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Phase, composition and structure changes of CoCrNi-based concentrated alloys resulting from high temperature oxidation

  1. 1.
    0531256 - ÚFP 2021 RIV CH eng J - Článek v odborném periodiku
    Vilémová, Monika - Hadraba, Hynek - Weiss, Zdeněk - Lukáč, František - Csáki, Štefan - Chlup, Zdeněk - Matějíček, Jiří - Chráska, Tomáš
    Phase, composition and structure changes of CoCrNi-based concentrated alloys resulting from high temperature oxidation.
    Materials. Roč. 13, č. 10 (2020), č. článku 2276. E-ISSN 1996-1944
    Grant CEP: GA ČR(CZ) GA17-23964S; GA MŠk(CZ) EF16_019/0000760
    Grant ostatní:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
    Institucionální podpora: RVO:61389021 ; RVO:68378271 ; RVO:68081723
    Klíčová slova: Cr C dissolution 23 6 * CrMnFeCoNi * FeCoNiCr * High-entropy alloys * Medium-entropy alloys * Oxide dispersion strengthening * Passivation * Spark plasma sintering * Y-Ti complex oxide nanoparticles * Y O particles 2 3
    Kód oboru RIV: JG - Hutnictví, kovové materiály; BM - Fyzika pevných látek a magnetismus (FZU-D); JG - Hutnictví, kovové materiály (UFM-A)
    Obor OECD: Materials engineering; Condensed matter physics (including formerly solid state physics, supercond.) (FZU-D); Materials engineering (UFM-A)
    Impakt faktor: 3.623, rok: 2020
    Způsob publikování: Open access
    https://www.mdpi.com/1996-1944/13/10/2276

    In this work, CoCrNi, FeCoCrNi and CoCrFeMnNi concentrated alloys with a Y-Ti oxide particle dispersion were prepared by mechanical alloying and Spark Plasma Sintering. The alloy consists of an FCC Ni-based matrix with a Y-Ti oxide dispersion and additional phases of Cr23C6 and Cr2O3. The effect of Fe, Mn, and Y-Ti oxide particles on the formation of oxide scales and the composition of the adjacent CoCrNi and FeCoCrNi alloys was studied. It was found that alloys without Mn in their composition form a protective Cr2O3 scale. The Cr23C6 particles provide an alternative mechanism for balancing the chromium loss during the oxidation. Y and Ti from the oxide particles participate in the formation of the protective oxide scales. Fe promotes Y and especially Ti diffusion through the Cr2O3 scale, resulting in the formation of Ti-depleted regions in the alloy. The findings will serve for the further development of these new materials.
    Trvalý link: http://hdl.handle.net/11104/0310183

     
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