Progress in understanding the processes of structure formation occurring in melts of the Al-TM-REM type (TM-transition metal, REM-rare earth metal) in the field of eutectics, as well as in studying the influence of extreme effects (high pressures, temperatures and cooling rates) on their processes hardening has a high scientific significance and relevance.

The main types of high pressure chambers used in Russia and abroad are considered.

The structure and properties of aluminum-based alloys of binary Al-TM systems, as well as binary and multicomponent glass-forming Al-REM, Al-TM-REM alloys and high-entropy AlNiCoFeCr alloys are studied during the rapid solidification of their high-temperature melts in a toroid-type high-pressure chamber. The possibility of forming а new phases in alloys is investigated. The temperature range is from liquidus temperature to 2000 K. The pressure range is from atmospheric to 10 GPa. Scheme of the experiment: setting the pressure → pulsed heating → holding at the set pressure and temperature →

 rapid cooling without depressurizing to room temperature → reducing the high pressure to atmospheric. The cooling rate is 1000 deg/s.

At pressures above 7 GPa and temperatures of the order of 1800 K, new metastable compounds are formed in the alloys, which persist for a long time under normal conditions. Depending on the production mode, the mechanisms of melt

solidification change, and abnormally supersaturated solid solutions are formed in the alloys. The samples are homogeneous, dense, no pores and shrinkage cavities were found. The structure is finely dispersed with high mechanical properties. High pressure increases the glass-forming ability of the alloys.

Keywords: Al-based alloys, High pressure, Metastable phase, Thermobaric treatment, Microstructure