Direct measurement of vacancy relaxation by dilatometry

Research output: Contribution to journalArticleResearchpeer-review

Authors

  • Jaromir A. Kotzurek
  • Eva-Maria Steyskal
  • Bernd Oberdorfer
  • Reinhard Pippan
  • Wolfgang Sprengel
  • Roland Würschum

External Organisational units

  • Technische Universität Graz
  • Erich Schmid Institute of Materials Science

Abstract

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.

Details

Original languageEnglish
Article number021906
Number of pages5
JournalApplied physics letters
Volume109.2016
Issue number2
DOIs
Publication statusPublished - 14 Jul 2016