Abstract
Pressure-composition-isotherms for Ta–Fe–H systems have been investigated in the temperature range 673–873 K. Tantalum–iron alloys (Ta–xFe, x = 0, 1.6 and 3.2 atom % Fe) were prepared by arc melting using high purity elements. The equilibrium solid solubility of hydrogen in the alloys decreases with an increase of iron content. Thermodynamic parameters of the solution process—the Gibb’s free energy, enthalpy, and entropy, for each of the solutions have been calculated. The relative partial molar enthalpy becomes less negative with increase in iron content, whereas the entropy values are nearly constant for these alloys. The solubility changes were explained on the basis of change in lattice strain energy of tantalum due to iron addition.
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Acknowledgements
The authors are thankful to Dr. Sanjay Kumar Rai from ISUD, RRCAT for his help in XRD measurements and Mr. Ashok Kumar Bhakar, RRCAT, Indore for his valuable help during XRD data analysis.
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Taxak, M., Kumar, S., Sheelvantra, S. et al. Effect of iron on the solubility of hydrogen in tantalum. J Mater Sci 49, 8471–8477 (2014). https://doi.org/10.1007/s10853-014-8557-9
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DOI: https://doi.org/10.1007/s10853-014-8557-9