THE ROLE OF ALLOYING IMPURITIES AND A CONSTANT MAGNETIC FIELD IN THE FORMATION OF THE MICROSTRUCTURE AND MICROHARDNESS OF AGED ALUMINUM ALLOYS Al-Zn, Al-Zn-Mg AND Al-Zn-Mg-Cu

10.25712/ASTU.1811-1416.2026.02.010

Abstract

The article presents the results of a comprehensive experimental study of the microstructure, microhardness and fine-structure parameters of the technical aluminum alloy B95pch (Al-Zn-Mg-Cu) and model aluminum alloys alloyed with Zn and Mg, which were subjected to artificial aging in a constant magnetic field with a 557.0 kA/m. It has been established that the application of a constant magnetic field for 4 hours at a temperature of 140°C to the aging process of the technical aluminum alloy B95pch contributes to an increase in the microhardness of the alloy up to 21%, which indicates the presence of a negative magnetoplastic effect. At the same time, no significant magnetoplastic effect was observed for Al-Zn-Mg triple model alloy: all microhardness values are within the measurement error. The X-ray method revealed a decrease in the average size of coherent scattering blocks, an increase in revealed microdeformation and dislocation density in both alloys during aging in a constant magnetic field. A correalation was found between the composition of the alloys, taking into account alloying impurities, and changes in their physical and mechanical properties during aging, which confirms the possibility of creating metal alloys with a desired set of structural properties.