Journal ArticleDOI
The Orowan mechanism in anisotropic crystals
R.O. Scattergood,David Bacon +1 more
Reads0
Chats0
TLDR
The static equilibrium configurations of a dislocation bypassing a periodic row of impenetrable circular obstacles were obtained for various crystals by means of a self-stress method wherein the elastic anisotropy of the crystal and the dislocation self-interaction could be taken into account.Abstract:
The static equilibrium configurations of a dislocation bypassing a periodic row of impenetrable circular obstacles were obtained for various crystals by means of a self-stress method wherein the elastic anisotropy of the crystal and the dislocation self-interaction could be taken into account. A correlation was developed from the results which related the Orowan stress values to the obstacle size and spacing. This correlation demands two parameters to account for the anisotropy, and these appear as a suitably defined anisotropic shear modulus and Poisson's ratio. The self-interactions are taken into account by a single logarithmic parameter which is the harmonic mean of the obstacle size and spacing, and is independent of anisotropy. The shapes of the bowing dislocation loops are strongly influenced by the anisotropy and interactions. The combined effects on shape can bo simply described in the line-tension framework, using the de Wit—Koehler solutions. In particular, the swept areas and overall ...read more
Citations
More filters
Journal ArticleDOI
On the additivity of precipitation and solid solution hardening in under-and over-aged single crystals of (CuAu)-Co
TL;DR: In this article, the superposition of precipitation ( τ p ) and solid solution ( τ s ) hardening has been experimentally investigated for the system copper-gold-cobalt.
Journal ArticleDOI
Multiscale dislocation dynamics plasticity
TL;DR: In this article, a discrete Dislocation Dynamics (DD) model for crystalline materials coupled with finite elements (FE) analysis developed recently by Zbib and co-workers is reviewed.
Journal ArticleDOI
Threshold Stress for High-Temperature Creep in Particle Strengthened Al-1.5 vol%Be Alloys
Journal ArticleDOI
On the additivity of solid solution and dispersion strengthening
TL;DR: In this paper, the superposition of solid solution and dispersion strengthening has been experimentally investigated for a copper-rich copper-gold solid solution dispersion strengthened by incoherent SiO2-particles.
Journal ArticleDOI
Dislocation pinning by substitutional impurities in an atomic-scale model for Al(Mg) solid solutions
Sylvain Patinet,Laurent Proville +1 more
TL;DR: In this paper, the static depinning threshold of dislocations in Al(Mg) solid solutions is investigated for different types of obstacles, i.e., single solute atoms situated at different positions, and solute dimers with different bond directions.
References
More filters
Book
Theory of Dislocations
John Price Hirth,Jens Lothe +1 more
TL;DR: Dislocations in Isotropic Continua: Effects of Crystal Structure on Dislocations and Dislocation-Point-Defect Interactions at Finite temperatures.
Journal ArticleDOI
The effect of dislocation self-interaction on the Orowan stress
TL;DR: In this article, the effect of dislocation self-interaction on the Orowan stress was determined for collinear, impenetrable circular obstacles, and an appropriate integro-differential equation governing static equilibrium was solved by an algorithm based on curvature adjustments.
Journal ArticleDOI
The self-stress of dislocations and the shape of extended nodes
TL;DR: In this article, a definition of the self-stress of a dislocation is proposed which is closely related to the more usual notion of a line tension, enabling a numerical calculation to be made of the shape of extended nodes in dislocation networks, and such a calculation leads to revised values of stacking-fault energies of alloys.
Journal ArticleDOI
Interaction of Dislocations with an Applied Stress in Anisotropic Crystals
G. deWit,J. S. Koehler +1 more
TL;DR: In this article, the equilibrium shape of a dislocation segment between two pinning points in the same glide plane is calculated using an energy per unit length, which is a function only of the angle between the Burgers vector and the tangent to the dislocation.