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Phase Transformations in Third Generation Gamma Titanium Aluminides: Ti-45Al-(5, 10) Nb-0.2B-0.2C

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Abstract

Third generation γ-titanium aluminides with nominal compositions Ti–45Al–5Nb–0.2B–0.2C and Ti–45Al–10Nb–0.2B–0.2C were investigated to identify the phase transformation and their morphological stability with temperature. Electron microscopy and differential scanning calorimetry were employed for the characterization of phases and for recording the corresponding transformations, respectively. It has been inferred that the order–disorder transformation temperatures α2 → α increased with increasing Niobium (Nb), while the α-transus temperature decreases. The stability of the microstructure for both alloys with temperature were also investigated. Mass change measured for the heating rates 20 °C s−1 and 30 °C s−1 reveals that the alloy Ti–45Al–10Nb–0.2–0.2C shows stability up to 1100 °C, and the alloy Ti–45Al–5Nb–0.2B–0.2C is stable up to 900 °C. The orientation relationship between the phases indicates that with the change in shape of the α phase from lamellar to equiaxed, it deviates from the Blackburn orientation relationship.

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Acknowledgments

This work was carried out under the aegis of the GTMAP programme of the Aeronautics Research and Development Board (AR&DB), Government of India. The funding provided by AR&DB is gratefully acknowledged. The department of Advanced Facility of microscopy and microanalysis (AFMM) of IISc is also acknowledged by the authors for providing the characterizations facilities. The authors also acknowledge the help provided by Dr. S. Banumathy of DMRL Hyderabad.

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Authors and Affiliations

  1. Department of Materials Engineering, Indian Institute of Science, Bangalore, 560012, India

    Nitish Bibhanshu, Rashi Rajanna & Satyam Suwas

  2. Ti-Alloy Group, Defence Metallurgical Research Laboratory, Hyderabad, 500058, India

    Amit Bhattacharjee

  3. Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA

    Nitish Bibhanshu

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  1. Nitish Bibhanshu
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Manuscript submitted February 26, 2021; accepted September 22, 2021.

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Bibhanshu, N., Rajanna, R., Bhattacharjee, A. et al. Phase Transformations in Third Generation Gamma Titanium Aluminides: Ti-45Al-(5, 10) Nb-0.2B-0.2C. Metall Mater Trans A 52, 5300–5313 (2021). https://doi.org/10.1007/s11661-021-06469-1

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