Paper number 767


Y.W.Xun, M.J. Tan

School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798

Summary The interface structures and bond properties of steel/Al-20Sn-1Cu system was studied by solid-liquid pressure bonding for commercial fabrication of laminated composites in industry. The effects of processing parameters on bond properties were investigated based on various bonding procedures and shear strength tests. The results showed that the optimum preheating temperature of the liquid alloy is 790C and that an applied pressure can increase the bonding efficiency greatly. The intermetallic layers have been found to form in the temperature range of 730C to 820C. Intermetallic compounds Fe2Al5 and FeAl3 were identified in these layers. Another factor degrading bond properties is the segregation of tin at the interfaces. The addition of rare-earth elements to the liquid alloys can improve the uniformity of aluminum alloy and resist the intermetallic compound development as well as the diffusion process.
Keywords laminate, diffusion, pressure bonding, two-phase processing, aluminum alloy/steel couple, interface property, intermetallic compound, processing parameter.

Theme : Joints

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