Research of the bonded interface of Cu9Al4Fe/1Cr18Ni9Ti stainless steel bimetallic composite

Cu9Al4Fe/1Cr18Ni9Ti stainless steel bimetallic composite was prepared by the method of vacuum casting. The microstructure morphology, mechanism bonding and mechanical property of Cu9Al4Fe/1Cr18Ni9Ti bimetallic composite were observed by scanning electron microscope, energy disperse spectroscopy, X-ray diffraction, transmission electron microscope and nano-indentation analysis techniques respectively. The research results are as follows: The interface transition layer of Cu9Al4Fe/1Cr18Ni9Ti bimetallic composite maintains straight and a certain thickness and no obvious defects are observed. The phase on the transition zone is consisted of α-Fe based solid solution, γ-Fe based solid solution, NiAl phase and AlCr2 phase. The micro-hardness and elastic modulus of the interface transition layer are higher than the two matrix alloys. The fracture of Cu9Al4Fe/1Cr18Ni9Ti bimetallic composite prefers to occur between 1Cr18Ni9Ti and the interface transition layer, and the fracture mode is cleavage fracture.