Abstract
Particle-reinforced aluminium metal matrix composites were ultrasonically brazed. In situ compositing technology of a particle-reinforced bond is described in this article. The joints with lower strength showed a structure of composite material/bond metal/composite material after ultrasonic brazing. The double liquid–solid zones in the base material close to the bond were fabricated by means of melting the base materials at a relatively higher temperature. Then pressure was applied to the samples, the double liquid–solid zones and the bond were mixed with each other and a particle-reinforced bond formed. The microstructure of the particle-reinforced bond is very similar to that of the base composite materials. The shear strength of the bonds was improved dramatically.
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