Ceramic-ceramic. composites II |
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| Authors: | A.R. Hyde R.A.H. Edwards |
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| Affiliation: | 1. Gec Alsthom, Stafford, UK;2. JRC, Petten |
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| Abstract: | The growth mechanisms of the oxide scales of Ti-50Al and Ti-45Al-8Nb (at%) alloys at 900°C in air were investigated. The results revealed that the oxidation of γ-TiAl alloys during experiments was divided into four stages. The Ti-50Al alloy showed severe spallation after 3 h of oxidation. Nb addition to γ-TiAl alloys could improve the oxidation resistance effectively. The oxide scale growth was much slower and every oxide layer was more chemically uniform and homogeneous with Nb addition. The Ti-45Al-8Nb alloy showed no spallation even after 100 h of oxidation. |
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| Keywords: | Titanium aluminides based on TiAl Oxidation Microalloying |
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