Diffusion welding of aluminium alloy strengthened by Al2O3 particles through an Al/Cu multilayer foil

► We studied deformational behaviour of multilayer foil at heating under load. ► It is shown that such foils undergo superplastic flow at certain temperatures. ► Comparison of conditions welding through foil and its plastic flow was performed. ► Temperatures of welding and superplasticity of foils correlate with each other. ► A mechanism of welded joint formation through multilayer foil is proposed.