|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Dynamic Behavior and Microstructural Evolution of Nanocrystalline and Ultrafine Grained Cu-Ta Alloys
||S Turnage, M. Rajagopalan, K Darling, Kiran N Solanki
|On-Site Speaker (Planned)
||Kiran N Solanki
This investigation analyzes the compressive high strain rate (10^3 to 10^4 1/s) mechanical behavior of nanocrystalline and ultrafine grained Cu-Ta alloys processed through ball milling followed by equal channel angular extrusion. High strain rate behavior is measured with a split Hopkinson pressure bar at temperatures ranging from 25 ˚C to 800 ˚C. For comparison, quasistatic tests (10^-3 1/s) are also reported for the same range of temperatures. Advanced characterizations such as aberration corrected transmission electron microscopy (TEM) is performed to analyze the microstructure of the samples before and after testing which reveals that the presence of Ta clusters aid in superior grain stabilization and provide further strengthening. Further, microstructure and mechanical behavior data reveal that twin and grain growth as a result of increased temperature cause phonon drag to play a more significant role at lower strain rates.