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Artykuły w czasopismach na temat „Dislocation”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Shetty, Sanath Kumar, Lawrence J. Mathias, H. Ravindranath Rai, P. Nirmal Babu, Raj Sankar N. R., and Vinay Kumar C. "SIMULTANEOUS BILATERAL ANTERIOR DISLOCATION OF THE SHOULDER WITH FRACTURES OF THE GREATER TUBEROSITY FOLLOWING TRAUMA- A CASE REPORT." Journal of Health and Allied Sciences NU 04, no. 01 (2014): 129–30. http://dx.doi.org/10.1055/s-0040-1703750.

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Abstract:Simultaneous bilateral shoulder dislocations are usually posterior with anterior dislocations1 being rare and simultaneous anterior shoulder dislocations with fractures of the greater tuberosity5 being even more rare usually associated with trauma or seizures2,3 . Here we present a rare case of simultaneous bilateral anterior dislocation of the shoulder with fractures of the greater tuberosity following an unusual injury mechanism which was treated surgically.

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2

Wang, Xiaona, Haibin Zhang, Shinong Yan, et al. "The Response Mechanism of Crystal Orientation to Grain Boundary Dislocation under Uniaxial Strain: A Phase-Field-Crystal Study." Metals 12, no. 5 (2022): 712. http://dx.doi.org/10.3390/met12050712.

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An exploration of dislocation microstructure evolution with different misorientation angles was performed using phase field crystal method (PFC). The microcosmic evolution process of grain boundaries under external stress, as well as the corresponding energy curve and stress–strain curve, are analyzed. The relationship between the misorientation angle and the dislocations emission frequency is discussed. Three forms of dislocations reaction on the evolution process of 6°and 10° are analyzed in detail, which are respectively type I semi-annihilation, type II semi-annihilationand full-annihilati

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3

Li, Yon Gan, Xiang Qian Xiu, Xue Mei Hua, et al. "Study of Dislocation Densities of Thick GaN Films." Advanced Materials Research 989-994 (July 2014): 387–90. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.387.

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The dislocation density of GaN thick films has been measured by high-resolution X-ray diffraction. The results show that both the edge dislocations and the screw dislocation reduce with increasing the GaN thickness. And the edge dislocations have a larger fraction of the total dislocation densities, and the densities for the edge dislocation with increasing thickness reduce less in contrast with those for the screw dislocation.

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4

Petelina, Yulia, Svetlana Kolupaeva, Konstantin A. Polosukhin, and Aleksander Petelin. "Influence of the Dislocation Density on the Expansion Dynamics of the Crystallographic Slip Zone along Screw Orientations in Aluminum and Copper." Key Engineering Materials 683 (February 2016): 136–41. http://dx.doi.org/10.4028/www.scientific.net/kem.683.136.

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Crystallographic slip is one of key mechanisms determining plastic form change of crystalline solids. Despite a large amount of works done on the subject, crystallographic slip is a very difficult subject to study. Significant progress in the study of the crystallographic slip process is possible only with the use of a set of different methods: experimental methods, methods of mathematical modeling and simulation. The paper presents a modification mathematical expansion model of closed dislocations emitted by one dislocation source with takes into account the elastic interaction force among al

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5

Takaki, Setsuo, Y. Fujimura, Koichi Nakashima, and Toshihiro Tsuchiyama. "Effect of Dislocation Distribution on the Yielding of Highly Dislocated Iron." Materials Science Forum 539-543 (March 2007): 228–33. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.228.

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Yield strength of highly dislocated metals is known to be directly proportional to the square root of dislocation density (ρ), so called Bailey-Hirsch relationship. In general, the microstructure of heavily cold worked iron is characterized by cellar tangled dislocations. On the other hand, the dislocation substructure of martensite is characterized by randomly distributed dislocations although it has almost same or higher dislocation density in comparison with heavily cold worked iron. In this paper, yielding behavior of ultra low carbon martensite (Fe-18%Ni alloy) was discussed in connection

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6

Pande, Chandra S., and Ramasis Goswami. "Dislocation Emission and Crack Dislocation Interactions." Metals 10, no. 4 (2020): 473. http://dx.doi.org/10.3390/met10040473.

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An understanding of the crack initiation and crack growth in metals spanning the entire spectrum of conventional and advanced has long been a major scientific challenge. It is known that dislocations are involved both in the initiation and propagation of cracks in metals and alloys. In this review, we first describe the experimental observations of dislocation emission from cracks under stress. Then the role played by these dislocations in fatigue and fracture is considered at a fundamental level by considering the interactions of crack and dislocations emitted from the crack. We obtain precis

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7

Gulbrandsen, Matthew T., Jill G. Putnam, J. Tracy Watson, and Michael D. McKee. "Irreducible Volar DRUJ Dislocation with Distal Radius Fracture Dislocation." Journal of Wrist Surgery 09, no. 02 (2019): 156–59. http://dx.doi.org/10.1055/s-0039-1692476.

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Abstract Background Volar dislocations of the distal radioulnar joint (DRUJ) are rare and often missed during initial evaluation. Chronic dislocations and disability can occur when DRUJ dislocations are unrecognized and not reduced. DRUJ dislocations often occur with other wrist injuries, which may complicate reduction. Closed reduction can fail to reduce DRUJ dislocations, in which case open reduction is necessary. Case Description This case describes a patient who had a volar dislocation of the DRUJ with an associated dorsal distal radius fracture dislocation. Initial attempts at closed redu

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8

Wang shumin, He Xinfu, and Dou Yankun. "Simulation Study on Edge Dislocation Motion and Its Interaction with Dislocation Loop in Pure V and TiVTa Alloy." Acta Physica Sinica 74, no. 7 (2025): 0. https://doi.org/10.7498/aps.74.20241757.

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In this paper, the motion of edge dislocations and the interaction between edge dislocations and dislocation loops in pure V and TiVTa alloy were simulated. The aim was to reveal the influence of the existence of <111> dislocation loops, which are dominant in pure V, and <100> dislocation loops, which are dominant in TiVTa alloy, on the irradiation properties of materials and the differences between the irradiation properties influenced by the two types of dislocation loops. Edge dislocations and <100> loops and <111> loops with different sizes were introduced into pure

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9

Lauer, Kevin, Martin Herms, Anett Grochocki, and Joachim Bollmann. "Iron Gettering at Slip Dislocations in Czochralski Silicon." Solid State Phenomena 178-179 (August 2011): 211–16. http://dx.doi.org/10.4028/www.scientific.net/ssp.178-179.211.

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The impact of slip dislocations on the interstitial iron distribution in as-grown CZ silicon wafers is investigated by calibrated MWPCD excess charge carrier lifetime measurements, DLTS measurements and measurements of the dislocation density. In regions of high dislocation density low interstitial iron content as well as low lifetime is observed. A linear correlation between dislocation density and interstitial iron content is found. We explain this linear correlation by the thesis that slip dislocations are 60° dislocations, which have adsorbed one iron atom at each dangling bond along the d

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10

Suresh, T. V., D. Naveen, K. Harish, and Ravi M. Daddimani. "Bilateral Asymmetrical Hip Dislocation in a 70-year-old Female: A Rare Case Report." Journal of Orthopedics, Traumatology and Rehabilitation 16, no. 2 (2024): 191–94. https://doi.org/10.4103/jotr.jotr_9_23.

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Abstract Traumatic dislocation of the hip joint is a rare injury representing 2%–5% of all dislocations while bilateral hip dislocation accounts for 1.25% of all hip dislocations. Asymmetrical hip dislocations are even rarer accounting for approximately 0.01%–0.02% of all hip joint dislocations. We are reporting a case of bilateral asymmetrical hip dislocations with left-sided posterior dislocation and right anterior dislocation in a 70-year-old female following a road traffic accident. It is pertinent to thoroughly evaluate the patient on the Advanced Trauma Life Support guidelines. After eva

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11

Kang, Junyong, Shin Tsunekawa, and Atsuo Kasuya. "Dislocations around precipitates in AlGaN epilayers." Journal of Materials Research 17, no. 8 (2002): 2007–11. http://dx.doi.org/10.1557/jmr.2002.0297.

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Dislocations around precipitates in undoped AlGaN were investigated by transmission electron microscopy. The dislocation images were taken under different diffraction conditions. The dislocations are classified into two types, a pure edge dislocation loop and a close-;coiled helical dislocation. Both types of dislocations were found to depend on the shape and size of the precipitate sources. It is suggested that the pure edge dislocation loop results from homogeneous shear stress and the close-;coiled helical dislocation is caused by spherically symmetrical stress concentration at round ends o

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12

Shen, Yixi, and Douglas E. Spearot. "Mobility of dislocations in FeNiCrCoCu high entropy alloys." Modelling and Simulation in Materials Science and Engineering 29, no. 8 (2021): 085017. http://dx.doi.org/10.1088/1361-651x/ac336a.

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Abstract Dislocations in high entropy alloys (HEAs) are wavy and have natural pinning points due to the variable chemical and energetic landscape surrounding the dislocation core. This can influence the critical shear stress necessary to initiate dislocation motion and the details associated with sustained dislocation glide. The objective of this work is to determine the relationship between Schmid shear stress and dislocation velocity in single phase FCC FeNiCrCoCu HEAs using molecular dynamics simulations, with comparisons made to dislocation motion in homogeneous Ni and Cu. Simulations are

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13

Su, Wen, Kai Ye, and Jingbo Liu. "Hydrolytic weakening of jadeite in UHP jadeite-quartzites from the Dabie Mountains, eastern China." Mineralogical Magazine 70, no. 5 (2006): 509–15. http://dx.doi.org/10.1180/0026461067050354.

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AbstractDeformed jadeite grains in the UHP jadeite-quartzites from the Dabie Mountains, eastern China show evidence (by transmission electron microscopy, TEM) of plastic deformation: free dislocations, dislocation loops, dislocation networks, dislocation arrays and regularly spaced subgrain boundaries by dislocation walls. Electron energy-loss spectroscopy and TEM studies reveal the existence of water-rich bubbles within dislocations and imply a relationship with water-defect dislocation by water weakening in the jadeites. These observations suggest that the water-rich bubbles are a major weak

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14

Hirth, John P. "Fine-scale structural defects in dislocation cores." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 446–47. http://dx.doi.org/10.1017/s0424820100175363.

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We are now entering what one might consider the third phase of study of dislocations by transmission electron microscopy (TEM). The first phase, in the 1950’s and 1960’s led to classifications of dislocation behavior, concepts of low angle boundaries, equilibrium nodes, and dislocation extension, for example. The second, with the advent of the weak-beam technique, produced improved estimates of stacking fault energy on the basis of dislocation extension, revealed more types of extended dislocation configurations, particularly in ordered intermetallic compounds and inorganic compounds, and reve

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15

Huang, C. C., C. C. Yu, and Sanboh Lee. "The behavior of screw dislocations dynamically emitted from the tip of a surface crack during loading and unloading." Journal of Materials Research 10, no. 1 (1995): 183–89. http://dx.doi.org/10.1557/jmr.1995.0183.

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The behavior of screw dislocations dynamically emitted from the tip of a surface crack during loading and unloading has been investigated using a discrete dislocation model. The critical stress intensity factor at the crack tip for dislocation emission is a function of friction stress, core radius of dislocation, and dislocations near the crack tip. During motion, the velocity of dislocation is assumed to be proportional to the effective shear stress to the third power. The effect of crack length and friction stress on dislocation distributions, plastic zone, and dislocation-free zone during l

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16

Lv, Xin, and Guan-Ting Liu. "Exact Solutions for Interaction of Parallel Screw Dislocations with a Wedge Crack in One-Dimensional Hexagonal Quasicrystal with Piezoelectric Effects." Mathematical Problems in Engineering 2020 (May 29, 2020): 1–15. http://dx.doi.org/10.1155/2020/4797413.

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The purpose of this paper is to consider the interaction between many parallel dislocations and a wedge-shaped crack and their collective response to the external applied generalized stress in one-dimensional hexagonal piezoelectric quasicrystal, employing the complex variable function theory and the conformal transformation method; the problem for the crack is reduced to the solution of singular integral equations, which can be further reduced to solving Riemann–Hilbert boundary value problems. The analytical solutions of the generalized stress field are obtained. The dislocations are subject

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17

Lazar, Markus. "The gauge theory of dislocations: a uniformly moving screw dislocation." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 465, no. 2108 (2009): 2505–20. http://dx.doi.org/10.1098/rspa.2009.0043.

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In this paper, we present the equations of motion of a moving screw dislocation in the framework of the translation gauge theory of dislocations. In the gauge field theoretical formulation, a dislocation is a massive gauge field. We calculate the gauge field theoretical solutions of a uniformly moving screw dislocation. We give the subsonic and supersonic solutions. Thus, supersonic dislocations are not forbidden from the field theoretical point of view. We show that the elastic divergences at the dislocation core are removed. We also discuss the Mach cones produced by supersonic screw disloca

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18

Fan, Shizhao, Rong Liu, Yingnan Huang, et al. "Observation of threading dislocations and misfit dislocation half-loops in GaN/AlGaN heterostructures grown on Si using electron channeling contrast imaging." Journal of Applied Physics 132, no. 10 (2022): 105302. http://dx.doi.org/10.1063/5.0102373.

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We implemented invisibility criterion and black–white contrast orientation analysis into low-tilt electron channeling contrast imaging (ECCI) for dislocation-type discrimination in GaN and AlGaN layers grown on a Si(111) substrate. Our ECCI and x-ray diffraction (XRD) analysis attained consistent threading dislocation densities for GaN and AlGaN grown on Si, but demonstrated drastic discrepancy in the percentage of edge-type dislocations, potentially due to the lack of appropriate consideration of mixed-type [Formula: see text] dislocations in XRD. Further ECCI analysis of GaN/AlGaN heterointe

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19

Holec, David, and Antonín Dlouhý. "Stability and Motion of Low Angle Dislocation Boundaries in Precipitation Hardened Crystals." Materials Science Forum 482 (April 2005): 159–62. http://dx.doi.org/10.4028/www.scientific.net/msf.482.159.

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The present study investigates stability and motion of low angle dislocation boundaries in an array of precipitates. The model considers discrete dislocations and precipitates that are treated as impenetrable particles. Peach-Koehler forces, which originate due to the combined effect of dislocation-dislocation interactions and the applied stress, act the individual dislocations on. Both, the dislocation glide and the dislocation climb at elevated temperatures are taken into account. Results of the numerical study suggest that a critical applied shear stress (CASS) always exists which separates

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20

Siddiqui, NA, and SP Sarkar. "Isolated Dorsal Dislocation of the Lunate." Open Orthopaedics Journal 6, no. 1 (2012): 531–34. http://dx.doi.org/10.2174/1874325001206010531.

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Lunate dislocations are well described in the volar direction as part of the perilunate dislocation, sometimes together with fractures of the other carpal bones or distal radius, as described by the anatomical studies of Mayfield [1]. It is a result of disruption of the complex inter-carpal and radiocarpal ligaments that hold the well conforming carpus in their normal position. Given the strength of these structures a significant trauma is required to cause them to fail. However, we present a case of a patient who not only presented with relatively trivial trauma that resulted in a lunate disl

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21

Kim, Hyojung, Alexandra Zimmerman, Irene J. Beyerlein, and Abigail Hunter. "Phase field modeling of dislocations and obstacles in InSb." Journal of Applied Physics 132, no. 2 (2022): 025702. http://dx.doi.org/10.1063/5.0092285.

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We present a phase-field dislocation dynamics (PFDD) model informed by first-principle calculations to elucidate the competitive dislocation nucleation and propagation between the glide and shuffle sets in InSb diamond cubic crystal. The calculations are directly informed with generalized stacking fault energy curves on the (111) slip plane for both the “glide set,” with the smaller interplanar spacing, and the “shuffle set,” with the larger interplanar spacing. The formulation also includes elastic anisotropy and the gradient term associated with the dislocation core. The PFDD calculations sh

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22

Xu, Ruida, Ying Li, and Huichen Yu. "Creep Behavior and Deformation Mechanism of a Third-Generation Single Crystal Ni-Based Superalloy at 980 °C." Metals 13, no. 9 (2023): 1541. http://dx.doi.org/10.3390/met13091541.

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As the primary choice for aero-engine turbine blades, creep resistance is an important mechanical property for the developing third-generation single crystal Ni-based superalloys. The creep behavior of the superalloy in the [001] orientation was studied at 980 °C under a series of stress levels, accompanied with scanning electron microscope (SEM) and transmission electron microscope (TEM) observation to investigate the microstructure and deformation mechanism. The deformation mechanism of the alloy is found to be dislocation gliding, propagating and forming a dislocation network in the γ/γ′ in

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23

Yakimov, Eugene B. "EBIC Investigations of Deformation Induced Defects in Si." Solid State Phenomena 131-133 (October 2007): 529–34. http://dx.doi.org/10.4028/www.scientific.net/ssp.131-133.529.

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Calculation of relation between the EBIC contrast and the recombination strength for dislocations and quasi-two-dimensional dislocation trails has been carried out taking into account the real values of depletion region width. Using the relations obtained the linear defect density along dislocations and sheet density in dislocation trails are estimated. The results of EBIC investigations of dislocations and dislocation trails in plastically deformed n- and p-Si are analyzed.

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24

Lazar, Markus. "Incompatible strain gradient elasticity of Mindlin type: screw and edge dislocations." Acta Mechanica 232, no. 9 (2021): 3471–94. http://dx.doi.org/10.1007/s00707-021-02999-2.

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AbstractThe fundamental problem of dislocations in incompatible isotropic strain gradient elasticity theory of Mindlin type, unsolved for more than half a century, is solved in this work. Incompatible strain gradient elasticity of Mindlin type is the generalization of Mindlin’s compatible strain gradient elasticity including plastic fields providing in this way a proper eigenstrain framework for the study of defects like dislocations. Exact analytical solutions for the displacement fields, elastic distortions, Cauchy stresses, plastic distortions and dislocation densities of screw and edge dis

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25

Hardy, Alexandre, Vincent Sabatier, Pierre Laboudie, et al. "Outcomes After Latarjet Procedure: Patients With First-Time Versus Recurrent Dislocations." American Journal of Sports Medicine 48, no. 1 (2019): 21–26. http://dx.doi.org/10.1177/0363546519879929.

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Background: The preoperative number of dislocations has been previously proved to be a major factor influencing the results after Bankart repair with more preoperative dislocations correlated with higher recurrence rates and more reoperations. This could possibly be because of the lower quality of the tissue repaired during the procedure after multiple dislocations. On the other hand, the Latarjet procedure does not “repair” but rather reconstructs and augments the anterior glenoid. Purpose/Hypothesis: The main objective was to report the clinical outcomes of patients undergoing a Latarjet pro

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26

Sarafanov, G. F. "INSTABILITY IN A DISLOCATION ENSEMBLE AT PLASTIC DEFORMATION IN METALS." Problems of strenght and plasticity 83, no. 2 (2021): 198–206. http://dx.doi.org/10.32326/1814-9146-2021-83-2-198-206.

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A problem related to the development of instability of a homogeneous state in an ensemble of screw dislocations under plastic deformation of metals is considered . The study of the development of instability and structure formation in the dislocation ensemble is carried out on the basis of the method developed for charged particles in plasma and associated with the correlation interaction of electrons and positively charged ions. Accordingly, the screw dislocation ensemble is represented as a system of dislocations with an opposite Burgers vector, i.e., as a plasma-like medium with opposite di

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27

Wang, Wen, Dan Wang, and Fu Sheng Han. "Mechanical Behavior of Twinning Induced Plasticity Steel Processed by Warm Forging and Annealing." Defect and Diffusion Forum 385 (July 2018): 21–26. http://dx.doi.org/10.4028/www.scientific.net/ddf.385.21.

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The present study shows that warmly forged and low-temperature annealed twinning induced plasticity (TWIP) steel exhibited very high dislocation density and apparent yield-point phenomenon in addition to very high yield strength. The initial density of dislocations significantly affected the evolution of dislocations during the subsequent tensile deformation. Original high dense dislocations prompted the rapid increase of dislocations, and intensified the complexity of dislocation configurations. All these effects made the twinning deformation weakened but the dislocation deformation enhanced,

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Fan, Qi, Xiaoyan Han, Xiangjia Zhu, et al. "Clinical Characteristics of Intraocular Lens Dislocation in Chinese Han Populations." Journal of Ophthalmology 2020 (April 27, 2020): 1–8. http://dx.doi.org/10.1155/2020/8053941.

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Purpose. To investigate the clinical characteristics of patients with intraocular lens (IOL) dislocation after IOL implantation in Chinese Han populations. Methods. The medical records of patients with IOL dislocation were retrospectively reviewed from January 2007 to December 2017, and a total of 312 patients (male: 231, female: 97) (328 eyes) were included in this study. The axial length (AL), IOL power, and the time interval between cataract surgery and IOL dislocation as well as the ocular conditions associated with IOL dislocation were recorded. The IOL dislocation was classified and grad

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Zhang, Meng Qi, and Shan Wu Yang. "Analysis and Calculation of the Strain Field Disturbance Caused by Dislocation Migration." Applied Mechanics and Materials 481 (December 2013): 212–16. http://dx.doi.org/10.4028/www.scientific.net/amm.481.212.

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In order to elucidate the different characters of elastic waves caused respectively by screw and edge dislocation movement, we calculated the stain field disturbance caused by migration of dislocation by elastic theory. Through the calculation, it was found that the strain field disturbance resulted from screw dislocation migration produces a transverse wave radiation while that resulted from edge dislocation migration produces transverse wave and longitudinal wave simultaneously. The result reveals the different energy radiation characters of screw dislocations and edge dislocations and expla

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Suzuki, Ryo, Marina Abe, Kenichi Kojima, and Masaru Tachibana. "Identification of grown-in dislocations in protein crystals by digital X-ray topography." Journal of Applied Crystallography 54, no. 1 (2021): 163–68. http://dx.doi.org/10.1107/s1600576720015356.

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X-ray topography is a useful and nondestructive method for direct observation of crystal defects in nearly perfect single crystals. The grown-in dislocations from the cross-linked seed crystal in tetragonal hen egg-white lysozyme crystals were successfully characterized by digital X-ray topography. Digital X-ray topographs with various reflections were easily obtained by reconstruction of sequential rocking-curve images. The Burgers vector of the dislocation is different from those reported previously. Interestingly, one of the dislocations had a bent shape. The preferred direction of the disl

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Myasoedov A.V., Pavlov I. S., Pechnikov A. I., Stepanov S.I. та Nikolaev V. I. "Defect structure of α-Ga-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- film grown on a m-face sapphire substrate, according to transmission electron microscopy investigation". Technical Physics Letters 49, № 1 (2023): 67. http://dx.doi.org/10.21883/tpl.2023.01.55353.19365.

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The results of a study by transmission electron microscopy of the structural state of α-Ga2O3 film with a thickness of about 1 micron, grown on the prismatic m-face sapphire by the method of chloride vapor phase epitaxy, are presented. The influence of the substrate orientation on the formation of the dislocation structure is discussed. Threading dislocations, including those with the Burgers vector 1/3&lt; 1120 &gt;, and dislocation half-loops are revealed. The inclined propagation of dislocations and the formation of dislocation half-loops result in the reduction of the threading dis

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Botros, K. Z., and S. S. Sheinin. "A method for avoiding errors in measurements of dislocation density in specimens with a high dislocation density." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 2 (1992): 1458–59. http://dx.doi.org/10.1017/s0424820100131929.

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The measurement of dislocation density from electron microscope images of dislocations is an important tool in the hands of the materials scientist. Weak beam images are often chosen for this purpose. In cases where the dislocation density is high, there is a strong possibility that the imaging electrons propagating through the thin foil would encounter several dislocations before emerging from the bottom surface. A question which arises is what effect this may have on image contrast and whether this affects measurements of dislocation density.The authors of this paper have addressed this ques

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Shikata, Shinichi, and Naoya Akashi. "Dislocation Vector Analysis Method of Deep Dislocation Having C-Axis Segment in Diamond." Materials Science Forum 1004 (July 2020): 519–24. http://dx.doi.org/10.4028/www.scientific.net/msf.1004.519.

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X-ray topography is an effective tool to investigate dislocations in semiconductor crystals. Due to low X-ray absorption coefficients of diamond, X-rays can penetrate deep into the crystal. Thus, deep three-dimensional (3D) dislocations are projected on two-dimension (2D) film, which makes dislocation analysis particularly challenging. Dislocation vectors from the films obtained using a set of the same diffraction vectors were identified using topographical and geometrical analyses. The depth and position of the dislocations in a crystal that was projected on a film were determined using geome

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Qi, Yajuan, Hailong He, and Meng Xiao. "Manipulation of acoustic vortex with topological dislocation states." Applied Physics Letters 120, no. 21 (2022): 212202. http://dx.doi.org/10.1063/5.0095543.

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Higher-order topological insulators as an exotic type of topological phases harboring fascinating topological corner or hinge states have attracted extensive attention recently. Dislocations are crystallinity-breaking defects in lattices that cannot be removed by local deformations due to nontrivial real-space topology. It is recently realized that dislocations can be used as a probe for higher-order topology. In this work, we propose a scheme to obtain acoustic dislocation states by introducing screw dislocations into higher-order topological insulators in a Kagome lattice. The topological di

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Yuan, Shao Qiang, and Xiao Juan Zhang. "Evolution in Dislocation Configuration of Deformed Fe-40Ni-Ti Alloy during Isothermal Relaxation." Key Engineering Materials 609-610 (April 2014): 515–20. http://dx.doi.org/10.4028/www.scientific.net/kem.609-610.515.

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The thermo-simulation test and transmission electron microscopy (TEM) were applied to investigate the evolution of dislocation configuration and strain induced precipitation behavior during relaxation at 850°C in a deformed Fe-40Ni-Ti alloy. The stress relaxation curve can be divided into three stages, namely, the process of incubation, nucleation and growth, and the coarsening of strain-induced precipitates. The highly dense and twisted dislocations formed during the deformation develop into dislocation cells and finally, the sub-grains can be observed when relaxing to 1000s. The strain induc

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Berezin, P. A., S. V. Bragina, and A. L. Petrushin. "Traumatic Hip Dislocation: Lecture." Traumatology and Orthopedics of Russia 27, no. 2 (2021): 156–69. http://dx.doi.org/10.21823/2311-2905-2021-27-2-156-169.

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Traumatic hip dislocations occupy the fourth place among dislocations of various localizations and, as a rule, are the result of exposure to a high-energy traumatic agent. Such injuries are more often observed in young and middle-aged males. The main cause of hip dislocations is road accidents. The femoral head is more often dislocated posteriorly, but anterior dislocations are not casuistic and account for approximately 10%. Hip dislocations are often combined with acetabular fractures, while their fairly clear clinical picture in the presence of fractures can be leveled. Traumatic hip disloc

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Mughrabi, Haël. "On the dislocation mechanisms of dynamic strain ageing in fatigued plain carbon steels." International Journal of Materials Research 94, no. 5 (2003): 471–77. http://dx.doi.org/10.1515/ijmr-2003-0085.

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Abstract The fatigue life of plain ferritic carbon steels fatigued in stress-controlled (plastic-strain-controlled) tests exhibits a maximum (minimum) at a temperature of approx. 300 °C as a result of dynamic strain ageing (DSA). In the regime of DSA, an enhanced cyclic hardening related to an increased dislocation density is observed, and the dislocation arrangement changes from a dislocation cell structure (at intermediate stress amplitudes) at room temperature to a dense edge di-/multipolar bundle/wall/vein structure in the temperature range of DSA and back to a dislocation cell/ subgrain s

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Ibrahim, Halil Kafadar. "Case Report: Floating Elbow with Posterior Shoulder Dislocation." Open Journal of Orthopedics and Rheumatology 2, no. 1 (2017): 015–17. https://doi.org/10.17352/pjor.000009.

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Shoulder dislocations are the most common joint dislocations (%50). Only 2 to 4 percent of these dislocations are posterior dislocations. Posterior dislocation of the shoulder is a rare and commonly missed injury. Also, combination of the fracture of the humerus with shoulder dislocation is a very rare injury [1-6].

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Kovacevic, Maksim, Marijana Kovacevic, Sanja Maric, Nenad Lalovic, Milivoje Dostic, and Vjeran Saratlic. "Our results in the treatment of tarsal dislocations." Srpski arhiv za celokupno lekarstvo 148, no. 9-10 (2020): 554–59. http://dx.doi.org/10.2298/sarh191105034k.

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Introduction/Objective. Tarsal dislocations are rare injuries. Usually, they are caused by high-energy trauma. Depending on the type of dislocation, surgical treatment or closed reduction is used. In this study, 13 patients are presented with the aim to analyze the type of feet dislocations, their treatment, and outcome. Methods. Tarsal dislocation cases treated in the University Hospital in Foca were analyzed during the period 2009?2016. All the cases were clinically and radiographically examined and monitored on control examinations at least three years. The mobility of joints was measured a

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Trushin, Maxim, O. F. Vyvenko, Teimuraz Mchedlidze, Oleg Kononchuk, and Martin Kittler. "Electronic States of Oxygen-Free Dislocation Networks Produced by Direct Bonding of Silicon Wafers." Solid State Phenomena 156-158 (October 2009): 283–88. http://dx.doi.org/10.4028/www.scientific.net/ssp.156-158.283.

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The results of experimental investigations of the dislocation-related DLTS-peaks originated from the dislocation networks (DN) are presented. Samples with DNs were produced by direct bonding of p-type silicon wafers and no enhancement of oxygen concentration was detected near the DN plane. Origins of the DLTS peaks were proposed and a correlation with the dislocation-related photoluminescence data was established based on known dislocation structure of the samples. Two types of shallow DLTS peaks exhibited Pool-Frenkel effect, which could be linked to the dislocation deformation potential. One

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Lyu, Dandan, and Shaofan Li. "Recent developments in dislocation pattern dynamics: Current opinions and perspectives." Journal of Micromechanics and Molecular Physics 03, no. 03n04 (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-period

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Christensen, Tyson C., Thomas L. Sanders, Ayoosh Pareek, Rohith Mohan, Diane L. Dahm, and Aaron J. Krych. "Risk Factors and Time to Recurrent Ipsilateral and Contralateral Patellar Dislocations." American Journal of Sports Medicine 45, no. 9 (2017): 2105–10. http://dx.doi.org/10.1177/0363546517704178.

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Background: Previous studies have reported variable rates of recurrent lateral patellar instability mainly because of limited cohort sizes. In addition, there is currently a lack of information on contralateral patellar instability. Purpose: To evaluate the rate of recurrent ipsilateral patellar dislocations and contralateral patellar dislocations after a first-time lateral patellar dislocation. Additionally, risk factors associated with recurrent dislocations (ipsilateral or contralateral) and time to recurrence were investigated. Study Design: Cohort study; Level of evidence, 3. Methods: Thi

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Cai, Minglei, Tedi Kujofsa, Xinkang Chen, Md Tanvirul Islam, and John E. Ayers. "Interaction Length for Dislocations in Compositionally-Graded Heterostructures." International Journal of High Speed Electronics and Systems 27, no. 03n04 (2018): 1840022. http://dx.doi.org/10.1142/s0129156418400220.

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Several simple models have been developed for the threading dislocation behavior in heteroepitaxial semiconductor materials. Tachikawa and Yamaguchi [Appl. Phys. Lett., 56, 484 (1990)] and Romanov et al. [Appl. Phys. Lett., 69, 3342 (1996)] described models for the annihilation and coalescence of threading dislocations in uniform-composition layers, and Kujofsa et al. [J. Electron. Mater., 41, 2993 (2013)] extended the annihilation and coalescence model to compositionally-graded and multilayered structures by including the misfit dislocation-threading dislocation interactions. However, an impo

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Marshall, A. F., D. B. Aubertine, W. D. Nix, and P. C. McIntyre. "Misfit dislocation dissociation and Lomer formation in low mismatch SiGe/Si heterostructures." Journal of Materials Research 20, no. 2 (2005): 447–55. http://dx.doi.org/10.1557/jmr.2005.0065.

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Using transmission electron microscopy we observe the dissociation of 60° misfit dislocations at the interface of SiGe/Si multilayers, extending into the substrate for distances of 5.0–7.5 nm. Analysis using elasticity theory shows that this dissociationis the equilibrium configuration for individual 60° misfit dislocations, as it is for 60° mixed dislocations in bulk Si, and that the compressively strained multilayer film serves mainly to position the partial dislocations and stacking fault with respect to the free surface. We observe both undissociated 60° and Lomer edge dislocations after a

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Bertoni, Mariana I., Clémence Colin, and Tonio Buonassisi. "Dislocation Engineering in Multicrystalline Silicon." Solid State Phenomena 156-158 (October 2009): 11–18. http://dx.doi.org/10.4028/www.scientific.net/ssp.156-158.11.

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Dislocations are known to be among the most deleterious performance-limiting defects in multicrystalline silicon (mc-Si) based solar cells. In this work, we propose a method to remove dislocations based on a high temperature treatment. Dislocation density reductions of >95% are achieved in commercial ribbon silicon with a double-sided silicon nitride coating via high temperature annealing under ambient conditions. The dislocation density reduction follows temperature-dependent and time-dependent models developed by Kuhlmann et al. for the annealing of dislocations in face-centered cubic met

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Kivambe, Maulid, Gaute Stokkan, Torunn Ervik, Sergio Castellanos, Jasmin Hofstetter, and Tonio Buonassisi. "The Impact of Dislocation Structure on Impurity Decoration of Dislocation Clusters in Multicrystalline Silicon." Solid State Phenomena 205-206 (October 2013): 71–76. http://dx.doi.org/10.4028/www.scientific.net/ssp.205-206.71.

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Light microscopy, electron backscatter diffraction and transmission electron microscopy is employed to investigate dislocation structure and impurity precipitation in commonly occurring dislocation clusters as observed on defect-etched directionally solidified multicrystalline silicon wafers. The investigation shows that poligonised structures consist of parallel mostly similar, straight, well-ordered dislocations, with minimal contact-interaction and no evidence of precipitate decoration. On the other hand, disordered structures consist of various dislocation types, with interactions being co

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Starenchenko, Vladimir, Dmitrii Cherepanov, Raisa Kurinnaya, Marina Zgolich, and Olga Selivanikova. "The Influence of Dislocation Junctions on Accumulation of Dislocations in Strained FCC – Single Crystals." Advanced Materials Research 1013 (October 2014): 272–79. http://dx.doi.org/10.4028/www.scientific.net/amr.1013.272.

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Dislocation junctions, formed as a result of dislocation reactions, affect the plastic strain process, at least, for two reasons. First of all, junctions serve as barriers to shear-forming dislocations and restrict their path, therefore, the size of the shear zone. Sizes of the shear zone are determined by the density of reacting dislocations in non-coplanar slip systems, forming long enough barriers in the form of dislocation junctions. Secondly, non-breaking dislocation junctions are accumulated inside the shear zone, which leads to an increase in the intensity of the dislocation density acc

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Luo, Shichao, and Yinan Cui. "Elastodynamics Field of Non-Uniformly Moving Dislocation: From 3D to 2D." Crystals 12, no. 3 (2022): 363. http://dx.doi.org/10.3390/cryst12030363.

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Molecular dynamics (MD) and experiments indicate that the high-speed dislocations dominate the plasticity properties of crystal materials under high strain rate. New physical features arise accompanied with the increase in dislocation speed, such as the “Lorentz contraction” effect of moving screw dislocation, anomalous nucleation, and annihilation in dislocation interaction. The static description of the dislocation is no longer applicable. The elastodynamics fields of non-uniformly moving dislocation are significantly temporal and spatially coupled. The corresponding mathematical formulas of

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liu, F. X., A. C. F. Cocks, and E. Tarleton. "Dislocation dynamics modelling of the creep behaviour of particle-strengthened materials." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 477, no. 2250 (2021): 20210083. http://dx.doi.org/10.1098/rspa.2021.0083.

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Plastic deformation in crystalline materials occurs through dislocation slip and strengthening is achieved with obstacles that hinder the motion of dislocations. At relatively low temperatures, dislocations bypass the particles by Orowan looping, particle shearing, cross-slip or a combination of these mechanisms. At elevated temperatures, atomic diffusivity becomes appreciable, so that dislocations can bypass the particles by climb processes. Climb plays a crucial role in the long-term durability or creep resistance of many structural materials, particularly under extreme conditions of load, t

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Li, Guangyuan, Fazhan Wang, Zhanwen Chen, et al. "Interaction mechanism of dislocations with Bi/hBN nanoparticles in free‐cutting steels: Molecular dynamics simulations." Physica Scripta, January 2, 2025. https://doi.org/10.1088/1402-4896/ada4f6.

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Abstract To further understand the mechanical properties of free-cutting steels, we employed molecular dynamics (MD) simulations to investigate the interaction mechanisms between dislocation slip along close-packed planes and nano-inclusion particles (Bi/h-BN) within single-crystal iron (Fe). By colliding dislocations at varying slip velocities with nanometerscale particles of different sizes and compositions, we concluded that particle diameter plays a decisive role not only in determining the dislocation cutting mode but also in influencing the dislocation’s shear stress response. These indi

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