OPTIMIZING THE PARAMETERS OF AZ91/SICP REINFORCED COMPOSITE BY ACCUMULATED DIFFUSION BONDING PROCESS
Keywords:
Composites, Accumulative diffusion bonding, shear strength, bonding strengthAbstract
AZ91 Magnesium matrix with 15% weight fractions of SiCp(10µm) reinforced composite were produced through accumulative diffusion bonding (ADB) process. ADB process parameters such as bonding temperature, bonding pressure and holding time of the bond specimen play a major role to determine the bond strength. In this investigation an attempt was made to develop empirical relationships to predict the lap shear strength of diffusion bonding of AZ91/SiCp incorporating above said parameters. Box–Behnken design was applied to optimize the diffusion bonding process parameters to attain the maximum shear strength of the bond. From this investigation, it is found that the bonds fabricated with the bonding temperature of 400◦C, bonding pressure of 10MPa and holding time of 60 min exhibited maximum shear strength of 85 MPa. Shear stress fracture and the interface between the magnesium matrix and SiC was characterized by scanning electron microscopy (SEM) and Energy dispersive spectrum (EDS) analysis. The results show a refined matrix structure of the composite compared to the matrix alloy that no reaction takes place during the synthesis of the magnesium matrix with SiCp reinforced composites.
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