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Double minimum creep of single crystal Ni-base superalloys
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SYSNO ASEP 0464792 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Double minimum creep of single crystal Ni-base superalloys Author(s) WU, X. (DE)
Wollgramm, P. (DE)
Somsen, C. (DE)
Dlouhý, Antonín (UFM-A) RID, ORCID
Kostka, A. (DE)
Eggeler, G. (DE)Number of authors 6 Source Title Acta Materialia. - : Elsevier - ISSN 1359-6454
Roč. 112, JUN (2016), s. 242-260Number of pages 19 s. Language eng - English Country GB - United Kingdom Keywords Single crystal Ni-base superalloys ; Primary creep ; Transmission electron microscopy ; Dislocations ; Stacking faults Subject RIV JG - Metallurgy R&D Projects GA14-22834S GA ČR - Czech Science Foundation (CSF) Institutional support UFM-A - RVO:68081723 UT WOS 000377326400024 EID SCOPUS 84964483770 DOI 10.1016/j.actamat.2016.04.012 Annotation 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. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2017
Number of the records: 1