Dominant mechanisms of the sintering of copper nano-powders depending on the crystal misalignment
| Autor: | Yujin Seong, Sungho Kim, Seong-Gon Kim, Hak Jun Kim, See Jo Kim, Youngkyu Kim, Seong Jin Park, Randall M. German |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science General Computer Science Metallurgy General Physics and Astronomy Sintering 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology 01 natural sciences Crystal Computational Mathematics Molecular dynamics Mechanics of Materials Condensed Matter::Superconductivity 0103 physical sciences Nano Effective diffusion coefficient Grain boundary diffusion coefficient General Materials Science Grain boundary Diffusion (business) Composite material 0210 nano-technology |
| Zdroj: | Computational Materials Science. 123:164-175 |
| ISSN: | 0927-0256 |
| Popis: | Sintering mechanisms of nanoscale copper powder are investigated using molecular dynamics (MD) simulations based on the embedded-atom method (EAM). The densification parameters, such as shrinkage, and relative sintered density are calculated using the two-particle sintering model. This paper considers the important role of crystalline misalignment between two particles on densification. Besides volume diffusion contribution, misalignment between the crystal structures results in enhanced grain boundary diffusion. At low temperatures, grain boundary torque cause particles to rotate to reduce grain boundary energy. At higher temperatures, particle rotation becomes complicated including remarkable twist, and grain boundary tilting due to grain-boundary-like diffusion. These results provide insights to the processing cycle parameters applicable to nano-powders. |
| Databáze: | OpenAIRE |
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