Abstract
The microstructure and composition of the interface of nickel-to-copper, copper-to-steel, and tantalum-to-steel explosion welds which had been subjected to heat treatments between 500° and 1100°C was investigated by electron microscopy and electron probe microanalysis. The results confirmed that explosive welding establishes continuous and practically diffusionless metallurgical bonds. Diffusion induced by heat treatment causes characteristic microstructural changes along the bond zone which depend on the type of binary phase diagram to which the specimen belongs. The diffusion penetration in nickel explosively welded to copper is noticeably more extensive than in the similar electroplated couple. In all three metal pairs the diffusion rate varies cyclically along the weld interface. These latter effects appear to be related to the unique concentration and distribution of lattice defects characterizing explosively bonded metals.
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Trueb, L.F. Microstructural effects of heat treatment on the bond interface of explosively welded metals. Metall Trans 2, 145–153 (1971). https://doi.org/10.1007/BF02662650
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DOI: https://doi.org/10.1007/BF02662650