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Relevant bibliographies by topics / Dislocation patterns

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Academic literature on the topic 'Dislocation patterns'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Dislocation patterns"

1

Lyu, Dandan, and Shaofan Li. "Recent developments in dislocation pattern dynamics: Current opinions and perspectives." Journal of Micromechanics and Molecular Physics 03, no. 03n04 (September 2018): 1840002. http://dx.doi.org/10.1142/s2424913018400027.

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The development of crystal plasticity theory based on dislocation patterns dynamics has been an outstanding problem in materials science and condensed matter of physics. Dislocation is the origin of crystal plasticity, and it is both the individual dislocation behavior as well as the aggregated dislocations behaviors that govern the plastic flow. The interactions among dislocations are complex statistical and stochastic events, in which the spontaneous emergence of organized dislocation patterns formations is the most critical and intriguing events. Dislocation patterns consist of quasi-periodic dislocation-rich and dislocation poor regions, e.g. cells, veins, labyrinths, ladders structures, etc. during cyclic loadings. Dislocation patterns have prominent and decisive effects on work hardening and plastic strain localization, and thus these dislocation micro-structures are responsible to material properties at macroscale. This paper reviews the recent developments of experimental observation, physical modeling, and computer modeling on dislocation microstructure. In particular, we focus on examining the mechanism towards plastic deformation. The progress and limitations of different experiments and modeling approaches are discussed and compared. Finally, we share our perspectives on current issues and future challenges in both experimental, analytical modeling, and computational aspects of dislocation pattern dynamics.

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Lu, G., J. G. Wen, W. Zhang, and R. Wang. "Simulation and application of the distorted ZOLZ patterns from dislocations in Si." Acta Crystallographica Section A Foundations of Crystallography 46, no. 2 (February 1, 1990): 103–12. http://dx.doi.org/10.1107/s0108767389010275.

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The previously reported distorted zeroth-order fringes in a bright-field Tanaka pattern from a dislocated region in silicon have been computer simulated and the experimental and the many-beam calculated patterns agree well. Calculations are carried out for nine distinct cases of edge, screw and 60° dislocations in a silicon crystal. The general usefulness of the distortion of the ZOLZ pattern in determining geometrical properties of a dislocation is discussed.

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Nabarro, F. R. N. "Sequences of dislocation patterns." Materials Science and Engineering: A 317, no. 1-2 (October 2001): 12–16. http://dx.doi.org/10.1016/s0921-5093(01)01192-3.

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Kummer, Anne, Xavier Crevoisier, Antoine Eudier, and Paul E. Di Cesare. "Calcaneocuboid and Naviculocuneiform Dislocation: An Unusual Injury of the Midfoot." Case Reports in Orthopedics 2020 (September 28, 2020): 1–8. http://dx.doi.org/10.1155/2020/8818823.

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Introduction. Midfoot dislocations are rare traumatic injuries. The best known patterns involve the Lisfranc and Chopart joints, although some other types have been described. Dislocations that occur at the level of the naviculocuneiform and calcaneocuboid joints simultaneously represent a very rare configuration of dislocation. Case Presentation. A 34-year-old man sustained a crush injury to his left foot causing a complete dislocation through the naviculocuneiform and calcaneocuboid joints. Immediate closed reduction and percutaneous pinning were performed, followed by open reduction and stabilization of both joints two weeks later. Anatomical reduction was obtained, and the clinical outcome remained satisfactory 10 months after surgery. Discussion. Anatomical reduction is essential to obtain favorable outcomes in traumatic midfoot injuries. An unusual pattern of midfoot dislocation can be treated according to the same principles as those for classical Lisfranc or Chopart injuries.

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Rauch, Edgar F., and G. Shigesato. "The Dislocation Patterns in Deformed Metals: Dislocation Densities, Distributions and Related Misorientations." Materials Science Forum 550 (July 2007): 193–98. http://dx.doi.org/10.4028/www.scientific.net/msf.550.193.

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The dislocation substructure that appears in deformed metals and alloys have been extensively investigated in the past by transmission electron microscopy (TEM). They are known to form a broad variety of microstructures. These substructures are characterized by three main parameters, namely the density of the dislocations that are trapped in the tangles, their degree of patterning and the misorientation between the cells. The aim of the present work is to investigate the relationship between these features and the mechanical properties of the material.

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Estrin, Y., H. Braasch, and Y. Brechet. "A Dislocation Density Based Constitutive Model for Cyclic Deformation." Journal of Engineering Materials and Technology 118, no. 4 (October 1, 1996): 441–47. http://dx.doi.org/10.1115/1.2805940.

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A new constitutive model describing material response to cyclic loading is presented. The model includes dislocation densities as internal variables characterizing the microstructural state of the material. In the formulation of the constitutive equations, the dislocation density evolution resulting from interactions between dislocations in channel-like dislocation patterns is considered. The capabilities of the model are demonstrated for INCONEL 738 LC and Alloy 800H.

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Moatshe, Gilbert, Grant J. Dornan, Sverre Løken, Tom C. Ludvigsen, Robert F. LaPrade, and Lars Engebretsen. "Demographics and Injuries Associated With Knee Dislocation: A Prospective Review of 303 Patients." Orthopaedic Journal of Sports Medicine 5, no. 5 (May 1, 2017): 232596711770652. http://dx.doi.org/10.1177/2325967117706521.

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Background: Information on the incidence, injury mechanisms, ligament injury patterns, and associated injuries of knee dislocations is lacking in the literature. There is a need to characterize ligament injury patterns and associated injuries in knee dislocations to avoid missing common associated diagnoses and to plan surgical treatment. Purpose: To evaluate patient demographics, ligament injury patterns and associated injury patterns, and associated injuries in patients with knee dislocation. Study Design: Cross-sectional study; Level of evidence, 3. Methods: A total of 303 patients with knee dislocations treated at a single level 1 trauma center were followed prospectively. Injury mechanism; ligament injury patterns; associated neurovascular, meniscal, and cartilage injuries; and surgical complications were recorded. The Schenck knee dislocation classification was used to classify the ligament injury patterns. Results: The mean age at injury was 37.8 ± 15.3 years. Of the 303 patients included, 65% were male and 35% were female. There was an equal distribution of high-energy and low-energy injuries. Injury to 3 major ligaments was the most common, with Schenck classification type KD III-M constituting 52.4% of the injuries and KD III-L comprising 28.1%. Meniscal injuries and cartilage injuries occurred in 37.3% and 28.3% of patients, respectively. Patients with acute injuries had significantly lower odds of a cartilage injury than those with chronic injuries (odds ratio [OR], 0.28; 95% CI, 0.15-0.50; P < .001). Peroneal nerve injuries were recorded in 19.2% of patients (10.9% partial and 8.3% complete deficit), while vascular injuries were recorded in 5%. The odds of having a common peroneal nerve injury were 42 times greater ( P < .001) among those with posterolateral corner injury (KD III-L) than those without. The odds for popliteal artery injury were 9 times greater ( P = .001) among those with KD III-L injuries than other ligament injury types. Conclusion: Medial-sided bicruciate injuries were the most common injury pattern in knee dislocations. Cartilage injuries were common in chronically treated patients. There was a significant risk of peroneal nerve injury with lateral-sided injuries.

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Hansen, N., X. Huang, W. Pantleon, and G. Winther. "Grain orientation and dislocation patterns." Philosophical Magazine 86, no. 25-26 (September 2006): 3981–94. http://dx.doi.org/10.1080/14786430600654446.

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Yang, Wei, Xiaoyi Wu, and Qiang Yang. "Scale dependence of dislocation patterns." Metals and Materials 4, no. 4 (July 1998): 968–72. http://dx.doi.org/10.1007/bf03026432.

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Kubin, L. P., and G. Canova. "The modelling of dislocation patterns." Scripta Metallurgica et Materialia 27, no. 8 (October 1992): 957–62. http://dx.doi.org/10.1016/0956-716x(92)90456-o.

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Dissertations / Theses on the topic "Dislocation patterns"

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Köhlitz, Torsten [Verfasser]. "Prevalence and patterns of anatomical risk factors in patients after patellar dislocation : a case control study using MRI / Torsten Köhlitz." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2014. http://d-nb.info/1046563548/34.

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Kacher, Joshua Peter. "Cross-Correlation-Based Texture Analysis Using Kinematically Simulated EBSD Patterns." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1746.

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The development and example applications of a new EBSD-based texture analysis system are presented. This new system uses the cross-correlation function to compare two EBSD patterns at a number of corresponding regions in each pattern to calculate the deformation gradient tensor. Bragg's Law-based simulated EBSD patterns are used as reference patterns in the cross-correlation method to enable the measurements of absolute elastic strain and lattice orientation at discrete points in a crystalline sample. The resolution limits of this new method are explored using a variety of computational and physical experiments. The simulated pattern method is estimated to be able to measure lattice orientations to within +/-0.02° and elastic strains to within +/-3.6x10-4 for small strains and +/-1x10-3 for large strains. Two example applications are demonstrated. The first demonstration is estimating the dislocation density in a 5.5% compressed Mg-based AZ91 alloy. Nye's and Kröner's formulations are used to estimate the dislocation density. Comparisons are made with traditional OIM measurements and it is found that the simulated pattern method offers an order of magnitude improvement in dislocation density estimations over OIM. The second demonstration is tetragonality measurements of HSLA 65 steel along the weld line of a friction stir welded plate. Accurate tetragonality measurements in the bainite phase of the steel can be made using information from the diagonal components of the elastic strain tensor. The measured tetragonality can be related to the concentration of interstitial carbon atoms in the iron lattice to find the carbon distribution in the sample. From these experiments, it is demonstrated that the simulated pattern method presents a new and powerful methodology for texture analysis that exhibits both ease of use and access to high resolution orientation and elastic strain data.

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Klemm, Robert. "Zyklische Plastizität von mikro- und submikrokristallinem Nickel." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2004. http://nbn-resolving.de/urn:nbn:de:swb:14-1085403884093-17423.

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Im Rahmen der vorliegenden Arbeit wurde der Einfluss der Korngröße und der Gefügestabilität auf die zyklische Plastizität von mikro- und submikrokristallinem Nickel, hergestellt durch ECAP und PED, untersucht. Zur Gefügecharakterisierung kamen verschiedene elektronenmikroskopische und röntgenographische Methoden zum Einsatz. Die Untersuchungen zur Gefügestabilität zeigten, dass (i) die Stabilität der Korn- und Substruktur bei der zyklischen Verformung empfindlich vom Gefüge im Ausgangszustand abhängt, (ii) generell die Tendenz zur Umwandlung der vorhandenen Substruktur in eine universelle ermüdungstypische Substruktur besteht, diese Transformation jedoch durch die lokale Gefügebeschaffenheit be- bzw. verhindert sein kann und (iii) zur Erklärung des Entfestigungsverhaltens der ECAP-Materialien sowohl die Transformation der Substruktur als auch die Vergröberung der Kornstruktur berücksichtigt werden müssen. Auf der Basis der Ergebnisse der vorliegenden Arbeit und unter Hinzunahme von Resultaten aus der Literatur lassen sich Schlussfolgerungen zum Einfluss der Korngröße auf die zyklische Plastizität in einem vier Größenordnungen umfassenden Korngrößenbereich ziehen. In grob- und feinkörnigem Nickel bilden sich bei der zyklischen Verformung ermüdungstypische Versetzungsstrukturen, deren Abmessungen kaum von der Korngröße abhängen. Der Versetzungslaufweg in diesen Materialien ist wesentlich kleiner als die Kornabmessungen. Dementsprechend besteht höchstens ein schwacher Einfluss der Korngröße auf das sich bei der Wechselverformung einstellende Spannungsniveau. Bei mikro- und submikrokristallinem Nickel, wo der Versetzungslaufweg in der Größenordung der Kornabmessungen liegt, wird ein deutlicher Umschlag bei der Versetzungsmusterbildung und dem zyklischen Verformungsverhalten beobachtet. In diesem Korngrößenbereich entstehen entweder qualitativ andere (D<DS1=5µm) oder keine Versetzungsstrukturen (D<DS2=1µm) und das Spannungsniveau steigt mit sinkender Korngröße entsprechend einer HALL-PETCH-Beziehung.

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Klemm, Robert. "Zyklische Plastizität von mikro- und submikrokristallinem Nickel." Doctoral thesis, Technische Universität Dresden, 2003. https://tud.qucosa.de/id/qucosa%3A23831.

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Im Rahmen der vorliegenden Arbeit wurde der Einfluss der Korngröße und der Gefügestabilität auf die zyklische Plastizität von mikro- und submikrokristallinem Nickel, hergestellt durch ECAP und PED, untersucht. Zur Gefügecharakterisierung kamen verschiedene elektronenmikroskopische und röntgenographische Methoden zum Einsatz. Die Untersuchungen zur Gefügestabilität zeigten, dass (i) die Stabilität der Korn- und Substruktur bei der zyklischen Verformung empfindlich vom Gefüge im Ausgangszustand abhängt, (ii) generell die Tendenz zur Umwandlung der vorhandenen Substruktur in eine universelle ermüdungstypische Substruktur besteht, diese Transformation jedoch durch die lokale Gefügebeschaffenheit be- bzw. verhindert sein kann und (iii) zur Erklärung des Entfestigungsverhaltens der ECAP-Materialien sowohl die Transformation der Substruktur als auch die Vergröberung der Kornstruktur berücksichtigt werden müssen. Auf der Basis der Ergebnisse der vorliegenden Arbeit und unter Hinzunahme von Resultaten aus der Literatur lassen sich Schlussfolgerungen zum Einfluss der Korngröße auf die zyklische Plastizität in einem vier Größenordnungen umfassenden Korngrößenbereich ziehen. In grob- und feinkörnigem Nickel bilden sich bei der zyklischen Verformung ermüdungstypische Versetzungsstrukturen, deren Abmessungen kaum von der Korngröße abhängen. Der Versetzungslaufweg in diesen Materialien ist wesentlich kleiner als die Kornabmessungen. Dementsprechend besteht höchstens ein schwacher Einfluss der Korngröße auf das sich bei der Wechselverformung einstellende Spannungsniveau. Bei mikro- und submikrokristallinem Nickel, wo der Versetzungslaufweg in der Größenordung der Kornabmessungen liegt, wird ein deutlicher Umschlag bei der Versetzungsmusterbildung und dem zyklischen Verformungsverhalten beobachtet. In diesem Korngrößenbereich entstehen entweder qualitativ andere (D<DS1=5µm) oder keine Versetzungsstrukturen (D<DS2=1µm) und das Spannungsniveau steigt mit sinkender Korngröße entsprechend einer HALL-PETCH-Beziehung.

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Mansour, Haithem. "Caractérisation des défauts cristallins au MEB par canalisation d’électrons assistée par diagrammes pseudo-Kikuchi haute résolution : application à l’acier IF, UO2 et TiAl." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0311/document.

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La technique Imagerie par Contraste de Canalisation d'Electron (ECCI) est utilisée en microscopie électronique à balayage (MEB) pour visualiser et caractériser des défauts cristallins tels que les dislocations. L’ECCI nécessite l'orientation, avec grande précision (meilleure que 0,1°), du cristal à analyser par rapport au faisceau d’électrons pour satisfaire les conditions très strictes de canalisation d'électrons. À cause de la limitation en résolution spatiale et angulaire des techniques actuelles permettant de déterminer l’orientation cristallographique, la caractérisation des défauts cristallins par ECCI est actuellement appliquée à des monocristaux (ou des polycristaux possédant des gros grains) et les conditions de canalisation ne sont pas toujours satisfaites. Dans ce projet de thèse, un mode de balayage Précession de faisceau (Rocking Beam en anglais) a été développé dans un microscope électronique à balayage. Il permet l’acquisition de diagrammes pseudo-Kikuchi haute résolution spatiale (500nm) et angulaire (0,04°) (High Resolution Selected Area Channeling Pattern en anglais (HR-SACP)) et de contrôler les conditions de canalisations nécessaire à l’ECCI. Ceci a permis d’améliorer considérablement la précision de l’ECCI (Accurate ECCI A-ECCI) et d’élargir son domaine d’application aux matériaux polycristallins à grains fins. Dans un deuxième temps, l’A-ECCI assistée par HR-SACP a été utilisé pour caractériser des défauts cristallins (dislocations, sous joint de grain, domaine d’ordre) dans des matériaux massifs polycristallins (Acier IF, UO2, TiAl). Des procédures similaires à celles utilisées dans la microscopie électronique en transmission (MET) sont alors appliquées en s’affranchissant de la préparation fastidieuse de lames minces et en profitant des autres avantages du MEB
Electron Channeling Contrast Imaging (ECCI) is a Scanning Electron Microscope (SEM) technique used to observe and characterize crystallographic defects. ECCI requires the crystal to be oriented relative to the electron beam with high accuracy (0.1°) in order to control the electron channeling conditions. The SEM techniques used to determine the crystallographic orientation, such as conventional Electron BackScattered Diffraction (EBSD) or Rocking Beam, don’t satisfy the high accuracy required for ECCI. Therefore, the characterization of crystallographic defects by ECCI is used only in single crystals or polycristals with large grains and channeling conditions are not always satisfied. In this thesis, a development of a new Rocking Beam mode in SEM is presented. It allows the collection of High spatial (500nm) and angular (0.04°) Resolution Selected Area Channeling Pattern (HR-SACP) and the control of channeling conditions required for ECCI with high accuracy (Accurate ECCI A-ECCI). In a second phase of this thesis, A-ECCI assisted by HR-SACP is used to characterize crystallographic defects like dislocation, sub-grains and order domains in fine grained bulk materials (IF-Steel, UO2, TiAl). In order to achieve this, several procedures (invisibility criteria) normally used in Transmission Electron Microscopy are applied. Using A-ECCI in SEM has many advantages over TEM such as the possibility of analyzing large areas and the relative easiness in sample preparation

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Books on the topic "Dislocation patterns"

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Nye, J. F. Natural focusing and fine structure of light: Caustics and wave dislocations. Bristol: Institute of Physics Pub., 1999.

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Halvorson-Taylor, Martien A. Displacement and Diaspora in Biblical Narrative. Edited by Danna Nolan Fewell. Oxford University Press, 2015. http://dx.doi.org/10.1093/oxfordhb/9780199967728.013.43.

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Deportation and migration were formative for ancient Judaism and seminal for its literature. Dislocation, whether conceived of as forced or voluntary, influenced Israel’s recollection of her more distant past. Early pre-exilic narratives of Israel’s beginnings were redacted during and in response to Israel’s experience of exile, so that, for example, earlier Abraham and Joseph traditions were reshaped drawing on the realities of the Babylonian exile and the related Diaspora; these reworked traditions, in turn, informed narratives, such as Esther and Daniel, that took exile and diaspora as their explicit subject. The stories of Israel’s origins and its accounts of post-exilic and diasporic existence exerted a reciprocal influence on each other; and thus Israelite history came to be narrated as a series of exiles and returns, in which current dislocations were understood in terms of primeval patterns, and ancestral stories were revised in light of current dislocations.

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Reidler, Jay S., Amit Jain, and A. Jay Khanna. Cervical Spine Trauma. Edited by Mehul J. Desai. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199350940.003.0007.

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This chapter discusses the diagnosis and treatment of traumatic injuries to the cervical spine. It describes key aspects of the history and physical examination when evaluating patients with suspected cervical spine injuries. Further, it outlines indications for applying cervical collars, steps involved in clearing/removing cervical collars, and recommendations for initial radiographic imaging. Neurologic injuries associated with cervical spine trauma, ranging from “stingers” to complete spinal cord injuries, are described. Common vertebral fracture and dislocation patterns are defined and organized to assist with diagnosis and treatment.

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DiGirolamo, Cara M. Word order and information structure in the Würzburg Glosses. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198747307.003.0008.

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This chapter deals with the interface between Syntax and Pragmatics by examining argument fronting in Old Irish non-poetic Glosses. Relying on lexical and contextual indicators of discourse function, three Information Structure patterns can be identified: aboutness topic; contrastive topic; and focus. Aboutness and contrastive topic are often resumed and do not mark relativization on the verb, suggesting that they are left dislocation structures. Focus is most commonly expressed through clefts, although clefts in Old Irish can be morphologically opaque. Modern Irish has all these structures besides a non-clefted focus structure, which is likely derived from interpreting morphologically opaque clefts as topicalization. In sum, this paper argues that Old Irish has a set of productive argument fronting positions with distinct and conventional information structural properties that can be analysed in terms of an articulated left periphery, and that these fronting positions are the direct ancestors of fronting positions in Modern Irish.

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Pohl, A. Dislocations of the hip and femoral head fractures. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780199550647.003.012050.

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♦ Most injuries are high violence, so look for associated injuries♦ Immediate closed reduction usually best under general anaesthetic♦ Do not proceed to open reduction without appropriate imaging studies♦ Surgical approach depends on injury pattern♦ Some long term complications can be minimized/avoided by appropriate early treatment (e.g. avascular necrosis).

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Book chapters on the topic "Dislocation patterns"

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Kubin, L. P. "Dislocation Patterns." In Computer Simulation in Materials Science, 273–90. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1628-9_16.

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Kubin, L. P., Y. Estrin, and G. Canova. "Dislocation Patterns and Plastic Instabilities." In Patterns, Defects and Materials Instabilities, 277–301. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0593-1_20.

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Walgraef, D., C. Schiller, and E. C. Aifantis. "Reaction-Diffusion Approach to Dislocation Patterns." In Patterns, Defects and Microstructures in Nonequilibrium Systems, 257–69. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3559-4_15.

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Kubin, Ladislas P. "Dislocation Patterns: Experiment, Theory and Simulation." In Stability of Materials, 99–135. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0385-5_4.

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Ghoniem, N. M., and R. J. Amodeo. "Numerical Simulation 0f Dislocation Patterns during Plastic Deformation." In Patterns, Defects and Materials Instabilities, 303–29. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0593-1_21.

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Rauch, Edgar F., and G. Shigesato. "The Dislocation Patterns in Deformed Metals: Dislocation Densities, Distributions and Related Misorientations." In Materials Science Forum, 193–98. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-434-0.193.

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Walgraef, D., and N. M. Ghoniem. "On the Growth and Form of Dislocation Patterns." In Growth and Form, 431–39. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-1357-1_38.

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Beghi, M. G., C. E. Bottani, and G. Caglioti. "Thermoelastic-Plastic Transition and Dislocation Dynamics in Metals by Deformation Calorimetry." In Patterns, Defects and Microstructures in Nonequilibrium Systems, 187–201. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3559-4_11.

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Steck, Elmar, and Hanfried W. Hesselbarth. "Simulation of Dislocation Pattern Formation by Cellular Automata." In Anisotropy and Localization of Plastic Deformation, 175–78. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3644-0_41.

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Zagórska-Marek, Beata, and Danuta Wiss. "Dislocations in the Repetitive Unit Patterns of Biological Systems." In Formal Descriptions of Developing Systems, 99–117. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0064-2_7.

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Conference papers on the topic "Dislocation patterns"

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WALGRAEF, D. "PLASTIC INSTABILITIES AND DISLOCATION PATTERNS." In Proceedings of the First Latin American Summer School. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812793317_0008.

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Hao, Su, and Hans Weertman. "A Variational Principle of Dislocations Kinetic in Crystals and a Toughening Mechanism of BCC or HCP Metals." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65605.

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A dislocation kinetics-based analysis has been carried out on the toughening mechanisms of alloys. It is concluded that both improved strength and toughening can be achieved through adjusting the short range interatomic interactions between embedded solute atoms, or other point defects, that affect Peierls-Nabarro energy barrier, and the long range interactions between dislocation loops and heterogeneities such coherent precipitates, second phase particles, and crystallography; the latter determines dislocation loops’ patterns such as kink-jog formation. In order to quantify the effects of lattice heterogeneities, a variation principle that defines the energy minima of dislocation line configuration has been derived, which includes the effects of three-dimensional stress states and crystallography, instead of the conventional line energy-based Eular formulation that only considers the case under shear stress. This provides an analytical means and associated numerical tool to determine the favorite dislocation loop’s patterns in an alloy. The further analysis reveals that double-kinks within single slip-plane have limited effect on toughening while the corresponding bow-out solution may lead to a lower-bound estimate of precipitate strengthening. Therefore, a proposed strategy for toughening is to create dispersed softening centers in strengthened matrix that trap accumulated dislocation loops in the form of mixed double-kinks and jog-induced climbings, for example, helices. These kinds of dislocation patterns are able to spread out localized dislocations from single or close packed parallel slipping planes to many cross-over planes in multiple slip-systems, so as to delay the formation of shear bands while maximize the magnitude of bowing-out induced strengthening.

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Xiaoli Lin and Tao Yang. "Formation of vertical dislocation patterns in one-dimensional computational verb cellular networks." In 2009 3rd International Conference on Anti-counterfeiting, Security, and Identification in Communication (2009 ASID). IEEE, 2009. http://dx.doi.org/10.1109/icasid.2009.5276964.

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Landau, Peri, Roni Z. Shneck, Guy Makov, and Arie Venkert. "In-Situ Observations of Dislocation Patterning in Deformed Polycrystalline Aluminum." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59595.

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The formation and evolution of dislocation patterns in pure polycrystalline aluminum was examined using transmission electron microscopy. The conventional characterization of the deformed samples was combined with in-situ tensile tests of prestrained samples which were carried out in order to get a better understanding of dislocation motion during deformation. The role of different types of boundaries was studied and it was found that while dense dislocation walls have an ordered structure since they are geometrically necessary, incidental dislocation boundaries can change their configuration from tangled to ordered.

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Shuting, Chen, Li Lihong, Du Anyan, and Hua Younan. "Study of Si Crystal Defects by Chemical Preferential Etching and Its Application on Si Dislocation Defects Caused by Laser Spike Annealing (LSA)." In ISTFA 2012. ASM International, 2012. http://dx.doi.org/10.31399/asm.cp.istfa2012p0293.

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Abstract In this work, delineation of crystal defects in Si by preferential chemical etching (Wright etch) is discussed. Investigation of defects in Si wafers by preferential chemical etching enables the study of various types of crystal defects for large area defect distribution (up to full wafer) and root cause analysis. In the case of dislocation defects, the shapes of etch pits are different for different etching duration. We show the mechanism of the pit shape evolution under preferential etching and suggested the appropriate etching duration for defect type identification with inspection by optical microscopes. The dislocation delineation method has been applied to a case of functional failure of devices caused by abnormal process in Laser Scanning Annealing (LSA). It was shown that the distribution of dislocation defects depends largely on the direction of LSA scan direction. We discuss the relationship between dislocation defect distribution and the density and uniformity of the active-Si patterns as well as possible solutions for elimination of dislocation defects in LSA process.

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Franz, Gérald, Farid Abed-Meraim, Tarak Ben Zineb, Xavier Lemoine, and Marcel Berveiller. "A Multiscale Model Based On Intragranular Microstructure — Prediction Of Dislocation Patterns At The Microscopic Scale." In 10TH ESAFORM CONFERENCE ON MATERIAL FORMING. AIP, 2007. http://dx.doi.org/10.1063/1.2729486.

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Saha, Sourabh K., and Martin L. Culpepper. "Predicting the Quality of One-Dimensional Periodic Micro and Nano Structures Fabricated via Wrinkling." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87081.

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Wrinkling of thin films due to buckling-based surface instabilities is a fast and inexpensive technique for template-free fabrication of periodic micro/nano scale structures. Although one-dimensional (1-D) periodic micro and nano structures have been fabricated via wrinkling in the past, wrinkling is not yet appropriate for a manufacturing environment. This is because it is currently not possible to predict and control the quality of the fabricated patterns. Pattern quality is quantified in terms of the uniformity of the pattern, i.e., defect density within the patterned area. Herein, we (i) identify the process parameters that affect pattern quality, (ii) model the effect of these parameters on wrinkling quality and (iii) quantify the feasible operating region for a target pattern quality. During wrinkling, dislocation defects are observed due to local geometric imperfections such as voids or variations in the material properties. We have developed a finite element model of the wrinkling process that accounts for voids in the material. The wavelength and amplitude predictions of this model were found to be within ∼13% of the experimental observations. Also, it was found that below a threshold void size, the non-uniformity in the pattern due to voids decays with an increase in the applied compressive strain. This provides a practical means to minimize the non-uniformity in 1-D wrinkled patterns by increasing the compression. However, the defect density due to surface cracks increases with an increase in the compressive strains. Our analysis enables one to identify and predict the feasible operating region within which uniform 1-D patterns can be obtained, thereby improving manufacturability via wrinkling.

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Taylor, Curtis, Eric Stach, Gregory Salamo, and Ajay Malshe. "Nanoindentation Assisted Self-Assembly of Quantum Dots." In ASME 2006 International Manufacturing Science and Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/msec2006-21139.

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The ability to pattern quantum dots with high spatial positioning and uniform size is critical for the realization of future electronic devices with novel properties and performance that surpass present technology. This work discusses the exploration of an innovative nanopatterning technique to direct the self-assembly of nanostructures. The technique focuses on perturbing surface strain energy by nanoindentation in order to mechanically bias quantum dot nucleation. Growth of InAs quantum dots on nanoindent templates is performed using molecular beam epitaxy (MBE). The effect of indent spacing and size on the patterned growth is investigated. The structural analysis of the quantum dots including spatial ordering, size, and shape are characterized by ex-situ atomic force microscopy (AFM). Results reveal that the indent patterns clearly bias nucleation with dot structures selectively growing on top of each indent. It is speculated that the biased nucleation is due to a combination of favorable surface strain attributed to subsurface dislocation strain fields and/or multi-atomic step formation at the indent sites, which leads to increased adatom diffusion on the patterned area.

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Spiliotis, Konstantinos G., Lucia Russo, and Elias C. Aifantis. "The effect of the diffusion on the bifurcation behavior of dislocation patterns in the one-dimensional finite domain." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2015 (ICNAAM 2015). Author(s), 2016. http://dx.doi.org/10.1063/1.4951931.

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Sui, Dan, and John E. Huber. "Modelling of Needle Domains in Barium Titanate Single Crystals Using Dislocation Theory." In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-8033.

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A model is established to study needle domains in barium titanate single crystals using the theory of dislocations. Considering the mechanical and electrical compatibility in ferroelectrics, the fields produced by a needle domain are represented using the equivalent fields due to an effective edge dislocation coupled with a line charge. Accordingly, the dislocation fields derived by Barnett and Lothe for anisotropic piezoelectric media are used to analyze the stress and electric fields around needle domains. The interaction of the pairs of needle domains in an infinite piezoelectric body is studied by computing the interactive force and the total energy. It is found that the needle tip interactions tend to be dominated by the electrostatic terms. Additionally, comb-like arrays of needle domains are investigated. Stable configurations of needle domains in a herringbone pattern are identified, consistent with experimental evidence. However, comb-like arrays of needles are found to be unstable if perfectly insulating conditions without lattice friction are assumed.

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