Number of the records: 1  

Creep and microstructure in directionally solidified NiAl(Cr)-Mo alloys

  1. 1.
    SYSNO ASEP0450284
    Document TypeA - Abstract
    R&D Document TypeNení vybrán druh dokumentu
    TitleCreep and microstructure in directionally solidified NiAl(Cr)-Mo alloys
    Author(s) Dudová, Marie (UFM-A)
    Bei, H. (US)
    Somsen, C. (DE)
    George, E.P. (US)
    Dlouhý, Antonín (UFM-A) RID, ORCID
    Number of authors5
    Source TitleBook of Abstracts. 17th International Conference on the Strength of Materials (ICSMA-17). - Brno : Ústav fyziky materiálů AV ČR, v. v. i., 2015 / Dlouhý A. ; Kunz L. - ISBN 978-80-87434-07-9
    S. 85-85
    Number of pages1 s.
    Publication formPrint - P
    ActionICSMA-17 International Conference on the Strength of Materials /17./
    Event date09.08.2015-14.08.2015
    VEvent locationBrno
    CountryCZ - Czech Republic
    Event typeWRD
    Languageeng - English
    CountryCZ - Czech Republic
    KeywordsHigh-temperature creep ; In-situ composite ; Directional solidification ; Eutectics
    Subject RIVJI - Composite Materials
    R&D ProjectsGA202/09/2073 GA ČR - Czech Science Foundation (CSF)
    Institutional supportUFM-A - RVO:68081723
    AnnotationWe present NiAl(Cr)-Mo directionally solidified alloys exhibiting high temperature strength due to regularly distributed fine eutectic phases Mo or Cr. These eutectics exhibited minimum creep rates that were up to seven orders of magnitude lower than the corresponding minimum creep rates of the NiAl matrix alloy and pure Mo or Cr single phases. We present detailed analysis of dislocation structures observed in the as-grown crystals as well as in the eutectics after creep. Clear evidence is provided showing that Mo and Cr phases contain essentially no dislocations before creep and the appropriate dislocation densities after creep. These results suggest that the immense hightemperature strength of the NiAl(Cr)-Mo eutectics can be attributed to the load bearing capacity of dislocation-free nano-reinforcements. These phases support the load transferred from the plastically deforming NiAl matrix up to the point when they yield. A statistically relevant yielding of the reinforcement is reflected in the gradual increase of creep rate with accumulated creep strain.
    WorkplaceInstitute of Physics of Materials
    ContactYvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
    Year of Publishing2016
Number of the records: 1  

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