|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Ultrafine-grained Materials X
||Increased Defect Densities in SPD-processed Hydrogenated Palladium and their Impact to the Macroscopic Strength
||Wolfgang Ress, Erhard Schafler, Wolfgang Sprengel, Yuzeng Chen, Reiner Kirchheim, Michael Josef Zehetbauer, Daria Setman
|On-Site Speaker (Planned)
Recently, Krystian et al. (Scr.Mater.62, 49 (2010)) showed that in hydrogenated SPD (Severe Plastic Deformation)-processed palladium the densities of lattice defects were significantly higher than in non-hydrogenated ones which can lead to marked increases of strength. Chen et al. (Scr.Mater.68, 743 (2013)) concluded that all the strength increase arises from the increase in dislocation density due to the presence of hydrogen, but this investigation was done for small plastic deformations only. The present talk reports a systematic analysis of the extra strength over the whole deformation range, by means of isochronal microhardness measurements and by various defect-specific measuring methods, in order to separate the specific strength contributions by selective thermal annealing of SPD induced defects. It was found that the major part of hardening arises from the vacancy type defects, and only a smaller one from the dislocations and grain boundaries.
||Planned: Supplemental Proceedings volume