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Burner Rig Hot Corrosion of a Single Crystal Ni-48Al-Ti-Hf-Ga Alloy

Published online by Cambridge University Press:  10 February 2011

J. A. Nesbitt ,
R. Darolia  and
M. D. Cuy
J. A. Nesbitt
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
R. Darolia
Affiliation:
General Electric Aircraft Engines (GEAE), Cincinnati, OH 45215
M. D. Cuy
Affiliation:
Dynacs, Lewis Research Center Group, Cleveland, OH 44135
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Abstract

The hot corrosion resistance of a single crystal Ni-48Al-1Ti-0.5Hf-0.2Ga‡ alloy was examined in a Mach 0.3 burner rig at 900C for 300 hours. The combustion chamber was doped with 2 ppmw synthetic sea salt. The hot corrosion attack produced a random mound morphology on the surface. Microstructurally, the hot corrosion attack appeared to initiate with oxide-filled pits which were often broad and shallow. At an intermediate stage, the pits increased in size to incorporate unoxidized Ni islands in the corrosion product. The rampant attack stage, which was observed only at sharp sample corners, was characterized by rapid inward growth of alumina in finger-like protrusions incorporating significant amounts of Al-depleted Ni islands. Aluminum consumption in the oxide fingers resulted in the growth of a γ' layer ahead of the advancing oxide fingers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK9.5.1
Copyright
Copyright © Materials Research Society 1999

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References

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