|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Thermal and Mechanical Stability of Nanocrystalline Materials
||Atom Probe Tomography Investigation of Diamantane Induced Stability in Nanocrystalline Aluminum
||Torben Boll, Martin Heilmaier, Ali Yousefiani, James Earthman
|On-Site Speaker (Planned)
Independent studies have reported that additions of diamantane, C14H20, confers remarkable thermal stability to nanocrystalline Al and Mg. This stability has made it possible to achieve exceptional mechanical properties with bulk nanocrystalline products. One of the difficulties in understanding how the presence of diamantane results in this stability is determining the location of the diamantane with respect to grain boundaries. Fortunately, atom probe tomography (APT) methods are well suited for investigating nanoscale grain stability. In the present work, we used APT to study four different samples of cryomilled Al that were prepared with no additions, diamantane, Mg, and diamantane + Mg. It was found that Ga stemming from focused ion beam preparation could be used to identify grain boundaries so that the relative locations of diamantane and Mg could be determined. It was also possible to use spatial distribution maps and atom vicinity to indirectly identify a grain boundary.
||Planned: Supplemental Proceedings volume