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Article: Effects of Interstitial Oxygen on Microstructure and Mechanical Properties of Ti-48Al-2Cr-2Nb with Fully Lamellar and Duplex Microstructures
- Article from:
- Metallurgical and Materials Transactions
- Article date:
- August 1, 2006
- Author:
CopyrightCopyright Minerals, Metals & Materials Society Aug 2006. Provided by ProQuest LLC. (Hide copyright information)
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The effect of added oxygen in the range of 1000 to 4000 wt ppm on the microstructures of a Ti-48Al-2Cr-2Nb alloy has been investigated and compared to the microstructures for a high-purity alloy. For specimens cooled from the α phase, interstitial oxygen stabilizes the lamellar microstructure with respect to γ grains, with higher than equilibrium values for the α^sub 2^ volume fraction. For specimens cooled from the α + γ phase field, the lamellar microstructure still tends to be favored by oxygen, but it is found that the phase volume fractions are not significantly different from equilibrium values. This suggests that interstitial O essentially reduces the ...