VISCOSITY AND ELECTRICAL RESISTIVITY OF LIQUID CuNiAl, CuNiAlCo, CuNiAlCoFe ALLOYS OF EQUIATOMIC COMPOSITIONS

Abstract

We measured the resistivity of liquid CuNi, CuNiAl, CuNiAlCo, CuNiAlCoFe alloys of equiatomic compositions using the rotating magnetic field method to obtain information on their liquid structures. We saw the alloys of equiatomic composition as the high-entropy alloys (HEAs). The results discussed in framework of conception a microheterogeneous structure of a metallic melt. A conclusion is made about cause of modification of temperature dependence of resistivity of liquid HEAs due this microheterogeneous structure. All the investigated melts demonstrate the change in the temperature coefficient of the resistivity for heating and cooling. It was determining the temperature T* is the temperature of the changes the microheterogeneous structure of a metallic melt. The value of temperature T* for all alloys is 1500^oC .The change in the temperature coefficient of the resistivity of the melts on heating to 1500^oC we interpreted using the Nagel–Tauc model.