TEM Observations Of Dislocations In Plastically Deformed Diamond

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bright-field TEM image of a typical Si nanoparticle. The spherical shape is evident, and the selected-area diffraction pattern of this particle is in agreement with the [112] zone (a) (b) (c) Figure 1: Nanosphere observations. (a) Bright-field TEM image showing an 80 nm radius Si nanosphere without obvious defects.

X-ray strain analysis at high pressure: Effect of plastic

plasticity plays a role. When the polycrystal is plastically deformed, several important changes occur. First, the x-ray diffraction is only sampling a portion of the total strain field. It does not reflect the plastic portion. Second, once the plas-tic deformation initiated, plastic properties may dominate the stress strain state.


11. dislocations in plastically deformed gaas:cr. thermal conductivity measurements. j. jouglar, p. l. vuillermoz 797 12. glide of a and /3 dislocations in gaas. g. feuillet, d. cherns 803 13. plasticity of cd0 66hg0 34te tem observations of dislocations. j. f. barbot, g. rivaud, j. c. desoyer 809 14. dangling bonds in a dislocation core in ge

Electrical conduction along dislocations in 2 plastically

the dislocation density estimated by TEM observations. These facts indicate that the spots correspond to the deformation-introduced edge dislocations whose ends should appear on this surface. In the 15% deformed sample, chain-like alignment of the spots along the slip direction are not observed. This is


sectional), transmission electron microscopy (lattice imaging and dark field), and x-ray diffiraction techniques were used to characterize film structure. The as-deposited morphology, which can be described in terms of zone models, was found to influence the iritlai nature of the wear debris and the load-bearing capabilities of the films.

Do plastic zones form at crack tips in silicate glasses?

or Si. By using transmission electron microscopy to exam-ine the indented region, it was possible to show that these impressions were indeed due to plastic deformation [2]. The region surrounding the plastic impression was filled with dislocations, which are typical of crystalline materials that had been deformed plastically.

Vacancy clusters, dislocations and brown colouration in diamond

all plastically deformed diamonds are brown), and since plastic deformation results in dislocations and there are high numbers of these in brown diamond, the question arises, in the light of lack of impurities, whether the colour is due to electronic states at dislocations. Electronic states in the diamond band gap at dislocation

Partial Dislocation Source in InSb: A New Mechanism

3. Transmission Electron Microscopy Observations Fig. 1, obtained with the 022 reflection in the primary glide plane ( 11 1), evidences dis-locations regularly distributed on both sides of a band elongated in the [011] direction. Due to their curved shape, dislocations seem to be emitted from this band. After emis-

Chapter 3 Nanoindentation-induced Mechanical Responses T

between the sample and the tip is performed to study the evolution of the deformed region during nanoindentation processes. MD simulations indicates that the semiconductors deform plastically at various effects of loads and temperatures and, our results are able to give a good description even for an ultra-small penetration depth (<3nm). The

Plasticity mechanisms in sub-micron Al fiber investigated by

fabrication of one TEM sample results in a set of Al fibers with a similar crystalline orientation and different lengths and sections. The fiber section was measured either post-mortem or in-situ. In the post-mortem method, the fiber was cut by FIB in or near the plastically deformed area and the cross section was directly observed in SEM.

Plastic deformation of quartz at room temperature

(a) A TEM image of the deformed and surround- ing intact areas. The four white lines are fractures, which were induced during sample preparation for TEM observation after the indentation test. The square deformed area can be clearly distinguished in this image. There are no visible dislocations in the deformed and the surrounding intact areas.


GBs. The SrTiO3 single crystals were indented with the sharp diamond tip and successfully observed the dislocation dynamics. In the case of the GBs, the interaction between the introduced lattice dislocations and the GBs were directly observed. The dislocation-GB interaction and its dependence on the GB characters will be discussed in detail.

The Annealing Behavior of the Subsurface Zone Induced by

finally wear. Thus, the studies of dislocations and generally defects in the SZ are necessary for better understanding of wear [6]. The motion of dislocations which occurs during plastic deformation is the origin of other point defects, such as interstitial atoms, vacancies, their clusters or jogs on their lines [7].

Pressure-enforced plasticity in MAX phases: from single grain

may interact with basal dislocations impeding their movement through tree forest inter-actions. Additionally, a recent TEM analysis of plastically deformed Ti 2AlN polycrystal-line sample has revealed that basal dislocations strongly interact within the grains and react to form complex networks [20].

Twinning in copper deformed at high strain rates

The experimental observations made regarding the presence of twins in deformed copper can be roughly divided into two classifications regarding their origin depending on whether the samples were viewed using a SEM or TEM apparatus. 3.1 Samples viewed using SEM Images obtained of the sample grain structures with the SEM are shown in figures 3

References - Universiteit Utrecht

149 References t Hart, J. (1978). The structural morphology of olivine-type minerals. A qualitative and quantitative approach and a comparison of theoretical morphologies with habits of

Healing and LCF - Final

deformed by a spherical indenter using a recently developed freestanding membrane test. Freestanding membranes of gold were centrally deflected using a spherical indenter attached to a MEMS load cell. Fabrication of the films for these experiments yielded films 100 nm thick and 500 µm in diameter. We observed that the plastically deformed thin

Undissociated screw dislocation in Si: Glide or shuffle set?

as dislocations move through, in contrast to breaking three bonds across the glide-set planes, until transmission electron microscopy TEM Perdew-Wang generalized gradient approximationrevealed that specimen deformed at high-T contains plenty of dissociated partial dislocations,5,6 which can only exist on the glide-set plane.7 Density functional

Deformation behaviors of InP pillars under uniaxial compression

transmission electron microscopy (TEM) to delineate the activities of the extended defects associated with the compression-induced deformation.3 9 Very recently, in-situ micro-compression test on Al micro-pillars has been con-ducted directly inside a high-resolution electron micro-scope.10 This enables the in-situ observations of the structural


dislocations until recently were thought to be the only agents of plastic deformation. In the core of any dislocation there must exist a severe disarrangement of the tetrahedral coordination typical for the diamond structure. But dissociating the two sets of dislocations into Shockley partials border-

Dislocation processes during the deformation of MoSi single

plastically be deformed down to room temperature. The {011) 100], {010) 100] and {110) 111 slip sys-tems exhibit a flow stress anomaly with a flow stress peak at about 850°C for the first two systems and at 1100°C for the latter one [3]. Between about 700 and 1000°C, the {110) 111 system has by far the lowest critical flow

Watching the Growth of Bulk Grains During Recrystallization

When a material is deformed plastically, ex-cess line defects (dislocations) and some ex-cess point defects are introduced into the material. The density of these excess defects can be reduced by means of annealing. Basic processes that take place during annealing are recovery, recrystallization, and grain growth.

Dislocation dipole annihilation in diamond and silicon

in plastically deformed semiconductors. the experimental results of plastic deformation tests and TEM observations associated to dipoles contains perfect dislocations (diamond) or

Impact Response and Microstructural Evolution of Biomedical

Microstructural observations reveal that the strengthening effect evident in the deformed alloy is a result primarily of dislocations and the formation of a phase. The dislocation density increases with increasing strain rate but decreases with increasing temperature. Additionally, the square

Precipitate stability and recrystallisation in the weld

precipitates. Microstructures in the weld nugget were characterised by Transmission Electron Microscopy (TEM) and Three-dimensional Atom Probe (3D-AP). A special emphasis was given on the precipitate evolution, the redistribution of alloying elements, the recrystallisation mechanisms, and the relationships between hardness and

Title Cu/Si interface fracture due to fatigue of copper film

a diamond tip [19-21] installed in a TEM for in-situ observations. In this study, the purposes of the TEM observations are to identify the location of the interfaces, to elucidate fracture features, and to accurately measure the specimen deformation. Metallographic observations through the specimen are out of the scope of the present experiment.

Local current conduction due to edge dislocations in deformed

cation density estimated by TEM observations. We found no apparent correspondence between the current images and the AFM topographic images simultaneously taken, Fig. 2. A TEM bright-field image of a deformed sample. indicating that the conductive spots do not originate in the surface roughness. From these facts, we can conclude

Research Article Experimental Study on Formation

dislocations in alloys decompose partial dislocations more easily. A piece of stacking fault can be extended between two partial dislocations, which takes the shape of fringe contrast under the electron microscope. e attached partial dislocation and stacking fault at both ends are collectively described as extended dislocation.

GHIRUPHGDW57 - iopscience.iop.org

May 20, 2019 The TEM observations show common features in the two deformation substructures which are characteristic of high stress low temperature deformation. The deformation microstructures are built with dislocations with a/2 110 Burgers vector in (111) planes which are undissociated. Such dislocations are mainly aligned along the screw orientation

Journal of the Less-Common Metals, I64 & 165 (1990) 223-230

Journal of the Less-Common Metals, I64 & 165 (1990) 223-230 223 DISLOCATIONS IN YBa2Cu307 6 CERAMICS PLASTICALLY DEFORMED AT ROOM TEMPERATURE


Plastically deformed Elasticoliy distorted i u u i region Shock Front FIGURE 6. Stress due to dislocations on a point at shock front. (a) Dislocation Density The specific volume can be expressed as a function of pressure, P, through one of the equations obtained directly from the Rankine-Hugoniot equations and the equation of state [7].

Deformed Microstructure and Hardness of Hadfield High

deformed and additional forty grains of the non-deformed Hadfield steel were respectively examined. Multiple meas-urements demonstrated that the deviation of the hardness values measured in the same grain of the non-deformed steel is negligibly small (Fig. 2(c)); however, large deviations were observed in most of the deformed grains (Fig. 2(d

Extended Defects in Germanium - ReadingSample

Springer Series in Materials Science 118 Extended Defects in Germanium Fundamental and Technological Aspects Bearbeitet von Cor Claeys, Eddy Simoen 1. Auflage 2009. Buch. xx, 300


y-iron particles were deformed in tension along the [100] direction to induce y + a martensitic transformation. The particle size was observed as a function of time by utilizing transmiSSion electron microscopy. -As a supplement to the TEM studies, a superconducting susceptometer (SQUID) was used to measure the magnetization of the

First stages of plasticity in nano- and micro-objects

dislocations from bulk sources, such as Franck Read sources, and their subsequent glide; no size effect is expected to occur then. However, in nanostructures, because of the small dimensions and the low initial density of dislocations, such mechanisms are inhibited.