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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Mechanical Behavior of Nanostructured Materials
Presentation Title Study of Dynamic Recovery in Nanocrystalline Metals Using In-situ X-ray Diffraction and MD Simulations
Author(s) zhen Sun, Steven Van Petegem, Christian Brandl, Maxime Dupraz, Karsten Durst, Wolfgang Blum
On-Site Speaker (Planned) Steven Van Petegem
Abstract Scope Transient testing has proven to be a suitable tool to gather information on rate limiting deformation mechanisms. In this work, we combine stress reduction tests with in situ synchrotron x-ray powder diffraction and apply this for electrode posited nanocrystallline Ni. The transient response is captured in terms of the evolution of the macroscopic strain rate and diffraction peak broadening. It is shown that the constant flow stress reached during uniaxial deformation reflects a quasi-stationary balance between dislocation slip and recovery mechanisms.at grain boundaries. In order to to gain further knowledge on this interplay molecular dynamics simulations (MD) have been performed. Virtual stress reduction followed by a creep period have been simulated for various magnitudes of stress drops. These simulations confirm the interpretation of the behavior of the peak broadening during in situ diffraction experiments: after a stress drop strain is predominantly produced by grain boundary accommodation mechanisms.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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