Emission of Dislocations from Grain Boundaries and Its Role in Nanomaterials
| Autor: | Bhakta B. Rath, Chen Feng, James C. M. Li |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science General Chemical Engineering grain boundaries 02 engineering and technology dislocation emission 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Engineering physics metals and alloys Nanocrystalline material Nanomaterials Inorganic Chemistry Transmission electron microscopy 0103 physical sciences lcsh:QD901-999 General Materials Science Grain boundary lcsh:Crystallography Crystallite Dislocation Hall-Petch relation 0210 nano-technology nanomaterials |
| Zdroj: | Crystals, Vol 11, Iss 41, p 41 (2021) |
| ISSN: | 2073-4352 |
| DOI: | 10.3390/cryst11010041 |
| Popis: | The Frank-Read model, as a way of generating dislocations in metals and alloys, is widely accepted. In the early 1960s, Li proposed an alternate mechanism. Namely, grain boundary sources for dislocations, with the aim of providing a different model for the Hall-Petch relation without the need of dislocation pile-ups at grain boundaries, or Frank-Read sources inside the grain. This article provides a review of his model, and supporting evidence for grain boundaries or interfacial sources of dislocations, including direct observations using transmission electron microscopy. The Li model has acquired new interest with the recent development of nanomaterial and multilayers. It is now known that nanocrystalline metals/alloys show a behavior different from conventional polycrystalline materials. The role of grain boundary sources in nanomaterials is reviewed briefly. |
| Databáze: | OpenAIRE |
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