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 1500oC .The change in the temperature coefficient of the resistivity of the melts on heating to 1500oC we interpreted using the Nagel–Tauc model.
Highlights
CuNiAl, CuNiAlCo, CuNiAlCoFe alloys of equiatomic compositions are the multi-principal element alloys (MPEAs), the complex concentrated alloys (CCAs), the high-entropy alloys (HEAs)
We showed that the hysteresis appears only when the CuNiAlCo alloy is heated to 2070 K (Fig. 2)
Based on the available microgeterogenity concept the liquid CuNiAl, CuNiAlCo, CuNiAlCoFe alloys were qualitatively studied by measuring the viscosity and resistivity during the heating/cooling
Summary
CuNiAl, CuNiAlCo, CuNiAlCoFe alloys of equiatomic compositions are the multi-principal element alloys (MPEAs), the complex concentrated alloys (CCAs), the high-entropy alloys (HEAs). A rationale for the HEAs is that the configurational entropy contribution to the total free energy in alloys with five or more major elements can stabilize the solid-solution state relative to multiphase microstructures. It is important factor in the obtaining of high-entropy alloys is the high cooling rate of metal during crystallization which makes it impossible to disintegration of solid solution and formation of chemical compounds. The inferior cast ability and compositional segregation of HEAs are obstacles for their technological applications To solve these problems we proposed a novel strategy to design HEAs using the microgeterogenity concept. The values the electrical resistivity and viscosity of liquid Cu-Nibinary alloys were measured [15,16].Similar results for the ternary system Cu-Ni-Al are not known to the authors
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