Abstract
A mass spectrometer has been used to study activities of the constituents in liquid Cu-Mg and Cu-Ca alloys. Activities and heats of mixing have been determined from a series of measurements of the ratios of the ion current intensity of the solution components according to the Belton-Fruehan treatment. The activities in both systems exhibit negative deviation from ideality and tend to approach an ideal behavior at higher temperatures. The terms of RT ln γ Cu and RT ln γ Mg show very small temperature dependence within the present experimental range and agree well with the values reported by Garg et al. for the Cu-Mg system. The terms of RT ln γ Ca and RT ln γ Cu are independent of temperature and in excellent agreement with the values assessed by Risold et al. for the Cu-Ca system. Relative partial molar enthalpy and integral heat of mixing in the liquid Cu-Mg and Cu-Ca systems were also estimated.
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This article is based on a presentation made in the “Geoffrey Belton Memorial Symposium,” held in January 2000, in Sydney, Australia, under the joint sponsorship of ISS and TMS.
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Hino, M., Nagasaka, T. & Takehama, R. Activity measurement of the constituents in liquid Cu-Mg and Cu-Ca alloys with mass spectrometry. Metall Mater Trans B 31, 927–935 (2000). https://doi.org/10.1007/s11663-000-0069-0
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DOI: https://doi.org/10.1007/s11663-000-0069-0