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On the influence of alloy composition on the oxidation performance and oxygen-induced phase transformations in Ti–(0–8) wt%Al alloys

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Abstract

Adopting a high-throughput combinatorial approach, a compositionally graded Ti–xAl (0 ≤ x ≤ 8 wt%) specimen was prepared to conduct a rapid systematic investigation of the influence of composition and exposure time on the oxidation performance of the titanium-rich section of the binary Ti–Al system. The compositionally graded specimen was solution heat treated and subjected to oxidation tests at 650 °C for different exposure times. The morphology, structure, and composition of the oxide scale as well as the microstructural changes in the base material were studied across the entire composition range, using a suite of characterization techniques. The observations revealed the presence of Al2O3 in the topmost layer of the oxide scale in addition to TiO2, indicating its early formation during oxidation. An increase in Al concentration improves the scaling rate of Ti; however, this is observed only for extended exposure times (i.e., 50 and 100 h), and a parabolic oxidation law is obeyed in the composition-time domain. The formation of the α2 phase (Ti3Al) also takes place for relatively higher Al contents (i.e., 8 wt%).

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Acknowledgements

This work was conducted within the NSF I/UCRC Center for Advanced Non-Ferrous Structural Alloys (CANFSA) which is a joint industry-university center between the Colorado School of Mines and the University of North Texas. The authors gratefully acknowledge the support of NSF (Award Number 1134873) and the support and active mentorship of the industrial partners. The authors also gratefully acknowledge the facilities available at the University of North Texas’ Center for Advanced Research and Technology (CART).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Iowa State University, Ames, IA, 50011, USA

    P. Samimi, D. A. Brice & P. C. Collins

  2. Department of Materials Science and Engineering, University of North Texas, Denton, TX, 76203, USA

    R. Banerjee

  3. Department of Metallurgical & Materials Engineering, Colorado School of Mines, Golden, CO, 80401, USA

    M. J. Kaufman

  4. Center for Advanced Non-Ferrous Structural Alloys (CANFSA), an NSF-I/UCRC between the Iowa State University (Ames, IA) and the Colorado School of Mines (Golden, CO), USA

    P. Samimi, R. Banerjee, M. J. Kaufman & P. C. Collins

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  1. P. Samimi
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  2. D. A. Brice
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  4. M. J. Kaufman
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  5. P. C. Collins
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Correspondence to P. Samimi.

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Samimi, P., Brice, D.A., Banerjee, R. et al. On the influence of alloy composition on the oxidation performance and oxygen-induced phase transformations in Ti–(0–8) wt%Al alloys. J Mater Sci 51, 3684–3692 (2016). https://doi.org/10.1007/s10853-015-9681-x

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  • DOI: https://doi.org/10.1007/s10853-015-9681-x

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