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The high temperature oxidation behaviour of different TiAl-microstructures, as obtained by various heat treatments, was studied. The structures subjected to either isothermal or cyclic oxidation were near gamma, nearly lamellar and duplex. Oxidation tests were performed at 700 and 800 C in air. At 800 C neither the isothermal nor the cyclic oxidation behaviour of the three structures studied differ significantly. SEM/EDX and secondary neutral mass spectrosocpy (SNMS) analysis reveal that initially an Al(2)O(3) rich scale is formed, which at longer times becomes overgrown by a poor protective TiO(2) based scale. At 800 C the cyclic oxidation resistance is relatively poor and, after 150 one hour cycles, spallation is observed. In contrast, the isothermal and cyclic oxidation resistance at 700 C is much better and oxide scales remain intact for a prolonged period of time.

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Authors: HOFMAN R, JRC Ispra (IT);STROOSNIJDER M F, JRC Ispra (IT);GLATZ W, Montanuniversität, Institut für Metallkunde und Werkstoffprüfung, Leoben (AT);CLEMENS H, Plansee Aktiengesellschaft, Technology Center, Reutte (AT)
Bibliographic Reference: Paper presented: International Symposium on Gamma Titanium Aluminides, Las Vegas (US), February 13-16, 1995
Availability: Available from (1) as Paper EN 38896 ORA
Record Number: 199510584 / Last updated on: 1995-05-03
Original language: en
Available languages: en