One of the important stages in the preparation of powder bodies from dispersed materials is the sintering process. This process becomes more complex and requires new special research for each specific case. Especially, if the sintering process is accompanied by liquid-phase events, then the subsequent compression kinetics become more complex. Our research has shown that there is a great need to investigate the processes that occur during the liquid-phase sintering of powder bodies in the Al-Cu system. In this case, not only compression and growth can occur in the composite material, but also complex processes such as mutual diffusion and the formation of new phases, strengthening or weakening of the material. Therefore, we have conducted scientific research on the liquid-phase sintering process of Cu-Al system powder composite materials, and investigated the mechanisms of subsequent growth and compression processes. In addition, we have studied the effect of the mass fraction of copper in the sintering mixture on the deformation that occurs during the liquid-phase sintering. For this purpose, we have prepared pressed billets with mass fractions of 1–6% copper at various temperatures (560–640 ℃) and studied the deformation processes that occur during this time. Based on the obtained results, we have constructed the corresponding dependency diagrams.