Počet záznamů: 1  

Double minimum creep of single crystal Ni-base superalloys

  1. 1.
    SYSNO ASEP0464792
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevDouble minimum creep of single crystal Ni-base superalloys
    Tvůrce(i) WU, X. (DE)
    Wollgramm, P. (DE)
    Somsen, C. (DE)
    Dlouhý, Antonín (UFM-A) RID
    Kostka, A. (DE)
    Eggeler, G. (DE)
    Celkový počet autorů6
    Zdroj.dok.Acta Materialia. - : Elsevier - ISSN 1359-6454
    Roč. 112, JUN (2016), s. 242-260
    Poč.str.19 s.
    Jazyk dok.eng - angličtina
    Země vyd.GB - Velká Británie
    Klíč. slovaSingle crystal Ni-base superalloys ; Primary creep ; Transmission electron microscopy ; Dislocations ; Stacking faults
    Vědní obor RIVJG - Hutnictví, kovové materiály
    CEPGA14-22834S GA ČR - Grantová agentura ČR
    Institucionální podporaUFM-A - RVO:68081723
    UT WOS000377326400024
    EID SCOPUS84964483770
    DOI10.1016/j.actamat.2016.04.012
    AnotaceLow temperature (750°C) and high stress (800 MPa) creep curves of single crystal superalloy ERBO/1 tensile specimens loaded in the (001) direction show two creep rate minima. Strain rates decrease towards a first sharp local creep rate minimum at 0.1% strain (reached after 30 min). Then deformation rates increase and reach an intermediate maximum at 1% (reached after 1.5 h). Subsequently, strain rates decrease towards a global minimum at 5% (260 h), before tertiary creep (not considered in the present work) leads to final rupture. We combine high resolution miniature creep testing with diffraction contrast transmission electron microscopy and identify elementary processes which govern this double-minimum type of creep behavior. We provide new quantitative information on the evolution of microstructure during low temperature and high stress creep, focusing on γ-channel dislocation activity and stacking fault shear of the γ′-phase. We discuss our results in the light of previous work published in the literature and highlight areas in need of further work.
    PracovištěÚstav fyziky materiálu
    KontaktYvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
    Rok sběru2017