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Absolute concentration of free volume-type defects in ultrafine-grained Fe prepared by high-pressure torsion.
MedLine Citation:
PMID:  21785571     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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.
Authors:
Bernd Oberdorfer; Bernd Lorenzoni; Katrin Unger; Wolfgang Sprengel; Michael Zehetbauer; Reinhard Pippan; Roland Würschum
Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Scripta materialia     Volume:  63     ISSN:  1359-6462     ISO Abbreviation:  -     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2011-7-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101322196     Medline TA:  Scr Mater     Country:  -    
Other Details:
Languages:  ENG     Pagination:  452-455     Citation Subset:  -    
Affiliation:
Institut für Materialphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria.
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