Atomic insights into interface-mediated plasticity and engineering principles for heterogeneous serrated interfaces

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27640%2F23%3A10253194" target="_blank" >RIV/61989100:27640/23:10253194 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989100:27740/23:10253194

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0749641922002753" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0749641922002753</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijplas.2022.103498" target="_blank" >10.1016/j.ijplas.2022.103498</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Atomic insights into interface-mediated plasticity and engineering principles for heterogeneous serrated interfaces

Popis výsledku v původním jazyce

Metallic nanolayered composites typically experience substantially enhanced resistance to irre-versible deformation as the portion of interfaces increases. Three-dimensional (3D) serrated in-terfaces possess considerably higher resistance to interface-facilitated plasticity than two-dimensional (2D) planar interfaces; however, the atomistic mechanisms underlying this phe-nomenon are little explored, while the engineering principles of tailoring atomic serrations are nearly unknown. In this study, two known representative serrated interfaces, i.e., Cu{991}// {112}Nb and Cu{112}//{112}Nb interfaces, are analyzed using atomic-scale simulations and interfacial dislocation theory and comprehensively compared with their planar counterparts. The Cu{991}//{112}Nb and Cu{112}//{112}Nb serrated interfaces exhibit the novel interface-facilitated deformation behaviors of deformation twinning and near-interface dislocation nucle-ation, respectively. The stress inhomogeneity arising from the geometrical mismatch between Cu and Nb serrations contributes to deformation twinning rather than dislocation nucleation, while the improved symmetry of highly distorted atomic hexagons on the extended Cu{111}//{110}Nb facets dominates the near-interface dislocation nucleation. Both deformation twinning and dislocation nucleation are closely related to the geometry and characteristics of atomic serrations at the interfaces, which differ from those observed in planar interfaces. Further systematic in-vestigations of fourteen serrated interfaces derived from Cu{991}//{112}Nb and Cu{112}// {112}Nb suggest that the screened facet planes, free volume, and Poisson&apos;s ratio mismatch may be used as critical descriptors to tailor the mechanical properties and responses, which presents a convenient solution for interface engineering. These findings provide not only novel atomistic mechanisms that explain the localized interface-facilitated plasticity, but also general principles for engineering atomically serrated interfaces.

Název v anglickém jazyce

Atomic insights into interface-mediated plasticity and engineering principles for heterogeneous serrated interfaces

Popis výsledku anglicky

Metallic nanolayered composites typically experience substantially enhanced resistance to irre-versible deformation as the portion of interfaces increases. Three-dimensional (3D) serrated in-terfaces possess considerably higher resistance to interface-facilitated plasticity than two-dimensional (2D) planar interfaces; however, the atomistic mechanisms underlying this phe-nomenon are little explored, while the engineering principles of tailoring atomic serrations are nearly unknown. In this study, two known representative serrated interfaces, i.e., Cu{991}// {112}Nb and Cu{112}//{112}Nb interfaces, are analyzed using atomic-scale simulations and interfacial dislocation theory and comprehensively compared with their planar counterparts. The Cu{991}//{112}Nb and Cu{112}//{112}Nb serrated interfaces exhibit the novel interface-facilitated deformation behaviors of deformation twinning and near-interface dislocation nucle-ation, respectively. The stress inhomogeneity arising from the geometrical mismatch between Cu and Nb serrations contributes to deformation twinning rather than dislocation nucleation, while the improved symmetry of highly distorted atomic hexagons on the extended Cu{111}//{110}Nb facets dominates the near-interface dislocation nucleation. Both deformation twinning and dislocation nucleation are closely related to the geometry and characteristics of atomic serrations at the interfaces, which differ from those observed in planar interfaces. Further systematic in-vestigations of fourteen serrated interfaces derived from Cu{991}//{112}Nb and Cu{112}// {112}Nb suggest that the screened facet planes, free volume, and Poisson&apos;s ratio mismatch may be used as critical descriptors to tailor the mechanical properties and responses, which presents a convenient solution for interface engineering. These findings provide not only novel atomistic mechanisms that explain the localized interface-facilitated plasticity, but also general principles for engineering atomically serrated interfaces.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

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

Návaznosti

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

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

International Journal of Plasticity

ISSN

0749-6419

e-ISSN

1879-2154

Svazek periodika

160

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

16

Strana od-do

—

Kód UT WoS článku

000924585100001

EID výsledku v databázi Scopus

2-s2.0-85144379186