Počet záznamů: 1  

On the stress and temperature dependence of low temperature and high stress shear creep in Ni-base single crystal superalloys

  1. 1.
    SYSNO ASEP0534084
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevOn the stress and temperature dependence of low temperature and high stress shear creep in Ni-base single crystal superalloys
    Tvůrce(i) Bürger, D. (DE)
    Dlouhý, Antonín (UFM-A) RID, ORCID
    Yoshimi, K. (JP)
    Eggeler, G. (DE)
    Celkový počet autorů4
    Číslo článku139961
    Zdroj.dok.Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. - : Elsevier - ISSN 0921-5093
    Roč. 795, SEP (2020)
    Poč.str.10 s.
    Jazyk dok.eng - angličtina
    Země vyd.CH - Švýcarsko
    Klíč. slovasteady-state creep ; electron-microscopy ; power-law ; microstructure ; deformation ; anisotropy ; reduction ; metals ; faults ; Ni-base superalloy single crystals ; Shear creep deformation ; Low-temperature high-stress creep ; Stress exponent ; Activation energy ; Dislocation mechanisms
    Vědní obor RIVJG - Hutnictví, kovové materiály
    Obor OECDMaterials engineering
    CEPEF16_025/0007304 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy
    Způsob publikováníOpen access
    Institucionální podporaUFM-A - RVO:68081723
    UT WOS000573282500001
    EID SCOPUS85088875133
    DOI10.1016/j.msea.2020.139961
    AnotaceIn the present work, we investigate the stress and temperature dependence of low-temperature (750 + 20 degrees C) and high-stress (300 + 20 MPa) shear creep of a Ni-base single crystal superalloy. From continuous isothermal experiments and stress and temperature change tests the stress exponent n and the apparent activation energy Q(app) of the phenomenological Sherby-Dorn equation were determined for the two macroscopic crystallographic shear systems (MCSS) [01 (1) over bar](111) and [11 (2) over bar] (111). The activation parameters of creep, the stress exponents and the apparent activation energies were identified as 16 and 620 kJ/mol (MCSS: [01 (1) over bar](111)) and 14 and 460 kJ/mol (MCSS: [11 (2) over bar] (111)). We show that during shear creep testing these phenomenological parameters do not change between the early (0.5-1% strain) and later stages of creep (4.5-5% strain), in contrast to what was observed for uniaxial tensile testing. The results are discussed in the light of what is known about stress and temperature dependencies of deformation rates in the creep literature and in view of the recent work by Burger et al., 2020, who combined shear creep testing with analytical transmission electron microscopy to identify the elementary deformation mechanism, which governs low temperature and high stress creep.
    PracovištěÚstav fyziky materiálu
    KontaktYvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
    Rok sběru2021
    Elektronická adresahttps://www.sciencedirect.com/science/article/pii/S0921509320310339?via%3Dihub
Počet záznamů: 1  

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