Abstract
Understanding the fracture mechanism from the source will provide a decisive insight into the fusion welding of new high strength lightweight SiCp/Al composite. In this work, the fracture characteristics and the correlative damage mechanisms near fracture crack tip in a notorious SiCp/2A14Al joint was conducted by FIB, TEM and EBSD. The results showed that the weld fusion region of Ti-SiCp/2A14A joint was composed of fine equiaxed crystal region of about 5 um and SiC accumulation region. After 0.25% tensile strain, the two regions with different grain morphology have different degrees of geometric dislocation density evolution. Due to the aggregation behavior of SiC, the dislocation density in the elastic deformation stage was higher than that in the equiaxed crystal region. This is a new insight of fracture research of high strength SiCp/Al composites.
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