INFLUENCE OF ANNEALING TEMPERATURE AND PULSED MAGNETIC FIELD ON PHYSICAL PROPERTIES OF ALUMINUM ALLOY AK9 DURING ARTIFICIAL AGING

An urgent task of physical materials science is to improve the properties of metals and metal alloys necessary for operation. Despite significant progress in metal science and metallurgy, in particular in the creation of new alloys superior in their properties to alloys of the Al ‒ Si system, silumins will occupy a leading position in industry for a long time, which is associated with their manufacturability when used in almost all types of casting. Various methods of heat treatment are used to improve the structure and physico-mechanical properties of metal alloys. One of them is the technology of artificial aging, with the help of which it is possible to significantly change the physical and mechanical properties of metal alloys. The results of a comprehensive experimental study of the effect of a pulsed magnetic field on the aging process of AK9 aluminum alloy are presented. Information is provided on the chemical composition, modes of thermal and thermomagnetic treatments, and the main experimentally observed patterns of changes in microhardness and fine structure parameters of AK9 aluminum alloy aged for 4 hours at temperatures from 120 to 250 °C in a pulsed magnetic field with an amplitude of 557.2 kA/m and in its absence. It was found that the pulsed magnetic field significantly affects the strength properties and structure of the AK9 aluminum alloy, while it does not change the stages of the aging process. When a pulsed magnetic field is applied, the average size of coherent scattering blocks becomes larger, and the dislocation density and relative microdeformation are smaller than in its absence, which indicates the formation of a less pronounced crystal lattice. 

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