Hall-Petch strengthening in ultrafine-grained Zn with stabilized boundaries

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F24%3A43930793" target="_blank" >RIV/60461373:22310/24:43930793 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/24:00602361

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2238785424026607?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2238785424026607?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jmrt.2024.11.132" target="_blank" >10.1016/j.jmrt.2024.11.132</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Hall-Petch strengthening in ultrafine-grained Zn with stabilized boundaries

Popis výsledku v původním jazyce

A relationship between the tensile yield stress and grain size i.e., Hall-Petch (H-P) law, for an ultrafine-grained (UFG) Zn was experimentally evaluated for the first time. In reality, it is problematic to assess this prediction using experimental results due to the low recrystallization temperature of a pure Zn. In order to do so, three Zn bulk materials with the intercept grain size (d(l)) ranging from 0.6 to 1.1 mu m, stabilized with a small portion of nanoscale ZnO dispersoids positioned at high angle grain boundaries (HAGB), were fabricated from fine pure Zn powders. The material with the finest grain size of 0.6 mu m, ever reported for unalloyed Zn, also exhibited the highest ultimate tensile and 0.2% strain offset yield strengths (YS0.2), ever reported for unalloyed Zn. The strengths were accompanied by a reasonably high ductility. Deformation in the presented materials was attributed to the grain boundary sliding (GBS) mechanism. The experimental data were compared with a theoretical model of the deformation behavior of UFG metals based on GBS through dislocation glide. We confirmed, that the linear H-P relation YS0.2 = 40.8 + 104.8 d(l)(-0.5) remained in force in the range of d(l) = similar to 400-0.6 mu m. A grain refinement softening in UFG region predicted by the theoretical model and other experimental works was avoided. This was attributed to the presence and an effective stabilizing effect of the nano-metric ZnO at HAGB, which impeded GBS. The practical implications of the presented concept of Zn-based bioresorbable material are discussed from the point of view of potential applications in implantology.

Název v anglickém jazyce

Hall-Petch strengthening in ultrafine-grained Zn with stabilized boundaries

Popis výsledku anglicky

A relationship between the tensile yield stress and grain size i.e., Hall-Petch (H-P) law, for an ultrafine-grained (UFG) Zn was experimentally evaluated for the first time. In reality, it is problematic to assess this prediction using experimental results due to the low recrystallization temperature of a pure Zn. In order to do so, three Zn bulk materials with the intercept grain size (d(l)) ranging from 0.6 to 1.1 mu m, stabilized with a small portion of nanoscale ZnO dispersoids positioned at high angle grain boundaries (HAGB), were fabricated from fine pure Zn powders. The material with the finest grain size of 0.6 mu m, ever reported for unalloyed Zn, also exhibited the highest ultimate tensile and 0.2% strain offset yield strengths (YS0.2), ever reported for unalloyed Zn. The strengths were accompanied by a reasonably high ductility. Deformation in the presented materials was attributed to the grain boundary sliding (GBS) mechanism. The experimental data were compared with a theoretical model of the deformation behavior of UFG metals based on GBS through dislocation glide. We confirmed, that the linear H-P relation YS0.2 = 40.8 + 104.8 d(l)(-0.5) remained in force in the range of d(l) = similar to 400-0.6 mu m. A grain refinement softening in UFG region predicted by the theoretical model and other experimental works was avoided. This was attributed to the presence and an effective stabilizing effect of the nano-metric ZnO at HAGB, which impeded GBS. The practical implications of the presented concept of Zn-based bioresorbable material are discussed from the point of view of potential applications in implantology.

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

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

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Journal of Materials Research and Technology-JMR&amp;T

ISSN

2238-7854

e-ISSN

2214-0697

Svazek periodika

33

Číslo periodika v rámci svazku

November

Stát vydavatele periodika

ZA - Jihoafrická republika

Počet stran výsledku

11

Strana od-do

7458-7468

Kód UT WoS článku

001360920000001

EID výsledku v databázi Scopus

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