ВЛИЯНИЕ ДОБАВОК ГАЛЛИЯ НА ТЕПЛОЕМКОСТЬ И ТЕРМОДИНАМИЧЕСКИЕ ФУНКЦИИ АЛЮМИНИЕВОГО СПЛАВА АЖ5К10

Abstract

Heat capacity is the most important characteristic of substances, and from its change with temperature one can determine the type of phase transformation, Debye temperature, energy of vacancy formation, coefficient of electronic heat capacity and other properties. In this work, the heat capacity of the АЖ5К10 aluminum alloy was determined in the "cooling" mode, according to the known heat capacity of a reference sample made of M00 copper. To do that, the equations describing their cooling rates were obtained by processing the cooling curves of the samples from the alloys of the АЖ5К10-Ga system and the standard. Further, according to the experimentally found values of the cooling rates of the samples from the alloys and the standard, knowing their masses, the polynomials of the temperature dependence of the heat capacity of the alloys were established, which are described by a four-term equation. Using integrals of specific heat capacity, the temperature dependence of changes in enthalpy, entropy and Gibbs energy was calculated. The obtained dependences show that with an increase in temperature, the heat capacity, heat transfer coefficient, enthalpy and entropy of alloys increase, while the values of the Gibbs energy decrease. In that case, the addition of gallium reduces the heat capacity, enthalpy, and entropy of the АЖ5К10 alloy, while the value of the Gibbs energy increases