|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||Achieving Enhanced Room Temperature Ductility in Bulk Nanostructured Mg
||Xin Wang, Lin Jiang, Dalong Zhang, Enrique J. Lavernia, Julie M. Schoenung
|On-Site Speaker (Planned)
Insufficient ductility is a major obstacle to the increased application of Mg as a lightweight structural material. In the present study, bulk nanostructured Mg was fabricated by means of powder metallurgy via cryogenic ball milling and subsequent consolidation by spark plasma sintering (SPS). As-sintered samples were compression tested at room temperature at a strain rate of 10-3 s-1. A large strain of over 100% and a yield strength of ~160 MPa were achieved. Mechanisms responsible for the exceptional ductility were further investigated by exploring the microstructure and microtexture of these samples. TEM observations revealed a bimodal grain size distribution consisting of submicron sized coarse grains distributed in a nanocrystalline matrix with an average grain size of ~70 nm. Microtexture analysis by transmission Kikuchi diffraction indicated randomized orientations of the nanograins. Our results suggest effective grain refinement and texture randomization are important for enhanced ductility in Mg.
||Planned: Supplemental Proceedings volume