Results 241 to 250 of about 191,305 (291)

Limit of Dislocation Density and Dislocation Strengthening in Iron

Materials Science Forum, 2006
The limit of dislocation density was investigated by means of mechanical milling (MM) treatment of an iron powder. Mechanical milling enabled an ultimate severe deformation of iron powder particles and dislocation density in the MM iron powder showed the clear saturation at around the value of 1016m-2.
Koichi Nakashima, M. Suzuki, Y. Futamura, Toshihiro Tsuchiyama, Setsuo Takaki   +4 more
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Misfit dislocations in heteroepitaxial systems with low dislocation density

Proceedings, annual meeting, Electron Microscopy Society of America, 1978
The 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
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Dislocation density evaluation using dislocation kinetics model

Journal of Crystal Growth, 2007
Abstract 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 ...
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Density-wave theory of dislocations in crystals

Physical Review B, 1988
The density-wave theory of Ramakrishnan and Yussouff is extended to provide a scheme for describing dislocations and other topological defects in crystals. Quantitative calculations are presented for the order-parameter profiles, the atomic configuration, and the free energy of a screw dislocation with Burgers vector b=(a/2, a/2, a/2) in a bcc solid ...
Lakshmi, Raj M, Murthy, Krishna HR, Ramakrishnan, TV   +2 more
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Dislocation-density function dynamics – An all-dislocation, full-dynamics approach for modeling intensive dislocation structures

Journal of the Mechanics and Physics of Solids, 2016
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
LEUNG, HS, Ngan, AHW
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Dislocation-density kinematics: a simple evolution equation for dislocation density involving movement and tilting of dislocations

MRS Communications, 2017
In this paper, a simple evolution equation for dislocation densities moving on a slip plane is proven. This equation gives the time evolution of dislocation density at a general field point on the slip plane, due to the approach of new dislocations and tilting of dislocations already at the field point.
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Comment on “Dislocations Jam at Any Density”

Physical Review Letters, 2012
A Comment on the Letter by G. Tsekenis, N. Goldenfeld, and K. A. Dahmen, Phys. Rev. Lett. 106, 105501 (2011). The authors of the Letter offer a Reply.
I, Groma, G, Györgyi, P D, Ispánovity
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Punched-Out Dislocation Rosettes in Low-Dislocation-Density Copper

Journal of Applied Physics, 1972
Copper single crystals of extremely low dislocation density have been obtained through a thermal cyclic annealing. Ball indentation in the dislocation-free area of (111) surface produced large dislocation rosettes, each arm extending in the 〈110〉 cystallographic orientations consisted of a row of prismatic dislocation half-loops.
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Dislocation density in Ni3(Al,Hf)

Intermetallics, 2000
Abstract The temperature dependence of dislocation density and its relationship with the anomalous growth of the flow stress are presented. A pronounced density increase of about one order of magnitude in a temperature range below the peak of anomalous flow stress growth has been clearly established experimentally.
T. Kruml, V. Paidar, J.L. Martin
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Anomalous dislocation densities in potassium

Journal of Physics F: Metal Physics, 1982
It 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 ...
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