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Direct measurement of vacancy relaxation by dilatometry
H. J. Wollenberger, “ Point defects,” in Physical Metallurgy, 4th ed., edited by R. W. Cahn and P. Haasen ( North-Holland Publishing Company, 1996), Chap. 18, Vol. 2, p. 1621.
B. Oberdorfer, E.-M. Steyskal, W. Sprengel, W. Puff, P. Pikart, C. Hugenschmidt, M. Zehetbauer, R. Pippan, and R. Würschum, Phys. Rev. Lett. 105, 146101 (2010).
J. Keckes, private communication (2016).
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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.
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