Abstract
The tensile behavior of unidirectionally reinforced boron fila ment-aluminum composites was evaluated for a wide range of diffusion bonding parameters and a method of detailed analysis of the stress-strain behavior developed and described. The effect of these variations in processing conditions on the tensile behavior, including the fracture morphology of the resulting composites, was assessed. The value of the composite tensile strength at the opti mum combinations of time and temperature in the experimental situation was from 120 to 130 percent of the calculated rule of mixtures value. This demonstrated synergism is discussed and explained in terms of the developed internal multiaxial stress states in the composites.
The bond between the aluminum and the boron filament was investigated by electron microscope replica techniques. The replicas demonstrated that a strong bond between the filament and the metal matrix exists by showing failure in the metal rather than the bond area upon filament extraction.
The significance of the various diffusion bonding parameters in terms of the development of the multiaxially produced synergism is discussed in terms of the further development of these tech nologically important aluminum-boron composites.
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