Abstract
Titanium (Ti) and its alloys are attractive for a wide variety of structural and functional applications owing to excellent specific strength, toughness and stiffness, and corrosion resistance. However, if exposed to hydrogen sources, these alloys are susceptible to hydride formation in the form of TiHx (0 < x ≤ 2), leading to crack initiation and mechanical failure due to lattice deformation and stress accumulation. The kinetics of the hydriding process depends on several factors, including the critical saturation threshold for hydrogen within Ti, the specific interaction of hydrogen with protective surface oxide, the rates of mass transport, and the kinetics of nucleation and phase transformation. Unfortunately, key knowledge gaps and challenges remain regarding the details of these coupled processes, which take place across vast ranges of time and length scales and are often difficult to probe directly. This work reviews recent advances in multiscale characterization and modeling efforts in Ti hydriding. We identify unanswered questions and key challenges, propose new perspectives on how to solve these remaining issues, and close knowledge gaps by discussing and demonstrating specific opportunities for integrating advanced characterization and multiscale modeling to elucidate chemistry and composition, microstructure phenomena, and macroscale performance and testing.
| Original language | English |
|---|---|
| Article number | 101020 |
| Journal | Current Opinion in Solid State and Materials Science |
| Volume | 26 |
| Issue number | 6 |
| DOIs | |
| State | Published - Dec 2022 |
| Externally published | Yes |
Funding
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. This work was funded by the Laboratory Directed Research and Development (LDRD) program (20-SI-04) at Lawrence Livermore National Laboratory. BCW and TWH acknowledge additional funding from the Hydrogen Materials—Advanced Research Consortium, provided by the U.S. Department of Energy Hydrogen and Fuel Cell Technologies Office, Office of Energy Efficiency and Renewable Energy, under Contract DE-AC52-07NA27344.