Original title: Creep in NiAl-Mo Eutectics
Authors: Dudová, Marie ; Barták, Tomáš ; Kuchařová, Květa ; Dlouhý, Antonín
Document type: Papers
Conference/Event: METAL 2011 /20./, Brno (CZ), 2011-05-18 / 2011-05-20
Year: 2011
Language: eng
Abstract: 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.
Keywords: creep; eutectics; in-situ composites
Project no.: CEZ:AV0Z20410507 (CEP), GA202/09/2073 (CEP)
Funding provider: GA ČR
Host item entry: METAL 2011 Conference Proceedings, ISBN 978-80-87294-22-2

Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0006937

Permalink: http://www.nusl.cz/ntk/nusl-110452


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