Creep in Directionally Solidified NiAl-Mo Eutectics

Journal Article · Fri Dec 31 23:00:00 EST 2010 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2011.07.019· OSTI ID:1023304

Dudova, Marie ^[1]; Kucharova, Kveta ^[1]; Bartak, Tomas ^[1]; Bei, Hongbin ^[2]; George, Easo P ^[2]; Somsen, Ch. ^[3]; Dlouhy, A. ^[4]

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1. Institute of Physics, Czech Republic
2. ORNL
3. Ruhr University, Bochum, Germany
4. Institute of Physics of Materials, Brno, Czech Republic

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.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1023304
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 8 Vol. 65; ISSN 1359-6462
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPRESSION
CREEP
EUTECTICS
STRESSES