High-temperature oxidation behavior of pure Ni{sub 3}Al
- Sung-Kyun-Kwan Univ., Suwon (Korea, Republic of)
The high-temperature oxidation behaviour of pure Ni{sub 3}Al alloys in air was studied above 1000{degrees}C. In isothermal oxidation tests between 1000 and 1200{degrees}C, Ni{sub 3}Al showed parabolic oxidation behavior and displayed excellent oxidation resistance. In cyclic oxidation tests between 1000 and 1300{degrees}C, Ni{sub 3}Al exhibited excellent oxidation resistance between 1000 and 1200{degrees}C, but drastic spalling of oxide scales was observed at 1300{degrees}C. When Ni{sub 3}Al was oxidized at 1000{degrees}C, Al{sub 2}O{sub 3} was present as {theta}-Al{sub 2}O{sub 3} in a whisker form. But, at 1100{degrees}C the gradual transformation of initially formed metastable {theta}-Al{sub 2}O{sub 3} to stable {alpha}-Al{sub 2}O{sub 3} was observed after oxidation for about 20 hr. After oxidation at 1200{degrees}C for long times, the formation of a thick columnar-grain layers of {alpha}-Al{sub 2}O{sub 3} was observed beneath a thin and fine-grain outer layer of {alpha}-Al{sub 2}O{sub 3}. The oxidation mechanism of pure Ni{sub 3}Al is described.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 283033
- Journal Information:
- Oxidation of Metals, Journal Name: Oxidation of Metals Journal Issue: 1-2 Vol. 46; ISSN OXMEAF; ISSN 0030-770X
- Country of Publication:
- United States
- Language:
- English
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