Effect of Cr, Co, and Ti additions on the high-temperature oxidation behavior of Ni{sub 3}Al

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Oxidation of Metals

DOI:https://doi.org/10.1007/BF01046886· OSTI ID:283035

Choi, S C; Cho, H J; Lee, D B ^[1]

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1. Sung-Kyun-Kwan Univ., Suwon (Korea, Republic of)

The oxidation behavior of Ni{sub 3}Al+2.90 wt.% Cr, Ni{sub 3}Al+3.35 wt%Co, and Ni{sub 3}Al+2.99 wt.% Ti alloys was studied in 1 atm of air at 1000, 1100, and 1200{degrees}C. Isothermal tests revealed parabolic kinetics for all three alloys at all temperatures. Cyclic oxidation for 28 two-hour cycles produced little spallation at 1000{degrees}C, but caused partial spallation at 1100{degrees}C. Expecially, at 1200{degrees}C severe spallation in all three alloys was observed. Although additions of Cr, Co, or Ti to Ni{sub 3}Al alloys slightly increased the isothermal-oxidation resistance, the additions tended to decrease the cyclic-oxidation resistance. The major difference in the oxidation of the three alloys compared with the oxidation of pure, Ni{sub 3}Al alloys was the existence of small {alpha}-Al{sub 2}O{sub 3} particles in the middle of the {alpha}-Al{sub 2}O{sub 3} scale and the formation of irregularly shaped Kirkendall voids at the alloy-scale interface.

• Sponsoring Organization: USDOE
• OSTI ID: 283035
• 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

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
COBALT ALLOYS
NICKEL BASE ALLOYS
OXIDATION
TEMPERATURE RANGE 1000-4000 K
TITANIUM ALLOYS