Effects of interstitial oxygen on microstructure and mechanical properties of Ti-48Al-2Cr-2Nb with fully lamellar and duplex microstructures |
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| Authors: | M Lamirand J -L Bonnentien S Guérin G Ferrière J -P Chevalier |
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| Affiliation: | (1) the Centre d’Etudes de Chimie Métallurgique, Institut des Sciences Chimiques Seine Amont, CNRS, 94407 Vitry-sur-Seine, France;(2) the Chaire des Matériaux Industriels Métalliques et Céramiques, Conservatoire National des Arts et Métiers, 75003 Paris, France;(3) Centre d’Etudes de Chimie Métallurgique, Institut des Sciences Chimiques Seine Amont, France;(4) Chaire des Matériaux Industriels Métalliques et Céramiques, Conservatoire National des Arts et Métiers, France |
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| Abstract: | 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 theα phase, interstitial oxygen stabilizes the lamellar microstructure with respect toγ grains, with higher than equilibrium values for theα
2 volume fraction. For specimens cooled from theα +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 kinetics
of theα toα +γ transformation. Thus, interstitial oxygen will have a strong effect on microstructures obtained by continuous cooling fromα, but significantly less on those, such as the duplex microstructure, obtained by long treatment in theα +γ phase field. In general, increased O content is well correlated with reduced ductility. Finally, the role of interstitial
oxygen on this phase transformation is discussed. |
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