|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Substantially Reduced Elastic Modulus in Nanocrystalline Tantalum Processed by High Pressure Torsion
||Jonnathan Paul Ligda, Brian E. Schuster, Laszlo J. Kecskes, Qiuming Wei
|On-Site Speaker (Planned)
The vast majority of research efforts on ultrafine grained (ufg, grain size between 100 nm and 1000 nm) and nanocrystalline (nc, grain size smaller than 100 nm) metals and alloys have been focused on the strength and ductility of such materials processed via various techniques, including bottom-up and top-down techniques. Among the technical routes used to produce ufg/nc metals, severe plastic deformation (SPD) and its different variants have become popular since they can produce fully dense and bulk materials. It has been generally observed that ufg/nc metals produced via SPD can exhibit a good combination of strength and ductility. In this work, we report for the first time that nc Ta processed by high pressure torsion (HPT) at room temperature shows substantially reduced elastic modulus compared with its coarse-grained counterpart. This observation is confirmed with nanoindentation, micro-tension and diamond anvil cell experiments.