Journal of Materials Science

, Volume 47, Issue 22, pp 7921–7925 | Cite as

Dilatometry: a powerful tool for the study of defects in ultrafine-grained metals

  • W. Sprengel
  • B. Oberdorfer
  • E.-M. Steyskal
  • R. Würschum
Ultrafine Grained Materials


Vacancies, dislocations, and interfaces are structural defects that are deliberately introduced into solids during grain refinement processes based on severe plastic deformation (SPD). Specific combinations of these defects determine the improved mechanical properties of the obtained ultrafine-grained materials. High-precision, non-equilibrium dilatometry, i.e., measurement of the irreversible macroscopic length change upon defect annealing, provides a powerful technique for the characterization and the study of the kinetics of these defects. It is applied to determine absolute concentrations of vacancies, to characterize dislocation processes, and to assess grain boundary excess volume in pure, FCC and BCC ultrafine-grained metals processed by SPD.


Severe Plastic Deformation Length Change Bulk Metallic Glass Dilatometry Linear Thermal Expansion 



Financial support by Austrian Science Fund (FWF): P21009-N20 is appreciated.


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • W. Sprengel
    • 1
  • B. Oberdorfer
    • 1
  • E.-M. Steyskal
    • 1
  • R. Würschum
    • 1
  1. 1.Institute of Materials PhysicsGraz University of TechnologyGrazAustria

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