Enthalpy of mixing of liquid and undercooled liquid ternary and quaternary Cu-Ni-Si-Zr alloys

The partial and the integral enthalpies of mixing of liquid Si-Zr, Cu-Si-Zr, Ni-Si-Zr and Cu-Ni-Si-Zr alloys with mole fractions of zirconium in the range from 0 up to 30 at.% have been determined by high-temperature isoperibolic calorimetry at 1575-1720 K. The data of the constituent ternaries were described using a regular association model. The enthalpy of mixing of liquid and undercooled liquid Cu-Ni-Si-Zr alloys were estimated for all compositions on the basis of the model description of the constituent binary and ternary systems. (C) 2002 Elsevier Science B.V. All rights reserved.