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Compressive creep behavior of an oxide-dispersion-strengthened CoCrFeMnNi high-entropy alloy
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SYSNO ASEP 0495933 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Compressive creep behavior of an oxide-dispersion-strengthened CoCrFeMnNi high-entropy alloy Author(s) Dobeš, Ferdinand (UFM-A) RID, ORCID
Hadraba, Hynek (UFM-A) RID, ORCID
Chlup, Zdeněk (UFM-A) RID, ORCID
Dlouhý, Antonín (UFM-A) RID, ORCID
Vilémová, Monika (UFP-V) RID, ORCID
Matějíček, Jiří (UFP-V) RID, ORCIDNumber of authors 6 Source Title Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. - : Elsevier - ISSN 0921-5093
Roč. 732, AUG (2018), s. 99-104Number of pages 6 s. Language eng - English Country CH - Switzerland Keywords superplasticity ; temperatures ; diffusion ; model ; flow ; High-entropy alloy ; Oxide dispersion strengthened alloy ; Creep ; Mechanical alloying ; Powder metallurgy ; Spark plasma sintering Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) Subject RIV - cooperation Institute of Plasma Physics R&D Projects GA17-23964S GA ČR - Czech Science Foundation (CSF) Institutional support UFM-A - RVO:68081723 ; UFP-V - RVO:61389021 UT WOS 000441486100013 EID SCOPUS 85049520234 DOI 10.1016/j.msea.2018.06.108 Annotation Creep tests of two equiatomic CoCrFeMnNi alloys were conducted in the temperature range from 973 K to 1073 K. The alloys were prepared by milling blends of powders of pure elements in a planetary ball mill and compacting by the spark plasma technique. Two variants of the alloys were prepared: (i) without and (ii) with the dispersion of oxides. Creep resistance was substantially improved by the presence of oxides. Diffusion creep controlled by lattice diffusion was suggested as a possible mechanism at low stresses. The effective diffusion coefficient calculated for Nabarro-Herring creep was comparable to the lattice diffusion coefficient of Ni in the same high-entropy alloy. At high stresses, the creep behavior was characterized by the presence of a threshold stress invoked by oxide particles. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2019
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