A thermodynamic study of copper-iron and copper-cobalt liquid alloys by mass spectrometry |
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| Authors: | L. Timberg J. M. Toguri T. Azakami |
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| Affiliation: | (1) J. Roy Gordon Research Laboratory, Inco Metals Co., Sheridan Park, Mississauga, L5K 1Z9 Ontario, Canada;(2) Department of Metallurgy and Materials Science, University of Toronto, M5S 1 A4 Toronto, Ontario, Canada;(3) Department of Metallurgy, Materials Science and Metal Processing, Tohoku University, Sendai, Japan |
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| Abstract: | The thermodynamic activities in the liquid Cu-Fe and Cu-Co binary systems were measured by a high temperature mass spectrometric technique. From the obtained data, the heats of mixing in the Cu-Co liquid binary were calculated. Both the Cu-Fe and Cu-Co systems are thermodynamically similar, with large positive deviations from ideality in the activities. The activity coefficients in the liquid Cu-Co system at 1823 K were found to be symmetrical and can be expressed by lnγCu= 1.76X Co 2 The heat of mixing in the liquid Cu-Co system was found to be described by a cubic function δHm = −17.9 Co 3 − 7.6X Co 2 + 25.5Co (kJ/mol) The activity coefficients in the liquid Cu-Fe system at 1873 K were found to satisfy two quadratic formalisms in the binary In γCu = 2.10X Fe 2 − 0.13 0.65 ≤X Fe ≤ 1 In γFe = 1.79X Cu 2 + 0.04 0 ≤X Fe ≤ 0.65 |
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