Hydrogen solubility in a titanium aluminide alloy |
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| Affiliation: | 1. Laboratoire Quartz, Supméca, 3, rue Fernand Hainaut, St Ouen Cedex 93407, France;2. Georgia Institute of Technology, Materials Science and Engineering, 771 Ferst Drive, N.W., J. Erskin Love Bldg, #286, Atlanta, GA 30332-0245, United States;3. Laboratoire de Dynamique et d''Optique des Matériaux, École Nationale des Sciences Appliquées Al Hoceima, Université Mohamed Premier, BP 03 Ajdir-Al Hoceima, B.P. 524 6000, Oujda, Maroc;4. Campus La salle Passy-Buzenval, Rueil-Malmaison 92500, France |
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| Abstract: | The dissolution of hydrogen in a titanum aluminide alloy based on Ti3Al, Ti-24 Al-11 Nb, has been measured as a function of temperature and hydrogen pressure. Both the terminal solubility and the overall solubility, or total uptake of hydrogen, were determined. The terminal solubility of hydrogen in the α2 matric phase increases with temperature, while the overall solubility decreases with increasing temperature in the high-temperature region. The partial molar heat of solution in the α2 phase was determined to be−(21.97 ± 1.46) kJ/mol [H], while the partial molar heat of formation of the hydride phase was −(70.29 ± 2.34) kJ/mol [H]. The standard partial molar free energy of hydrogen in the α2 phase in equilibrium with the hydride was −(74,060 ± 2000) + (87.8 ± 2.1) T J/mol [H]. |
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