Deformation and phase transformations during the cyclic oxidation of Ni-Al and Ni-Pt-Al

B. A. Pint; S. A. Speakman; C. J. Rawn; Y. Zhang

doi:10.1007/s11837-006-0068-y

Deformation and phase transformations during the cyclic oxidation of Ni-Al and Ni-Pt-Al

B. A. Pint, S. A. Speakman, C. J. Rawn, Y. Zhang

Materials Science and Technology Div

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

The reversible high-temperature γ′ to β phase transformation may be critical to explaining the unusual high-temperature oxidation behavior of (Ni,Pt) Al alloys and coatings. During high-temperature, high-frequency (1 h) cyclic oxidation in dry, flowing O₂, unprecedented macroscopic deformation was observed in two-phase (γ′+β) cast specimens of Hf-doped Ni-Pt-Al at 1,150°C and Hf-doped Ni-Pt-Al at 1,100° and 1,150°C. Outside of this two-phase field or when the cycle frequency was decreased to 100 h, no deformation was observed. Using high-temperature x-ray diffraction in an inert environment, the β-to-γ′ phase ratio was observed to increase above 1,000°C, causing a 2.5% volume change. The addition of platinum appeared to lower the transformation temperature consistent with the deformation observed in cast alloys and rumpling of simple and platinum-modified aluminide coatings.

Original language	English
Pages (from-to)	47-52
Number of pages	6
Journal	JOM
Volume	58
Issue number	1
DOIs	https://doi.org/10.1007/s11837-006-0068-y
State	Published - Jan 2006

Funding

The authors thank J.D. Vought, L.D. Chitwood, G. Garner, and H. Longmire at Oak Ridge National Laboratory for assistance with the experimental work; J. Smialek at NASA Glenn Research Center for useful discussions; and I.G. Wright, A. Payzant, M.P. Brady, and P.F. Tor-torelli for comments on the manuscript. This research was originally sponsored by the U.S. Department of Energy, Advanced Turbine Systems Program and currently by the Office of Coal and Power R&D, Office of Fossil Energy,

Funders	Funder number
Office of Coal and Power R&D
U.S. Department of Energy
Office of Fossil Energy

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abstract = "The reversible high-temperature γ′ to β phase transformation may be critical to explaining the unusual high-temperature oxidation behavior of (Ni,Pt) Al alloys and coatings. During high-temperature, high-frequency (1 h) cyclic oxidation in dry, flowing O2, unprecedented macroscopic deformation was observed in two-phase (γ′+β) cast specimens of Hf-doped Ni-Pt-Al at 1,150°C and Hf-doped Ni-Pt-Al at 1,100° and 1,150°C. Outside of this two-phase field or when the cycle frequency was decreased to 100 h, no deformation was observed. Using high-temperature x-ray diffraction in an inert environment, the β-to-γ′ phase ratio was observed to increase above 1,000°C, causing a 2.5% volume change. The addition of platinum appeared to lower the transformation temperature consistent with the deformation observed in cast alloys and rumpling of simple and platinum-modified aluminide coatings.",

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Deformation and phase transformations during the cyclic oxidation of Ni-Al and Ni-Pt-Al

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