The density and the character of dislocations and the size-distribution of grains or subgrains were determined by a new procedure of X-ray diffraction (XRD) profile analysis in copper specimens deformed by equal channel angular pressing (ECA) or cold rolling. The anisotropic strain broadening of diffraction profiles was accounted for by dislocation contrast factors. The screw or edge character ...

The elastic interactions between dislocations and lattice point defects (PDs) control the rate of PD elimination at dislocations, thereby spatial distribution within microstructure. By relying on Onsager formalism, we introduce a new partition diffusion driving force in strain field. We present DFT-based calculations straight loop-form edge dislocation absorption efficiencies resulting biases v...

Abstract: powerful method for the characterization of microstructures of crystalline materials in terms of crystallite size anddislocation structures. In this paper the effect of the sliding on the microstructure of A356 in the as-cast and heattreated conditions are studied, The X-ray phase analysis shows that with increasing applied load, the dislocationdensity is increased, whereas the crysta...

A multiscale quasicontinuum density functional theory method is used to study the solid solution effect on dislocation nucleation during nanoindentation. Specifically, an Al thin film with Mg impurities is considered. We find that the solid solution effect depends sensitively on the local configuration of the impurities. Although a random distribution of the impurities increases the hardness of...

A pileup of edge dislocations against an arbitrarily inclined flat bimetallic interface is considered. Equilibrium positions of dislocations are determined for a given number of dislocations and specified material properties, assuming that the resolved shear stress along the pileup plane from a remotely applied loading is uniform and equal for all interface inclination angles. Numerical results...

BACKGROUND Apart from the mortality, road traffic injuries are associated with significant morbidities. This study has aimed to examine the pattern of traffic accident-related extremity fractures/dislocations and their related disabilities. METHODS A retrospective hospital-based study was conducted to assess the characteristics of limb fractures/dislocations among road traffic accident victim...

Atomic resolution electron microscopy has been used to obtain images of moving dislocation kinks on partial dislocations at 600 ±C in silicon. Video difference images are used to obtain direct estimates of kink velocity. Observations of kink delay at obstacles, thought to be oxygen atoms at the dislocation core, yield unpinning energies and parameters of the obstacle theory of kink motion. The ...