Directional solidification of eutectic alloys is a promising technique for producing m-situ composite materials exhibiting a balance of properties. Consequently, the microstructure, creep strength and fracture toughness of directionally solidified NiAI NiAITa alloys were investigated. Directional solidification was performed by containerless processing techniques to minimize alloy contamination• The eutectic composition was found to be NiAI 15.5 at"/,, Ta and well-aligned microstructures were produced at this composition.A near-eutectic alloy of NiAI 14.5Ta was also investigated. Directional solidification of the near-eutectic composition resulted in microstructures consisting of NiAI 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 polycryslalline NiAI even with the presence of the brittle Laves phase NiAITa.
AIAA-87-9226 4. Tltle and Subtitle 5. Report Date Fluoride Salts and Container Materials for Thermal Energy Storage Applications in the Temperature Range 973 to 1400 K 6. Performlng Organization Code 506-41 -3A 7. Author@) 8. Performing Organlzatlon Report NO.
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