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Abstract. The Ni-Al multilayer composite was fabricated using explosive welding. The zones of mixing of Ni and Al are observed at the composite interfaces after the welding. The composition of these zones is inhomogeneous. Continuous homogeneous intermetallic layers are formed at the interface after heat treatment at 620 °C during 5 h. These intermetallic layers consist of NiAl 3 and Ni 2 Al 3 phases. The presence of mixed zones significantly accelerates the growth rate of intermetallic phases at the initial stages of heating.