2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 5. Marquis Intl. Symp. / New and Advanced Materials and Technologies
| Editors: | Kongoli F, Marquis F, Chikhradze N |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2017 |
| Pages: | 590 pages |
| ISBN: | 978-1-987820-69-0 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Interfaces in Nanomaterials
Katerina Aifantis1;1UNIV OF FLORIDA, Gainesville, United States;
Type of Paper: Keynote
Id Paper: 372
Topic: 43
Abstract:
The optoelectronic and mechanical properties at the nanoscale can differ drastically than those at the microscale. This is attributed to the large surface to volume ratio that characterizes nanomaterials. In the present talk it will be illustrated that introducing new interface energy terms, in the materials constitutive equations, can allow the interpretation of the experimental stress-strain response observed for nanopillars, micropillars and nanocrystals, which classical mechanics cannot capture. The materials systems to be examined are bi and tri-crystalline Fe-Si alloys, in which nanoindentation is performed near the vicinity of the grain boundary. Furthermore, the behaviour of nanopolycrystalline materials, such as Cu, W, Ni, which exhibit the inverse Hall-Petch transition can also be captured through consideration of such new interface energy terms. The nano indentation results are compared with atomistic simulations and dislocation dynamics to obtain a physical interpretation for the interface energy terms.