Number of the records: 1
Creep and microstructure in directionally solidified NiAl(Cr)-Mo alloys
- 1.
SYSNO ASEP 0450284 Document Type A - Abstract R&D Document Type Není vybrán druh dokumentu Title Creep 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, ORCIDNumber of authors 5 Source Title Book 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. 85-85Number of pages 1 s. Publication form Print - P Action ICSMA-17 International Conference on the Strength of Materials /17./ Event date 09.08.2015-14.08.2015 VEvent location Brno Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords High-temperature creep ; In-situ composite ; Directional solidification ; Eutectics Subject RIV JI - Composite Materials R&D Projects GA202/09/2073 GA ČR - Czech Science Foundation (CSF) Institutional support UFM-A - RVO:68081723 Annotation We 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. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2016
Number of the records: 1