Study on theFracture Behavior of SiCp/LD10 Compositesby Means of In-situ SEM

With tensile loadingunder SEM, the nucleation, p ropagation of cracks to fracture of SiC_p/LD10composites were observed dynamically. It was di scovered that cracks nucleated mainly atthe interface of SiC_p/LD10, fractured p articles and original defects. Thewhole process of crack formation was that mic ro-cracks nucleated, propagated and linkedeach other in the stress concentrati on zone of the tip of the main crack, then combinedin the perpendicular direction of main stress to from a macro-cr ack.