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Effect of Hf-Rich Particles on the Creep Life of a High-strength Nial Single Crystal AlloyAdditions of small amounts of Hf and Si to NiAl single crystals significantly improve their high-temperature strength and creep properties. However, if large Hf-rich dendritic particles formed during casting of the alloyed single crystals are not dissolved completely during homogenization heat treatment, a large variation in creep rupture life can occur. This behavior, observed in five samples of a Hf containing NiAl single crystal alloy tested at 1144 K under an initial stress of 241.4 MPa, is described in detail highlighting the role of interdendritic Hf-rich particles in limiting creep rupture life.
Document ID
19970027545
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Garg, A. (NASA Lewis Research Center Cleveland, OH United States)
Raj, S. V. (NASA Lewis Research Center Cleveland, OH United States)
Darolia, R. (General Electric Co. Cincinnati, OH United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1995
Publication Information
Publication: Proceedings of the Micromechanics of Advanced Materials Symposium
Subject Category
Metallic Materials
Report/Patent Number
NASA-TM-112890
NAS 1.15:112890
Report Number: NASA-TM-112890
Report Number: NAS 1.15:112890
Meeting Information
Meeting: Micromechanics of Advanced Materials
Country: United States
Start Date: January 1, 1995
Sponsors: Minerals, Metals and Materials Society
Accession Number
97N26475
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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