The Research On The Interface Action Of Different-expansion-pressure Diffusion Bonding Of Ti-6Al-4V And ZQSn10-10

New materials and dissimilar materials are the products of the development of modern high-tech. The joining technology of them is foreland and research hot in the materials joining field nowadays. To research and develop the bonding technology of titanium alloys and other materials is an effective way to exert the fine qualities and extend the application of titanium alloys. But certain difficulties are encountered when titanium and copper alloys are bonded because of different physical and chemical properties, especially bonding sleeve structures such as complex precise friction pairs. And it is not successful until now. In this paper, the bonded joint interface action and forming mechanism of different-expansion-pressure diffusion bonding of Ti-6Al-4V and ZQSn10-10 with and without metal interlayer was systemically carried out. Especially, the pullulation of the reaction layer was analyzed through the study of the dynamics of interface elements diffusion and reaction layer growth. This offers dependable gist in theory to control the growth of the reaction layer and to improve the capabilities of the bonded joint when diffusion bonding dissimilar materials.The interface action of the direct diffusion bonding joint of Ti-6Al-4V/ZQSn10-10 with the optimum technical condition was studied in this paper. The results indicate that Cu and Ti form Ti(ss.Cu) firstly and then Cu3Ti and CuSn3Ti5 form on the interface. A lot ofβ-Ti in the structure transmute intoα-Ti when the base metal Ti-6Al-4V from high temperature to low temperature. The fractures occur in the zone of compound mixtures of Cu3Ti and CuSn3Ti5. Analysis shows that CuSn3Ti5 and Pb particles are the fundamental reason to lead to fracture of the joints. The shear strength of the joint is advanced gradually with the increasing intermetallic compound thickness when the thickness is less than 6μm . It reaches the peak value of 55.9Mpa. On the contrary, when the intermetallic compound thickness is more than 6μm , the shear strength is decreased along with the increasing thickness.The different-expansion-pressure diffusion bonding with Ni interlayer was carried out. Three layers ofα-Ti,Ni3Ti and NiTi appear on the interface between Ti-6Al-4V and Ni interlayer. The intermetallic compound Ni3Ti is formed at first because of G(Ni3Ti)