An inverse Hall-Petch effect has been observed for nanocrystalline materials by a large number of researchers. This effect implies that nanocrystalline materials get softer as grain size is reduced below a critical value. Postulated explanations for this behavior include dislocation-based models, di
Inverse Hall–Petch effect and grain boundary sliding controlled flow in nanocrystalline materials
✍ Scribed by K.A. Padmanabhan; G.P. Dinda; H. Hahn; H. Gleiter
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 201 KB
- Volume
- 452-453
- Category
- Article
- ISSN
- 0921-5093
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✦ Synopsis
A simplified procedure for an order of magnitude experimental validation of a recently proposed model for the strain-rate dependent deformation of nanostructured materials is given. The grain size dependence of hardness predicted by the model in the range where the inverse Hall-Petch effect is observed is validated using reliable experimental results. The significance of some related observations is also discussed.
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Based on the principal of virtual work, we derive an equation that describes the balance between volume and interface stresses in a particulate two-phase nanocomposite belonging to the class of random heterogeneous materials. Extracting absolute values of interface stress requires precise measuremen