| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XI)
|
| Presentation Title |
Effect of Interface Type on the Deformation Behavior of Nanostructured Metals |
| Author(s) |
Oliver Renk, Verena Maier-Kiener, Daniel Kiener, Reinhard Pippan |
| On-Site Speaker (Planned) |
Oliver Renk |
| Abstract Scope |
Nanomaterials contain large fractions of interfaces which control mechanical properties and the deformation behavior. We present insights obtained from various nanocrystalline FCC materials by nanoindentation strain rate jump tests, revealing above a critical temperature a remarkable increase of the strain rate sensitivity. Comparing these transition temperatures with those obtained in an in-situ TEM study indicates, that the increased rate sensitivity is caused by a change from mechanically to thermally induced annihilation of lattice dislocations at the boundaries. The effect of this transition on mechanical properties will be evaluated. As for thermally activated dislocation annihilation interfacial diffusivity plays an important role, similar experiments were carried out on alloyed samples but also on samples containing different boundary types (twin, high and low angle boundaries) despite having the same interfacial spacing. These experiments reveal a fundamentally different mechanical behavior with temperature and suggest that strengthening is not solely determined by the boundary spacing. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |