Microstructural Origins of Dynamic Fracture in 2024 Aluminum Alloy.

摘要

The microstructural aspects of void formation leading to the initiation of spallation have been examined for a commercial aluminum alloy. Metallographic examination of specimens subjected to stress-wave loading conditions has shown that brittle second-phase particles constitute nucleation sites for voids under dynamic loading conditions. The probability of void formation depends on the number of dispersed particles. The ability of the matrix to hinder void growth is affected by solution treatment and is a factor determining dynamic fracture strength. (Author)