|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Refractory Metals 2016
||Stress Accommodation in Plastic Zone Ahead Crack Tip in Iridium
||Peter Panfilov, Mikhail Yu Gutkin, Elijah N Borodin, Elena A Lyapunova
|On-Site Speaker (Planned)
Iridium is the sole refractory FCC-metal (Tmelt=2443C), which cleaves after considerable plastic deformation, and, hence, it may be chosen as the model material for examination of competition between brittle fracture and plastic response in metals. The problem of cleavage crack stability under tension in iridium single crystals is considered in dependence on the length of crack and its angle of opening, the size of plastic zone ahead crack tip and active slip systems here. It was shown that there are two stages of crack evolution in iridium, which are repeated. The first one, materials near power stress concentrator leaves its plasticity during preliminary plastic deformation. The second one, brittle crack advances inside this area. This research is supported by the Russian Science Foundation (#15-19-10007).
||Planned: A print-only volume