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Effects of Minor Alloying Additions on the Microstructure, Toughness, and Creep Strength of Directionally Solidified NiAl-31Cr-3Mo

Author:
Raj, S. V.
Published:
May 2001.
Physical Description:
1 electronic document
Additional Creators:
Salem, J. A. (Jonathan A.), 1960-, Whittenberger, J. D., and Locci, I. E.
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Summary:
A study of the effects of small (0.25 to 1.0 at%) fifth element additions to the structure and mechanical properties of directionally solidified (DS) NiAl-31Cr-3Mo has been undertaken. Essentially all the additions changed the as-DS'ed microstructure from lamellar eutectic grains to cells and, in some cases, introduced NiAl dendrites and/or third phases. In general the alloying additions did not improve strength or toughness over that possessed by the base composition; only Hf and, perhaps Ti, gave a minor increase in elevated temperature creep resistance. The lack of improvement in creep properties is probably due to inability to precipitation harden NiAl.
Other Subject(s):
Collection:
NASA Technical Reports Server (NTRS) Collection.
Note:
Document ID: 20010069501.
E-12674.
NAS 1.15:210899.
NASA/TM-2001-210899.
Third International Symposium on Structural Intermetallics; 23-25 Sep. 2001; Jackson Hole, WY; United States.
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No Copyright.
View MARC record | catkey: 15639349