Abstract
Grain boundary (GB) migration controls many forms of microstructural evolution in polycrystalline materials. Recent theory, simulations, and experiments demonstrate that GB migration is controlled by the motion of discrete line defects or disconnections. We present a continuum equation of motion for grain boundary derived from the underlying discrete disconnection mechanism. We also present an equation of motion for the junctions where multiple grain boundaries meet - as is always the case in a polycrystal. The resulting equation of motion naturally exhibits junction drag - a widely observed phenomena in junction dynamics in solids and liquids.
| Original language | English |
|---|---|
| Article number | 246101 |
| Journal | Physical Review Letters |
| Volume | 119 |
| Issue number | 24 |
| Online published | 12 Dec 2017 |
| DOIs | |
| Publication status | Published - 15 Dec 2017 |
| Externally published | Yes |
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 10 Reduced Inequalities
Research Keywords
- Disclinations & dislocations
- grain boundaries
- Line defects
- ROUGHNESS
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