About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-Grained and Heterostructured Materials (UFGH) XIV
|
| Presentation Title |
Effects of SPD induced Vacancies Revisited: From Micro- To Nanocrystalline Materials |
| Author(s) |
Michael Josef Zehetbauer |
| On-Site Speaker (Planned) |
Michael Josef Zehetbauer |
| Abstract Scope |
Since the introduction of methods of Severe Plastic Deformation (SPD), non-equilibrium vacancies induced by plastic straining have gained much importance: Because of both the large plastic strains as well as the extended hydrostatic pressures applied in SPD processing, the vacancy concentrations can reach values till 10^-2. On the one hand, those can strongly enhance the diffusion in SPD processed alloys thus achieving significant changes in the stability of phases; on the other hand, the vacancies can form agglomerates, or trigger climb of grain boundary edge dislocations, thus causing extra hardening by up to several tens of %. Also in maximizing functional properties of SPD-processed materials, those mechanisms become relevant, e.g for highly sustainable hydrogen storage in case of microcrystalline hydrides, and maximum figure of merits in case of nanocrystalline thermoelectrics. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Energy Conversion and Storage, Modeling and Simulation |