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Influence of molybdenum on the creep properties of nickel-base superalloy single crystalsThe Mo content of an alloy series based on Ni-6 wt pct Al-6 wt pct Ta was systematically varied from 9.8 to 14.6 wt pct, in order to ascertain the influence of Mo on the creep properties of single crystals. The optimum initial gamma-gamma prime microstructure for raft development and creep strength was established in each alloy before testing. It was found that, as the Mo content increased from 9.8 to 14.0 percent, the magnitude of the lattice mismatch increased; upon reaching 14.6 percent, a degradation of mechanical properties occurred due to the precipitation of a third phase. These results suggest that small refractory metal content and initial gamma-prime variations can profoundly affect mechanical properties.
Document ID
19900038178
Document Type
Reprint (Version printed in journal)
Authors
Mackay, R. A.
(NASA Lewis Research Center Cleveland, OH, United States)
Nathal, M. V.
(NASA Lewis Research Center Cleveland, OH, United States)
Pearson, D. D.
(United Technologies Research Center East Hartford, CT, United States)
Date Acquired
August 14, 2013
Publication Date
February 1, 1990
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 21A
ISSN: 0360-2133
Subject Category
Metallic Materials
Distribution Limits
Public
Copyright
Other
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