|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Deformation Behavior of Ultrafine Grained Tungsten from Powder Metallurgy Processes
||Brady G. Butler, Tomoko Sano, Jonathan Ligda
|On-Site Speaker (Planned)
||Brady G. Butler
Microstructure refinement has long been a tool to improve the mechanical properties of various alloy systems. In practice, the Hall-Petch relationship has been used for over half a century to describe the relationship between grain size and yield strength. In recent years, novel processing developments have allowed us to study the limits of this empirical relation and develop new models for describing mechanical behavior at the nanoscale. While the fundamental limits of this behavior are material specific, the shift from ideal Hall-Petch behavior has been shown to describe a fundamental shift in deformation mechanisms. The goal of this research is to identify and analyze these grain size dependent mechanisms for deformation in tungsten alloys and discuss their implications for future engineering materials. In addition to yield strength, we will analyze slip systems, strain hardening behavior and strain rate sensitivity to determine the impetus for changing modes of plasticity.