About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
|
Presentation Title |
The Heterogeneous Nature of Mechanically Accelerated Grain Growth |
Author(s) |
Elton Chen, Brad L Boyce, Remi Dingreville |
On-Site Speaker (Planned) |
Remi Dingreville |
Abstract Scope |
Atomistic simulations are used to study the process of heterogeneous thermal-mechanical grain growth in Pt nanowire. Systems are thermally relaxed at the temperature of 400K and 600K in combination with tension and equivalent shear fatigues of 0.6%, 0.8% and 1.0% across 50 cycles over 5ns. In order to extract general grain growth trends, analysis is performed for the top 10 largest grains. At 400K both mechanical fatigue modes accelerate grain growth, however the effects are heterogeneous to each grain. At 600K, tension fatigue disproportionally affects a different set of grains, while shear fatigue consistently de-accelerates grain growth in a few grains. No direct correlation can be observed between relative grain growth rate and grain size; largest grain is not always the fastest growing nor especially benefit from mechanical acceleration. Only abnormal grain growth mechanism observed is the abrupt rotation of smaller neighboring grain of similar orientation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Mechanical Properties, Computational Materials Science & Engineering |