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TiAl-based intermetallic compounds are being considered as high-temperature structural materials for aerospace and automobile applications. The isothermal and cyclic oxidation behaviour of two second- generation TiAl- based alloys, Ti-47Al-2Cr-0.2Si and Ti-48Al-2Cr-2Nb, having a fine-grained near-gamma microstructure was investigated with respect to Ti-48Al-2Cr (compositions in at %). Oxidation tests were conducted at 700 and 800 C in air. During oxidation a complex multi-phased and multi-layered scale was formed on the surface of the alloys. Initial results on the microstructure and phase content of the scales formed are reported. The Si-bearing alloy was susceptible to significant mass loss due to spallation of the oxide layer especially under long-term thermal-cyclic conditions. The Nb-bearing alloy showed superior oxidation resistance at isothermal as well as at thermal cycling exposure compared to the other materials tested.

Additional information

Authors: HOFMAN R, JRC Ispra (IT);SCHMUTZLER H J, JRC Ispra (IT);SUNDERKÖTTER J D, JRC Ispra (IT);STROOSNIJDER M F, JRC Ispra (IT);GLATZ W, Institut für Metallkunde und Werkstoffprüfung, Leoben (AT);CLEMENS H, Plansee AG, Technology Center, Reutte (AU)
Bibliographic Reference: Paper presented: EURO MAT 95, Venice (IT), September 25-28, 1995
Availability: Available from (1) as Paper EN 39291 ORA
Record Number: 199511457 / Last updated on: 1995-11-03
Original language: en
Available languages: en