The kinetics of cooling of the aluminium grade of the A5N, its alloys doped with silicon, copper, and rare-earth metals in a wide temperature range were measured. It revealed that the process of cooling of the aluminium and its alloys has a relaxation behaviour. An experimental study of the specific heat and heat transfer coefficient of these substances is carried out. According to experimental data, the temperature dependence of the heat transfer coefficient for pure metals is calculated. It is shown that the values of heat transfer coefficients of copper, aluminium, and zinc are different. To determine the heat capacity of doped alloys for each group is recommended to define the coefficient of heat transfer of the initial alloy.
For the first time, the time dependences of the temperature of aluminum, zinc and zinc-aluminum alloys alloyed with II A group elements under spontaneous cooling mode were obtained; an anomalous course and two characteristic times of the cooling process were found, and their mechanism was explained; the temperature dependence of the thermophysical properties of the investigated metals and alloys was established; the temperature dependence of the coefficients of convective heat transfer and radiation of Al, Zn and Zn55Al and Zn5Al alloys was experimentally determined; the influence of the concentration of II A group elements and temperature on the heat capacity and thermodynamic functions of Zn55Al and Zn5Al alloys was revealed.
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