Direct measurement of vacancy relaxation by dilatometry

Jaromir Kotzurek, Eva-Maria Steyskal, Bernd Oberdorfer, Anton Hohenwarter, Reinhard Pippan, Wolfgang Sprengel, Roland Würschum*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A model is proposed for directly determining the volume of lattice vacancies by means of dilatometric measurements of the anisotropic irreversible length change which occurs during annealing of lattice vacancies at grain boundaries of shape-anisotropic crystallites. The model is tested using nanocrystalline Ni after the high-pressure torsion deformation which exhibits excess concentration of lattice vacancies and elongated crystallite shape. Different length changes upon annealing parallel and perpendicular to the elongation axis occur from which a vacancy volume can be derived.
This work was financially supported by the Austrian Science Fund (FWF): P25628-N20.
Original languageEnglish
Article number021906
Number of pages4
JournalApplied Physics Letters
Issue number2
Publication statusPublished - 2016

Fields of Expertise

  • Advanced Materials Science


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