|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Nanocrystalline and Ultra-fine Grain Materials and Bulk Metallic Glasses
||Rate Sensitivity and Deformation Mechanisms of Ultrafine-Grained Single Phase and Composite Metals
||Daniel Kiener, Alexander Leitner, Verena Maier-Kiener
|On-Site Speaker (Planned)
Nanostructured materials and composites are of high interest, as they exhibit outstanding structural properties such as high hardness and good deformability. However, knowledge about their high temperature mechanical properties and the rate-dependent deformation mechanisms governing plasticity at elevated temperatures. Here, we produced nanocrystalline bcc metals (e.g. Cr, Fe), and nanocomposites (e.g. Cu-Fe, Cu-Nb) by severe plastic deformation using high pressure torsion. Subsequently, high temperature nanoindentation strain-rate jump and nanoindentation creep experiments were performed to analyze the strength, strain-rate sensitivity, and activation volume of these nanostructured materials. We discuss the influence of the different interfaces on the related deformation mechanisms of the nanostructured bcc metals and fcc/bcc composites. In fact, the rate dependent deformation behavior of nanostructured bcc materials and composites at elevated temperatures is rationalized by the fact that above the critical temperature they behave fcc-like. Notably, new rate-dependent grain boundary interactions have to be considered.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)