Evolution of the Structure of Local Regions of Fused Metal in Explosion-Welded Nickel-Aluminum Composites Under Heat Treatment

Abstract

The methods of electron, optical, and atomic force microscopy are used to study the structure, morphology and phase composition of local regions of fused metal in an explosion-welded nickel-aluminum composite. It is shown that the diffusion zone formed due to the heat treatment repeats the contour of the fuse in the first stage and then “absorbs” it upon duration of the hold thus leveling the phase composition. ANi₂Al₃ Aluminide layer forms on the side of nickel and a NiAl₃ layer forms on the side of aluminum.