THERMODYNAMIC PROPERTIES OF BINARY IRON-ALUMINUM ALLOYS. Final Report

Eldridge, Jeffrey I.; Komarek, K. L.

doi:10.2172/4115185

Cited by 15 publications

(42 citation statements)

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“…pct Al) is very similar to our value, the good agreement between the activities obtained by us and by Radcliffe et al must be valid at different temperatures as well. In contrast, the Al activity values of Eldridge and Komarek [17] obtained using the isopiestic method, as well as those of Jacobson and Mehrotra [19] obtained using KEMS, are significantly lower than our values. Since the data at 1573 K, obtained from the thermodynamic assessment of Reference 25, agree with the data of Jacobson and Mehrotra, it can be concluded that Reference 25 must include also the results of Reference 19.…”

Section: Discussioncontrasting

confidence: 95%

“…Various types of calorimetric measurements of the mixing enthalpy have been made, [8][9][10][11][12][13][14] as have measurements of the Al chemical potential by electromotive force methods [15,16] and by an isopiestic vapor-pressure method. [17] Ichise [18] first used the Knudsen effusion mass spectrometric (KEMS) method in an investigation of the A2 region at 1673 K. Later, a KEMS investigation of 10 different alloy compositions (between 9.7 and 65.6 at. pct Al) at 1573 K was carried out by Jacobson and Mehrotra.…”

Section: The Ordered Intermetallic Phases Feal and Nial Andmentioning

confidence: 99%

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Thermodynamic investigation of the A2/B2 region of the Fe-Al system by Knudsen effusion mass spectrometry

Bencze,

Raj,

Kath

et al. 2003

Metall Mater Trans A

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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, , and also from the ion-intensity ratios of the alloy components, , 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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Section: Discussioncontrasting

confidence: 95%

Section: The Ordered Intermetallic Phases Feal and Nial Andmentioning

confidence: 99%

Thermodynamic investigation of the A2/B2 region of the Fe-Al system by Knudsen effusion mass spectrometry

Bencze,

Raj,

Kath

et al. 2003

Metall Mater Trans A

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“…The activities in Si-Mg liquid alloys were measured by the isopiestic method [22], phase diagram data [23], and emf technique [24,25]. The activity of Mg in dilute solution with silicon has been measured through chemical equilibrium technique and Knudsen effusion method [9,10].…”

Section: Si-mg Alloysmentioning

confidence: 99%

Thermodynamic activities in silicon binary melts

2012

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The thermodynamic activities in the silicon binary melts with Al, Ca, Mg, Fe, Ti, Zn, Cu, Ag, Au, Sn, Pb, Bi, Sb, Ga, In, Pt, Ni, Mn and Rh are studied. The silicon activities along the liquidus are calculated through a quasi-regular solution model using the recently determined liquidus constants for the silicon binary systems. The silicon activities at its melting point are calculated considering regular solution approximation. The activities of the other melt component at the silicon melting point are also calculated through the graphical integration of the GibbsDuhem equation for the activity coefficient, which are further utilized to determine the corresponding activities along the liquidus. The calculated activities are presented graphically, and it is indicated that the results are consistent with the reported activity data in the literature. The activities in the dilute solutions are also calculated graphically. Moreover, the activities of particular dilute solute elements in silicon are calculated through a simple formula, which is a function of the liquidus constants.

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“…The activity of aluminum in different Fe -Al alloys required for calculating the equilibrium concentrations of aluminum subchlorides and other species in equilibrium with the aluminide substrate were available in the literature [23]. Table 1 shows the partial pressure of various species in the reactor at 1173 K in equilibrium with pure aluminum.…”

Section: This Workmentioning

confidence: 99%