Modification of Microstructure for Improved Oxidation Resistance in γ-Based Ti-Al-X Alloys |
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| Authors: | M P Brady J L Smialek E D Verink D T Hoelzer R Stone |
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| Affiliation: |
a MS 106-1 NASA Lewis Research Center, Cleveland, OH
b Department of Materials Science and Engineering, University of Florida, Gainesville, FL |
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| Abstract: | The effect of microstructural refinement on the oxidation behavior of γ + laves Ti-45Al-15Cr and γ + σ Ti-40Al-27Nb was investigated. A fine, uniform γ + laves microstructure in Ti-45Al-15Cr resulted in protective alumina scale formation over most of the sample surface at 800°C and 1000°C in air. In contrast, the oxidation resistance of this same alloy was severely degraded by a coarse γ + laves microstructure. The oxidation behavior of Ti-40Al-27Nb at 1200°C in air was poor. Refinement of the γ + σ microstructure in this alloy was not effective in improving oxidation resistance. The mechanistic reasons for these effects, and the implications for improved oxidation resistance through microstructural refinement are discussed. |
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