Creep strength variations related to grain boundaries in the equiatomic CoCrFeMnNi high-entropy alloy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F24%3A00603669" target="_blank" >RIV/68081723:_____/24:00603669 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.webofscience.com/wos/woscc/full-record/WOS:001241231400001" target="_blank" >https://www.webofscience.com/wos/woscc/full-record/WOS:001241231400001</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.scriptamat.2024.116165" target="_blank" >10.1016/j.scriptamat.2024.116165</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Creep strength variations related to grain boundaries in the equiatomic CoCrFeMnNi high-entropy alloy

Popis výsledku v původním jazyce

Compression and tensile creep of the equiatomic CoCrFeMnNi highentropy alloy was investigated at 1073 K and 1253 K. The highentropy alloy was either in the polycrystalline or monocrystalline solid solution state. We find that the polycrystalline variant creeps significantly faster than the monocrystalline variant at low applied stresses. Additionally, the stress exponent is lower for the polycrystalline samples (n 3) than the monocrystalline samples (n 5), which, according to a standard interpretation of creep data, implies a curious transition from viscous glide to climbcontrolled creep. Such a transition is difficult to rationalize given that our alloy composition and crystal structure remain the same and only the microstructure changes from polycrystalline to monocrystalline. We offer an alternative to the standard view where grain boundaries, which are only present in the polycrystalline material, serve as efficient sinks for dislocations and thus contribute to faster creep.

Název v anglickém jazyce

Creep strength variations related to grain boundaries in the equiatomic CoCrFeMnNi high-entropy alloy

Popis výsledku anglicky

Compression and tensile creep of the equiatomic CoCrFeMnNi highentropy alloy was investigated at 1073 K and 1253 K. The highentropy alloy was either in the polycrystalline or monocrystalline solid solution state. We find that the polycrystalline variant creeps significantly faster than the monocrystalline variant at low applied stresses. Additionally, the stress exponent is lower for the polycrystalline samples (n 3) than the monocrystalline samples (n 5), which, according to a standard interpretation of creep data, implies a curious transition from viscous glide to climbcontrolled creep. Such a transition is difficult to rationalize given that our alloy composition and crystal structure remain the same and only the microstructure changes from polycrystalline to monocrystalline. We offer an alternative to the standard view where grain boundaries, which are only present in the polycrystalline material, serve as efficient sinks for dislocations and thus contribute to faster creep.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GA14-22834S" target="_blank" >GA14-22834S: Fázová stabilita a plasticita slitin se střední až vysokou entropií</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Scripta Materialia

ISSN

1359-6462

e-ISSN

1872-8456

Svazek periodika

249

Číslo periodika v rámci svazku

AUG

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

6

Strana od-do

116165

Kód UT WoS článku

001241231400001

EID výsledku v databázi Scopus

2-s2.0-85192467075