Thermophysical properties of the Al_(83)Co_(10)Ce_7 glass-forming alloy in crystalline and liquid states

摘要

In the temperature range of T= 300-1900 K, covering the crystalline and liquid states, the electroconduc-tivity, thermal diffusivity, thermal conductivity, density and magnetic susceptibility of Al_(83)Co_(10)Ce_7 glass-forming alloy were studied. It is established that the values of electrical and thermal conductivity of the system investigated are relatively low (in comparison with pure aluminum). Analyzing temperature dependence of Lorentz function obtained, we found that the lattice contribution in total thermal conductivity is essential. In liquid state above T> 1700 K, the anomalous changes in electroresistivity and magnetic susceptibility of the alloy were revealed. These high-temperature anomalies are accompanied by neither detectable thermal effects nor significant changes of alloy density. It was found that the density of the alloy investigated is greater for the liquid state than for the solid one. The experimental results obtained are discussed in the frames of conjecture about existence of chemically interacting Al_2REM associates in the melt.