Introduction to Fractography
Most of the structural alloys fail by a mechanism known as microvoid coalescence when fractured under continually increasing loads. Microvoids nucleate at the interfaces between matrix and inclusions, second-phase particles, grain boundaries, or imperfections such as microcracks and microporosity. As the load increases, microvoids grow and coalesce and eventually fracture. This mode of fracture is called dimple rupture.