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Absolute concentration of free volume-type defects in ultrafine-grained Fe prepared by high-pressure torsion
A maximum excess volume ΔV/V ≈ 1.9 × 10(−3) in ultrafine-grained Fe prepared by high-pressure torsion is determined by measurements of the irreversible length change upon annealing employing a high-resolution differential dilatometer. Since dislocations and equilibrium-type grain boundaries cannot f...
| Autores principales: | , , , , , , |
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| Formato: | Online Artículo Texto |
| Lenguaje: | English |
| Publicado: |
Pergamon
2010
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| Materias: | |
| Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3140641/ https://www.ncbi.nlm.nih.gov/pubmed/21785571 http://dx.doi.org/10.1016/j.scriptamat.2010.05.007 |
| Sumario: | A maximum excess volume ΔV/V ≈ 1.9 × 10(−3) in ultrafine-grained Fe prepared by high-pressure torsion is determined by measurements of the irreversible length change upon annealing employing a high-resolution differential dilatometer. Since dislocations and equilibrium-type grain boundaries cannot fully account for the observed released excess volume, the present study yields evidence for a high concentration of free volume-type defects inherent to nanophase materials, which is considered to be the main source of their particular properties, such as strongly enhanced diffusivities. |
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