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Abstract

The oxidation behaviour of the gamma-TiAl based Intermetallic alloys Ti-42AL-8.5Nb-0.2W-(Si, B, Y), Ti-46Al-8.5Nb-1Ta-(C, Si, B, Y), and Ti-47Al-2Cr-2Mo-(Si, B) (composition in at.%) in air at 700, 800 and 900°C was studied in comparison with Ti-48Al-2Nb-2Cr. Isothermal oxidation tests were performed in humidified synthetic air for 150 h. Cyclic oxidation experiments were executed in static laboratory air with each cycle corresponding with a period of 1 h at test and 12 min at ambient temperature. The results revealed for Ti-47Al-2Cr-2Mo- (Si, B a lower isothermal and cyclic oxidation resistance than for Ti-48Al-2Nb-2Cr. This was explained by a lower beneficial effect of molybdenum (compared with niobium) on the oxidation resistance of this type of gamma-TiAl based alloy. An improvement of the isothermal and cyclic oxidation resistance, when compared with that of Ti-48Al-2Nb-2Cr was obtained with both high niobium-containing alloys Ti-42AL-8.5Nb-0.2W-(Si, B, Y) and Ti-46Al-8.5Nb-1Ta-(C, Si, B, Y). Here, Ti-46Al-8.5Nb-1Ta-(C, Si, B,Y) showed the lowest isothermal oxidation rate and highest cyclic oxidation resistance.

Additional information

Authors: HAANAPPEL V A C, European Commission, Joint Research Centre, Institute for Health and Consumer Protection, Ispra (IT);STROOSNIJDER M F, European Commission, Joint Research Centre, Institute for Health and Consumer Protection, Ispra (IT);CLEMENS H, Institute for Materials Research, GKKS Research Centre, Geesthacht (DE)
Bibliographic Reference: An article published in: Intermetallics 10 (3), (2002), pp. 293-305
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