Abstract
The oxidation behaviour of Ti3(Ni,Cr)3CrSi6 and Ti4Ni4Si7 was studied in air both at 1000 and 1100 °C. The formation of the oxidation products and the phase transformation were characterized by in situ X-ray diffraction and SEM-FEG post-mortem observations. The crystal structure of Ti3(Ni,Cr)3CrSi6 was also determined using powder X-ray diffraction and Rietveld refinement in order to describe this phase as a pseudolamellar structure comparable to the one of Ti4Ni4Si7. Results evidenced that diffusion in solid state governs the oxidation rate of these silicides. Ti4Ni4Si7 oxidation rate was assessed as being one order of magnitude lower than the one of Ti3(Ni,Cr)3CrSi6, while this latter readily transformed into Ti4Ni4Si7 during the first time of oxidation. The understanding of this particular behaviour in which the oxidation rate of Ti3(Ni,Cr)3CrSi6 was not affected by the phase transformation implied to consider the crystallographic lamellar features of these compounds that play a major role in the diffusion of the most oxidizable elements.
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The authors wish to acknowledge the members of the common service of microscopy and microanalyses (SCMEM) of the Faculty of Sciences and Technologies of Nancy (France).
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Brix, F., Portebois, L., François, M. et al. Crystallographic Features of Phases Involved in the Oxidation of Ti3Ni3CrSi6 . Oxid Met 88, 257–266 (2017). https://doi.org/10.1007/s11085-017-9748-y
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DOI: https://doi.org/10.1007/s11085-017-9748-y