Combined synchrotron X-ray diffraction, dilatometry and electrical resistivity in situ study of phase transformations in a Ti2AlNb alloy - Université de Lorraine Access content directly
Journal Articles Materials Characterization Year : 2020

Combined synchrotron X-ray diffraction, dilatometry and electrical resistivity in situ study of phase transformations in a Ti2AlNb alloy

V.A. Esin
M. Dadé
  • Function : Author
B. Denand
J. Delfosse
  • Function : Author
P. Sallot
  • Function : Author

Abstract

Phase transformations in near Ti2AlNb alloy occurring on cooling of 10 °C min−1 from 1020 °C were studied in situ using high energy X-ray diffraction and electrical resistivity measurements coupled with simultaneous dilatometric analysis. From Rietveld refinement of X-ray data, it was established that high temperature range from about 870 to 1020 °C contained partially ordered β phase. The degree of long-range order was of 0.6 at 1020 °C and decreased slowly with temperature decrease and fast when O-phase was formed. The formation of O-Ti2AlNb phase started from about 870 °C and consisted of two stages: (i) fast transformation of partially ordered β into O phase at higher temperatures followed by (ii) slow transformation of fully disordered β into O-phase at lower temperatures. The appearance of O-phase was accompanied by important volume decrease of the alloy as recorded using dilatometry as well as by a decrease of electrical resistivity. The transformations temperatures revealed by high energy X-ray diffraction, dilatometry and electrical resistivity were in good agreement. The obtained results were discussed using thermodynamic simulations carried out with Thermo-Calc software and TCTI2 database.

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Materials
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Dates and versions

hal-02955731 , version 1 (26-09-2022)

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Attribution - NonCommercial

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V.A. Esin, R. Mallick, M. Dadé, B. Denand, J. Delfosse, et al.. Combined synchrotron X-ray diffraction, dilatometry and electrical resistivity in situ study of phase transformations in a Ti2AlNb alloy. Materials Characterization, 2020, 169, pp.110654. ⟨10.1016/j.matchar.2020.110654⟩. ⟨hal-02955731⟩
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