Počet záznamů: 1
Analysis of strengthening due to grain boundaries and annealing twin boundaries in the CrCoNi medium-entropy alloy
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SYSNO ASEP 0532624 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Analysis of strengthening due to grain boundaries and annealing twin boundaries in the CrCoNi medium-entropy alloy Tvůrce(i) Schneider, M. (DE)
George, E.P. (US)
Manescau, T.J. (FR)
Záležák, Tomáš (UFM-A) RID, ORCID
Hunfeld, J. (DE)
Dlouhý, Antonín (UFM-A) RID, ORCID
Eggeler, G. (DE)
Laplanche, G. (DE)Celkový počet autorů 8 Zdroj.dok. International Journal of Plasticity. - : Elsevier - ISSN 0749-6419
Roč. 124, JAN (2020), s. 155-169Poč.str. 5 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova hall-petch relationship ; stacking-fault energy ; mechanical-properties ; lattice dislocations ; elastic-moduli ; microstructural evolution ; tensile properties ; enhanced strength ; size dependence ; yield-stress ; NiCoCr ; Medium- and high-entropy alloys ; Hall-Petch effect ; Dislocation / grain boundary interactions ; Discrete dislocation dynamics Vědní obor RIV JG - Hutnictví, kovové materiály Obor OECD Materials engineering CEP GA14-22834S GA ČR - Grantová agentura ČR EF16_025/0007304 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Open access Institucionální podpora UFM-A - RVO:68081723 UT WOS 000502893800010 EID SCOPUS 85073259648 DOI 10.1016/j.ijplas.2019.08.009 Anotace CrCoNi exhibits the best combination of strength and ductility among all the equiatomic single-phase FCC subsets of the CrMnFeCoNi high-entropy alloy. Here, its yield strength was determined in compression as a function of grain size and temperature. Yield strength was also plotted as a function of rystallite size, which takes into account both annealing twin boundaries and grain boundaries. The resulting Hall-Petch slopes were straight lines but with different slopes that depend on the number of twin boundaries per grain. Scanning transmission electron microscopy of deformed specimens revealed the formation of dislocation pile-ups at grain and annealing twin boundaries indicating that the latter also act as obstacles to slip and contribute to strength. Using a simple pile-up model, the strengths of the grain and twin boundaries were estimated to lie in the range 900-1250 MPa. Assuming that they have the same strength, in the case of twin boundaries this strength corresponds roughly to the stress required to constrict Shockley partials, which suggests that dissociated dislocations have to become compact before they can cross the annealing twin boundaries. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2021 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0749641919303213?via%3Dihub
Počet záznamů: 1