Počet záznamů: 1
Double minimum creep of single crystal Ni-base superalloys
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SYSNO ASEP 0464792 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Double minimum creep of single crystal Ni-base superalloys Tvůrce(i) WU, X. (DE)
Wollgramm, P. (DE)
Somsen, C. (DE)
Dlouhý, Antonín (UFM-A) RID, ORCID
Kostka, A. (DE)
Eggeler, G. (DE)Celkový počet autorů 6 Zdroj.dok. Acta Materialia. - : Elsevier - ISSN 1359-6454
Roč. 112, JUN (2016), s. 242-260Poč.str. 19 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Single crystal Ni-base superalloys ; Primary creep ; Transmission electron microscopy ; Dislocations ; Stacking faults Vědní obor RIV JG - Hutnictví, kovové materiály CEP GA14-22834S GA ČR - Grantová agentura ČR Institucionální podpora UFM-A - RVO:68081723 UT WOS 000377326400024 EID SCOPUS 84964483770 DOI 10.1016/j.actamat.2016.04.012 Anotace Low 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. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2017
Počet záznamů: 1