Establishing an Empirical Relationship to Predict the Bonding and Shear Strength of Diffusion Bonded AA7075 Aluminium Alloys

摘要

Rolled plates of 5 mm thick AA7075 aluminum alloys were fabricated by diffusion bonding. Empirical relationships were made to predict the bonding and shear strength of AA7075/AA7075 aluminium alloys integrating diffusion bonding parameters such as bonding temperature, bonding pressure and holding time. Metallurgical characterizations were carried out using optical microscopy and SEM-EDS. It is observed that the bonding and shear strength increased with the increase in bonding temperature and bonding pressure mainly due to the diffusion of atoms in the interface. Furthermore, it is observed from the microstructural characterization, the strength achieved were reliant on the interface grain boundary migration and grain growth during the bonding process respectively. Three factors and a central composite design were used to minimize the number of experimental conditions. Response surface method was used to develop their relationship. The developed relationship can be effectively used to predict the strength of diffusive bonded AA7075 aluminium alloys at 95% confidence level.