Production, annihilation and migration of point defects in cyclic straining

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F20%3A00535670" target="_blank" >RIV/68081723:_____/20:00535670 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2589152920303549?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2589152920303549?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mtla.2020.100938" target="_blank" >10.1016/j.mtla.2020.100938</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Production, annihilation and migration of point defects in cyclic straining

Popis výsledku v původním jazyce

Interactions of mobile dislocations in persistent slip bands with ladder-like structure are analyzed and production rates of point defects, preferably vacancies, are derived. Previous resistivity measurements in copper single crystals and polycrystals are used to derive the growth of vacancy concentration during cyclic loading at low temperatures. The parameters of the growth law are derived from the initial growth rate and saturated vacancy concentration. The consequences of vacancy production in localized cyclic straining on the surface relief formation are analyzed. At very low temperature vacancies are produced and annihilated only athermally and vacancy concentration saturates. Localized deformation in persistent slip bands produces high vacancy concentration which outcomes in formation of tiny extrusions. At ambient and slightly elevated temperatures vacancies are steadily produced and migrate from the persistent slip bands to the matrix. This results in formation of persistent slip markings consisting of extrusions and intrusions. The shape of extrusions and intrusions depends on the on the dislocation arrangement in the PSB and in the neighbor matrix and their history during cyclic straining. Fatigue cracks start from sharp-edged intrusions.

Název v anglickém jazyce

Production, annihilation and migration of point defects in cyclic straining

Popis výsledku anglicky

Interactions of mobile dislocations in persistent slip bands with ladder-like structure are analyzed and production rates of point defects, preferably vacancies, are derived. Previous resistivity measurements in copper single crystals and polycrystals are used to derive the growth of vacancy concentration during cyclic loading at low temperatures. The parameters of the growth law are derived from the initial growth rate and saturated vacancy concentration. The consequences of vacancy production in localized cyclic straining on the surface relief formation are analyzed. At very low temperature vacancies are produced and annihilated only athermally and vacancy concentration saturates. Localized deformation in persistent slip bands produces high vacancy concentration which outcomes in formation of tiny extrusions. At ambient and slightly elevated temperatures vacancies are steadily produced and migrate from the persistent slip bands to the matrix. This results in formation of persistent slip markings consisting of extrusions and intrusions. The shape of extrusions and intrusions depends on the on the dislocation arrangement in the PSB and in the neighbor matrix and their history during cyclic straining. Fatigue cracks start from sharp-edged intrusions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Materialia

ISSN

2589-1529

e-ISSN

—

Svazek periodika

14

Číslo periodika v rámci svazku

DEC

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

100938

Kód UT WoS článku

000598847500012

EID výsledku v databázi Scopus

2-s2.0-85094195857