Crowdion interstitial
WebJun 30, 2004 · Results are compared as a function of the distance of the interstitial He atoms from the center of the dislocation and the amount of excess volume around the dislocation. Interstitial He atoms have negative binding energy on the compression side of the dislocation and strong positive binding energy on the tension side. WebFeb 22, 2024 · An interstitial atom is a kind of point defect that refers to the superfluous atoms in some gaps of the crystal lattice. When an interstitial atom is squeezed into a very small lattice gap, lattice distortion will occur because the …
Crowdion interstitial
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WebMay 28, 2014 · There is a special configuration called crowdion originally proposed by Paneth which describes a linear compression region induced by a SIA7. Crowdion has some peculiar characteristics, for example, crowdion can move rapidly along the closed packed direction 〈111〉 with very low activation energy7,8. WebNov 29, 2013 · Large-scale computer calculations have been important in exploring both the process of displacement generation and the subsequent history of the interstitialcy as it moves in diffusion. In the guise of a crowdion the interstitial can be expected to have a long free path, but it is more stable in the dumbbell mode.
WebMay 28, 2014 · The interaction between crowdions in one SIA cluster can be revealed by the potential energy surface (PES) as a function of d. Generally, the probability density function P ( d) of finding system... WebIn older publications, only eight high-symmetry interstitial positions were commonly considered. Following Ref. 111, the interstitial positions located between two basal planes are referred as octahedral (O), tetrahedral (T) and non-basal crowdion (C).
WebApr 1, 2010 · Interstitial He atoms have negative binding energy on the compression side of the dislocation and strong positive binding energy on the tension side. Even at low temperatures, interstitial He atoms in the vicinity more » of the dislocation easily migrate to the dislocation core, where they form crowdion interstitials oriented along the close ... WebAb initiocalculations based on density functional theory have been performed to determine the properties of self-interstitial atoms (SIAs), vacancies, and single H and He atoms in hcp-Er. ... basal split, and crowdion (C) interstitial configurations are less stable, followed by the split0001dumbbell and tetrahedral configurations. For both H ...
WebMar 1, 2006 · Formation energies, binding energies, and migration energies of interstitial He atoms in and near the core of an a/2<111> screw dislocation in alpha-Fe are …
WebSep 14, 2024 · Crowdion being an interstitial type zero dimensional defect can form different complexes and clusters allowing the realization of effective propagation modes inaccessible for a single defect. For instance, recent studies of m- and n-crowdion configurations allowed one to figure out a set of specific features, including mass … d wilson \u0026 sons wigstonWebOct 1, 2016 · In order to describe the configuration of interstitial, it is necessary to distinguish the crowdion interstitial and dumbbell interstitial. For the crowdion interstitial, it can be … crystal lake rv resort floridaWebNov 8, 2016 · The resultant mechanism is applicable to any body-centered-cubic (BCC) metals whose self-interstitial atoms become a stable crowdion and is expected to provide a general guideline for ... d wilton and son pigeons