Improving method for deterministic treatment of double cross-slip in FCC metals under low homologous temperatures

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F21%3A00353748" target="_blank" >RIV/68407700:21110/21:00353748 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/21:00353748

Výsledek na webu

<a href="https://doi.org/10.1016/j.commatsci.2020.110251" target="_blank" >https://doi.org/10.1016/j.commatsci.2020.110251</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.commatsci.2020.110251" target="_blank" >10.1016/j.commatsci.2020.110251</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Improving method for deterministic treatment of double cross-slip in FCC metals under low homologous temperatures

Popis výsledku v původním jazyce

Despite its importance in crystal plasticity, cross-slip has not yet been completely understood. The widely accepted approach understands cross-slip as a thermally-activated stochastic process, especially at higher homologous temperatures. An alternative approach is based on an experimentally supported observation that, especially at lower homologous temperatures, cross-slip becomes a deterministic stress-driven process governed by the line tension, by the applied stress, and by the short-range interactions among dislocations. The current challenge remains in understanding how the tip of the screw dislocation segment of changes the primary slip plane for the secondary slip plane. We suggest an explanation of this problem available by the mathematical theory of moving parametrized curves. For the dynamical change between the primary plane and the cross-slip plane, two methods are introduced and compared. They are referred to as the tilting projection method (denoted as TPM) and the vertical projection method (denoted as VPM). Main difference between them is how they regularize the motion of the dislocation across the edge between the primary and the cross-slip plane. After the motion strategy is set, this article explains that dislocation motion laws can be treated numerically by means of the flowing finite-volume method, including the redistribution of the discretization points ensuring a long-term stability of the algorithm. Particular computational results of cross-slip obtained by both approaches are mutually compared and evaluated. For the considered material setup of the FCC copper and nickel crystals, good agreement has been observed.

Název v anglickém jazyce

Improving method for deterministic treatment of double cross-slip in FCC metals under low homologous temperatures

Popis výsledku anglicky

Despite its importance in crystal plasticity, cross-slip has not yet been completely understood. The widely accepted approach understands cross-slip as a thermally-activated stochastic process, especially at higher homologous temperatures. An alternative approach is based on an experimentally supported observation that, especially at lower homologous temperatures, cross-slip becomes a deterministic stress-driven process governed by the line tension, by the applied stress, and by the short-range interactions among dislocations. The current challenge remains in understanding how the tip of the screw dislocation segment of changes the primary slip plane for the secondary slip plane. We suggest an explanation of this problem available by the mathematical theory of moving parametrized curves. For the dynamical change between the primary plane and the cross-slip plane, two methods are introduced and compared. They are referred to as the tilting projection method (denoted as TPM) and the vertical projection method (denoted as VPM). Main difference between them is how they regularize the motion of the dislocation across the edge between the primary and the cross-slip plane. After the motion strategy is set, this article explains that dislocation motion laws can be treated numerically by means of the flowing finite-volume method, including the redistribution of the discretization points ensuring a long-term stability of the algorithm. Particular computational results of cross-slip obtained by both approaches are mutually compared and evaluated. For the considered material setup of the FCC copper and nickel crystals, good agreement has been observed.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/EF16_019%2F0000778" target="_blank" >EF16_019/0000778: Centrum pokročilých aplikovaných přírodních věd</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Computational Materials Science

ISSN

0927-0256

e-ISSN

1879-0801

Svazek periodika

189

Číslo periodika v rámci svazku

March

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

—

Kód UT WoS článku

000618927800005

EID výsledku v databázi Scopus

2-s2.0-85099003526