###### Abstract  
The paper investigates the rheological behavior and microstructuring of an AIMg6/10% SiC metal matrix composite (MMC). The rheological behavior and microstructuring of the AIMg6/10% SiC composite is studied for strain rates ranging between 0.1 and 4 s\({}^{-1}\) and temperatures ranging from 300 to 500 \({}^{\circ}\)C. The microstructure formation is studied using EBSD analysis, as well as finite element simulation and neural network models. The paper proposes a new method of adding data to a training sample, which allows neural networks to correctly predict the behavior of microstructure parameters, such as the average grain diameter, and the fraction and density of low-angle boundaries with scanty initial experimental data. The use of neural networks has made it possible to relate the thermomechanical parameters of deformation to the microstructure parameters formed under these conditions. These dependences allow us to establish that, at strain rates ranging from 0.1 to 4 s\({}^{-1}\) and temperatures between 300 to 500 \({}^{\circ}\)C, the main softening processes in the AIMg6/10% SiC MMC are dynamic recovery and continuous dynamic recrystallization accompanied, under certain strain and strain rate conditions at 300 and 350 \({}^{\circ}\)C, by geometric recrystallization. metal matrix composite; high temperature; aluminum; simulation; rheology; neural network; relaxation; rheological behavior; flow stress; Al-Mg alloy; Al-Mg-Sc-Zr alloy +
Footnote †: journal: Applied Sciences  
with Sc in an amount of up to 0.3% and modified with Mn and Zr [11; 12; 13; 14]. However, despite the low content of scandium due to its high cost, the use of Al-Mg-Sc alloys is also limited. Another way to obtain increased material properties, which has recently gained increasing attention from the industry and researchers, is the creation of metal matrix composites based on an aluminum alloy matrix reinforced with various fillers in various percentages [15; 16; 17; 18; 19; 20]. The development of a new material consists not only in synthesis but also in the need to form the required properties after its manufacture. The required properties of alloys and alloy-based composites, as well as products made of them, are formed using heat treatment and machining in a wide temperature range. In particular, for structural materials, these types of processing make it possible to obtain materials and products with compromised plastic and strength properties. Thus, it becomes possible to control the properties using controlled thermomechanical action consisting of mechanical action on the workpiece under certain temperature conditions [21; 22; 23]. As a rule, the thermomechanical processing of alloys and alloy-based composites is carried out at elevated temperatures, at which the alloy structure is actively rearranged. During plastic deformation, these materials undergo competing processes associated with hardening due to the increased dislocation density and phase transformations, as well as with softening due to dynamic recrystallization, recovery, and increased damage [24; 25; 26; 27; 28; 29; 30; 31; 32]. The interaction of hardening and softening affects the rheological behavior of the material. In particular, the flow stress curves at certain temperatures and strain rates may have a peak [26; 33; 34; 35], a steady-state portion [25; 26; 27; 34; 35], and several hardening and softening sections [10; 11; 36]; in addition, there may be an inverse strain rate dependence [37; 38; 39], when an increase in strain rate causes a decrease in flow stress. To determine the conditions for the formation of the required shape of the workpiece from a material with the necessary properties, one is to relate the thermomechanical parameters of deformation to flow stress and the microstructure parameters.