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This article describes the kinetic of intermetallic phases growth during annealing of Al alloy – Ni composite material. The composite was prepared by spark plasma sintering processing (SPS) from gas atomized AlCr6Fe2Si1 with 5 wt. % of Ni. The composite material is stable at temperatures up to 400 °C and no formation of intermetallic phases was observed even after 100 h of annealing. At higher temperatures, the intermetallic phases are formed and the time of the first observation of the intermetallics is strongly dependent on temperature. The only intermetallic phase that was proven by the XRD was the NiAl3. The content of other intermetallic phases, that were clearly visible on the SEM micrographs, was probably lower than the detection limit of the XRD. The forming layers of intermetallics served not as a protective barrier and the reactions continued until the whole amount of Ni reacted, as was established by observation of the sample annealed for 100 h at 550 °C.

Kinetic of the Intermetallic Phases Growing in the Al Alloy - Ni Composite