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000051985 084__ $$2WoS$$aMetallurgy & Metallurgical Engineering
000051985 1001_ $$0P:(DE-Juel1)VDB62057$$aLakshmi-Narsimhan, T. S.$$b0$$uFZJ
000051985 245__ $$aActivity Measurements on the Al-rich Region of Ni-Al System - A High Temperature Mass Spectrometric Study : Dedicated to Prof. Dr. Ferdinand Sommer on the occasion of his 65th birthday
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000051985 440_0 $$015321$$aInternational Journal of Materials Research = Zeitschrift für Metallkunde$$v97$$x1862-5282$$y4
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000051985 520__ $$aSystematic vaporisation studies on the Ni-Al system with 0.32 <= x(Ni) <= 0.50 were carried out in the temperature range 1077-1592 K by Knudsen effusion mass spectrometry. While Al(g) was the vapour species observed over all the samples, Ni(g) was also detected over samples with the compositions x(Ni) = 0.50 and 0.49. From the p(Al)-T relations, activities of Al, and subsequently activities of Ni (by Gibbs-Duhem integration) were obtained. Moreover, partial and integral molar enthalpies and Gibbs energies of formation were evaluated. The variation of activities and other thermodynamic properties with composition are discussed. The enthalpy and Gibbs energy of formation of Ni0.5Al0.5(s) at 298.15 K were obtained as Delta H-f(m)o = -62.1 +/- 4.2 U mol and A(f)G(m)(o) = -57.7 +/- 1.2 U mol respectively. This is the first time that a systematic mass spectrometric investigation has been carried out on the aluminium rich region of Ni-Al system where the vacancy concentration in the NiAl phase can be as high as 10%.
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000051985 65320 $$2Author$$anickel aluminides
000051985 65320 $$2Author$$aKnudsen effusion mass spectrometry
000051985 65320 $$2Author$$aactivities
000051985 65320 $$2Author$$apartial and integral molar properties
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000051985 7001_ $$0P:(DE-Juel1)VDB28018$$aKath, D.$$b1$$uFZJ
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