Absolute concentration of free volume-type defects in ultrafine-grained Fe prepared by high-pressure torsion

Autor(en)

Bernd Oberdorfer, Bernd Lorenzoni, Katrin Unger, Wolfgang Sprengel, Michael Zehetbauer, Reinhard Pippan, Roland Würschum

Abstrakt

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(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Technische Universität Graz, Österreichische Akademie der Wissenschaften (ÖAW)

Journal

Scripta Materialia

Band

63

Seiten

452-455

Anzahl der Seiten

4

ISSN

1359-6462

DOI

https://doi.org/10.1016/j.scriptamat.2010.05.007

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/6d06bea3-7d95-4490-b50b-008ce45a05d4