Abstract
The mixing enthalpies of liquid Cu–Hf–Ni alloys were determined at 1873 K by applying a high-temperature isoperibolic calorimeter. The investigation was performed along the sections x Cu/x Ni = 3/1, 1/3 at x Hf = 0–0.45 and x Cu/x Ni = 1/1 at x Hf = 0–0.40. The limiting partial mixing enthalpies of undercooled liquid hafnium in liquid Cu–Ni alloys are (–158 ± 13) kJ mol−1 (section x Cu/x Ni = 3/1), (–213 ± 11) kJ mol−1 (section x Cu/x Ni = 1/1), and (–229 ± 11) kJ mol−1 (section x Cu/x Ni = 1/3). The integral mixing enthalpies are negative in a wide composition range. The Redlich–Kister–Muggianu polynomial was used for the least square fit of the experimental results to obtain an analytical expression for the integral mixing enthalpy.
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The Ministry of Education and Science of Ukraine supported this work under the Grant 0115U003181.
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Agraval, P., Turchanin, M., Dreval, L. et al. Mixing enthalpy of liquid Cu–Hf–Ni alloys at 1873 K. J Therm Anal Calorim 128, 1753–1763 (2017). https://doi.org/10.1007/s10973-016-6060-z
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DOI: https://doi.org/10.1007/s10973-016-6060-z