Thermodynamic investigation of the A2/B2 region of the Fe-Al system by Knudsen effusion mass spectrometry |
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| Authors: | L. Bencze D. D. Raj D. Kath L. Singheiser K. Hilpert W. A. Oates J. Herrmann |
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| Affiliation: | 1.the Department of Physical Chemistry,Roland E?tv?s University,Budapest,Hungary;2.the Materials Chemistry Division,Indira Gandhi Centre for Atomic Research (IGCAR),Kalpakkam,India;3.the Research Center Jülich,Jülich,Germany;4.the Technical University Aachen,Germany;5.the Technical University Darmstadt,Germany;6.the Institute for Materials Research,University of Salford,Salford,United Kingdom;7.Sulzer Innotec,Winterthur,Switzerland |
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| Abstract: | The vaporization of Fe-Al alloys has been investigated in the temperature range of 1140 to 1600 K by Knudsen effusion mass spectrometry. Eleven different compositions were examined in the composition range between 30 and 51 at. pct Al, mostly in the B2 region of the phase diagram. The partial pressures and thermodynamic activities of both Fe and Al were evaluated: directly from the measured ion intensities for a component in both the alloy and the pure element, I M + /I M +0 , and also from the ion-intensity ratios of the alloy components, I Al + /I Fe + , by means of a Gibbs-Duhem integration. Reliable partial and integral molar enthalpies and entropies of mixing have been obtained by mass spectrometry for this system for the first time. Nearly temperature-independent integral enthalpies and entropies of mixing over the wide temperature range investigated were found, with the mixing entropies being large and negative. |
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