Results 261 to 270 of about 88,198 (304)
Some of the next articles are maybe not open access.
Misfit dislocations in heteroepitaxial systems with low dislocation density
Proceedings, annual meeting, Electron Microscopy Society of America, 1978The growth of heteroepitaxial layers causes stress across the interface which in a certain range of layer thickness may he relaxed by the formation of misfit dislocations at the interface. Systematic investigations of such misfit structures by transmission electron microscopy (TEM) have previously heen conducted only on systems with a relatively large ...
W. Hagen, H. Strunk
openaire +1 more source
A model for the mobile dislocation density
Scripta Metallurgica, 1973Abstract In this paper the variation of mobile dislocation density during plastic deformation is considered by treating a dislocation model of the statistical distribution of internal stresses. The model is based on the idea that for a given applied stress, only certain dislocations in regions with low internal back stresses are free to move and ...
R Gasca-Neri, W.D Nix
openaire +1 more source
Dislocation Density Determinations in Composites
JOM, 1986This paper analyzes measurements of the strain amplitude dependence of internal friction for several metal matrix composites (1100 Al, 2124 Al, and 6061 Al reinforced with SiC) to determine the concentration of dislocations that were mobile during low strain (
J. T. Hartman +3 more
openaire +1 more source
The density of dislocations in compressed copper
Acta Metallurgica, 1957Abstract The changes in stored energy, macroscopic density and electrical resistivity associated with the annealing of deformed copper have been measured. Three independent estimates of the density of dislocations in the deformed material are obtained by combining these results with the best available theoretical values for the energy, density and ...
L.M Glarebrough +2 more
openaire +1 more source
A consideration of mobile dislocation density
Scripta Metallurgica, 1978From 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
Dislocation density evaluation using dislocation kinetics model
Journal of Crystal Growth, 2007Abstract A dislocation kinetics model called the Haasen–Alexander–Sumino (HAS) model is applicable to the quantitative estimation of dislocation density in semiconducting single crystals. In this model, creep strain rate is related with the dislocation density as well as stress components, together with a time-evolution equation of the dislocation ...
openaire +1 more source
ON THE DETERMINATION OF DISLOCATION DENSITIES
1969Abstract : 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
Dissociation of an Edge Dislocation in Sodium Chloride with High Density of Dislocation
Journal of the Physical Society of Japan, 1979The core structure of an a /2[110](1\bar10) edge dislocation in sodium chrolide crystal was studied by computer simulation under a cyclic boundary condition. It is found that each dislocation is dissociated into two partials with Burgers vectors a /2[100] and a /2[010], forming a crack on the expanded side of the dislocation and that the average ...
Toru Matsuo, Hideji Suzuki
openaire +1 more source
Anomalous dislocation densities in potassium
Journal of Physics F: Metal Physics, 1982It has recently been proposed that some anomalies in the electrical transport properties of potassium below 4K can be explained in terms of an additional, indirect scattering from dislocations. However, it is shown here that the dislocation densities which have been assumed are several orders of magnitude larger than direct evidence suggests is ...
openaire +1 more source
On the mobile dislocation density in creep
Czechoslovak Journal of Physics, 1988A theory of mobile dislocation density in creep has been suggested which takes into account the mobilization of dislocations with the assistance of thermal activation. The values of mobile dislocation density as determined by means of the theory from the creep and structure data (for Al-Mg alloys) are in good correspondence with results of direct ...
openaire +1 more source