## 2 Materials and Methods  
### Material and Research Technique  
The AlMg6/10% SiC metal matrix composite (MMC) [60] produced using powder technology is used as the material for the study. The initial components of the AlMg6/10% SiC MMC were mixed in a vibratory mixer in an argon atmosphere. Sintering was carried out for 60 min at a temperature of 420 \({}^{\circ}\)C. The pressure at which sintering occurred was 30 MPa. No additives modifying the surface of SiC particles were used. The size of the SiC particles corresponds to the F1500 standard, with an average diameter of 2.0 \(\pm\) 0.4 \(\upmu\)m. Figure 1 shows an EBSD image and SEM image of the composite before deformation. As can be seen from this figure, the matrix particles are a polycrystalline material. After sintering of the composite, the SiC reinforcer particles are located along the boundaries of the matrix particles. In this paper, the composite was studied without pre-extrusion. Its mechanical properties at room temperature are shown in Table 1. For comparison, this table shows the properties of AlMg6 and Al-Mg-Sc-Zr alloys, which are similar in use to the composite. Before testing, all the materials were identically annealed for 15 h at 520 \({}^{\circ}\)C. It can be seen from this table that the yield strength and elastic modulus of the composite are higher than those of the AlMg6 alloy and its more expensive Al-Mg-Sc-Zr analog. Table 2 shows the chemical composition of the Al-Mg-Sc-Zr alloy, the AlMg6 alloy, and the matrix of the AlMg6/10% SiC metal matrix composite. The chemical compositions were determined by means of a Spectromaxx LMF04 optical emission spectrometer, and the granulometric composition of the powders was determined by laser diffraction using a LaSca-TD. The densities of the materials were determined using the hydrostatic method according to ASTM B311-13, by weighing the specimens in air and distilled water on an Ohaus Pioneer PA 214 analytical balance. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline
**Material** & **Al** & **Mg** & **Mn** & **Sc** & **Fe** & **Zr** & **Si** & **Cu** & **Ti** & **Zn** & **Be** \\ \hline AlMg6 alloy & & & & & & & & & & & \\ and the matrix of & balance & 6.56 & 0.5 & - & 0.27 & - & 0.16 & 0.013 & 0.04 & 0.02 & 0.0012 \\ AlMg6/10\% SiC & & & & & & & & & & \\ Al-Mg-Sc-Zr alloy & balance & 5.18 & 0.36 & 0.23 & 0.12 & 0.07 & 0.01 & 0.022 & 0.02 & 0.003 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Chemical composition of materials, wt%. Figure 1: **(a)** The EBSD image after electropolishing and **(b)** the SEM image of the AlMg6/10% SiC MMC microstructure. Experiments on the determination of the mechanical properties and rheological behavior of the composite at room and high temperatures were performed for cylindrical specimens. Compression specimens had a diameter \(d_{0}\) of 6 \(\pm\) 0.05 mm and a height \(h_{0}\) of 9 \(\pm\) 0.05 mm. Cylindrical tensile specimens had the following dimensions: \(d_{0}\) = 5 \(\pm\) 0.05 mm, and the length of the gauge part \(l_{0}\) = 25 \(\pm\) 0.1 mm. The data obtained from high-temperature compression tests of specimens were used to construct flow stress curves depending on temperature, strain, and strain rate. These curves were used for finite element simulation of specimen compression. Compression experiments were carried out using an automated plastometric installation designed at the Institute of Engineering Science, UB RAS [11; 39]. In compression experiments, a graphite-containing lubricant was used to reduce friction between the punch and specimen. The lubricant provided the coefficient of Coulomb friction between the flat die and aluminum alloy equal to 0.09 at 300 \({}^{\circ}\)C and equal to 0.1 and 0.13 at 400 and 500 \({}^{\circ}\)C, respectively.