An innovative concept for interstitial diffusion in stressed crystals

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F18%3A00494538" target="_blank" >RIV/68081723:_____/18:00494538 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.ijsolstr.2017.10.036" target="_blank" >http://dx.doi.org/10.1016/j.ijsolstr.2017.10.036</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijsolstr.2017.10.036" target="_blank" >10.1016/j.ijsolstr.2017.10.036</a>

Jazyk výsledku

angličtina

Název v původním jazyce

An innovative concept for interstitial diffusion in stressed crystals

Popis výsledku v původním jazyce

Existing concepts for diffusion of interstitial atoms in stressed bodies mostly assume that the mechanical driving force stems from the gradient of the hydrostatic stress component. However, both octahedral and tetrahedral interstitial positions in bcc lattice have tetragonal symmetry only. Therefore, deposition of an atom there causes an anisotropic distortion of the lattice. Considering occupation of octahedral positions, three types of them exist differing in misfit eigenstrain tensors and, consequently, in the interaction energies with any stress field. Thus, the state of the system must be described by three independent site fractions (internal variables) corresponding to the three types of octahedral positions. An according new diffusion equation and respective evolution equations for the three site fractions are derived. The concept is demonstrated on a simple example for diffusion of hydrogen in the stress field of a crack in an elastic body loaded by a uniaxial stress. The current new concept is also directly applicable to the occupation of tetrahedral positions. (C) 2017 Elsevier Ltd. All rights reserved.

Název v anglickém jazyce

An innovative concept for interstitial diffusion in stressed crystals

Popis výsledku anglicky

Existing concepts for diffusion of interstitial atoms in stressed bodies mostly assume that the mechanical driving force stems from the gradient of the hydrostatic stress component. However, both octahedral and tetrahedral interstitial positions in bcc lattice have tetragonal symmetry only. Therefore, deposition of an atom there causes an anisotropic distortion of the lattice. Considering occupation of octahedral positions, three types of them exist differing in misfit eigenstrain tensors and, consequently, in the interaction energies with any stress field. Thus, the state of the system must be described by three independent site fractions (internal variables) corresponding to the three types of octahedral positions. An according new diffusion equation and respective evolution equations for the three site fractions are derived. The concept is demonstrated on a simple example for diffusion of hydrogen in the stress field of a crack in an elastic body loaded by a uniaxial stress. The current new concept is also directly applicable to the occupation of tetrahedral positions. (C) 2017 Elsevier Ltd. All rights reserved.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

<a href="/cs/project/GA17-01641S" target="_blank" >GA17-01641S: Zlepšení vlastností a komplexní charakterizace nové generace oxidy precipitačně vytvrzených ocelí na bázi Fe-Al-O</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

International Journal of Solids and Structures

ISSN

0020-7683

e-ISSN

—

Svazek periodika

134

Číslo periodika v rámci svazku

MAR

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

173-180

Kód UT WoS článku

000426028200011

EID výsledku v databázi Scopus

2-s2.0-85034415416