Journal
MATERIALS TRANSACTIONS
Volume 55, Issue 1, Pages 19-24Publisher
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.MA201310
Keywords
Hall-Petch relationship; yield stress; dislocation; grain boundary; strength; ultrafine-grained metal; strain rate; temperature; thermal activation
Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [22102006]
- Grants-in-Aid for Scientific Research [22102006] Funding Source: KAKEN
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Models and theories to explain the Hall-Petch relationship are reviewed briefly. Then, a dislocation model to incorporate some characteristic mechanical properties of ultrafme-grained and nanocrystalline metals will be introduced and used to explain some experimental results. The model is based on the idea that dislocations emitted from grain boundaries and bow out into grain interiors during their propagation are responsible for plastic deformation and thermally-activated depinning process at grain boundaries is regarded to be rate controlling. Some implications of the model are discussed in the light of recent experimental results.
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