Fracture mechanisms of a 2124 aluminum

摘要: This study was aimed at investigating the effects of microstructure on fracture behavior a 2124 aluminum composite reinforced with SiC whiskers. Particular emphasis placed role matrix intermetallic particles, inhomogeneous distribution whiskers, and whisker breakage in process. Various tests were conducted to identify micromechanical processes that involved microvoid or microcrack formation. Detailed microstructural analyses showed contained significant amount coarse manganese-containing particles various sizes which could have been formed during processing.In situ scanning electron microscope (SEM) crack initiation propagation clearly these fractured prior matrix/whisker decohesion breakage, suggesting par- ticles significantly accelerated Al-SiCw composite. For better ma- trix alloy for use composite, it is suggested microalloying elements must be monitored prevent formation particles.