Kinetics of vacancy annealing upon time-linear heating applied to dilatometry

R. Enzinger, C. Neubauer, J. Kotzurek, W. Sprengel, R. Würschum*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A kinetic model for the diffusion-controlled annealing of excess vacancies under the experimentally relevant, non-isothermal condition of time-linear heating is presented and applied to dilatometry. The evolution of the vacancy concentration with time is quantitatively analyzed, considering as ideal sinks either dislocations or grain boundaries of spherical- or cylindrical-shaped crystallites. The validity of the model is tested using dilatometry data that were obtained for ultrafine-grained Ni prepared by high-pressure torsion. The entire two-stage annealing curve of the dilatometric length change can be analyzed by combining the present kinetic model of vacancy annealing at grain boundaries with established non-isothermal kinetics of recrystallization.

Original languageEnglish
Pages (from-to)2758-2765
JournalJournal of Materials Science
Publication statusPublished - 2018

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

Fields of Expertise

  • Advanced Materials Science


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