Фазовая диаграмма системы Cu-Tc

К оглавлению: Другие диаграммы (Others phase diargams)

Cu-Tc (Copper-Technetium) P.R. Subramanian and D.E. Laughlin The assessed Cu-Tc phase diagram is based on a simple thermodynamic model [ 83Nie]. As such, it should be regarded as schematic and should be only used as a starting point for future phase equilibria studies. X-ray studies by [65Nie] did not reveal the presence of any intermediate phases in the Cu-Tc system. No other reports are available on this system. The melting points of pure Cu and Tc are 1084.87 and 2155 C, respectively [Melt]. The assessed equilibrium phases are (1) the liquid, L, having a miscibility gap (L1 + L2); (2) the A1 fcc terminal solid solution, (Cu), with limited or no solid solubility of Tc; and (3) the A3 Mg-type cph terminal solid solution, (Tc), with no solid solubility of (Cu). The alloying behavior of Tc is expected to parallel that of Re [62Dar, 86Ven], and comparison of the phase diagram of Cu-Tc with that of Cu-Re indicates that the essential features are the same in both systems. 62Dar: J.B. Darby, Jr., D.J. Lam, L.J. Norton, and J.W. Downey, J. Less-Common Met., 4, 558-563 (1962). 65Nie: J. Niemiec, Nukleonika, 10, 23-29 (1965). 83Nie: A.K. Niessen, F.E. de Boer, R. Boom, P.F. de Chatel, W.C.M. Mattens, and A.R. Miedema, Calphad, 7(1), 51-70 (1983). 86Ven: M. Venkatraman and J.P. Neumann, Bull. Alloy Phase Diagrams, 7(6), 573- 574 (1986). Submitted to the APD Program. Complete evaluation contains 1 figure, 2 tables, and 9 references. 1