NDLI: Directional solidification and mechanical properties of nial-nialta alloys

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Directional solidification and mechanical properties of nial-nialta alloys

Content Provider	NASA Technical Reports Server (NTRS)
Author	Noebe, R. D. Oliver, B. F. Whittenberger, J. D. Chen, X. F. Johnson, D. R.
Copyright Year	1995
Description	Directional solidification of eutectic alloys is a promising technique for producing in-situ composite materials exhibiting a balance of properties. Consequently, the microstructure, creep strength and fracture toughness of directionally solidified NiAl-NiAlTa alloys were investigated. Directional solidification was performed by containerless processing techniques to minimize alloy contamination. The eutectic composition was found to be NiAl-15.5 at% Ta and well-aligned microstructures were produced at this composition. A near-eutectic alloy of NiAl-14.5Ta was also investigated. Directional solidification of the near-eutectic composition resulted in microstructures consisting of NiAl dendrites surrounded by aligned eutectic regions. The off-eutectic alloy exhibited promising compressive creep strengths compared to other NiAl-based intermetallics, while preliminary testing indicated that the eutectic alloy was competitive with Ni-base single crystal superalloys. The room temperature toughness of these two-phase alloys was similar to that of polycrystalline NiAl even with the presence of the brittle Laves phase NiAlTa.
File Size	1018149
Page Count	12
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19980028484
Archival Resource Key	ark:/13960/t3c01414f
Language	English
Publisher Date	1995-01-01
Access Restriction	Open
Subject Keyword	Metallic Materials Tantalum Alloys Compressibility Directional Solidification Crystals Nickel Alloys Ternary Alloys Aluminum Alloys Compressive Strength Creep Strength Brittleness Single Crystals Eutectic Alloys Fracture Strength Microstructure Solid Phases Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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