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The effect of niobium implantation (2E16 and 1E17 ions/cm{2}) on the oxidation behaviour of a gamma-TiAl based intermetallic alloy Ti-48Al-2Cr in air at 800 C has been examined. Isothermal studies with exposure times up to 200 h and cyclic oxidation tests up to 800 h revealed a negligible effect for the low implantation dose. However, a remarkable decrease in oxidation rates was observed for the material implanted with 1E11 Nb ions/cm{2}. The improvement in the oxidation resistance appeared to be similar to that obtained by alloying of the intermetallic with a few atomic percent niobium. Possible mechanisms for the effect of niobium on the oxidation resistance of TiAl based intermetallics are discussed in view of the results obtained for the implanted material.

Additional information

Authors: STROOSNIJDER M F, JRC Ispra (IT);HOFMAN R, JRC Ispra (IT);LANZA F, JRC Ispra (IT);ZHENG N, Research Centre Juelich-IWE (DE);QUADAKKERS W J, Research Centre Juelich-IWE (DE);GIL A, Academy of Mining and Metallurgy, Krakow (PL)
Bibliographic Reference: Article: Oxidation of Metals (1996)
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