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Abstract

The effect of microstructure on the isothermal and cyclic oxidation behaviour of the intermetallic Ti-48Al-2Cr (at.%) alloy was investigated at 700 C in air up to 3000 h. Different microstructures obtained by various heat treatments, were used. Results of thermogravimetry showed a good oxidation resistance at 700 C against both isothermal and cyclic oxidation. The growth rate of the oxide scale showed no major relation to the microstructure of the base material. After equal exposure times, cyclic oxidation induced a higher oxidation rate compared to isothermal oxidation. Oxidation of Ti-48Al-2Cr in air, initially resulted in the formation of alpha-Al(2)O(3), TiO(2) (rutile), Ti(2)AlN and TiN, with the latter 2 near the scale/substrate interface. After longer exposure times, the mixed corrosion scale was overgrown by fast growing TiO(2). The oxide scales, formed under isothermal as well as under cyclic conditions were uniform.

Additional information

Authors: HAANAPPEL V A C, JRC Ispra (IT);STROOSNIJDER M F, JRC Ispra (IT);GLATZ W, Montanuniversität, Institut für Metallkunde und Werkstoffprüfung, Leoben (AT);CLEMENS H, Plansee Aktiengesellschaft, Technology Centre, Reutte (AT)
Bibliographic Reference: Article: Materials at High Temperatures (1996)
Record Number: 199710170 / Last updated on: 1997-04-01
Category: PUBLICATION
Original language: en
Available languages: en