From microscopic to atomistic scale: Temperature effect on yttria distribution in mechanically alloyed FeCrMnNiCo powder particles

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F23%3A00576450" target="_blank" >RIV/68081723:_____/23:00576450 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0925838823031535?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0925838823031535?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jallcom.2023.171850" target="_blank" >10.1016/j.jallcom.2023.171850</a>

Jazyk výsledku

angličtina

Název v původním jazyce

From microscopic to atomistic scale: Temperature effect on yttria distribution in mechanically alloyed FeCrMnNiCo powder particles

Popis výsledku v původním jazyce

Mechanical alloying (MA), the state-of-the-art processing step to produce oxide dispersion strengthened materials, shows a deficiency regarding time and costs hindering a broader applicability. Therefore, in order to investigate the effect of cryogenic MA temperatures and to understand the mechanism behind the refinement and dissolution of yttria, face-centered cubic FeCrMnNiCo powders are mechanically alloyed with yttria at room and cryogenic temperatures using a novel cryogenic attritor. Mechanically alloyed powders are thus analyzed using a comprehensive set of experimental methods. Transmission electron microscopy reveals a stronger decrease of the oxide particle size upon cryogenic MA while at both temperatures the hereby observed particles in a size over 10 nm still show yttria crystal structure. Nevertheless, a substantial amount of yttria is refined below 10 nm forming nanoclusters without detectable crystal structure. Positron annihilation spectroscopy suggests a vacancy assisted dissolution of yttria into these nanoclusters while detailed investigation of these nanoclusters by atom probe tomography suggests smaller clusters in the cryoalloyed sample. The results imply that this vacancy assisted dissolution seems to be enhanced at cryogenic temperatures as first principle calculations and a change of the chemical composition of the nanoclusters imply higher vacancy densities at cryogenic MA temperatures stabilizing smaller nanoclusters.

Název v anglickém jazyce

From microscopic to atomistic scale: Temperature effect on yttria distribution in mechanically alloyed FeCrMnNiCo powder particles

Popis výsledku anglicky

Mechanical alloying (MA), the state-of-the-art processing step to produce oxide dispersion strengthened materials, shows a deficiency regarding time and costs hindering a broader applicability. Therefore, in order to investigate the effect of cryogenic MA temperatures and to understand the mechanism behind the refinement and dissolution of yttria, face-centered cubic FeCrMnNiCo powders are mechanically alloyed with yttria at room and cryogenic temperatures using a novel cryogenic attritor. Mechanically alloyed powders are thus analyzed using a comprehensive set of experimental methods. Transmission electron microscopy reveals a stronger decrease of the oxide particle size upon cryogenic MA while at both temperatures the hereby observed particles in a size over 10 nm still show yttria crystal structure. Nevertheless, a substantial amount of yttria is refined below 10 nm forming nanoclusters without detectable crystal structure. Positron annihilation spectroscopy suggests a vacancy assisted dissolution of yttria into these nanoclusters while detailed investigation of these nanoclusters by atom probe tomography suggests smaller clusters in the cryoalloyed sample. The results imply that this vacancy assisted dissolution seems to be enhanced at cryogenic temperatures as first principle calculations and a change of the chemical composition of the nanoclusters imply higher vacancy densities at cryogenic MA temperatures stabilizing smaller nanoclusters.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Journal of Alloys and Compounds

ISSN

0925-8388

e-ISSN

1873-4669

Svazek periodika

968

Číslo periodika v rámci svazku

DEC

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

12

Strana od-do

171850

Kód UT WoS článku

001073105500001

EID výsledku v databázi Scopus

2-s2.0-85169800944