Počet záznamů: 1
Impact of interstitial elements on the stacking fault energy of an equiatomic CoCrNi medium entropy alloy: theory and experiments
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SYSNO ASEP 0560777 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Impact of interstitial elements on the stacking fault energy of an equiatomic CoCrNi medium entropy alloy: theory and experiments Tvůrce(i) Moravčík, I. (CZ)
Zelený, M. (CZ)
Dlouhý, Antonín (UFM-A) RID, ORCID
Hadraba, Hynek (UFM-A) RID, ORCID
Moravcikova-Gouvea, L. (CZ)
Papež, P. (CZ)
Fikar, Ondřej (UFM-A) ORCID
Dlouhý, Ivo (UFM-A) RID, ORCID
Raabe, D. (DE)
Li, Z. (DE)Celkový počet autorů 10 Zdroj.dok. Science and Technology of Advanced Materials. - : Taylor & Francis - ISSN 1468-6996
Roč. 23, č. 1 (2022), s. 376-392Poč.str. 19 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova ab initio calculations ; interstitials ; medium entropy alloy ; scanning transmission electron microscopy ; stacking fault energy ; strengthening Vědní obor RIV JG - Hutnictví, kovové materiály Obor OECD Materials engineering CEP EF16_025/0007304 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy GA14-22834S GA ČR - Grantová agentura ČR Způsob publikování Open access Institucionální podpora UFM-A - RVO:68081723 UT WOS 000847648200001 EID SCOPUS 85137694607 DOI 10.1080/14686996.2022.2080512 Anotace We investigated the effects of interstitial N and C on the stacking fault energy (SFE) of an equiatomic CoCrNi medium entropy alloy. Results of computer modeling were compared to tensile deformation and electron microscopy data. Both N and C in solid solution increase the SFE of the face-centered cubic (FCC) alloy matrix at room temperature, with the former having a more significant effect by 240% for 0.5 at % N. Total energy calculations based on density functional theory (DFT) as well as thermodynamic modeling of the Gibbs free energy with the CALPHAD (CALculation of PHAse Diagrams) method reveal a stabilizing effect of N and C interstitials on the FCC lattice with respect to the hexagonal close-packed (HCP) CoCrNi-X (X: N, C) lattice. Scanning transmission electron microscopy (STEM) measurements of the width of dissociated 1/2 dislocations suggest that the SFE of CoCrNi increases from 22 to 42-44 mJ center dot m(-2) after doping the alloy with 0.5 at. % interstitial N. The higher SFE reduces the nucleation rates of twins, leading to an increase in the critical stress required to trigger deformation twinning, an effect which can be used to design load-dependent strain hardening response. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2023 Elektronická adresa https://www.tandfonline.com/doi/full/10.1080/14686996.2022.2080512
Počet záznamů: 1