Absolute concentration of free volume-type defects in ultrafine-grained Fe prepared by high-pressure torsion
- Author(s)
- Bernd Oberdorfer, Bernd Lorenzoni, Katrin Unger, Wolfgang Sprengel, Michael Zehetbauer, Reinhard Pippan, Roland Würschum
- Abstract
A maximum excess volume Delta V/V approximate to 1.9 x 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.
- Organisation(s)
- Physics of Nanostructured Materials
- External organisation(s)
- Technische Universität Graz, Österreichische Akademie der Wissenschaften (ÖAW)
- Journal
- Scripta Materialia
- Volume
- 63
- Pages
- 452-455
- No. of pages
- 4
- ISSN
- 1359-6462
- DOI
- https://doi.org/10.1016/j.scriptamat.2010.05.007
- Publication date
- 2010
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 1030 Physics, Astronomy
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/absolute-concentration-of-free-volumetype-defects-in-ultrafinegrained-fe-prepared-by-highpressure-torsion(6d06bea3-7d95-4490-b50b-008ce45a05d4).html