The effect of microstructure on the oxidation behaviour of Ti-46.5Al-4(Cr,Nb,Ta,B) and Ti-47Al-4(Cr,Nb,Mo,B)
The isothermal and cyclic oxidation behaviour- of the inter-metallic alloys Ti-46.5Al-4(Cr,Nb, Ta,B) and Ti-47 Al-4(Cr,Nb,Mo,B) were studied at 700, 800, and 900 °C in air. Emphasis was placed on the effect of microstructure, i.e. fine-grained near gamma and coarse-grained fully lamellar on the oxidation resistance. The results have shown that the oxidation kinetics of the alloys under investigation were affected by the microstructure. Under the defined conditions, in the case of the tantalum-containing alloy the fine-grained structure, and in the case of the molybdenum-containing alloy the coarse-grained fully lamellar structure showed a better oxidation resistance. It was found that the effect was more pronounced under cyclic rather than under isothermal oxidation conditions. Furthermore, isothermal and cyclic oxidation experiments have shown that Ti-46.5Al-4(Cr,Nb,Ta,B) is more resistant against the defined oxidation conditions than Ti-47 Al-4(Cr,Nb,Mo,B).
Bibliographic Reference: An article published in: Materials at High Temperatures, 19(1) 19-24 (2002)
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Record Number: 200214985 / Last updated on: 2002-08-19
Original language: en
Available languages: en