Abstract
Nitrogenation of Fe-2 pct Al alloys produces a large number of A1N particles and a large density of dislocations in the ferrite. We have measured the amount of nitrogen absorbed reversibly as a function of nitrogen activity at 500°C by alloys nitrogenated under different conditions. We have also measured the reversible hydrogen absorption at room temperature as a function of hydrogen fugacity and with varying amounts of preadsorbed nitrogen. Some preparative treatments produce some AIN-ferrite interface that can reversibly adsorb nitrogen at 500°C and hydrogen at 24.5°C upon sites not occupied by nitrogen. In the absence of such interface, the nitrogen absorption isotherms and the nitrogen-free hydrogen absorption isotherms are adequately described by a model based upon the thermodynamics of stressed bodies. However, the observed decrease of absorbed hydrogen caused by preabsorbed nitrogen is not explicable by the simple idea that a site occupied by nitrogen is unavailable to hydrogen.
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Podgurski, H.H., Oriani, R.A. Nitrogenation of Fe-Al alloys. III: Absorption of hydrogen in nitrogenated Fe-Al alloys. Metall Trans 3, 2055–2063 (1972). https://doi.org/10.1007/BF02643214
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DOI: https://doi.org/10.1007/BF02643214