Creep in directionally solidified NiAl–Mo eutectics

A directionally solidified NiAl–Mo eutectic and an NiAl intermetallic, having respective nominal compositions Ni–45.5Al–9Mo and Ni–45.2Al (at.%), were loaded in compression at 1073 and 1173 K. Formidable strengthening by regularly distributed Mo fibres (average diameter 600 nm, volume fraction 14%)...

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Bibliographic Details
Published inScripta materialia Vol. 65; no. 8; pp. 699 - 702
Main Authors Dudová, M., Kuchařová, K., Barták, T., Bei, H., George, E.P., Somsen, Ch, Dlouhý, A.
Format Journal Article
LanguageEnglish
Published United States Elsevier Ltd 01.10.2011
Subjects
Aluminides
Compressing
COMPRESSION
CREEP
Directional solidification
EUTECTICS
Fibres
High-temperature creep
Intermetallic compounds
Intermetallics
MATERIALS SCIENCE
Mo fibres
NiAl–Mo eutectic
Nickel
Nickel aluminides
Nickel base alloys
Nickel compounds
STRESSES
Transmission electron microscopy
Transmission electron microscopy
High-temperature creep
Directional solidification
NiAl–Mo eutectic
Mo fibres
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Summary:A directionally solidified NiAl–Mo eutectic and an NiAl intermetallic, having respective nominal compositions Ni–45.5Al–9Mo and Ni–45.2Al (at.%), were loaded in compression at 1073 and 1173 K. Formidable strengthening by regularly distributed Mo fibres (average diameter 600 nm, volume fraction 14%) was observed. The fibres can support compression stresses transferred from the plastically deforming matrix up to a critical stress of the order of 2.5 GPa, at which point they yield. Microstructural evidence is provided for the dislocation-mediated stress transfer from the NiAl to the Mo phase.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
DE-AC05-00OR22725
USDOE Office of Science (SC)
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2011.07.019