Peculiarities in the oxidation behavior of the TiZrNbTa alloys – POSTER

Vilémová Monika - Institute of Plasma Physics of the Czech Academy of Sciences (Czech Republic)

Alloys composed of Ti, Zr, Nb, and Ta were prepared using Spark Plasma Sintering (SPS) technology. Unlike the traditional sintering process, the powder in the mold was divided into 19 compartments, which differed in the content of Zr, Nb, and Ta, while the Ti content remained constant across all compartments. The goal of this specific arrangement and procedure is to achieve a variable percentage distribution of elements in the resulting alloys throughout the entire prepared sample. The sample underwent homogenization annealing at 1400 °C for 168 hours in an argon atmosphere. In the prepared sample, we studied the oxide scales that formed during oxidation in synthetic air at 500 C, depending on the local chemical composition of the sample. Preliminary results indicate that in the compartments rich in Zr and Ta, tetragonal ZrO2 phase forms throughout the entire thickness of the oxide scale. This result does not align with the equilibrium Zr-O phase diagram, where the monoclinic phase is stable up to a temperature of 1173 °C.
This work was financially supported by Czech Science Foundation under the Project No. 22-24563S.

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