Results 251 to 260 of about 191,305 (291)

Volume density of dislocation lock sources

Russian Physics Journal, 1996
In this paper, we estimate the volume density of dislocation sources formed as a result of contact interaction between dislocations slipping in an octahedral plane and Lomer-Cottrell dislocation locks. Assuming that during the deformation each dislocation source forms a slip trace, we estimate the average distance between slip traces.
V. S. Kobytev, M. I. Slobodskoi, T. N. Golosova, L. E. Popov   +3 more
openaire   +1 more source

A consideration of mobile dislocation density

Scripta Metallurgica, 1978
From the assumption that the yield stress consists of two components and that the mobile dislocation density can vary, it was possible to determine the mobile dislocation density as a function of effective stress or temperature. The results indicate that for Fe the internal stress does not decrease simply, instead it first increases and then decreases,
S. Raghuraman, R.J. Arsenault
openaire   +1 more source

Density changes of crystals containing dislocations

Philosophical Magazine, 1958
Zener's theory of the volume expansion of self-strained elastic bodies is applied to screw and edge dislocations in isotropic media.
A. Seeger, P. Haasen
openaire   +1 more source

Dislocation density in highly deformed NaCl single crystals

Physica Status Solidi (a), 1972
The controversy about the relation between the flow stress τ and the screw dislocation density Ns, at large values of Ns in NaCl is clarified. Using both etch pit and electron transmission techniques a relation of the type is confirmed as has also been found for low Ns values. The origin of dislocation dipoles observed in transmission is discussed.
J. Hesse, L. W. Hobbs
openaire   +1 more source

A Geometric Approach to Dislocation Densities in Semiconductors

Modern Physics Letters B, 2014
Dislocation densities threading semiconductor crystals are a problem for device developers. Among the issues presented by the defect density is the appearance of the so-called shallow levels. In this work, we introduce a geometric model to explain the origin of the observed shallow levels.
K. Bakke, F. Moraes
openaire   +1 more source

Dislocation Velocities, Dislocation Densities, and Plastic Flow in Lithium Fluoride Crystals

Journal of Applied Physics, 1959
Velocities of individual dislocations have been measured in LiF, covering a range of twelve orders of magnitude in velocity, from 10−7 cm/sec to 105 cm/sec. The velocity is extremely sensitive to applied stress at low velocities, and for each crystal there exists a minimum stress for dislocation motion, below which dislocations do not move.
W. G. Johnston, J. J. Gilman
openaire   +1 more source

Correlation between Dislocation Length and Density

Journal of Applied Physics, 1962
The relation between the dislocation density ρ in the surface of a crystal and the dislocation length per unit volume Λ is calculated assuming either isotropic distribution in space or isotropic distribution in one or several glide planes. It is found that for practically all purposes the relation Λ=2ρ can be used.
openaire   +1 more source

Dynamics of full dislocation-density functions from coarse-graining discrete dislocation density-vector fields

2016
Keynote ...
Leung, HS, Ngan, AHW
openaire   +1 more source

ON THE DETERMINATION OF DISLOCATION DENSITIES

1969
Abstract : The report gives rigorous derivations of relationships between various geometrical parameters and the 'intersection' and 'line length' dislocation densities. The relationship between the two means of obtaining dislocation density has not been derived previously in the literature.
openaire   +1 more source

Dislocation densities in tungsten

Acta Metallurgica, 1967
Barbara Warlimont-Meier, P. Beaedmore, D. Hull   +2 more
openaire   +1 more source