Abstract
The enthalpy of formation of the ordered B2 phases in the Fe-Al and Fe-Ni-Al systems was measured with very good accuracy using a special, laboratory-built differential-solution calorimeter. The measurements were performed at 1073 K as a function of composition, with an accuracy of about 1 pct. The enthalpy of formation of B2-FeAl is most negative for the composition Fe0.50Al0.50 (−36.29 kJ/mol). Compounds with Al contents less than about 40 at. pct show a deviation from the linear dependence of the enthalpy of formation with composition which prevails for Al contents larger than 40 at. pct. Upon replacing Fe by Ni while maintaining a constant Al content, the enthalpy of formation of B2-(Fe,Ni)Al compounds becomes more negative. With decreasing Al content and for a constant Fe/Ni ratio, the enthalpy of formation of the ternary phase becomes less negative.
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Breuer, J., Grün, A., Sommer, F. et al. Enthalpy of formation of B2-Fe1−x Al x and B2-(Ni,Fe)1−x Al x . Metall Mater Trans B 32, 913–918 (2001). https://doi.org/10.1007/s11663-001-0077-8
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DOI: https://doi.org/10.1007/s11663-001-0077-8