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Statements

Subject Item
n2:RIV%2F68081723%3A_____%2F11%3A00376019%21RIV12-AV0-68081723
rdf:type
skos:Concept n13:Vysledek
dcterms:description
We report on creep in NiAl-Mo ternary eutectic and NiAl intermetallic, having respective nominal compositions Ni-45.5Al-9Mo and Ni-45.2Al (at.%). These alloys were directionally solidified in a high-temperature optical floating zone furnace. The eutectic alloy exhibited a well-aligned rod-like microstructure, consisting of NiAl matrix and 14% (by volume) continuous Mo-fibres oriented along a [001]-crystal growth direction. Cylindrical [001]-oriented specimens were loaded in compression at temperatures in a range 1073 – 1173 K. Formidable strengthening by regularly distributed fine fibres (typical diameter, 400 nm) was observed which resulted in minimum creep rates of the NiAl-Mo eutectic that were seven orders of magnitude lower than the corresponding minimum creep rates of the NiAl matrix. Preliminary microstructural investigations suggested that the strengthening effect is due to an interaction between Mo fibres and subgrain boundaries that form in the course of creep. This interaction leads to an increase of dislocation density in the vicinity of fibres and to an efficient redistribution of stresses in the microstructure. We report on creep in NiAl-Mo ternary eutectic and NiAl intermetallic, having respective nominal compositions Ni-45.5Al-9Mo and Ni-45.2Al (at.%). These alloys were directionally solidified in a high-temperature optical floating zone furnace. The eutectic alloy exhibited a well-aligned rod-like microstructure, consisting of NiAl matrix and 14% (by volume) continuous Mo-fibres oriented along a [001]-crystal growth direction. Cylindrical [001]-oriented specimens were loaded in compression at temperatures in a range 1073 – 1173 K. Formidable strengthening by regularly distributed fine fibres (typical diameter, 400 nm) was observed which resulted in minimum creep rates of the NiAl-Mo eutectic that were seven orders of magnitude lower than the corresponding minimum creep rates of the NiAl matrix. Preliminary microstructural investigations suggested that the strengthening effect is due to an interaction between Mo fibres and subgrain boundaries that form in the course of creep. This interaction leads to an increase of dislocation density in the vicinity of fibres and to an efficient redistribution of stresses in the microstructure.
dcterms:title
Creep in NiAl-Mo Eutectics Creep in NiAl-Mo Eutectics
skos:prefLabel
Creep in NiAl-Mo Eutectics Creep in NiAl-Mo Eutectics
skos:notation
RIV/68081723:_____/11:00376019!RIV12-AV0-68081723
n13:predkladatel
n14:ico%3A68081723
n4:aktivita
n16:P n16:Z
n4:aktivity
P(GA202/09/2073), Z(AV0Z20410507)
n4:dodaniDat
n20:2012
n4:domaciTvurceVysledku
n8:5076633 n8:1023705 n8:3249514 n8:1987445
n4:druhVysledku
n9:D
n4:duvernostUdaju
n18:S
n4:entitaPredkladatele
n21:predkladatel
n4:idSjednocenehoVysledku
192237
n4:idVysledku
RIV/68081723:_____/11:00376019
n4:jazykVysledku
n6:eng
n4:klicovaSlova
creep; eutectics; in-situ composites
n4:klicoveSlovo
n10:creep n10:in-situ%20composites n10:eutectics
n4:kontrolniKodProRIV
[E7094A133F25]
n4:mistoKonaniAkce
Brno
n4:mistoVydani
Ostrava
n4:nazevZdroje
METAL 2011 Conference Proceedings
n4:obor
n17:JG
n4:pocetDomacichTvurcuVysledku
4
n4:pocetTvurcuVysledku
4
n4:projekt
n11:GA202%2F09%2F2073
n4:rokUplatneniVysledku
n20:2011
n4:tvurceVysledku
Dudová, Marie Kuchařová, Květa Dlouhý, Antonín Barták, Tomáš
n4:typAkce
n22:WRD
n4:zahajeniAkce
2011-05-18+02:00
n4:zamer
n15:AV0Z20410507
s:numberOfPages
5
n5:hasPublisher
TANGER, spol. s r.o.
n19:isbn
978-80-87294-22-2