Abstract
Static tensile properties were examined on the sandwich type composite plates composed of steel-copper and iron-copper which were fabricated by means of diffusion bonding method. It was observed that the tensile strength of the composites agreed with the rule of mixture as a first approximation. The yield point of the copper clad iron was higher than the expected value which was obtained from an elementary theory combined with the rule of mixture. The fracture elongations of the copper clad iron and steel were increased comparing with those of the monolithic iron and steel due to multiple neckings which were observed on the parallel parts of the clad specimens.