|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Atom Probe Tomography for Advanced Characterization of Metals, Minerals and Materials
||Non-diffusive Drag Effect in APT of AlCu Alloy
||Travis P Withrow, Christian Oberdorfer, Emmanuelle Marquis, Wolfgang Windl
|On-Site Speaker (Planned)
The establishment of atom probe tomography (APT) as the premier three-dimensional (3D) imaging technique in materials science makes it more important than ever before to accurately identify possible artifacts in obtained 3D reconstructions. Such artefacts originate from the complex physics of field evaporation and are inevitably part of each measured dataset. Experimental detector hit maps of differently oriented Al98Cu2 samples show clear enrichment of Cu about the (111) poles and along the  zone lines. By means of sophisticated numerical simulations of APT combining electrostatics and molecular dynamics (MD) we are able to determine the origin of this finding: The out-of-order evaporation of Al next to retained Cu at the (111) terrace edges leads to the formation of unstable surface configurations that, when the emitter structure mechanically relaxes, result in the net movement of Cu towards the observed (111) poles and along  zone lines.
||Planned: Supplemental Proceedings volume