Joining of aluminium based metal matrix composites

Metal matrix composites (MMCs) are becoming more popular as structural materials, and joining them is, therefore, of paramount importance. As these new materials become available, it is necessary to define and optimise joining techniques, and a thorough understanding of each process is required. A number of joining processes have been addressed, namely: fusion welding (tungsten and metal inert gas welding, electron and laser beam welding, resistance, capacitor discharge, and plasma welding), solid state bonding (diffusion bonding, friction and magnetically impelled arc butt welding), brazing, and adhesive bonding. The advantages and disadvantages of each technique are discussed with respect to weld-parent material microstructure and the mechanical properties of the bond. Recommendations are subsequently made as to the most appropriate method for bonding aluminium based MMCs.