|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Atom Probe Tomography for Advanced Characterization of Metals, Minerals and Materials
||Direct Observation of Hydrogen in Ti Alloys by Atom Probe Tomography
||Yanhong Chang, Baptiste Gault, Andrew Breen, Dirk Ponge, Dierk Raabe
|On-Site Speaker (Planned)
Hydrogen behaviors in materials remain elusive because of the experimental challenges to directly observe them, especially at near-atomic scale. Here, by using atom probe tomography (APT) combined with transmission electron microscopy (TEM) and atom probe crystallography, we imaged hydrogen as solute atoms in bcc β phase, hydrides and segregation in a set of titanium alloys. ~50 at.% hydrogen was detected along grain boundaries and/or interfaces, which was identified as titanium hydride by combining TEM and atom probe crystallography. Higher H solubility in bcc β phase than in α phase was clearly revealed. Residual H level in APT analysis chamber was evaluated by detected H content in hcp α phase which has negligible H solubility. Direct observation of H opens an access for more closely understanding the H behaviors and furthermore hydrogen embrittlement mechanism within materials.
||Planned: Supplemental Proceedings volume