Peculiarities of phase transformations in the Al–Fe–Ga system at temperatures of 800, 1000, and 1200^οC are investigated. The objects of research are samples obtained from mixtures of Al powders and Fe–Ga ligatures of equiatomic composition. The proportion of Al in the mixture is of 90, 70, and 50% by mass. Sintering of the compressed samples is carried out in an Ar environment under a pressure of 0.2 MPa with isothermal holding at the sintering temperature for 1 hour. The structure of the samples is studied depending on the material composition and sintering temperature by x-ray phase analysis and x-ray spectral microanalysis and microdurometry. As established, the base of the structure of all samples is an Al-based solid solution and ternary intermetallic inclusions mainly of the Al_x(Fe,Ga)_(100−x) type (x = 2...3.6). As found, the structure of the material with 90% mass. Al changes little with temperature. Phase composition becomes increasingly dependent on the temperature with increasing amounts of Al in the samples. The Al-based solution contains Ga atoms at the level of solubility of this metal in Al on the same level as in binary system Al–Ga (to 8–9% at.); at the same time, very small amount of Fe is detected in the solution. A practically constant ratio of Al atoms to the total number of other two components is found in the composition of intermetallics. In addition, in the structure of samples with 70% and 50% mass. Al, the residual Ga-based phase with a small amount of Al and Fe is observed. The microhardness of the Al-based solution depends slightly on both the composition of material and the sintering temperature and is equal to 0.41...0.45 GPa. Microhardness of intermetallics varies from 1.3...4.3 GPa (800^οС) to 5.3 and 6.3 GPa (1000^οС and 1200^οС, respectively) for samples with a content of 70 and 50% mass. Al. Variations in hardness values are conveniently explained by variable composition of intermetallic inclusions. This indicator is maximal in the material with 90% mass. Al and corresponds to the level of hardness of the intermetallide Al₃Fe.