| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
A Model for Grain Boundary Strengthening |
| Author(s) |
Roberto B. Figueiredo |
| On-Site Speaker (Planned) |
Roberto B. Figueiredo |
| Abstract Scope |
Grain boundaries play a major role on the strength of metallic materials. A linear relationship between the flow stress and the inverse of the square-root of the grain size was identified over 70 years ago but the phenomenology behind this effect remains under discussion. A model was suggested in 2021 to explain the steady-state deformation mechanism of ultrafine and nanocrystalline materials and the yield stress of coarse grained materials. The present work discusses this model and show it can predict the relationship between the flow stress and the grain size for over 30 different metals without the aid of any adjusting variable. Moreover, the model also predicts the thermal contribution to the flow stress and the evolution of the strain rate sensitivity as a function of the material grain size and testing conditions. A large amount of data from the literature is used to support the model. |