Hydride Formation In Ti6al4v: An In Situ Synchrotron X-Ray Diffraction Study

Hydrogen uptake causes hydride formation, lattice strains and other crystallographic changes in Ti6Al4V. To monitor these changes and understand them better, we developed an in situ hydrogen-charging setup for transmission X-ray diffraction, and employed it at a high-energy synchrotron X-ray source. We observed anisotropic lattice expansion by H ingress, as well as hydride formation induced microstrain evolution in both phases. The hydride phase was also crystallographically characterized, including its orientation relationship with the neighboring phases, employing electron backscattered diffraction analysis. Further applications of the presented methodology to investigate H-microstructure interactions are also discussed. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.