Direct measurement of vacancy relaxation by dilatometry

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

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

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