Journal ArticleDOI
The Orowan mechanism in anisotropic crystals
R.O. Scattergood,David Bacon +1 more
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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
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Theory-guided Design of High-strength, High-melting point, Ductile, Low-density, Single-phase BCC High Entropy Alloys
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Microstructure and mechanical properties of a Ni-based superalloy after heat treatment in a steady magnetic field
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Modeling the climb-assisted glide of edge dislocations through a random distribution of nanosized vacancy clusters
TL;DR: In this article, a multiscale model is developed to simulate the climb-assisted glide of edge dislocations anchored by a random distribution of nanosized vacancy clusters, which can be used to calibrate the parameters of an elastic line model, which is employed to evaluate the average glide distance of a dislocation with realistic dimensions.
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Dislocation processes in precipitate-free zones in NIMONIC PE16 studied by in situ transmission electron microscopy
TL;DR: In this paper, the authors studied the dislocation processes in NIMONIC PE16, a nickel-based superalloy containing Ni, Fe, Cr, Mo, Al, and Ti.
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Discovery of marageing steels: machine learning vs. physical metallurgical modelling
Chunguang Shen,Chenchong Wang,Pedro E.J. Rivera-Díaz-del-Castillo,Dake Xu,Qian Zhang,Chi Zhang,Wei Xu +6 more
TL;DR: In this article, the authors compared the strength and weaknesses of physical metallurgical (PM) and data-driven approaches to alloy design, and found that PM approaches provide a clearer picture of the overall composition-microstructure-properties relationship but are highly sensitive to the alloy system and hence lack on exploration ability of new domains.
References
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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.