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This video deals with
1. Role of grain boundaries to resist dislocation motion
2. Dislocation pile up at boundaries
3. Model to explain Hall-Petch relation
4. Importance of friction stress and Hall-Petch coefficient
5. Utility of Hall-Petch equation
6. Inverse Hall-Petch relation
7. Critical value of grain size for retaining strength
8. Grain growth in nanograined materials even at ambient conditions