Microstructure/oxidation/microhardness correlations in {gamma}-based and {tau}-based Al-Ti-Cr alloys
Book
·
OSTI ID:72551
- NASA Lewis Research Center, Cleveland, OH (United States)
The relationships between alloy microstructure and air oxidation kinetics and alloy microstructure and microhardness in the Al-Ti-Cr system for exposures at 800 C and 1,000 C were investigated. The relevant phases were identified as {tau} (L1{sub 2}), {gamma} (L1{sub 0}), r-Al{sub 2}Ti, TiCrAl (laves), and Cr{sub 2}Al. Protective alumina formation was associated with {tau}, Al-rich TiCrAl, and {gamma}/TiCrAl mixtures. Brittleness was associated with the TiCrAl phase and {tau} decomposition to Al{sub 2}Ti + Cr{sub 2}Al. It was concluded that two-phase {gamma} + TiCrAl alloys offer the greatest potential for oxidation resistance and room temperature ductility in the Al-Ti-Cr system.
- OSTI ID:
- 72551
- Report Number(s):
- CONF-941144--; ISBN 1-55899-265-0
- Country of Publication:
- United States
- Language:
- English
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