| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium: Thermodynamics, Phase Equilibria and Kinetics for Materials Design and Engineering
|
| Presentation Title |
Phase Equilibria and Interfacial Migration in Stressed Solids |
| Author(s) |
Nicholas J Weadock, Peter W. Voorhees, Brent Fultz |
| On-Site Speaker (Planned) |
Peter W. Voorhees |
| Abstract Scope |
A possible route to storing hydrogen for hydrogen-based energy systems is via hydride formation. One challenge of using metal hydrides to store hydrogen is an efficiency loss due to hysteresis: the absorption and desorption of hydrogen does not occur at the same hydrogen gas pressure. We examine phase formation and phase equilibria in the hydrogen-palladium system where a significant difference in lattice parameters between the hydride and matrix phases generates stress in the system. The stress is thought to lead to a coherent phase equilibrium state that induces the hysteresis. However, experiment shows that the hysteresis is present even in a partially transformed system, indicating that a stress-induced jump in volume fraction of hydride is not responsible for the hysteresis. An explanation for the hysteresis that is based upon the driving force for interface migration in a stressed solid will be presented. |
| Proceedings Inclusion? |
Undecided |