About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VI
|
Presentation Title |
Deciphering the Deformation Mechanisms of Nanocrystalline-nanotwinned Metals in Hall-Petch Breakdown Regime |
Author(s) |
Yinmin (Morris) Wang |
On-Site Speaker (Planned) |
Yinmin (Morris) Wang |
Abstract Scope |
Although the mechanisms of Hall-Petch breakdown in nanocrystalline (average grain size <100 nm) materials have been extensively investigated, it remains a challenge to fully decipher the origins of Hall-Petch breakdown in nanotwinned (average twin spacing <100 nm) metals. An interesting question arises when a material has both nanocrystalline grains and nanotwinned structures. This presentation will discuss both experimental and simulation results on a class of nanocrystalline-nanotwinned materials, where new deformation mechanisms could start to emerge at nanoscales. We show that defects in experimental synthesized materials may play a significant role in triggering Hall-Petch breakdown. Molecular dynamics simulations with defective and ideal materials suggest drastically different deformation mechanisms that may help to reconcile some literature controversies. The presentation will further discuss the implications of these defect structures on other physical properties such as electrical conductivity and thermal stability. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Nanotechnology, Characterization |