| Autor: |
Gryaznov, V. G., Tanakov, M. Yu., Trusov, L. I. |
| Zdroj: |
Journal of Materials Science; September 1992, Vol. 27 Issue: 18 p4829-4841, 13p |
| Abstrakt: |
The atomic structure of interparticle contact interfaces which present a new type of interface, is reviewed. Such interfaces show long-range elastic stress fields and a marked tendency to reconstruct themselves into more equilibrium structures similar to conventional grain boundaries. The methods of reconstruction (ageing) of the interfaces are analysed in detail. The elastically stressed state in the volume of nanoparticles which have few contacts with neighbouring particles in the ensemble, is investigated. Plasticity and mass-transfer processes leading to the relaxation of these contact stresses are considered. The mechanisms of generation of dislocations and critical pressures of compaction are discussed in detail. Stress-stimulated diffusion initiated by contact pressures is compared with the traditional mass-transfer caused by surface tension during the sintering of conventional coarse-grained powders. |
| Databáze: |
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