Results 11 to 20 of about 94,816 (318)

Discrete dislocation simulations and size dependent hardening in single slip [PDF]

open access: yes, 1998
Plastic deformation in two-dimensional monophase and composite materials is studied using a discrete dislocation dynamics method. In this method, dislocations are represented by line defects in a linear elastic medium, and their interactions with ...
van der Giessen, E.   +9 more
core   +1 more source

Defect Structure Determination of GaN Films in GaN/AlN/Si Heterostructures by HR-TEM, XRD, and Slow Positrons Experiments

open access: yesNanomaterials, 2020
The present article evaluates, in qualitative and quantitative manners, the characteristics (i.e., thickness of layers, crystal structures, growth orientation, elemental diffusion depths, edge, and screw dislocation densities), within two GaN/AlN/Si ...
Vladimir Lucian Ene   +7 more
doaj   +1 more source

Existence and stability of a screw dislocation under anti-plane deformation [PDF]

open access: yes, 2014
We formulate a variational model for a geometrically necessary screw dislocation in an anti-plane lattice model at zero temperature. Invariance of the energy functional under lattice symmetries renders the problem non-coercive.
Hudson, Thomas, Ortner, Christoph
core   +1 more source

THE POST-SEDIMENTARY CHARACTER OF DEVELOPMENT OF INTRAPLATE DISLOCATIONS AS A REFLECTION OF IMPULSIVENESS OF DEFORMATION PROCESSES

open access: yesГеодинамика и тектонофизика, 2015
The available data on well-studied areas of the Turan platform (as an example) are reviewed and analyzed to reveal the role of con-sedimentation and post-sedimentation tectonic movements in formation of dislocations of the sedimentary cover.
V. I. Popkov
doaj   +1 more source

DISLOCATION AND FRACTURE-DISLOCATION OF THE PELVIS [PDF]

open access: yesThe Journal of Bone and Joint Surgery. British volume, 1948
1. Fifty dislocations and fracture-dislocations of the pelvis have been reviewed. 2. Complications were unusual. Two patients with rupture of the bladder died; two with rupture of the urethra survived. Of eight patients with retroperitoneal haemorrhage four died; the treatment advised is controlled blood transfusion maintaining a blood-pressure of ...
openaire   +2 more sources

The significance of γ-and λ-dislocations in transient states of phyllotaxis: how to get more from less – sometimes!

open access: yesActa Societatis Botanicorum Poloniae, 2016
In some plants, developmental changes of phyllotaxis are so frequent that the whole spectrum of phyllotactic patterns becomes available for investigation and thus many unknown subtleties of phyllotaxis come to light.
Beata Zagórska-Marek, Marcin Szpak
doaj   +1 more source

Residual stress relief mechanisms of 2219 Al–Cu alloy by thermal stress relief method

open access: yesReviews on Advanced Materials Science, 2022
Monolithic thin-wall components of 2219 Al–Cu alloy are widely used in aerospace and military fields, and usually treated with solution and quenching to improve their comprehensive performance. However, a high magnitude residual stress is introduced into
Song Hechuan   +3 more
doaj   +1 more source

Dynamic Shear Deformation in Zinc Crystals [PDF]

open access: yes, 1962
The initial stages of yielding in single crystals of zinc have been investigated at temperatures of -292°F (-180°C), -93°F (-70°C) and +75°F (24°C), by means of rapidly applied constant stress pulses to produce slip along the basal planes of these ...
King, Kenneth Robert
core   +1 more source

Faceting and Twin–Twin Interactions in {1121} and {1122} Twins in Titanium

open access: yesMetals, 2022
Twin–twin interactions are an important component of the microstructural evolution of hexagonal close-packed metals undergoing plasticity. These interactions are prevalent because of the predominance of twinning due to limited easy slip modes.
Christopher Barrett   +2 more
doaj   +1 more source

Unveiling the Mechanisms of High-Temperature 1/2[111] Screw Dislocation Glide in Iron–Carbon Alloys

open access: yesCrystals, 2022
We have developed a self-consistent model for predicting the velocity of 1/2[111] screw dislocation in binary iron–carbon alloys gliding by a high-temperature Peierls mechanism.
Ivaylo Hristov Katzarov   +1 more
doaj   +1 more source

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