry of the crystal shape. The strain rate within the fronts is an order of magnitude higher than the average strain rate. The first stage lasts longer in the strain-hardened crystals, eventually giving way to an intermediate stage of multiple slips in different crystal parts. Finally, the crystal shape becomes asymmetrical, but no pronounced macroscopic strain localization has been revealed at any deformation stage. The second stage in perfectly plastic crystals relates to abrupt strain localization within a through-thickness band-shaped region, accompanied by macroscale crystal fragmentation. Stress analysis has shown that pure compression took place only in the first deformation stage. Once the crystal shape has lost its symmetry, the compressive stress in some regions progressively decreases to zero and eventually turns tensile.
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Kondou, Ryouji, and Tetsuya Ohashi. "High Density Bands of GN Dislocations Formed by Multi Body Interaction in Compatible Type Multi Crystal Models." Key Engineering Materials 340-341 (June 2007): 187–92. http://dx.doi.org/10.4028/www.scientific.net/kem.340-341.187.

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Slip deformation phenomena in compatible type multi crystal models subjected to tensile load are analyzed by a finite element crystal plasticity analysis code, and accumulation of geometrically-necessary and statistically-stored dislocations (GNDs and SSDs) are evaluated in detail. Crystal orientations for the grains are chosen so that mutual constraint of deformation through grain boundary planes does not take place. We call these models as compatible type multi crystals, because “compatibility requirements” at grain boundaries are automatically maintained by slip deformation only on the primary systems and uniform deformation is expected to occur in each grain. Results of the analysis, however, show non-uniform deformation with high density of GNDs accumulated in a form of band. Growth of such kind of structure of GNDs caused localized accumulation of SSDs at grain boundary triple junctions. Mechanism for the band-shaped accumulation of GNDs in the compatible type multi crystals are discussed from the viewpoint of multi body interactions which arise from shape change of crystal grains after slip deformation.
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Kumar, Ashok V., Chulho Yang, and Vijay B. R. Seelam. "Investigation of Localized Deformation in NiAl Single Crystals." Journal of Engineering Materials and Technology 120, no. 3 (July 1, 1998): 206–11. http://dx.doi.org/10.1115/1.2812344.

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Deformation of NiAl single crystals was studied using finite element analysis to investigate the modes of localized deformation. Constitutive parameters and hardening characteristics of the active slip systems were estimated by comparing numerical simulation results with experimental results. Deformation of tensile specimens of NiAl single crystal was simulated when loaded along different crystal orientations to understand the deformation mechanism that results in various localized modes of deformation. In particular, the formation of shear bands and kink bands was studied and the material and geometric characteristics that influence the formation of such localization were investigated.
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Zhang, Yong, Ning Hou, Liang-Chi Zhang, and Qi Wang. "Elastic-plastic-brittle transitions of potassium dihydrogen phosphate crystals: characterization by nanoindentation." Advances in Manufacturing 8, no. 4 (September 2, 2020): 447–56. http://dx.doi.org/10.1007/s40436-020-00320-3.

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AbstractPotassium dihydrogen phosphate (KDP) crystals are widely used in laser ignition facilities as optical switching and frequency conversion components. These crystals are soft, brittle, and sensitive to external conditions (e.g., humidity, temperature, and applied stress). Hence, conventional characterization methods, such as transmission electron microscopy, cannot be used to study the mechanisms of material deformation. Nevertheless, understanding the mechanism of plastic-brittle transition in KDP crystals is important to prevent the fracture damage during the machining process. This study explores the plastic deformation and brittle fracture mechanisms of KDP crystals through nanoindentation experiments and theoretical calculations. The results show that dislocation nucleation and propagation are the main mechanisms of plastic deformation in KDP crystals, and dislocation pileup leads to brittle fracture during nanoindentation. Nanoindentation experiments using various indenters indicate that the external stress fields influence the plastic deformation of KDP crystals, and plastic deformation and brittle fracture are related to the material’s anisotropy. However, the effect of loading rate on the KDP crystal deformation is practically negligible. The results of this research provide important information on reducing machining-induced damage and further improving the optical performance of KDP crystal components.
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Lu, Chun Peng, Hang Gao, and Xiao Ji Teng. "Tribological Properties of KDP Single Crystal." Applied Mechanics and Materials 490-491 (January 2014): 134–37. http://dx.doi.org/10.4028/www.scientific.net/amm.490-491.134.

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Scratch tests on (001) face, doubler face and tripler face of KDP crystals are carried out at room temperature. It shows that the friction ceoffcients of different crystal faces are affected seriously by the crystal oritations, their variation periods of (001) face, doubler face and tripler face are 90o, 180o and 180o, their attitudes of relative anisotropy are 50%, 43.8% and 43.8%, and all of them are less than 0.4. The scratch mechanism of KDP crystal consists of four types: elastic and plastic deformation, ploughing, microchip, and surface damage. Differences between elastic and plastic deformation and ploughing are not obvious due to the soft-brittle nature of KDP crystal.
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Grzegorczyk, Barbara, Wojciech Ozgowicz, and Elżbieta Kalinowska-Ozgowicz. "Influence of the Crystallographic Orientation of CuZn30 Single Crystal on the Portevin-Le Chatelier Effect." Solid State Phenomena 203-204 (June 2013): 406–10. http://dx.doi.org/10.4028/www.scientific.net/ssp.203-204.406.

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Plastic deformation of solid crystals is a complex process, mostly heterogeneous, due to the simultaneous effect of several deformation mechanisms. A dominating deformation mechanism depends on the properties of the material and external coefficients, viz. temperature, stress and strain rate. The applied Bridgman method permitted to obtain single crystal of the CuZn30 alloy adequate for plastic deformation investigations. Single crystal are characterized by selected crystallographic orientations from various areas of the basic triangle. In order to determine the influence of the crystallographic orientation on the Portevin-Le Chatelier effect selected single crystals were compressed at a temperature of 300°C at a strain rate of 10-3 s-1. Experiments confirmed the effect of the crystallographic orientation axis of CuZn30 single crystals on the observed differences in the intensity of stress oscillation on stress-strain curves.
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Sakurada, Eisaku, and Takashi Matsuo. "Change in Stress Axis with Creep Deformation in PST Crystal." Advanced Materials Research 15-17 (February 2006): 858–63. http://dx.doi.org/10.4028/www.scientific.net/amr.15-17.858.

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The superiority of creep in Ti-48at%Al alloy with fully transformed lamellar structure to that in Ti-50at%Al alloy with γ single phase is characterized by the extension of transient stage. This extension of the transient stage derives by the retarding effect of α2 plate on the onset of the accelerating stage, through suppressing the dynamically recrystallization which is the main reason of the accelerating stage. This superiority in Ti-48at%Al alloy will become more clear by investigating the creep of the single crystal designated as the PST crystal, because of removing the grain boundaries which is the formation site of dynamic recrystallization. By using the PST crystal, the predominant deformation using primary slip plane of γ plate will continue, because the α2 plate restricts the operation of other slip planes. In PST crystals with the angle between the stress axis and the lamellar plates, designated as φ, less than 45°, the uniform deformation will proceed, because of the decrease in creep rate due to the decreasing in Schmid factor through the monotonous decrease in φ. But these suppositions have not confirmed. In this study, the deformation manner of the PST crystals with φ of less than 45° is investigated by the analyzing of creep curve, macrostructure and inverse pole figure of the PST crystals interrupted the creep tests at 1148K/68.6MPa at the strains of 0.20 and 0.65. Inverse pole figures of PST crystal are obtained using SEM-EBSD method. By accepting the creep deformation, the stress axes of the PST crystals move for [001]-[1, – 11] line with slip system of (111)<1, – 01>, and after reaching at this line, the stress axis turn to [1, – 11] pole position with (111)<1, – 10> slip system. The change in stress axis is not homogeneous in gauge portion accepting small strain, by subjecting the further creep deformation up to the onset of the accelerating stage, this heterogeneous deformation in gauge portion disappeared.
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Магомедов, М. Н. "О хрупкости элементарных полупроводников." Физика твердого тела 65, no. 2 (2023): 212. http://dx.doi.org/10.21883/ftt.2023.02.54292.521.

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It is shown that the brittleness of a single-component covalent crystal (diamond, Si, Ge) is due to the “duplicity” of the paired potential of interatomic interaction for elastic (reversible) and for plastic (irreversible) deformation. This leads to the fact that the specific surface energy during plastic deformation of a covalent crystal is more than two times less than the specific surface energy during elastic deformation. Therefore, with a small deformation of a covalent crystal, it is energetically more advantageous to create a surface by irreversible breaking than by reversible elastic stretching. It is indicated that the brittle-ductile transition in a single-component covalent crystal is accompanied by metallization of covalent bonds on the surface. It is shown that the brittle-ductile transition temperature (TBDT) for single-component covalent crystals under static load has an upper limit: TBDT/Tm < 0.45, where Tm is the melting temperature.
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Dong, Jin Mei, Hong Fa Yu, and Mei Juan Wang. "Influence of Fly Ash on Magnesium Oxychloride Cement Deformation." Materials Science Forum 817 (April 2015): 252–56. http://dx.doi.org/10.4028/www.scientific.net/msf.817.252.

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The inhibition effect of fly ash on the deformation of magnesium oxychloride cement is not obvious. With the increase of fly ash, the deformation of magnesium oxychloride cement decreased at first, and then increased. The smallest deformation is the proportion of FA-35. The fly ash can promote the formation of the 5·1·8 phase crystal and slow the speed of 5·1·8 phase changing into Mg (OH)2. The growing crystals were disordered, like the scattered tree branches. The causes of FA-35 specimen expansion deformation can be explained by the configuration of the crystal.
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Dissertations / Theses on the topic "Crystal deformation"

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Thompson, Robert Peter. "Plastic deformation in complex crystal structures." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/286335.

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Many materials with complex crystal structures have attractive properties, including high specific strength, good creep resistance, oxidation resistance, often through high silicon or aluminium content. This makes them of interest for high temperature structural applications, but the use of many such phases is limited by low toughness. Even outside structural applications, brittle failure is a primary cause of failure in coatings and device materials and, therefore, improved toughness is desirable. In complex crystals plasticity, and hence toughness, is limited by the energy increases that occur as linear defects, dislocations, move. This is known as the lattice resistance. By understanding the factors controlling the lattice resistance in complex crystal structures, it is hoped that a general method for tailoring the flow stress of a material might be found. Present ductile-brittle criteria are based on simple ratios of polycrystalline elastic constants and are too limited to accurately capture flow behaviour. There are complex materials which, despite such criteria predicting brittle behaviour, exhibit low flow stresses, though on a limited number of slip systems: MAX phases, Mo$_2$BC, Nb$_2$Co$_7$ and Ta$_4$C$_{3-x}$ are examples of this. Where plastic flow is limited by the lattice resistance we must consider the effect of crystal structure on dislocation motion more directly. Aspects which are lost by considering bulk polycrystalline properties are elastic heterogeneity, elastic anisotropy and contributions to the energy changes by other interactions, such as electrostatic interactions. In this work examples of each of these are presented and modelled using an adapted version of the Peierls model. A Peierls model generalised to use the entire stiffness tensor has been implemented in Python; this allows the investigation of the effect of varying anisotropy on the yield stress of materials that would not be picked up by the use of polycrystalline elastic constants. Calculations using the changing elastic tensor during hydrogen loading of cementite suggest that hydrogen loading causes a dramatic reduction in the flow stress, consistent with experiments and associated with hydrogen embrittlement of steel. Materials for which empirical potentials can provide more insight than linear elasticity are explored with the example of ionic materials. This is done with a Peierls dislocation configuration and a molecular statics energy calculation. A simple model built electrostatic and Lennard-Jones interactions was used for the rocksalt structure, this model was found to describe the hard slip system well, but was insufficient to describe the softer slip system. Local heterogeneity in elastic properties is explored in the MAX phases where local variation in chemical environment, characterised by electronegativity, produces pronounced variation in the local stiffness within the unit cell. These local variations have been modelled with density functional theory and have been shown to be consistent with the macroscopic elastic properties while also explaining the apparent scatter in the elastic properties. These non-uniform strains are shown to have a dramatic effect on the flow stress of the MAX phases. The face-centred cubic Ti$_2$Ni structure has been used to experimentally demonstrate this effect of heterogeneity softening. The slip system was characterised by micropillar compression and the slip planes were found to be the {1 1 1} planes. The hardness of a range of alloys with the Ti$_2$Ni structure was characterised by nanoindentation of the {1 1 1} faces of single crystals. The hardness was found to decrease as the chemical, and thus elastic, heterogeneity of the unit cell increased, as expected. This effect of heterogeneity softening presents a potential route to tailoring the yield stress of crystals.
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Cumbest, Randolph J. "Crystal-plastic deformation and chemical evolution of clinoamphibole." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/54322.

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Clinoamphibole from a mylonitic amphibolite, located on Senja, Norway, exhibits microstructures characteristic of dynamic recrystallization, including larger host grains in a finer grained matrix of needle shaped amphibole. The matrix amphibole defines an LS fabric and host grains have core and mantle structures with a core containing undulose to patchy extinction and (100) deformation twinning surrounded by a mantle of recrystallized grains. In addition intragranular grains also occur within the cores. TEM analysis of the host grains revealed high densities of dislocations, dislocation arrays/subgrain boundaries parallel to (hk0), stacking faults, and (100) deformation micro-twins. Dark field, weak beam images show that the dislocations are commonly dissociated. Diffraction contrast experiments compared with computer simulation of dislocation images indicate the primary unit Burgers vector is [001]. This information in conjunction with trace analysis of glide loops and dislocation line direction shows that the following glide systems were operative: [001]{110}, [001](100), and possibly [001](010), in order of relative occurrence. These data along with dislocation energies are considered in order to propose a possible model for the [001] unit Burgers vector in the clinoamphibole structure. TEM also showed that matrix grains and intragranular grains have relatively low defect densities, and that the intergranular new grains occur at localities in the host grains characterized by high densities of dislocations. These observations along with the chemical and orientation relationships between the recrystallized grains and their host indicate that the new grains may have formed by heterogeneous nucleation and that further growth probably occurred by both strain assisted and chemically induced grain boundary migration or liquid film migration. This recrystallization event is interpreted to be synkinematic based on the fact that no recrystallization textures are present in the matrix grains and that the matrix grains define an LS fabric. However, the low defect densities in the matrix grains and the lack of intracrystalline strain in other phases indicate that post-kinematic recovery processes were active.
Ph. D.
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Sherry, A. H. "The deformation and fracture of a single crystal superalloy." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384116.

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Hillier, Graham Stewart. "The defect energies and deformation mechanisms of single crystal superalloys." Thesis, University of Cambridge, 1985. https://www.repository.cam.ac.uk/handle/1810/221896.

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Chen, Tzung-Ming. "Synthesis of compliant single crystal silicon mechanisms with large deformation." Tönning Lübeck Marburg Der Andere Verl, 2009. http://d-nb.info/995862664/04.

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Rowell, D. K. "Point defect calculations in ionic crystals." Thesis, University of Reading, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370129.

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Milligan, Walter W. Jr. "Yielding and deformation behavior of the single crystal superalloy PWA 1480." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/20152.

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Liang, Hong. "Crystal plasticity modelling of lengthscale effects in deformation and nano-indentation." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496995.

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Westbrooke, Eboni F. "Effect of crystallographic orientation on plastic deformation of single crystal nickel-base superalloys." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011466.

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Chaloupka, Ondrej. "Modelling evolution of anisotropy in metals using crystal plasticity." Thesis, Cranfield University, 2013. http://dspace.lib.cranfield.ac.uk/handle/1826/8435.

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Many metals used in modern engineering exhibit anisotropy. A common assumption when modelling anisotropic metals is that the level of anisotropy is fixed throughout the calculation. As it is well understood that processes such as cold rolling, forging or shock loading change the level of anisotropy, it is clear that this assumption is not accurate when dealing with large deformations. The aim of this project was to develop a tool capable to predict large deformations of a single crystal or crystalline aggregate of a metal of interest and able to trace an evolution of anisotropy within the material. The outcome of this project is a verified computational tool capable of predicting large deformations in metals. This computational tool is built on the Crystal Plasticity Finite Element Method (CPFEM). The CPFEM in this project is an implementation of an existing constitutive model, based on the crystal plasticity theory (the single crystal strength model), into the framework of the FEA software DYNA3D® . Accuracy of the new tool was validated for a large deformation of a single crystal of an annealed OFHC copper at room temperature. The implementation was also tested for a large deformation of a polycrystalline aggregate comprised of 512 crystals of an annealed anisotropic OFHC copper in a uniaxial compression and tension test. Here sufficient agreement with the experimental data was not achieved and further investigation was proposed in order to find out the cause of the discrepancy. Moreover, the behaviour of anisotropic metals during a large deformation was modelled and it was demonstrated that this tool is able to trace the evolution of anisotropy. The main benefit of having this computational tool lies in virtual material testing. This testing has the advantage over experiments in time and cost expenses. This tool and its future improvements, which were proposed, will allow studying evolution of anisotropy in FCC and BCC materials during dynamic finite deformations, which can lead to current material models improvement.
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Books on the topic "Crystal deformation"

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Raj, Subramanium Varada. Modeling the role of dislocation substructure during class M and exponential creep. [Washington, DC]: National Aeronautics and Space Administration, 1995.

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Havner, K. S. Finite plastic deformation of crystalline solids. Cambridge u.a: Cambridge Univ. Press, 2008.

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Dislocation dynamics during plastic deformation. Heidelberg: Springer, 2010.

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Finite plastic deformation of crystalline solids. Cambridge [England]: Cambridge University Press, 1992.

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Bouvier, Salima. Plasticity of cristalline materials: From dislocations to continuum. Hoboken, NJ: Wiley, 2011.

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Cristian, Teodosiu, ed. Large plastic deformation of crystalline aggregates. Wien: Springer, 1997.

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John, Gittus, and Zarka Joseph, eds. Modelling small deformations of polycrystals. London: Elsevier Applied Science Publishers, 1986.

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Creep of crystals: High-temperature deformation processes in metals, ceramics, and minerals. Cambridge [Cambridgeshire]: Cambridge University Press, 1985.

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Thorsteinsson, Thorsteinn. Textures and fabrics in the GRIP ice core, in relation to climate history and ice deformation. Bremerhaven: Alfred-Wegener-Institut für Polar- und Meeresforschung, 1996.

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Wierzbanowski, Krzysztof. Some results of theoretical study of plastic deformation and texture formation in polycrystals. Cracow: Akademia Górniczo-Hutnicza im. S. Staszica w Krakowie, 1987.

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Book chapters on the topic "Crystal deformation"

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Paterson, Mervyn S. "Deformation Mechanisms: Crystal Plasticity." In Materials Science for Structural Geology, 107–207. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5545-1_6.

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Stüwe, H. P. "Experimental Aspects of Crystal Plasticity." In Large Plastic Deformation of Crystalline Aggregates, 1–20. Vienna: Springer Vienna, 1997. http://dx.doi.org/10.1007/978-3-7091-2672-1_1.

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Stüwe, H. P. "Crystal Restoration during Severe Plastic Deformation." In Materials Science Forum, 175–78. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-985-7.175.

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Cox, S. F. "HIGH temperature creep of single crystal galena (PbS)." In Mineral and Rock Deformation: Laboratory Studies, 73–98. Washington, D. C.: American Geophysical Union, 1986. http://dx.doi.org/10.1029/gm036p0073.

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Kalidindi, Surya R. "A Crystal Plasticity Framework for Deformation Twinning." In Continuum Scale Simulation of Engineering Materials, 543–60. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527603786.ch27.

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Van Houtte, Paul. "Crystal Plasticity Based Modelling of Deformation Textures." In Microstructure and Texture in Steels, 209–24. London: Springer London, 2009. http://dx.doi.org/10.1007/978-1-84882-454-6_12.

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Hu, Ping, Liang Ying, and Bin He. "Constitutive Integration Algorithm of Crystal Thermal Deformation." In Hot Stamping Advanced Manufacturing Technology of Lightweight Car Body, 111–34. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2401-6_5.

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Swain, M. V., and R. C. Bradt. "“Nano” and “Micro” Hardnesses of Single Crystal Yttrium Aluminium Garnet (YAG) on the {111 }Plane." In Plastic Deformation of Ceramics, 195–206. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1441-5_17.

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Koyama, Tetsuo, Hiroyuki Miyamoto, Takuro Mimaki, Alexei Vinogradov, and Satoshi Hashimoto. "Microstructure Development of Copper Single Crystal Deformed by Equal Channel Angular Pressing." In Nanomaterials by Severe Plastic Deformation, 363–68. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527602461.ch6g.

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Philip, A. M., and J. H. Schmitt. "Effect of Crystal Anisotropy on the Interaction between Two Holes." In Anisotropy and Localization of Plastic Deformation, 87–90. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3644-0_20.

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Conference papers on the topic "Crystal deformation"

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Liu, Yuyun, Jiu-an Lv, Futao Cheng, and Yanlei Yu. "Photoinduced deformation of liquid crystal polymers." In SPIE Organic Photonics + Electronics, edited by Iam Choon Khoo. SPIE, 2014. http://dx.doi.org/10.1117/12.2061762.

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Zhang, Yan-Song, Hung-Sheng Weng, Shun-An Jiang, Ting-Shan Mo, Po-Chih Yang, Jia-De Lin, and Chia-Rong Lee. "Dual light and temperature-induced 3D symmetric deformation of Bragg-onion-like actuators." In Emerging Liquid Crystal Technologies XVII, edited by Igor Muševič, Liang-Chy Chien, and Nelson V. Tabiryan. SPIE, 2022. http://dx.doi.org/10.1117/12.2614747.

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Lee, Kyung Min, Vincent P. Tondiglia, Timothy J. Bunning, and Timothy J. White. "Time-dependent deformation of polymer network in polymer-stabilized cholesteric liquid crystals (Conference Presentation)." In Emerging Liquid Crystal Technologies XII, edited by Liang-Chy Chien. SPIE, 2017. http://dx.doi.org/10.1117/12.2250581.

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Caron, P., Y. Ohta, Y. G. Nakagawa, and T. Khan. "Creep Deformation Anisotropy in Single Crystal Superalloys." In Superalloys. TMS, 1988. http://dx.doi.org/10.7449/1988/superalloys_1988_215_224.

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Batukhtina, E. E., V. A. Romanova, R. R. Balokhonov, and V. S. Shakhijanov. "A crystal plasticity model for the deformation behavior of aluminum single crystals." In MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2016): Proceedings of the 10th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. Author(s), 2016. http://dx.doi.org/10.1063/1.4967063.

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Fortov, V. E., A. V. Gavrikov, D. N. Goranskaya, A. S. Ivanov, O. F. Petrov, R. A. Timirkhanov, José Tito Mendonça, David P. Resendes, and Padma K. Shukla. "Viscoplastic Deformation of Crystal-like Dusty Plasma Structures." In MULTIFACETS OF DUSTRY PLASMAS: Fifth International Conference on the Physics of Dusty Plasmas. AIP, 2008. http://dx.doi.org/10.1063/1.2997255.

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Ricker, R. E., D. J. Pitchure, and G. R. Myneni. "Interstitial Solutes and Deformation in Nb and Nb Single Crystals." In SINGLE CRYSTAL - LARGE GRAIN NIOBIUM TECHNOLOGY: International Niobium Workshop. AIP, 2007. http://dx.doi.org/10.1063/1.2770679.

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Wang, Hongbo, and William S. Oates. "A Phase Field Model of Photo-Induced Trans-Cis-Trans Bending of Liquid Crystal Elastomer Films." In ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3657.

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A new class of glassy liquid crystal elastomers are studied to understand their light-coupled deformation characteristics. In particular, the photomechanics of azobenzene liquid crystal elastomers is modeled using a nonlinear continuum mechanics approach coupled with time-dependent liquid crystal domain structure evolution to understand light polarization effects on deformation. Light propagation and absorption within the elastomer is modeled using Maxwell’s electro-magnetic equations. By consideration of electric energy due to light absorption, light-induced electrical stresses are introduced which provide the driving force for mechanical deformation via coupling with the azobenzene liquid crystals. A liquid crystal director (i.e., orientation of the liquid crystal molecule) is used to describe liquid crystal evolution and elastomer deformation. This aspect of the model is extended to include 3D effects to accommodate trans-cis-trans photoisomerization. This is coupled to plane stress, nonlinear mechanics to demonstrate key field-coupled mechanics relations governing this class of smart materials. The results show that the model successfully predicts large, bi-directional bending of the polymer film by controlling the polarization of light. The results are consistent with recent experimental data given in the literature.
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Su, Wei-Hung, and Yu-Heng Lo. "Deformation measurements using a stereo microscope." In Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XIII, edited by Shizhuo Yin and Ruyan Guo. SPIE, 2019. http://dx.doi.org/10.1117/12.2530711.

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Zhang, C. L., P. F. Feng, and D. Wang. "The Effect of Crystallographic Orientation on Material Removal Behavior of (001) Plane KDP Crystal in Nano-Scratch Test." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85869.

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KDP crystal has been widely used in harmonic generation and optical parametric oscillators due to its good nonlinear optical properties and high laser damage threshold. However, because of its inherent properties, such as fragility, hygroscopic, anisotropy and low rigidity etc., KDP crystal is regarded as one of the most difficult machining materials. Nanoscratch tests were conducted in [100], [110] and [010] orientation of (001) plane KDP crystal at room temperature under a ramp loading condition from 40μN to 200 mN using with a nanomechanical test system in scratch mode to study the effects of crystallographic orientations on plastic deformation and brittle deformation features of KDP crystal. A spherical monocrystalline diamond indenter was employed in this study. Penetration depths and residual deformations of the scratch tracks were collected during the scratch process. Morphology characteristics of the scratch grooves in different scratch directions, including plastic deformation features and brittle deformation features, were observed by scanning electron microscopy. The experimental results clearly showed that there exist two distinct material deformation modes of each scratch process: plastic deformation mode, and brittle deformation mode. Comparative studies of surface depth profiles and scratch groove features induced in different crystallographic orientations revealed that the anisotropy of (001) plane KDP crystal has significant effects on the deformation features. It also presented that [110] orientation of (001) plane KDP crystal has the maximal critical load and critical depth, and can produce the highest proportion plastic deformation, which imply that [110] orientation can get adequate surface quality of KDP crystal for diamond cutting, grinding, and milling etc..
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Reports on the topic "Crystal deformation"

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Bonner, B., C. Aracne, D. Farber, C. Boro, and D. Lassila. Deformation of Single Crystal Molybdenum at High Pressure. Office of Scientific and Technical Information (OSTI), February 2004. http://dx.doi.org/10.2172/15009799.

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Oliver, B., B. Huang, and W. Oliver. Crystal growth and deformation behavior of TiAl aluminides. Office of Scientific and Technical Information (OSTI), April 1990. http://dx.doi.org/10.2172/6816297.

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Kramer, M. Experimentally induced deformation mechanisms in single crystal sodic plagioclase. Office of Scientific and Technical Information (OSTI), January 1990. http://dx.doi.org/10.2172/6836203.

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Glushko, E. Ya, and A. N. Stepanyuk. Pneumatic photonic crystals: properties and application in sensing and metrology. [б. в.], 2018. http://dx.doi.org/10.31812/123456789/2875.

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A pneumatic photonic crystal i.e. a medium containing regularly distributed gas-filled voids divided by elastic walls is proposed as an optical indicator of pressure and temperature. The indicator includes layered elastic platform, optical fibers and switching valves, all enclosed into a chamber. We have investigated theoretically distribution of deformation and pressure inside a pneumatic photonic crystal, its bandgap structure and light reflection changes depending on external pressure and temperature.
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Adams, B., G. Campbell, W. King, D. Lassila, J. Stolken, S. Sun, and A. Swartz. Orientation imaging microscopy investigation of the compression deformation of a [011] ta single crystal. Office of Scientific and Technical Information (OSTI), January 1999. http://dx.doi.org/10.2172/8292.

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Patra, Anirban, Wei Wen, Enrique Martinez Saez, and Carlos Tome. A defect density-based constitutive crystal plasticity framework for modeling the plastic deformation of Fe-Cr-Al cladding alloys subsequent to irradiation. Office of Scientific and Technical Information (OSTI), February 2016. http://dx.doi.org/10.2172/1237412.

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Mandal, Anirban. Elastic-Plastic Deformation of Molybdenum Single Crystals Shocked to 12.5 GPa. Office of Scientific and Technical Information (OSTI), January 2020. http://dx.doi.org/10.2172/1595632.

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Ice, G., A. Habenschuss, J. C. Bilello, and R. Rebonato. High-resolution microdiffraction study of notch-tip deformation in Mo single crystals using x-ray synchrotron radiation. Office of Scientific and Technical Information (OSTI), December 1989. http://dx.doi.org/10.2172/10136532.

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Ice, G., A. Habenschuss, J. C. Bilello, and R. Rebonato. High-resolution microdiffraction study of notch-tip deformation in Mo single crystals using x-ray synchrotron radiation. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/5576552.

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Kysar, Jeffrey W. Combined Experimental and Computational Study of Plastic Deformation in Crystals and Bicrystals for the Development of Multi-Length Scale Constitutive Models. Fort Belvoir, VA: Defense Technical Information Center, February 2009. http://dx.doi.org/10.21236/ada495430.

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